Carbide Threading tool

ET-PN
EDT-TH
EDT- (N )PT-ATH
Carbide Thread Mill series

N e w P ro d u c t N e w s No. H1803A-1 2018-9

 Features
Applications
ET-PN
Applicable range EDT-TH, EDT-(N)PT-ATH
Cast iron Carbon steel Tool steel Pre-hardened Hardened steel Hardened steel φ1.4mm～φ15.8mm,
Alloy steep steel 45~55HRC 55~66HRC
Mold making Parts processing φ.055”～φ.622”［ 140 Sizes ］

Features of Epoch Thread Mill

・Tough and strong edge design provides threading in hardened steels.

・Tip shape reduces cutting resistance suppresses tool bending.
・Drastically reduces tool breakage.
・PN Coating provides excellent adhesion Reduces risk
and wear resistance. of breaking
off inside!

New coating with excellent adhesion and wear resistance

Adhesion of PN coating Substrate: Carbide alloy
Cross-section photograph of PN coating
layer structure
Conventional coating PN coating Improved adhesion
increases stability!
Layer surface
No peeling with improved
↓ lubrication
Superior characteristics.
adhesion

Coating is peeling. Microstructure increases heat resistance!

Features of Epoch D Thread Mill

・No pilot hole needed. This single tool can perform both drilling and threading simultaneously.
・High-strength edge shape design suppresses edge
tip breakage in severe machining environments
including hardened steels. No pilot hole
・ATH Coating delivers improved hardness and
oxidation resistance.
needed

ATH coating further improves the hardness and

oxidation resistance of the previous TH coating.
●Hardness and oxidation resistance of TH coatings is further improved.
Enables longer life and higher efficiency when cutting high-hardness
Epoch materials.
Super Coating Hardness: 3800HV; Oxidation temperature: 1200℃
(Si nano composite coating with finer crystal particles)
●Exhibits performance in ultra high-efficient cutting.
02
 Reduces the risk of breaking off inside
By using a tool with a diameter smaller than the inside diameter of the thread, cutting chips are smaller and
chip evacuation is improved.
The risk of the tool breaking off inside the hole is reduced as a result.

One tool - various types of thread milling

Right hand, left-hand and fine thread milling can be performed by just changing the NC program.
The thread diameters of the coarse threads and fine threads that can be processed with the same tool are different.
(Example: For ET-1.25-16-PN, coarse thread is M8 × P1.25 and fine thread is M10 × P1.25)

Cutting conditions can be freely set

Unlike when using taps, synchronizing the rotation and feed rates is not necessary,
so these tools can be used in the same manner as end mills and cutting conditions
can be set according to the processing environment.

Usable on a variety of machines

Since the load is smaller than when using taps, these tools can be used even on
machines having low-powered spindle.
In addition, special tooling such as tapping holders are not necessary.

Provides good finished surfaces

Interrupted cutting suppresses gouging to provide good finished surfaces.

Thread milling can be performed to the bottom of the hole.

Epoch Thread Mills are designed with no incomplete threads and Epoch D Thread
Mills have only one incomplete thread, making them ideal for when you want to
perform thread milling to the bottom of shallow holes.

Machining process with Epoch Thread Mill

1Startup
2Positioning for starting point
of machining
3Entry (gradually cutting in)
4Threading
5Release
(gradually detaching from cutting)
6Ending

※Epoch D Thread Mill can perform boring

simultaneously.
1 2 3 4 5 6

You can create NC programs on our website!

Easily Create NC Programs Online http://www.mmc-hitachitool.co.jp/en-US/
Left-hand cutting tool - Reverse spindle rotation should be used.
03
 Line up
Epoch Thread Mill
Left-hand
edge

DC DCON

LN
4 flutes No incomplete LF
thread

ET-(U) . - . -PN Unit Metric Screw : mm, UN Screw Thread : inch

Carbide
Coated

Order Number Stock Thread Dia. Thread Pitch Cutting Dia. Neck Length Functional Length Connection Dia. Oil
TD TP DC LN LF DCON Hole
ET-U64-3.7-PN ★ No.1-64UNC .073 64 .0551 .1457 1.969 .2362 -
UN Screw Thread ET-U56-4.4-PN ★ No.2-56UNC .086 56 .065 .1732 1.969 .2362 -
ET-U48-5-PN ★ No.3-48UNC .099 48 .0748 .1969 1.969 .2362 -
DC × 2 ET-U40-5.7-PN ★ No.4-40UNC .112 40 .0827 .2244 1.969 .2362 -
ET-U32-7-PN ★ No.6-32UNC .138 32 .1004 .2756 1.969 .2362 -
ET-U36-8.3-PN ★ No.8-36UNF .164 36 .1299 .3268 1.969 .2362 -
ET-U24-9.7-PN ★ No.10-24UNC .19 24 .1378 .3819 2.756 .2362 -
ET-U20-12.7-PN ● ¼-20UNC 1/4 20 .187 .5 2.756 .2362 -
ET-U28-12.7-PN ● ¼-28UNF 1/4 28 .1969 .5 2.756 .2362 -
ET-U18-15.9-PN ● ⁵⁄₁₆-18UNC 5/16 18 .2362 .626 3.15 .3937 -
ET-U16-19.1-PN ● ⅜-16UNC 3/8 16 .2638 .752 3.15 .3937 -
ET-U14-22.2-PN ★ ⁷⁄₁₆-14UNC 7/16 14 .3031 .874 3.15 .3937 -
ET-U13-25.4-PN ● ½-13UNC 1/2 13 .3622 1.0 3.15 .3937 -
ET-U12-28.6-PN ★ ⁹⁄₁₆-12UNC 9/16 12 .4134 1.126 3.937 .4724 -
ET-U11-31.8-PN ● ⅝-11UNC 5/8 11 .4488 1.252 3.937 .4724 -
ET-U64-4.6-PN ★ No.1-64UNC .073 64 .0551 .1811 1.969 .2362 -
UN Screw Thread ET-U56-5.5-PN ★ No.2-56UNC .086 56 .065 .2165 1.969 .2362 -
ET-U48-6.3-PN ★ No.3-48UNC .099 48 .0748 .248 1.969 .2362 -
DC × 2.5 ET-U40-7.1-PN ★ No.4-40UNC .112 40 .0827 .2795 1.969 .2362 -
ET-U32-8.8-PN ★ No.6-32UNC .138 32 .1004 .3465 1.969 .2362 -
ET-U36-10.4-PN ★ No.8-36UNF .164 36 .1299 .4094 1.969 .2362 -
ET-U24-12.1-PN ★ No.10-24UNC .19 24 .1378 .4764 2.756 .2362 -
ET-U20-15.9-PN ● ¼-20UNC 1/4 20 .187 .626 2.756 .2362 -
ET-U28-15.9-PN ● ¼-28UNF 1/4 28 .1969 .626 2.756 .2362 -
ET-U18-19.8-PN ● ⁵⁄₁₆-18UNC 5/16 18 .2362 .7795 3.15 .3937 -
ET-U16-23.8-PN ● ⅜-16UNC 3/8 16 .2638 .937 3.15 .3937 -
ET-U14-27.8-PN ★ ⁷⁄₁₆-14UNC 7/16 14 .3031 1.0945 3.15 .3937 -
ET-U13-31.8-PN ● ½-13UNC 1/2 13 .3622 1.252 3.15 .3937 -
ET-U12-35.7-PN ★ ⁹⁄₁₆-12UNC 9/16 12 .4134 1.4055 3.937 .4724 -
ET-U11-39.7-PN ● ⅝-11UNC 5/8 11 .4488 1.563 3.937 .4724 -
ET-0.4-4-PN ★ M2 0.4 1.4 4 50 6 -
ET-0.45-4.4-PN ★ M2.2 0.45 1.6 4.4 50 6 -
Metric Screw
ET-0.45-5-PN ★ M2.5 0.45 1.8 5 50 6 -
DC × 2 ET-0.5-6-PN ● M3 0.5 2.4 6 50 6 -
ET-0.7-8-PN ● M4 0.7 3.1 8 50 6 -
ET-0.8-10-PN ● M5 0.8 3.8 10 50 6 -
ET-1.0-12-PN ● M6 1 4.6 12 50 6 -
ET-1.25-16-PN ● M8 1.25 6.2 16 70 10 -
ET-1.5-20-PN ● M10 1.5 7.5 20 70 10 -
ET-1.75-24-PN ● M12 1.75 9 24 80 10 -
ET-2-32-PN ★ M16 2 11.5 32 100 12 -
ET-2.5-36-PN ★ M18 2.5 14 36 135 16 ○
ET-2.5-40-PN ★ M20 2.5 15 40 135 16 ○
ET-0.4-5-PN ★ M2 0.4 1.4 5 50 6 -
ET-0.45-5.5-PN ★ M2.2 0.45 1.6 5.5 50 6 -
Metric Screw
ET-0.45-6.25-PN ★ M2.5 0.45 1.8 6.25 50 6 -
DC × 2.5 ET-0.5-7.5-PN ● M3 0.5 2.4 7.5 50 6 -
ET-0.7-10-PN ● M4 0.7 3.1 10 50 6 -
ET-0.8-12.5-PN ● M5 0.8 3.8 12.5 50 6 -
ET-1.0-15-PN ● M6 1 4.6 15 50 6 -
ET-1.25-20-PN ● M8 1.25 6.2 20 70 10 -
ET-1.5-25-PN ● M10 1.5 7.5 25 70 10 -
ET-1.75-30-PN ● M12 1.75 9 30 80 10 -
ET-2-40-PN ★ M16 2 11.5 40 100 12 -
ET-2.5-45-PN ★ M18 2.5 14 45 135 16 ○
ET-2.5-50-PN ★ M20 2.5 15 50 135 16 ○
●： Inventory maintained in US ★：Inventory maintained in Japan ※For information about tool diameter correction,
refer to the item in "Cautions on use" on p. 19.
04
Recommended Cutting Conditions
Epoch Thread Mill

