FORBES GOKAK rD

FORBES DIVIsION
WARRIOR ENGIN ERING
FORM THREADS
WHLTMORTH
BRTISH STANDARD 55 INC. ANGLE
Cond. M.E. wWHITWIORTHFOR sO
B.S.F
B.S.B. B.S. P.&B.S. P.T.B.S.
Nominal B.S.W.
DIa P Dril SzeInm
Drill Size In mim
TPI Drill SizeIn mm
P
Fractional
1/16" 60 .2
8.80
3/32" 48 1.9 * * *

1/8" 40 .55
.2
5/32" 32
24,22,22
3/16 11.8
550
2
1/4 20 | 24,40
9/32" 20 5.8 2440
15.25
5/16" 18 .5 10.00 20,24,40
3/8 16 7.9 11.5 20.2440
19.00
7/16" 14 .3
10.5
1/2 12 12. 21.00 14.2
9/16" 12 | .1
13.5
5/8" 11 15.5 24.5 17.5
11/16" 11 D
16.75
26
4
20.6 14,162
16.25 21.0 28.25
3/4 10 19.75 23.0, 24.0
7/8 19.25 21.5 23.8
15/16"
20.6 24.2 30.75
22.75
25.5
4. 39.5
1.1/8 28.5 30.5
.0
1.1/4 31.5 3.
0. 45.00
1.3/8 36.9
34.3 40.0
1.1/2" 35.7
37.7
51.00
1.5/8" 5 41.0 43.5
1.3/4" 43.7 46.5 14 48.8
1.7/84%
41.3 49.6 11 57.00 THREADS

2 42 1
44.5
AMERICAN
4
NATIONAL FORM
60° INC. ANGLE
N.S.
N. S
N.EFNLC&UNcN.UNF N.P.T.&N.P.S.
ON.C.&UNc.M.F.&U.N.F N.P.T.&N.P.S.
Dil Sias in mm
Drill Size in TP Drill Size In mm TPI Fracional I nmm
DrillSize
Fractional n mm 64 1.20 |13/8 630.75 1232.75 44.0
1/16
|27 6.0
48 1.85 1.1/2"|6 34.00 12 36.00 11.5 43.5 36.90
3/32 40 2.60 1.5/8
1/8 32&35 3.20 &3.30 1.3/45|39.50
5/32 |24&32 3.80&4.00 1.7/8 11.5 55.0 56.0
24&32 4.50 &4,80 AMERICAN NATIONALTHREADS
1/4"20 5.10 28 5.50 18 10.7 11.1 24832 5.30&5.603 60° INC. ANGLE
I- 20&32 6.70 &7.20| 32
5/16" 18 6.6024 6.90 --
8.50 18 14.25 14.5 20 8.30 32 N..C. N.F. U.N.C. U.N.F.
3/816 8.00 24 24 10.00 28 TPI Drl Sizeh mm
Dril Size In mm TPI DrillSize
7/16 14|9.40 20 9.90 - | 18.0 128&24|10.50& 11.50 28Size No.TPI Drill Size
in mm
1/2 13 10.80 20 11.50 14 17.5 24
80 1.25
9/16" 12 12.20 18 12.90- 1.55
5/ 1113.50 18|14.50 12 13.90 24 1.55
1.85 64 1.90
11/16 -
11&16 15.00 &15.90 24
2 | 16.70 2.15
3/4 10 16.5 16 17.50 1422.75 2.35 2.40 40 235
13/16-- -|- 70
20.20 20 2.65
7/8919.50 14|20.40 =- 2.85 95 32 285
15/16 20 50
29.0 14 L 23.50 20 8 3.50
8 2225 12 23.25 11.5 28.5 3.90 4.10
32 24
1-1/8 7 25.00 12 26.50 | 18 10
11/4728.00 12 29.50 11.5 37.5 38.0 18 12 24 4.50 | 284.70
METRIC SPECIAL
BRITISH ASsOCIATION BRITISH STANDARD CYCLE 60° INC. ANGLE
47V4 INC. ANGLE 60° INC. ANGLE
Drill Size In mm Size M.M. Pitch DrillSize In
mm
Size Dia. TPI Drill Size Size TPI DrillSize In Size M.M.Pitch
For Fluted For Flutles For Fluted
In mm mm 12
2.65 1.60 1.80
2362 25.4 5.10 1/ 12.00
2087 28.2 4.50 5/32 3.30 45 1.75
1850 31.4 4.00 3/16 4.10 1.90 2.10
2.25 14.00
1614 4.8 3 .40 7/32 .80 45 2.05
.1417 38.5 3.00 1/4 5.60 2.15
65 15
1260 43.0 2.65 9/32" 6.35 2.50
.1102 47.9 2.30 5/16" 7:20 2.90 2
3.30 3.60 17.50
0984 52.9 2.05 3/8 8.70 20
0866 59.1 1.80 7/16" 0.30 3.70 4.00
0748 65.1 1.55 4.20 4.50 19.50
1/2 26
11.90 22
0669 72.6 1.40 9/16 13.10 5.00 5.30
.0591 81.9 1.20 9/16 3.50 6.00 6.35 21.00
.0512 90.9 1.05 5/8 15.00 7.00 7.40
13 .0472 102 0.98 11/16 16.70 1.25 6.80 7.20 26.50
1 4 0394 109.9 0.80 3/4 18.20 9.00 9.50 29.50
15 0354 120.5 0.70 24.50 8.50 9.00 32.00
16 0311 133.3 0.60 9.50 10.00 35.00
11.00 37.50
.5 10.50
 FORBES GOKAK D
FORBESDIVIsiON WARRIOR INGINRING

