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NGK Heat Range

This document contains design symbols used for spark plugs. It includes symbols for thread size and dimensions, construction type, heat rating, thread reach, firing end construction, and spark gap. For example, symbol B represents a 1" hex size with an 18mm thread diameter, symbol P indicates a projecting insulator type, 5 represents a heat rating of 500°C, and -11 shows a spark gap of 1.1mm. In total, over 50 different symbols are defined to concisely communicate key spark plug specifications.

Uploaded by

Aldi Kusumaw
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© © All Rights Reserved
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214 views1 page

NGK Heat Range

This document contains design symbols used for spark plugs. It includes symbols for thread size and dimensions, construction type, heat rating, thread reach, firing end construction, and spark gap. For example, symbol B represents a 1" hex size with an 18mm thread diameter, symbol P indicates a projecting insulator type, 5 represents a heat rating of 500°C, and -11 shows a spark gap of 1.1mm. In total, over 50 different symbols are defined to concisely communicate key spark plug specifications.

Uploaded by

Aldi Kusumaw
Copyright
© © All Rights Reserved
We take content rights seriously. If you suspect this is your content, claim it here.
Available Formats
Download as PDF, TXT or read online on Scribd
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Design Symbols

B P 5 E S -11
Thread Construction
Heat
Dimensions (One or more letters Thread Reach Firing End Construction Spark Gap
Rating
/ Hex. Size may be combined)
Hot Motorcycle:
18mm / 1” Type
A (25.4mm)
L Compact Type 2 E 19.0mm (3/4”) A Special Design None 0.7 - 0.8 mm
Car: 0.8 - 0.9 mm
18mm / 13/16” Compact Type 19.0mm (3/4”)
AB (20.8mm)
M (Bantam) 3/4” Hex Size 4 EH Half Thread
B Integral Terminal (Solid) -6 0.6mm (.024”)

14mm / 13/16” Projecting Low Angle


B (20.8mm)
P Insulator Type 5 H 12.7mm (1/2”) C Ground Electrode
-7 0.7mm (.028”)

14mm / 5/8” Low Angle Ground


BC (16.0mm) R Resistor Type 6 L 11.2mm (7/16”) CM Electrode Compact Type -8 0.8mm (.032”)
JIS Type (Insulator Length:18.5mm)

V-Grooved Center
14mm / 5/8”
Surface Gap, Semi- Electrode (14mm only)
BK (16.0mm) 7 S 9.5mm (3/8”) E 1.5mm Insulator
-9 0.9mm (.036”)
ISO Type Surface Discharge Gap
U or Supplementary Gap Projection
10mm / 5/8” Inductive Resistor Type
C (16.0mm)
8 Z 21mm F Tapered Seat -10 1.0mm (.040”)

12mm Fine Wire Nickel Alloy


D (18.0 mm)
Z Inductive Resistor Type 9 G Center Electrode
-11 1.1mm (.044”)
Bantam Type
12mm / 5/8” Copper Core Ground
DC (16.0mm)
10 -G Electrode
-13 1.3mm (.052”)
Cold
E 8mm / 13.0mm 11 Type BM--- 9.5mm (3/8’) GP Platinum Alloy Fine Wire -14 1.4mm (.055”)

12mm / 5/8” Gold-Palladium Center


J (16.0mm)
BPM--- 9.5mm (3/8’) GV Electrode (Racing Line)
-15 1.5mm (.060”)

CM--- 9.5mm (3/8’) HX Special Design

I Single Iridium Spark Plug


Tapered Seat
High Performance Iridium
IX (0.6mmØ)

A-F--- 10.9mm K 2-Ground Electrode -S Special Gasket


Special
B-F--- 11.2mm (7/16”) -L Medium Heat Rating -E Resistance
17.5mm (.708”)
Compact Type
B-EF--- Reach 5/8” -LM (Insulator Length:14.5mm)
Hex Size

Special Ground
BM-F--- 7.8mm N Electrode

P Premium Platinum
No Symbol
Q 4-Ground Electrode

Standard Type
18mmø 12mm Reach S (2.5mm Center Electrode)
9.5mm (3/8’)
14mmø
Reach
T 3-Ground Electrode

U Semi-Surface Discharge

Fine Wire
V Gold-Palladium
Center Electrode
High Performance
VX Platinum
W Tungsten Electrode

V-Grooved Center
Electrode (14mm only)
Y 2.5mm Insulator
Projection
YA Fouling Resistant
Thick 2.9mm Center
Z Electrode
2

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