UN Screw Thread
Cast Iron, Carbon Steels Stainless Steels Tool Steels Pre-hardened Steels
Work Material
150～200HB 300 series 25 ～ 35HRC 35 ～ 45HRC
vc (sfm) 262 ～ 279 ～ 295 230 ～ 246 ～ 262 197 ～ 213 ～ 230
Thread Dia. DC RPM Feed Rate vf Feed/Tooth fz RPM Feed Rate vf Feed/Tooth fz RPM Feed Rate vf Feed/Tooth fz
TD (in) (min-1) (in/min) (in/t) (min-1) (in/min) (in/t) (min-1) (in/min) (in/t)
No.1-64UNC .0551 19,300 6.69 .00035 17,100 5.28 .00031 14,800 4.57 .00031
No.2-56UNC .065 16,400 6.93 .00043 14,500 6.14 .00043 12,500 4.8 .00039
No.3-48UNC .0748 14,200 7.13 .00051 12,600 5.83 .00047 10,900 4.61 .00043
No.4-40UNC .0827 12,900 7.99 .00059 11,400 6.57 .00055 9,900 5.31 .00051
No.6-32UNC .1004 10,600 8.19 .00071 9,400 6.85 .00067 8,100 5.55 .00063
No.8-36UNF .1299 8,200 6.69 .00098 7,200 5.67 .00094 6,300 4.53 .00087
No.10-24UNC .1378 7,700 8.98 .00106 6,800 7.36 .00098 5,900 5.87 .00091
¼-20UNC .187 5,700 8.58 .0015 5,000 7.13 .00142 4,400 5.75 .0013
¼-28UNF .1969 5,400 7.24 .00157 4,800 6.1 .0015 4,100 4.8 .00138
⁵⁄₁₆-18UNC .2362 4,500 8.31 .00189 4,000 6.93 .00177 3,400 5.47 .00165
⅜-16UNC .2638 4,000 10.08 .00213 3,600 8.43 .00197 3,100 6.81 .00185
⁷⁄₁₆-14UNC .3031 3,500 10.51 .00244 3,100 8.7 .00228 2,700 7.05 .00213
½-13UNC .3622 2,900 9.33 .00291 2,600 7.8 .00272 2,200 6.1 .00252
⁹⁄₁₆-12UNC .4134 2,600 8.7 .00315 2,300 7.2 .00295 2,000 5.83 .00276
⅝-11UNC .4488 2,400 9.25 .00343 2,100 7.56 .00319 1,800 6.06 .00299

Hardened Steels Hardened Steels Hardened Steels

Work Material
45 ～ 55HRC 55 ～ 62HRC 62 ～ 66HRC
vc (sfm) 164 ～ 180 ～ 197 131 ～ 148 ～ 164 98 ～ 115 ～ 131
Thread Dia. DC RPM Feed Rate vf Feed/Tooth fz RPM Feed Rate vf Feed/Tooth fz RPM Feed Rate vf Feed/Tooth fz
TD (in) (min-1) (in/min) (in/t) (min-1) (in/min) (in/t) (min-1) (in/min) (in/t)
No.1-64UNC .0551 12,500 3.39 .00028 10,200 2.36 .00024 8,000 1.85 .00024
No.2-56UNC .065 10,600 3.66 .00035 8,700 2.36 .00028 6,800 1.85 .00028
No.3-48UNC .0748 9,200 3.54 .00039 7,500 2.32 .00031 5,900 1.81 .00031
No.4-40UNC .0827 8,300 4.09 .00047 6,800 2.52 .00035 5,300 1.97 .00035
No.6-32UNC .1004 6,900 4.45 .00059 5,600 2.64 .00043 4,400 2.09 .00043
No.8-36UNF .1299 5,300 3.46 .00079 4,300 2.24 .00063 3,400 1.77 .00063
No.10-24UNC .1378 5,000 4.76 .00087 4,100 3.03 .00067 3,200 2.36 .00067
¼-20UNC .187 3,700 4.57 .00122 3,000 2.87 .00094 2,300 2.2 .00094
¼-28UNF .1969 3,500 3.86 .0013 2,900 2.44 .00098 2,200 1.85 .00098
⁵⁄₁₆-18UNC .2362 2,900 4.33 .00154 2,400 2.76 .00118 1,900 2.2 .00118
⅜-16UNC .2638 2,600 5.35 .00173 2,100 3.35 .00134 1,700 2.72 .00134
⁷⁄₁₆-14UNC .3031 2,300 5.55 .00197 1,900 3.58 .00154 1,400 2.64 .00154
½-13UNC .3622 1,900 4.96 .00236 1,600 3.19 .00181 1,200 2.4 .00181
⁹⁄₁₆-12UNC .4134 1,700 4.61 .00256 1,400 2.91 .00197 1,100 2.28 .00197
⅝-11UNC .4488 1,500 4.65 .00276 1,300 3.11 .00213 1,000 2.4 .00213

【Note】
①ET thread mills are only for threading the inside of holes.
②The above cutting conditions are for the thread diameters stated in the table. Cutting conditions for other thread diameters should be
calculated taking into consideration the Cutting Considerations (page 19).
③The machinery should be a machining center equipped with NC (numerical control) equipment having a helical interpolation function.
④The feed rate stated in the above conditions table is the feed rate at the tool center during tapping. In addition, the per-tooth feed rate is the
numerical value at the cutting point.
⑤Since there is a risk of cutting chips getting inside the machine, when using tools equipped with oil holes, be sure to use the oil holes.
⑥Use the appropriate coolant for the work material and machining shape.
⑦These conditions are for general guidance; in actual machining conditions adjust the parameters according to your actual machine conditions.

05
 Recommended Cutting Conditions
Epoch Thread Mill

Metric Screw
Cast Iron, Carbon Steels Stainless Steels Tool Steels Pre-hardened Steels
Work Material
150～200HB 300 series 25 ～ 35HRC 35 ～ 45HRC
vc (m/min) 80 ～ 85 ～ 90 70 ～ 75 ～ 80 60 ～ 65 ～ 70
Thread Dia. DC RPM Feed Rate vf Feed/Tooth fz RPM Feed Rate vf Feed/Tooth fz RPM Feed Rate vf Feed/Tooth fz
TD (mm) (min-1) (mm/min) (mm/t) (min-1) (mm/min) (mm/t) (min-1) (mm/min) (mm/t)
M2 1.4 19,300 208 0.009 17,100 164 0.008 14,800 142 0.008
M2.2 1.6 16,900 203 0.011 14,900 163 0.01 12,900 141 0.01
M2.5 1.8 15,000 202 0.012 13,300 164 0.011 11,500 142 0.011
M3 2.4 11,300 154 0.017 9,900 127 0.016 8,600 103 0.015
M4 3.1 8,700 188 0.024 7,700 152 0.022 6,700 127 0.021
M5 3.8 7,100 198 0.029 6,300 163 0.027 5,400 130 0.025
M6 4.6 5,900 204 0.037 5,200 170 0.035 4,500 134 0.032
M8 6.2 4,400 198 0.05 3,900 165 0.047 3,300 128 0.043
M10 7.5 3,600 216 0.06 3,200 179 0.056 2,800 148 0.053
M12 9 3,000 216 0.072 2,700 184 0.068 2,300 145 0.063
M16 11.5 2,400 235 0.087 2,100 194 0.082 1,800 154 0.076
M18 14 1,900 171 0.101 1,700 144 0.095 1,500 117 0.088
M20 15 1,800 184 0.102 1,600 154 0.096 1,400 125 0.089