BRITISH STANDARD WHLTOATH FORM THREADS

Nominal
Dia.
B.S.W. B.S.F. B.S.B.
B.S.P.&B.S. P.T. B.S. Cond. M. E WHITWORTH FORM SPECIAL
Fractiane
TP Drill Sire Inmim TPI DrllSireInmm Dril Size In mm
Drill Sire Inmm TPIDrillSzeInmmTP DrllSiza Inmm TPI Drill Size In mm
T16 G0
/32 48
1 8 " 40 2.55 B.B0 2.55
40
3.30
1 6 " 24 4.0 40 4.00
45
4.B0
1/4
9/32
3 26 6.3 19 11.8 5.5 24,28,32 5.3, 5.4, 5.5
0
6.0 6
6.1 S2 6.10
5/16 6.5 22 6.8 6.8 32 7.00 24,40 6.75,7.3
7.9 20 8.3 26 8.4 19 15.25 32 B.60 24,40 8.4,8.9
7i16" 14 9.3 26 10 26 10.00 20,24,40 9.8, 10,10.55
1/2 12 10,5
16 1 26 11.5 14 19.00 11.5 26 1.50
20,24,40 11.5, 11.9, 12
9/16" 12.1 16 12.7 26
13.1 20. 13.1
5/8 13.5 14
4.7 21.00 18 14.2 14.5
1/16" 15.1 5.5 6.5 20. 16.2
3/4 10 6. .25 16.75 17.0 14 24.6 16 17.5 14,20. 17.1,17.8
/8" 19,25 21.0 14
11 19.75 28,25 16 20.6 14,16,20 20.2, 20.5,21.0
15/16 20.6 21
22 11
1.1/8" 75
22.75
5.5
24.2
27.5
30.76
16
**
23.8 12.20. 23.0, 24.0
1.1/4 28.0 28.5 30.6 11 39.5 16 30.1
1.3/8 30.1 1.5 333.7