Hardened Steels Hardened Steels Hardened Steels

Work Material
45 ～ 55HRC 55 ～ 62HRC 62 ～ 66HRC
vc (m/min) 50 ～ 55 ～ 60 40 ～ 45 ～ 50 30 ～ 35 ～ 40
Thread Dia. DC RPM Feed Rate vf Feed/Tooth fz RPM Feed Rate vf Feed/Tooth fz RPM Feed Rate vf Feed/Tooth fz
TD (mm) (min-1) (mm/min) (mm/t) (min-1) (mm/min) (mm/t) (min-1) (mm/min) (mm/t)
M2 1.4 12,500 105 0.007 10,200 73 0.006 8,000 58 0.006
M2.2 1.6 10,900 107 0.009 9,000 69 0.007 7,000 53 0.007
M2.5 1.8 9,700 109 0.01 8,000 72 0.008 6,200 56 0.008
M3 2.4 7,300 82 0.014 6,000 53 0.011 4,600 40 0.011
M4 3.1 5,600 96 0.019 4,600 62 0.015 3,600 49 0.015
M5 3.8 4,600 102 0.023 3,800 66 0.018 2,900 50 0.018
M6 4.6 3,800 106 0.03 3,100 67 0.023 2,400 52 0.023
M8 6.2 2,800 101 0.04 2,300 64 0.031 1,800 50 0.031
M10 7.5 2,300 113 0.049 1,900 72 0.038 1,500 57 0.038
M12 9 1,900 112 0.059 1,600 72 0.045 1,200 54 0.045
M16 11.5 1,500 120 0.071 1,200 74 0.055 1,000 62 0.055
M18 14 1,300 95 0.082 1,000 56 0.063 800 45 0.063
M20 15 1,200 100 0.083 1,000 64 0.064 700 45 0.064

【Note】
①ET thread mills are only for threading the inside of holes.
②The above cutting conditions are for the thread diameters stated in the table. Cutting conditions for other thread diameters should be
calculated taking into consideration the Cutting Considerations (page 19).
③The machinery should be a machining center equipped with NC (numerical control) equipment having a helical interpolation function.
④The feed rate stated in the above conditions table is the feed rate at the tool center during tapping. In addition, the per-tooth feed rate is the
numerical value at the cutting point.
⑤Since there is a risk of cutting chips getting inside the machine, when using tools equipped with oil holes, be sure to use the oil holes.
⑥Use the appropriate coolant for the work material and machining shape.
⑦These conditions are for general guidance; in actual machining conditions adjust the parameters according to your actual machine conditions.

06
Line up
Epoch Thread Mill
Left-hand
edge

DC DCON

LN
LF
4 flutes 1 incomplete thread and
2 complete threads

EDT-U - . -TH Unit inch

Carbide
Coated

Thread Thread Cutting Neck Functional Connection Oil

Order Number Stock Thread Dia. Dia. Pitch Dia. Length Length Dia. Hole
TD TP DC LN LF DCON
EDT-U64-3.7-TH ★ No.1-64UNC .073 64 .0551 .1457 1.969 .2362 -
UN Screw Thread EDT-U56-4.4-TH ★ No.2-56UNC .086 56 .065 .1732 1.969 .2362 -
EDT-U48-5-TH ★ No.3-48UNC .099 48 .0748 .1969 1.969 .2362 -
DC × 2
EDT-U40-5.7-TH ★ No.4-40UNC .112 40 .0827 .2244 1.969 .2362 -
EDT-U32-7-TH ★ No.6-32UNC .138 32 .1004 .2756 1.969 .2362 -
EDT-U32-8.3-TH ● NO.8-32UNF .164 32 .1299 .3268 2.362 .2362 -
EDT-U36-8.3-TH ★ No.8-36UNF .164 36 .1299 .3268 1.969 .2362 -
EDT-U32-9.7-TH ● NO.10-32UNF .19 32 .1378 .3819 2.362 .2362 -
EDT-U24-9.7-TH ★ No.10-24UNC .19 24 .1378 .3819 2.756 .2362 -
EDT-U20-12.7-TH ● ¼-20UNC 1/4 20 .187 .5 2.756 .2362 -
EDT-U28-12.7-TH ● ¼-28UNF 1/4 28 .1969 .5 2.756 .2362 -
EDT-U18-15.9-TH ● ⁵⁄₁₆-18UNC 5/16 18 .2362 .626 3.15 .3937 -
EDT-U24-15.9-TH ● ⁵⁄₁₆-24UNF 5/16 24 .2362 .626 3.15 .3937 -
EDT-U16-19.1-TH ● ⅜-16UNC 3/8 16 .2638 .752 3.15 .3937 -
EDT-U14-22.2-TH ★ ⁷⁄₁₆-14UNC 7/16 14 .3031 .874 3.15 .3937 ○
EDT-U13-25.4-TH ● ½-13UNC 1/2 13 .3622 1.0 3.15 .3937 ○
EDT-U20-25.4-TH ● ½-20UNF 1/2 20 .3622 1.0 3.15 .3937 ○
EDT-U12-28.6-TH ★ ⁹⁄₁₆-12UNC 9/16 12 .4134 1.126 3.937 .4724 ○
EDT-U11-31.8-TH ● ⅝-11UNC 5/8 11 .4488 1.252 3.937 .4724 ○
EDT-U18-31.8-TH ● ⅝-18UNF 5/8 18 .4488 1.252 3.937 .4724 ○
EDT-U10-3/4-38.1-TH ● ¾-10UNC 3/4 10 .5709 1.5 5.315 .6299 ○
EDT-U9-7/8-44.5-TH ● ⅞-9UNC 7/8 9 .5906 1.752 5.315 .6299 ○
EDT-U8-1-50.8-TH ● 1-8UNC 1 8 .622 2.0 5.315 .6299 ○
EDT-U64-4.6-TH ★ No.1-64UNC .073 64 .0551 .1811 1.969 .2362 -
UN Screw Thread EDT-U56-5.5-TH ★ No.2-56UNC .086 56 .065 .2165 1.969 .2362 -
EDT-U48-6.3-TH ★ No.3-48UNC .099 48 .0748 .248 1.969 .2362 -
DC × 2.5
EDT-U40-7.1-TH ★ No.4-40UNC .112 40 .0827 .2795 1.969 .2362 -
EDT-U32-8.8-TH ★ No.6-32UNC .138 32 .1004 .3465 1.969 .2362 -
EDT-U32-10.4-TH ● NO.8-32UNF .164 32 .1299 .4094 2.362 .2362 -
EDT-U36-10.4-TH ★ No.8-36UNF .164 36 .1299 .4094 1.969 .2362 -
EDT-U24-12.1-TH ★ No.10-24UNC .19 32 .1378 .4764 2.756 .2362 -
EDT-U32-12.1-TH ● No.10-32UNF .19 24 .1378 .4764 2.362 .2362 -
EDT-U20-15.9-TH ● ¼-20UNC 1/4 20 .187 .626 2.756 .2362 -
EDT-U28-15.9-TH ● ¼-28UNF 1/4 28 .1969 .626 2.756 .2362 -
EDT-U18-19.8-TH ● ⁵⁄₁₆-18UNC 5/16 18 .2362 .7795 3.15 .3937 -
EDT-U24-19.8-TH ● ⁵⁄₁₆-24UNF 5/16 24 .2362 .7795 3.15 .3937 -
EDT-U16-23.8-TH ● ⅜-16UNC 3/8 16 .2638 .937 3.15 .3937 -
EDT-U14-27.8-TH ★ ⁷⁄₁₆-14UNC 7/16 14 .3031 1.0945 3.15 .3937 ○
EDT-U13-31.8-TH ● ½-13UNC 1/2 13 .3622 1.252 3.15 .3937 ○
EDT-U20-31.8-TH ● ½-20UNF 1/2 20 .3622 1.252 3.15 .3937 ○
EDT-U12-35.7-TH ★ ⁹⁄₁₆-12UNC 9/16 12 .4134 1.4055 3.937 .4724 ○
EDT-U11-39.7-TH ● ⅝-11UNC 5/8 11 .4488 1.563 3.937 .4724 ○
EDT-U18-39.7-TH ● ⅝-18UNF 5/8 18 .4488 1.563 3.937 .4724 ○
EDT-U10-3/4-47.6-TH ● ¾-10UNC 3/4 10 .5709 1.874 5.315 .6299 ○
EDT-U9-7/8-55.6-TH ● ⅞-9UNC 7/8 9 .5906 2.189 5.315 .6299 ○
EDT-U8-1-63.5-TH ● 1-8UNC 1 8 .622 2.5 5.315 .6299 ○
●： Inventory maintained in US ★：Inventory maintained in Japan ※For information about tool diameter correction,
refer to the item in "Cautions on use" on p. 19.