1.1/2 33.5 34.5 36.9 45.00 14 36.1

16/8" 35.7 37.7
40.0
1.3/4" 39 41.0 20 43.5 11 51.00
1.7/8" 4 3.7 26
46.5
44.5 47
26 49.6 11 57.00 14 48.8
AMERICAN NATI9NALFORM T H R E A D S
60 INC. ANGLE
Nominal
N.C.&UN.C.N.F.&U.N.FN. P.T.&N.P.S. N.S. N.E.F N.C. &U.N.C.N.F& U.N.F. N.P.T.&N.P.S. N.S. NEF
T Drill Size DrillSize In mn
Fractional n mm TP Drill Sizo In mm TPI Practional InmmTPI mm T T Drill Size in mm TPI
116" 27 6.0 6.3 64 1.20 1.3/8" 6 30.7512 32.75 == 18
4 8 1.85 1.1/2634.0 12 36.00 11.5 43.5 44.0
8.7 40 2.60 1.5/8" 36.90
5/32" 32&35 3.20 & 3.30
3/16) 1.3/4" 5|39.50
732
24832 3.,80 &4.00 1.7/8" 42.90
24&32 4.50 &4.80 2"
1/4 20 5.10285.50 11.5 55.0 56.0
5/16"18 6.60 24 6.90 -
10.711.1 24832 5.30 &5.60 32 AMERICAN NATIONAL THREADS
3/8 20&32
16 8.0024 8.5018 14.25 14.5 20
6.70&7.20 32 600 INC. ANGLE
8.30 32 N. C.
7/16" 14|9.40 20 9.90
1/213 10.8020 11.50 14 17.5
24 | 10.00 28 .F. U. N. C.
18.0 12824 10.50 &11.50 28Size No. TPI Drill Size In mm TPI Drill Size In mm TPI Drill Size in
U.N. F.
9/16 12 12.2018 12.90 mm TPI Drill Size in mm
80 1.25
5/811| 13.50 18 14.50 12 13.90 24
11/16 64 2 1.55
11&16 15.00 &15.90 24 56 85 4 1.90
3/410 16.516 17.50 14 22.75 23.25 12 16.70 20 48 2.10
13/16- 6 2.15
20 2.35 18 2.40 2.35
7/8 9 19.5014 20.40 12 20.20 20 40 2.65
15/16 44 2.70
1 20 32 2.85 0 2.95 2.85
8 22.25 12 23.25 11.5 28.5 29.0 14 23.50 20 32 3.50 36 3.50
1.1/8 7| 25.00 12| 26.50 18 10 24 3.900 3.50
1.1/4 7 | 28.0012| 29.50 11.537.5 38.0 32 4.10 3.90 32 4.10
18 12 24 4.50 28 4.70
BRITISH ASSOCIATION BRITISH STANDARD CYCLE
474° INC.ANGLE 60° INC. ANGLE METRIC SPECIAL
60 INC. ANGLE
Size Dia. TPI Drill Size Size TPI Drill Size In Size M.M. Pitch
In mm mm
Drill Size In mm Size M.M. Pitch Drill Size In mm
2362 25.4 5.10 1/8 For FlutedFor Flutless For Fluted
2.65 1.60|1.80
2087 28.2 4.50 5/32" 4 1.5 12.50
1850 31.4 4.00 3/16"
3.30

4.10
22
2.3
45
1.75 1.9 4 12.00
.1614 34.8 3.40 1.90 2.10 14.5
7/32" 4.80
2.5 45 2.05 2.25
1417 38.5 3.00 1/4"
5.60 14.00
.1260 43.0
2.6 45 2.15 2.40
2.65 9/32 6.35 .5 16.50
.1102 7.9 2.30 5/16" 2.50 2.65 .50
94
7.20 2.90 .2
52. 2.05 3/8 18.50
.70 3.30 . .60
59,1 1.8 Z/16" 10.30 75
17.50
.0748 65.1 1.55 3.70 4.00
1/2 11.90 4.20
20.50
O669 72.6 1,40 9/16 4.50 19.50
13.10 5.00 5.30
1 1 0591 81.9 1.20 9/16" 13.50 22.50
12 .0512 90.9 1.05 5/8 6.00 5.35
13 0472 102 15.00 7.00 7.40
21.00
0.98 11/16 20
16.70 24.00
14 0394 109.9 0.80 3/4 6.80 7.20 26.50
18.20
9.00
15 .0354
0311
120.5
133.3 L 0.60
0.70
24.50 8.50
9.50
9.00
29.50
32.00
9.50 10.00
10.50 11.00 35.00
37.50
12 1.75 10.20 10.7
40.50