07
 Line up
Epoch Thread Mill
Left-hand
edge

DC DCON

LN
LF
4 flutes 1 incomplete thread and
2 complete threads

EDT . - . -TH Unit mm

Carbide
Coated

Order Number Stock Thread Dia. Thread Pitch Cutting Dia. Neck Length Functional Length Connection Dia. Oil
TD TP DC LN LF DCON Hole
EDT-0.4-4-TH ★ M2 0.4 1.4 4 50 6 -
EDT-0.45-4.4-TH ★ M2.2 0.45 1.6 4.4 50 6 -
Metric Screw
EDT-0.45-5-TH ★ M2.5 0.45 1.8 5 50 6 -
DC × 2 EDT-0.5-6-TH ● M3 0.5 2.4 6 50 6 -
EDT-0.7-8-TH ● M4 0.7 3.1 8 50 6 -
EDT-0.8-10-TH ● M5 0.8 3.8 10 50 6 -
EDT-1.0-12-TH ● M6 1 4.6 12 50 6 -
EDT-1.25-16-TH ● M8 1.25 6.2 16 70 10 -
EDT-1.5-20-TH ● M10 1.5 7.5 20 70 10 ○
EDT-1.75-24-TH ● M12 1.75 9 24 80 10 ○
EDT-2-32-TH ★ M16 2 11.5 32 100 12 ○
EDT-2.5-36-TH ★ M18 2.5 14 36 135 16 ○
EDT-2.5-40-TH ★ M20 2.5 15 40 135 16 ○
EDT-0.4-5-TH ★ M2 0.4 1.4 5 50 6 -
EDT-0.45-5.5-TH ★ M2.2 0.45 1.6 5.5 50 6 -
Metric Screw
EDT-0.45-6.25-TH ★ M2.5 0.45 1.8 6.25 50 6 -
DC × 2.5 EDT-0.5-7.5-TH ● M3 0.5 2.4 7.5 50 6 -
EDT-0.7-10-TH ● M4 0.7 3.1 10 50 6 -
EDT-0.8-12.5-TH ● M5 0.8 3.8 12.5 50 6 -
EDT-1.0-15-TH ● M6 1 4.6 15 50 6 -
EDT-1.25-20-TH ● M8 1.25 6.2 20 70 10 -
EDT-1.5-25-TH ● M10 1.5 7.5 25 70 10 ○
EDT-1.75-30-TH ● M12 1.75 9 30 80 10 ○
EDT-2-40-TH ★ M16 2 11.5 40 100 12 ○
EDT-2.5-45-TH ★ M18 2.5 14 45 135 16 ○
EDT-2.5-50-TH ★ M20 2.5 15 50 135 16 ○
●： Inventory maintained in US ★：Inventory maintained in Japan ※For information about tool diameter correction,
refer to the item in "Cautions on use" on p. 19.

08
 Recommended Cutting Conditions
Epoch Thread Mill
UN Screw Thread
Cast Iron, Carbon Steels Tool Steels Pre-hardened Steels
Work Material
150～200HB 25 ～ 35HRC 35 ～ 45HRC
vc (sfm) 262 ～ 279 ～ 295 230 ～ 246 ～ 262 197 ～ 219 ～ 230
Thread Dia. DC RPM Feed Rate vf Feed/Tooth fz RPM Feed Rate vf Feed/Tooth fz RPM Feed Rate vf Feed/Tooth fz
TD (in) (min-1) (in/min) (in/t) (min-1) (in/min) (in/t) (min-1) (in/min) (in/t)
No.1-64UNC .0551 19,300 4.45 .0002 17,100 3.94 .0002 14,800 3.43 .0002
No.2-56UNC .065 16,400 4.41 .00028 14,500 3.9 .00028 12,500 3.39 .00028
No.3-48UNC .0748 14,200 4.37 .00031 12,600 3.9 .00031 10,900 3.35 .00031
No.4-40UNC .0827 12,900 4.8 .00035 11,400 4.21 .00035 9,900 3.66 .00035
No.6-32UNC .1004 10,600 5 .00043 9,400 4.45 .00043 8,100 3.82 .00043
No.8-32UNF .1299 8,200 4.29 .00063 7,200 3.78 .00063 6,300 3.31 .00063
No.8-36UNF .1299 8,200 4.29 .00063 7,200 3.78 .00063 6,300 3.31 .00063
No.10-32UNF .1378 7,700 5.67 .00067 6,800 5 .00067 5,900 4.33 .00067
No.10-24UNC .1378 7,700 5.67 .00067 6,800 5 .00067 5,900 4.33 .00067
¼-20UNC .187 5,700 5.43 .00094 5,000 4.76 .00094 4,400 4.17 .00094
¼-28UNF .1969 5,400 4.53 .00098 4,800 4.02 .00098 4,100 3.43 .00098
⁵⁄₁₆-18UNC .2362 4,500 5.2 .00118 4,000 4.61 .00118 3,400 3.94 .00118
⁵⁄₁₆-24UNF .2362 4,500 5.2 .00118 4,000 4.61 .00118 3,400 3.94 .00118
⅜-16UNC .2638 4,000 6.34 .00134 3,600 5.71 .00134 3,100 4.92 .00134
⁷⁄₁₆-14UNC .3031 3,500 6.61 .00154 3,100 5.83 .00154 2,700 5.08 .00154
½-13UNC .3622 2,900 5.79 .00181 2,600 5.2 .00181 2,200 4.41 .00181
½-20UNF .3622 2,900 5.79 .00181 2,600 5.2 .00181 2,200 4.41 .00181
⁹⁄₁₆-12UNC .4134 2,600 5.43 .00197 2,300 4.8 .00197 2,000 4.17 .00197
⅝-11UNC .4488 2,400 5.75 .00213 2,100 5.04 .00213 1,800 4.33 .00213
⅝-18UNF .4488 2,400 5.75 .00213 2,100 5.04 .00213 1,800 4.33 .00213
¾-10UNC .5709 1,900 4.45 .00244 1,600 3.74 .00244 1,400 3.27 .00244
⅞-9UNC .5906 1,800 5.91 .00252 1,600 5.24 .00252 1,400 4.61 .00252
1-8UNC .622 1,700 6.77 .00264 1,500 5.98 .00264 1,300 5.2 .00264

Hardened Steels Hardened Steels Hardened Steels Stainless Steels

Work Material
45 ～ 55HRC 55 ～ 62HRC 62 ～ 66HRC 300 series
vc (sfm) 164 ～ 180 ～ 197 131 ～ 148 ～ 164 98 ～ 115 ～ 131
Thread Dia. DC RPM Feed Rate vf Feed/Tooth fz RPM Feed Rate vf Feed/Tooth fz RPM Feed Rate vf Feed/Tooth fz
TD (in) (min-1) (in/min) (in/t) (min-1) (in/min) (in/t) (min-1) (in/min) (in/t)
No.1-64UNC .0551 12,500 2.87 .0002 10,200 2.36 .0002 8,000 1.85 .0002
No.2-56UNC .065 10,600 2.87 .0003 8,700 2.36 .0003 6,800 1.85 .0003
No.3-48UNC .0748 9,200 2.83 .0003 7,500 2.32 .0003 5,900 1.81 .0003
No.4-40UNC .0827 8,300 3.07 .0004 6,800 2.52 .0004 5,300 1.97 .0004
No.6-32UNC .1004 6,900 3.27 .0004 5,600 2.64 .0004 4,400 2.09 .0004
No.8-32UNF .1299 5,300 2.8 .00063 4,300 2.24 .00063 3,400 1.77 .00063
No.8-36UNF .1299 5,300 2.8 .0006 4,300 2.24 .0006 3,400 1.77 .0006
No.10-32UNF .1378 5,000 3.66 .00067 4,100 3.03 .00067 3,200 2.36 .00067
No.10-24UNC .1378 5,000 3.66 .0007 4,100 3.03 .0007 3,200 2.36 .0007
¼-20UNC .187 3,700 3.5 .0009 3,000 2.87 .0009 2,300 2.2 .0009
¼-28UNF .1969 3,500 2.91 .001 2,900 2.44 .001 2,200 1.85 .001
⁵⁄₁₆-18UNC .2362 2,900 3.35 .0012 2,400 2.76 .0012 1,900 2.2 .0012
⁵⁄₁₆-24UNF .2362 2,900 3.35 .00118 2,400 2.76 .00118 1,900 2.2 .00118
⅜-16UNC .2638 2,600 4.13 .0013 2,100 3.35 .0013 1,700 2.72 .0013
⁷⁄₁₆-14UNC .3031 2,300 4.33 .0015 1,900 3.58 .0015 1,400 2.64 .0015
½-13UNC .3622 1,900 3.78 .0018 1,600 3.19 .0018 1,200 2.4 .0018
½-20UNF .3622 1,900 3.78 .00181 1,600 3.19 .00181 1,200 2.4 .00181
⁹⁄₁₆-12UNC .4134 1,700 3.54 .002 1,400 2.91 .002 1,100 2.28 .002
⅝-11UNC .4488 1,500 3.58 .0021 1,300 3.11 .0021 1,000 2.4 .0021
⅝-18UNF .4488 1,500 3.58 .00213 1,300 3.11 .00213 1,000 2.4 .00213
¾-10UNC .5709 1,200 2.8 .00244 1,000 2.32 .00244 800 1.85 .00244
⅞-9UNC .5906 1,200 3.94 .00252 1,000 3.27 .00252 700 2.28 .00252
1-8UNC .622 1,100 4.37 .00264 900 3.58 .00264 700 2.8 .00264

【Note】①EDT thread mills are capable of simultaneous boring and threading.

②The above cutting conditions are for the thread diameters stated in the table. Cutting conditions for other thread diameters should be calculated taking into consideration the
Cutting Considerations (page 19).
③The machinery should be a machining center equipped with NC (numerical control) equipment having a helical interpolation function.
④The feed rate stated in the above conditions table is the feed rate at the tool center during tapping. In addition, the per-tooth feed rate is the numerical value at the cutting point.
⑤Since there is a risk of cutting chips getting inside the machine, when using tools equipped with oil holes, be sure to use the oil holes.
⑥Use the appropriate coolant for the work material and machining shape.
⑦These conditions are for general guidance; in actual machining conditions adjust the parameters according to your actual machine conditions.

09
 Recommended Cutting Conditions
Epoch Thread Mill

Metric Screw
Cast Iron, Carbon Steels Tool Steels Pre-hardened Steels
Work Material
150～200HB 25 ～ 35HRC 35 ～ 45HRC
vc (m/min) 80 ～ 85 ～ 90 70 ～ 75 ～ 80 60 ～ 65 ～ 70
Thread Dia. DC RPM Feed Rate vf Feed/Tooth fz RPM Feed Rate vf Feed/Tooth fz RPM Feed Rate vf Feed/Tooth fz
TD (mm) (min-1) (mm/min) (mm/t) (min-1) (mm/min) (mm/t) (min-1) (mm/min) (mm/t)
M2 1.4 19,300 139 0.006 17,100 123 0.006 14,800 107 0.006
M2.2 1.6 16,900 129 0.007 14,900 114 0.007 12,900 99 0.007
M2.5 1.8 15,000 134 0.008 13,300 119 0.008 11,500 103 0.008
M3 2.4 11,300 99 0.011 9,900 87 0.011 8,600 76 0.011
M4 3.1 8,700 117 0.015 7,700 104 0.015 6,700 90 0.015
M5 3.8 7,100 123 0.018 6,300 109 0.018 5,400 93 0.018
M6 4.6 5,900 127 0.023 5,200 112 0.023 4,500 97 0.023
M8 6.2 4,400 123 0.031 3,900 109 0.031 3,300 92 0.031
M10 7.5 3,600 137 0.038 3,200 122 0.038 2,800 106 0.038
M12 9 3,000 135 0.045 2,700 122 0.045 2,300 104 0.045
M16 11.5 2,400 149 0.055 2,100 130 0.055 1,800 111 0.055
M18 14 1,900 106 0.063 1,700 95 0.063 1,500 84 0.063
M20 15 1,800 115 0.064 1,600 102 0.064 1,400 90 0.064

Hardened Steels Hardened Steels Hardened Steels Stainless Steels

Work Material
45 ～ 55HRC 55 ～ 62HRC 62 ～ 66HRC 300 series
vc (m/min) 50 ～ 55 ～ 60 40 ～ 45 ～ 50 30 ～ 35 ～ 40
Thread Dia. DC RPM Feed Rate vf Feed/Tooth fz RPM Feed Rate vf Feed/Tooth fz RPM Feed Rate vf Feed/Tooth fz
TD (mm) (min-1) (mm/min) (mm/t) (min-1) (mm/min) (mm/t) (min-1) (mm/min) (mm/t)
M2 1.4 12,500 90 0.006 10,200 73 0.006 8,000 58 0.006
M2.2 1.6 10,900 83 0.007 9,000 69 0.007 7,000 53 0.007
M2.5 1.8 9,700 87 0.008 8,000 72 0.008 6,200 56 0.008
M3 2.4 7,300 64 0.011 6,000 53 0.011 4,600 40 0.011
M4 3.1 5,600 76 0.015 4,600 62 0.015 3,600 49 0.015
M5 3.8 4,600 79 0.018 3,800 66 0.018 2,900 50 0.018
M6 4.6 3,800 82 0.023 3,100 67 0.023 2,400 52 0.023
M8 6.2 2,800 78 0.031 2,300 64 0.031 1,800 50 0.031
M10 7.5 2,300 87 0.038 1,900 72 0.038 1,500 57 0.038
M12 9 1,900 86 0.045 1,600 72 0.045 1,200 54 0.045
M16 11.5 1,500 93 0.055 1,200 74 0.055 1,000 62 0.055
M18 14 1,300 73 0.063 1,000 56 0.063 800 45 0.063
M20 15 1,200 77 0.064 1,000 64 0.064 700 45 0.064

【Note】
①EDT thread mills are capable of simultaneous boring and threading.
②The above cutting conditions are for the thread diameters stated in the table. Cutting conditions for other thread diameters should be
calculated taking into consideration the Cutting Considerations (page 19).
③The machinery should be a machining center equipped with NC (numerical control) equipment having a helical interpolation function.
④The feed rate stated in the above conditions table is the feed rate at the tool center during tapping. In addition, the per-tooth feed rate is the
numerical value at the cutting point.
⑤Since there is a risk of cutting chips getting inside the machine, when using tools equipped with oil holes, be sure to use the oil holes.
⑥Use the appropriate coolant for the work material and machining shape.
⑦These conditions are for general guidance; in actual machining conditions adjust the parameters according to your actual machine conditions.

10
 Line up
Epoch Thread Mill
for PT,NPT
Threads

Left-hand
edge
BHTA2

DC DCON

LB2
4 flutes 1 incomplete thread and LF
2 complete threads
BHTA2：1.7°
※The neck angle (BHTA2) of EDT-PT1(NPT1)-45-ATH is 0° (straight neck).

EDT-NPT - -ATH Unit : inch

Carbide
Coated

NPT Thread Thread Dia. TD Thread Reference Neck Functional Connection Oil Compensation
Stock No Pilot Pilot Hole Requred Pitch Dia. Length Length Dia. Hole Value
Order Number Hole （Pilot Hole Dia.） TP DC LB2 LF DCON D2
NPT¹⁄₁₆-27 NPT⅛-27（φ.1578 or larger）
EDT-NPT1/16-18-ATH ● .3108 .4032 27 .189 .709 2.756 .2362 － .0012
NPT⅛-27 －
EDT-NPT1/8-19-ATH ● .4032 27 .2244 .748 2.756 .2362 － .0012
NPT¼-18 NPT⅜-18（φ.2362 or larger）
EDT-NPT1/4-28-ATH ● .5361 .6715 18 .311 1.102 3.15 .3937 － .0018
NPT⅜-18 －
EDT-NPT3/8-28-ATH ● .6715 18 .378 1.102 3.15 .3937 － .0018
NPT½-14 NPT¾-14（φ.3150 or larger）
EDT-NPT1/2-35-ATH ● .8356 1.0460 14 .4528 1.378 4.331 .4724 － .0023

－ NPT1-11.5（φ.3937 or larger）
EDT-NPT1-45-ATH ● 1.3082 11.5 .6063 1.772 5.315 .6299 － .0028

EDT-PT - -ATH Unit : mm

Carbide
Coated

PT（Rc）Thread Thread Dia. TD Thread Reference Neck Functional Connection Oil Compensation
Stock No Pilot Pilot Hole Requred Pitch Dia. Length Length Dia. Hole Value
Order Number Hole （Pilot Hole Dia.） TP DC LB2 LF DCON D2
PT¹⁄₁₆-28 PT⅛-28（φ4 or large）
EDT-PT1/16-18-ATH ● 7.723 9.728 0.9071 4.8 18.0 70.0 6.0 － 0.029
PT⅛-28 －
EDT-PT1/8-19-ATH ● 9.728 0.9071 5.7 19.0 70.0 6.0 － 0.029
PT¼-19 PT⅜-19（φ6 or large）
EDT-PT1/4-28-ATH ● 13.157 16.662 1.3368 7.9 28.0 80.0 10.0 － 0.043
PT⅜-19 －
EDT-PT3/8-28-ATH ● 16.662 1.3368 9.6 28.0 80.0 10.0 － 0.043
PT½-14 PT¾-14（φ8 or large）
EDT-PT1/2-35-ATH ● 20.955 26.441 1.8143 11.5 35.0 110.0 12.0 － 0.058

－ PT1-11（φ10 or large）
EDT-PT1-45-ATH ● 33.249 2.3091 15.4 45.0 135.0 16.0 － 0.074

●： Inventory maintained in US Thread diameter which requires pilot hole can not be used without larger pilot hole than the values shown in the table.

Cautions when using Epoch D Thread Mill for PT, NPT threads
Since the Reference cutting diameter DC and the tool tip diameter DC'
Outer diameter line are different, it is necessary to correct the Thread diameter TD and
(¹⁄16 taper line passing through the apex of thread ridge)
program. The thread diameter TD corresponds to the reference diameter
of the groove of the internal thread (reference diameter of the tap).

Example

Thread milling PT¼ with EDT-PT1/4-28-ATH

Thread diameter TD + compensation value D2
Reference dia. DC = setup thread diameter 13.157 ＋ 0.043 ＝ 13.2
When adjusting the reference diameter position of the internal thread by tool
diameter correction, the correction value is calculated using the following formula.
Tip dia. DC' *In the case of radius indication in the NC program based on the tool center
(Reference tool dia. DC ± adjustment length x ¹⁄16) ÷ 2 (Convert to radius)
Thread Dia. DC: （7.9 － 2× ¹⁄16）÷ 2＝ 3.8875
diameter at the virtual crest position of the first thread Calculate with plus for shallowing and minus for deepening. Therefore in this case,
Tip dia. DC': diameter at the tool tip position it becomes 2 mm deeper.
11
 Recommended Cutting Conditions
Epoch Thread Mill
for PT,NPT
Threads

NPT Thread
Cast Iron, Carbon Steels Tool Steels Pre-hardened Steels
Work Material
150～200HB 25 ～ 35HRC 35 ～ 45HRC
vc (sfm) 262 ～ 279 ～ 295 230 ～ 246 ～ 262 197 ～ 219 ～ 230
Thread Dia. DC RPM Feed Rate vf Feed/Tooth fz RPM Feed Rate vf Feed/Tooth fz RPM Feed Rate vf Feed/Tooth fz
TD (in) (min-1) (in/min) (in/t) (min-1) (in/min) (in/t) (min-1) (in/min) (in/t)
NPT¹⁄₁₆-27 .189 5,600 6.14 .00094 5,000 5.51 .00094 4,300 4.72 .00094
NPT⅛-27 .224 4,700 7.95 .00114 4,200 7.09 .00114 3,600 6.1 .00114
NPT¼-18 .311 3,400 7.17 .00157 3,000 6.3 .00157 2,600 5.47 .00157
NPT⅜-18 .378 2,800 7.87 .00189 2,500 7.05 .00189 2,200 6.18 .00189
NPT½-14 .453 2,400 8.23 .00217 2,100 7.2 .00217 1,800 6.18 .00217
NPT¾-14 .453 2,400 10.98 .00217 2,100 9.61 .00217 1,800 8.23 .00217
NPT1-11.5 .606 1,800 9.09 .00256 1,600 8.07 .00256 1,300 6.57 .00256

Hardened Steels Hardened Steels Hardened Steels Stainless Steels

Work Material
45 ～ 55HRC 55 ～ 62HRC 62 ～ 66HRC 300 series
vc (sfm) 164 ～ 180 ～ 197 131 ～ 148 ～ 164 98 ～ 115 ～ 131
Thread Dia. DC RPM Feed Rate vf Feed/Tooth fz RPM Feed Rate vf Feed/Tooth fz RPM Feed Rate vf Feed/Tooth fz
TD (in) (min-1) (in/min) (in/t) (min-1) (in/min) (in/t) (min-1) (in/min) (in/t)
NPT¹⁄₁₆-27 .189 3,600 3.98 .00094 3,000 3.31 .00094 2,300 2.52 .00094
NPT⅛-27 .224 3,100 5.24 .00114 2,500 4.21 .00114 2,000 3.39 .00114
NPT¼-18 .311 2,200 4.65 .00157 1,800 3.78 .00157 1,400 2.95 .00157
NPT⅜-18 .378 1,800 5.08 .00189 1,500 4.21 .00189 1,200 3.39 .00189
NPT½-14 .453 1,500 5.16 .00217 1,200 4.13 .00217 1,000 3.43 .00217
NPT¾-14 .453 1,500 6.85 .00217 1,200 5.47 .00217 1,000 4.57 .00217
NPT1-11.5 .606 1,100 5.55 .00256 900 4.57 .00256 700 3.54 .00256

【Note】
①Epoch D Thread Mill is capable of simultaneous boring and threading.
②The above cutting conditions are for the thread diameters stated in the table. Cutting conditions for other thread diameters should be
calculated taking into consideration the cautions on use (p.19).
③The machinery should be a machining center equipped with NC (numerical control) equipment having a helical interpolation function.
④The feed rate stated in the above conditions table is the feed rate at the tool center during tapping. In addition, the per-tooth feed rate is the
numerical value at the cutting point.
⑤Since there is a risk of cutting chips getting inside the machine, when using tools equipped with oil holes, be sure to perform processing using
the oil holes.
⑥Use the appropriate coolant for the work material and machining shape.
⑦These conditions are for general guidance; in actual machining conditions adjust the parameters according to your actual machine conditions.

12
 PT (Rc) Thread
Cast Iron, Carbon Steels Tool Steels Pre-hardened Steels
Work Material
150～200HB 25 ～ 35HRC 35 ～ 45HRC
vc (m/min) 80 ～ 85 ～ 90 70 ～ 75 ～ 80 60 ～ 65 ～ 70
Thread Dia. DC RPM Feed Rate vf Feed/Tooth fz RPM Feed Rate vf Feed/Tooth fz RPM Feed Rate vf Feed/Tooth fz
TD (mm) (min-1) (mm/min) (mm/t) (min-1) (mm/min) (mm/t) (min-1) (mm/min) (mm/t)
PT¹⁄₁₆-28 4.8 5,600 146 0.024 5,000 131 0.024 4,300 112 0.024
PT⅛-28 5.7 4,700 181 0.029 4,200 162 0.029 3,600 139 0.029
PT¼-19 7.9 3,400 167 0.04 3,000 148 0.04 2,600 128 0.04
PT⅜-19 9.6 2,800 192 0.048 2,500 171 0.048 2,200 150 0.048
PT½-14 11.5 2,400 204 0.055 2,100 179 0.055 1,800 153 0.055
PT¾-14 11.5 2,400 278 0.055 2,100 243 0.055 1,800 208 0.055
PT1-11 15.4 1,800 231 0.065 1,600 206 0.065 1,300 167 0.065

Hardened Steels Hardened Steels Hardened Steels Stainless Steels

Work Material
45 ～ 55HRC 55 ～ 62HRC 62 ～ 66HRC 300 series
vc (m/min) 50 ～ 55 ～ 60 40 ～ 45 ～ 50 30 ～ 35 ～ 40
Thread Dia. DC RPM Feed Rate vf Feed/Tooth fz RPM Feed Rate vf Feed/Tooth fz RPM Feed Rate vf Feed/Tooth fz
TD (mm) (min-1) (mm/min) (mm/t) (min-1) (mm/min) (mm/t) (min-1) (mm/min) (mm/t)
PT¹⁄₁₆-28 4.8 3,600 94 0.024 3,000 78 0.024 2,300 60 0.024
PT⅛-28 5.7 3,100 120 0.029 2,500 96 0.029 2,000 77 0.029
PT¼-19 7.9 2,200 108 0.04 1,800 89 0.04 1,400 69 0.04
PT⅜-19 9.6 1,800 123 0.048 1,500 103 0.048 1,200 82 0.048
PT½-14 11.5 1,500 128 0.055 1,200 102 0.055 1,000 85 0.055
PT¾-14 11.5 1,500 174 0.055 1,200 139 0.055 1,000 116 0.055
PT1-11 15.4 1,100 141 0.065 900 116 0.065 700 90 0.065

【Note】
①Epoch D Thread Mill is capable of simultaneous boring and threading.
②The above cutting conditions are for the thread diameters stated in the table. Cutting conditions for other thread diameters should be
calculated taking into consideration the cautions on use (p.19).
③The machinery should be a machining center equipped with NC (numerical control) equipment having a helical interpolation function.
④The feed rate stated in the above conditions table is the feed rate at the tool center during tapping. In addition, the per-tooth feed rate is the
numerical value at the cutting point.
⑤Since there is a risk of cutting chips getting inside the machine, when using tools equipped with oil holes, be sure to perform processing using
the oil holes.
⑥Use the appropriate coolant for the work material and machining shape.
⑦These conditions are for general guidance; in actual machining conditions adjust the parameters according to your actual machine conditions.

Advantages of using Epoch D Thread Mill in pipe threading

Epoch D Thread Mill General tap

Stop marks

No stop marks
Good finished surface without tear Tears easily and stop marks occurred

Effective for countermeasures against liquid leakage

that is often caused by tapping.
13
 Te c h n i c a l d a t a

Field data of Epoch Thread Mill

01 Threading of hardened steels (M4×P0.7)

Cutting conditions
Epoch
Work material：D2(60HRC) Tool：ET-0.7-8-PN Thread Mill
n= 4,620min-1(vc=45m/min) v f =62mm/min（f z =0.015mm/t）
Threading depth：8mm Blind hole
Pilot hole dia.×Pilot hole depth：φ3.4×12mm Coolant：Air-blow Damaged on
10th hole The first
Conventional
Damaged on The second
7th hole

0 10 20 30 40 50
Threading hole count (holes)

Epoch Thread Mill Conventional In the above example after 50 holes, the tool shows minimum wear.
after threading 50 holes after threading 10 holes.

02 Threading of sintered HSS material (M4×P0.7)

Cutting conditions Epoch

Work material：High Speed Steel (64HRC) Tool：ET-0.7-8-PN Thread Mill
n=4,620min-1(vc=45m/min) v f =47mm/min （f z =0.025mm/t）
Threading depth：7mm Through hole
Provides machining even The first
Pilot hole dia.×Pilot hole depth：φ3.4×7mm Coolant：Water-base
on sintered HSS material! The second

In the above example after 20 holes, the tool shows minimum wear. 0 10 20
Threading hole count (holes)

03 Threading of pre-hardened steel (M12×P1.75)

Cutting conditions
Work material：P21 Modified(40HRC) Tool：ET-1.75-24-PN
n=3,537min-1(vc=100m/min) v f =311mm/min （f z =0.088mm/t）
Threading depth：22mm Blind hole
Pilot hole dia.×Pilot hole depth：φ10.5×28mm Coolant：Water-base
Epoch Thread Mill after threading 300 holes.
In the above example after 300 holes, the tool shows minimum wear.

04 Threading of stainless steel (M8×P1.25)

Cutting conditions
Work material：304 Stainless Steel Tool：ET-1.25-20-PN
n=5,130min-1(vc=100m/min) v f =277mm/min（f z =0.06mm/t）
Threading depth：20mm Blind hole
Pilot hole dia.×Pilot hole depth：φ6.9×22mm Coolant：Water-base
Epoch Thread Mill after threading 300 holes.
In the above example after 300 holes, the tool shows minimum wear.
14
 05 Threading of superalloy (M6×P1)

Cutting conditions
Work material：Inconel 718 (40HRC) Tool：ET-1.0-12-PN
n=2,420min-1(vc=35m/min) v f =56mm/min（f z =0.025mm/t）
Threading depth：12mm Blind hole
Pilot hole dia.×Pilot hole depth：φ5.1×15mm Coolant：Water-base

Epoch Thread Mill after threading 25 holes.

It is possible to thread superalloy which is difficult to tap.

06 Threading of non-ferrous (Aluminium alloy A7075, Acrylic resin) (M6×P1)

Cutting conditions Work material：Aluminium alloy A7075, Acrylic resin

Tool：ET-1.0-12-PN n =14,500min-1(vc=210m/min) v f =540mm/min（f z =0.04mm/t）
Threading depth：12mm Blind hole Pilot hole dia.×Pilot hole depth：φ5×15mm

Work material Aluminium alloy A7075 Acrylic resin

Coolant Water-base Air-blow Water-base Air-blow

Surface

High efficiency threading is possible even in dry condition.

※By using water-soluble cutting fluid, it is possible to obtain a glossy high-quality machined surface.
※By using water-soluble cutting fluid, Epoch D Thread Mill can be used with same cutting parameters.

Recommended pilot hole dia.

Metric threads Unified threads

Thread Pitch Recommended Thread Pitch Recommended Thread Pitch Recommended Thread Pitch Recommended
Order Number Dia. TPI pilot hole dia. Order Number Dia. P pilot hole dia. Order Number Dia. TPI pilot hole dia. Order Number Dia. TPI pilot hole dia.
TD (mm) (mm) TD (mm) (mm) TD (in) (in) TD (in) (in)

ET-0.4-4-PN M2 0.4 1.6 ET-0.4-5-PN M2 0.4 1.6

ET-U64-3.7-PN No.1-64UNC .073 64 .0594 ET-U64-4.6-PN No.1-64UNC .073 64 .0594
ET-0.45-4.4-PN M2.2 0.45 1.75 ET-0.45-5.5-PN M2.2 0.45 1.75
ET-U56-4.4-PN No.2-56UNC .086 56 .0705 ET-U56-5.5-PN No.2-56UNC .086 56 .0705
ET-0.45-5-PN M2.5 0.45 2.05 ET-0.45-6.25-PN M2.5 0.45 2.05
ET-U48-5-PN No.3-48UNC .099 48 .0807 ET-U48-6.3-PN No.3-48UNC .099 48 .0807
ET-0.5-6-PN M3 0.5 2.5 ET-0.5-7.5-PN M3 0.5 2.5
ET-U40-5.7-PN No.4-40UNC .112 40 .0894 ET-U40-7.1-PN No.4-40UNC .112 40 .0894
ET-0.7-8-PN M4 0.7 3.3 ET-0.7-10-PN M4 0.7 3.3
ET-U32-7-PN No.6-32UNC .138 32 .1091 ET-U32-8.8-PN No.6-32UNC .138 32 .1091
ET-0.8-10-PN M5 0.8 4.2 ET-0.8-12.5-PN M5 0.8 4.2
ET-U36-8.3-PN No.8-36UNF .164 36 .1382 ET-U36-10.4-PN No.8-36UNF .164 36 .1382
ET-1.0-12-PN M6 1 5 ET-1.0-15-PN M6 1 5
ET-U24-9.7-PN No.10-24UNC .19 24 .1508 ET-U24-12.1-PN No.10-24UNC .19 24 .1508
ET-1.25-16-PN M8 1.25 6.75 ET-1.25-20-PN M8 1.25 6.75
ET-U20-12.7-PN ¼-20UNC 1/4 20 .2016 ET-U20-15.9-PN ¼-20UNC 1/4 20 .2016
ET-1.5-20-PN M10 1.5 8.5 ET-1.5-25-PN M10 1.5 8.5
ET-U28-12.7-PN ¼-28UNF 1/4 28 .2154 ET-U28-15.9-PN ¼-28UNF 1/4 28 .2154
ET-1.75-24-PN M12 1.75 10.25 ET-1.75-30-PN M12 1.75 10.25
ET-U18-15.9-PN ⁵⁄₁₆-18UNC 5/16 18 .2587 ET-U18-19.8-PN ⁵⁄₁₆-18UNC 5/16 18 .2587
ET-2-32-PN M16 2 14 ET-2-40-PN M16 2 14
ET-U16-19.1-PN ⅜-16UNC 3/8 16 .3142 ET-U16-23.8-PN ⅜-16UNC 3/8 16 .3142
ET-2.5-36-PN M18 2.5 15.5 ET-2.5-45-PN M18 2.5 15.5
ET-U14-22.2-PN ⁷⁄₁₆-14UNC 7/16 14 .3681 ET-U14-27.8-PN ⁷⁄₁₆-14UNC 7/16 14 .3681
ET-2.5-40-PN M20 2.5 17.5 ET-2.5-50-PN M20 2.5 17.5
ET-U13-25.4-PN ½-13UNC 1/2 13 .4256 ET-U13-31.8-PN ½-13UNC 1/2 13 .4256
ET-U12-28.6-PN ⁹⁄₁₆-12UNC 9/16 12 .4803 ET-U12-35.7-PN ⁹⁄₁₆-12UNC 9/16 12 .4803
※Recommended pilot hole diameters are for internal threads regulated
ET-U11-31.8-PN ⅝-11UNC 5/8 11 .5354 ET-U11-39.7-PN ⅝-11UNC 5/8 11 .5354
by former JIS class 2 and Unified class 2B.
15
 Te c h n i c a l d a t a

Field data of Epoch D Thread Mill

01 Simultaneous threading and drilling on hardened steels (M8×P1.25)

Cutting conditions
Work material：D2(Improved)(62HRC) Epoch D
Tool：EDT-1.25-16-TH Thread Mill
n =2,060min-1(vc=40m/min) v f =47mm/min（f z =0.025mm/t）
Threading depth：15mm Blind hole
Coolant：Air-blow
The first

The second
Tool condition of Epoch D Thread Mill
after machining 30 holes 0 10 20 30
Threading hole count (holes)
Wear condition is good with no
chipping or damage!

02 Simultaneous threading and drilling on hardened steels (M8×P1.25)

Cutting conditions
Work material：H13(45HRC)
Tool：EDT-1.25-16-TH
n =2,820min-1(vc=55m/min)
v f =75mm/min（f z =0.03mm/t）
Threading depth：16mm Blind hole
Coolant：Air-blow

Epoch D Thread Mill after threading 150 holes.

In the above example after 150 holes, the tool shows minimum wear.

03 Simultaneous threading and drilling on pre-hardened steels (M4×P0.7)

Cutting conditions
Work material：Pre-hardened steel(40HRC)
Tool：EDT-0.7-10-TH
n =5,650min-1(vc=55m/min)
v f =75mm/min（f z =0.015mm/t）
Threading depth：10mm Blind hole
Coolant：Air-blow

Epoch D Thread Mill after threading 400 holes.

In the above example after 400 holes, the tool shows minimum wear.
16
04 Simultaneous threading and drilling on stainless steels (M4×P0.7)

Cutting conditions
Work material：304 Stainless Steel
Tool：EDT-0.7-10-TH
n=3,600min-1(vc=35m/min)
v f =49mm/min（f z =0.015mm/t）
Threading depth：10mm Blind hole
Coolant：Water-base

Epoch D Thread Mill after threading 600 holes.

In the above example after 600 holes, the tool shows minimum wear.

05 Simultaneous threading and drilling on titanium alloys (M4×P0.7)

Cutting conditions
Work material：Ti-6Al-4V
Tool：EDT-0.7-10-TH
n=3,600min-1(vc=35m/min)
v f =49mm/min（f z =0.015mm/t）
Threading depth：10mm Blind hole
Coolant：Water-base

Epoch D Thread Mill after threading 64 holes.

Threading titanium alloy which is difficult to tap, is possible without a pilot hole.

for PT,NPT
Threads
06 Simultaneous threading and drilling on hardened steel (PT¹⁄16-28)

Cutting conditions
Work material：STAVAX(52HRC)
Tool：EDT-PT1/16-18-ATH
n=3,600min-1(vc=55m/min)
v f =94mm/min（f z =0.024mm/t）
Threading depth：16mm
Coolant：Air-blow

Epoch D Thread Mill after threading 50 holes.

In the above example after 50 holes, the tool shows minimum wear.
17
 Tr o u b l e s h o o t i n g

Regarding thread diameter expansion/contraction

Suitable tool diameter correction should be performed according to the work material and tool
wear condition. Also, please be careful not to forget to input the tool diameter compensation
value into the machine.

Dimensional accuracy worsens when moving toward the bottom of the hole (deflection)

A characteristic of the thread milling method is that tool deflection increases as the tool
progresses toward the bottom of the hole.
It may be necessary to perform zero cutting in order to perform high-accuracy thread milling
with low deflection.

Regarding tool breakage

As a countermeasure against tool breakage, performing processing with a reduced feed rate is
effective. In addition, when processing with tool extended or when large rough cutting chips are
produced, breakage due to chip clogging should be considered. In such cases, if processing is
performed with a higher cutting speed, the cutting chips will be broken into smaller bits which
may improve conditions.

Changes in cutting chip conditions due to different cutting speeds;

Simultaneous boring and thread milling (M8 × P 1.25) of carbon steel

Low Cutting Speed High

If the NC program using Mitsubishi Hitachi Tool's NC program creation software doesn't work properly.

There are differences in the programming code for the machine being used. Please contact the
machine manufacturer for details.

Regarding upper limit on Machinable Thread Diameters

Please note that since the Epoch D Thread Mill performs boring simultaneously, it cannot
perform thread milling for diameters of more than 1.68 times the tool diameter DC.
There are no particular similar limitations on using the Epoch Thread Mill.
Also, please be aware that if screws of a size smaller than the thread diameter described in
the line-up table are processed, there is a possibility of malfunctioning the screw shape.
Example) Threading M14×P2 with ET-2-40-PN (designed for M16×P2)

18
Cautions on use

About tool feed rate

When performing thread milling by helical interpolation, the cutting
TD-DC
point feed rate should be multiplied by a coefficient to determine the
v f=fz ×CICT×n×
tool center feed rate.
The equation for calculating the tool center feed rate is shown at
TD
right. vf ：Feed rate (mm/min)
The standard cutting conditions for PT and NPT threads are fz ：Feed per tooth (mm/t)
calculated based on the thread diameter TD at the machinable CICT ：No. of flutes
maximum depth (neck length).
n ：Rotation (min-1)
Example) Thread milling PT⅛ with EDT-PT1/8-19-ATH
TD ：Thread Dia. (mm)
TD= 9.728 (TD) -19 (under neck length) × ¹⁄16 (thread taper angle) = 8.5405
DC ：Cutting Dia. (mm)

About tool diameter correction

When performing thread milling by helical interpolation, it may be necessary to compensate for increased cutting resistance
due to differences in work materials or tool wear condition.
In the NC programs created using Mitsubishi Hitachi Tool's NC program creation software, tool diameter correction is in
radius designation format.

Correction example Threading of hardened material (60HRC) (M8×P1.25)

Work material：D2(60HRC) Tool：ET-1.25-20-PN(Tool dia. φ6.2) Pilot hole dia.×Pilot hole depth：φ6.8×25mm
n=2,060min-1（vc=40m/min） v f =56mm/min fz =0.03mm/t Threading depth：20mm Blind hole

Threading hole count

10 20 30 40
(holes)
Tool life has
Tool dia. correction value
(mm) 3.09 3.08 3.06 3.04 NOT been reached.

About coolant
・The first recommended coolant shown in the table tends to have the superior
tool life. When priority is given to finished surface quality, water-soluble
cutting fluids are effective. Oil-based cutting fluids are not suitable because
they degrade chip removal characteristics.
・The holder should grip the tool shank so that the holder does not block the
hole and the shank projection amount is 1 to 2 times the shank diameter.
The coolant nozzle should then be positioned so that the coolant will reach
the bottom of the hole. In addition, coolant pressure should be adjusted so
that it removes cutting chips. If the setting is bad, cutting chip clogging may
lead to flute tip damage or tool breakage.
・Since there is a risk of cutting chips getting inside the machine, when using
1 to 2 times
tools equipped with oil holes, be sure to perform processing using the oil holes. shank
diameter
ET EDT
Work material
Air-blow Water-base Air-blow Water-base
Hardened steel,
Pre-hardened steel
Tool steel, Cast iron, ◎ ○ ◎ △
Carbon steel

Stainless steel × ◎ × ◎
◎：First recommended
Super heat resistant alloy,
Titanium alloy × ◎ × ◎ ○：Second recommended
Aluminium alloy, △：Tendency to decrease tool life
○ ◎ × ◎
Copper alloy, Resin ×：Not recommended

19
Los Angeles Head Office Toronto (Customer Service)
11250 Slater Avenue 3535 Laird Road, Units 15 & 16
Fountain Valley, CA 92708, USA Mississauga, Ontario, L5L 5Y7, CANADA
Tel: 714 352 6100 Tel: 905 814 0240
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Customer Service for Mitsubishi Hitachi Mexico Office

Tool Engineering, Ltd. Products MMC METAL DE MEXICO, S.A. DE C.V.
41700 Gardenbrook Road, Suite 120 Av. La Canada No.16
Novi, MI 48375, USA Parque Industrial Bernardo Quintana
Tel: 248 308 2620 El Marques, Queretaro C.P. 76246 MEXICO
Fax: 248 308 2627 Tel: +52 442 221 61 36
Email: rfqHTdiv@mmus.com Fax: +52 442 221 61 34

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(Manufacturer)
2018 1st Edition
NO. H1803A-1