Design Symbols: Spark Plugs

B

P

Thread Dimensions / Hex. Size

Construction (One or more letters may be combined)

A

18mm / 1” (25.4mm)

AB

18mm / 13/16” (20.8mm)

M (Bantam) 3/4” Hex Size

B

14mm / 13/16” (20.8mm)

BC

14mm / 5/8” (16.0mm) JIS Type

BK

14mm / 5/8” (16.0mm) ISO Type

C

10mm / 5/8” (16.0mm)

D DC

12mm / 5/8” (18.0 mm) 12mm / 5/8” (16.0mm)

E

8mm /13.0mm

J

12mm / 5/8” (16.0mm)

5

E

S

-11

Heat Rating

Thread Reach

Firing End Construction

Spark Gap

L Compact Type

2

Compact Type

Hot Type

Motorcycle: 0.7 - 0.8 mm Car: 0.8 - 0.9 mm

Integral Terminal (Solid)

-6

0.6mm (.024”)

Low Angle Ground Electrode

-7

0.7mm (.028”)

-8

0.8mm (.032”)

-9

0.9mm (.036”)

19.0mm (3/4”)

A

Special Design

4

EH

19.0mm (3/4”) Half Thread

B

P Insulator Type

Projecting

5

H

12.7mm (1/2”)

C

R Resistor Type

6

L

11.2mm (7/16”)

Low Angle Ground

CM Electrode Compact Type

(Insulator Length:18.5mm)

Surface Gap, SemiSurface Discharge Gap or Supplementary Gap Inductive Resistor Type

7

S

9.5mm (3/8”)

E

V-Grooved Center Electrode (14mm only) 1.5mm Insulator Projection

8

Z

21mm

F

Tapered Seat

-10

1.0mm (.040”)

Z Inductive Resistor Type

9

G

-11

1.1mm (.044”)

-G

Fine Wire Nickel Alloy Center Electrode Copper Core Ground Electrode

-13

1.3mm (.052”)

9.5mm (3/8’)

GP

Platinum Alloy Fine Wire

-14

1.4mm (.055”)

BPM---

9.5mm (3/8’)

GV

Gold-Palladium Center Electrode (Racing Line)

-15

1.5mm (.060”)

CM---

9.5mm (3/8’)

I

Single Iridium Spark Plug

IX

High Performance Iridium (0.6mmØ)

K

2-Ground Electrode

-S

Special Gasket

-L

Medium Heat Rating

-E

Special Resistance

U

Bantam Type

10 Cold

11 Type BM---

Tapered Seat

A-F---

10.9mm

B-F---

11.2mm (7/16”)

B-EF---

17.5mm (.708”) Reach 5/8” Hex Size

N

Special Ground Electrode

BM-F---

7.8mm

P

Premium Platinum

Q

4-Ground Electrode

S

Standard Type (2.5mm Center Electrode)

No Symbol

Compact Type

-LM (Insulator Length:14.5mm)

18mmø

12mm Reach

T

3-Ground Electrode

14mmø

9.5mm (3/8’) Reach

U

Semi-Surface Discharge

V

Fine Wire Gold-Palladium Center Electrode

VX

High Performance Platinum

W

Tungsten Electrode

Y

V-Grooved Center Electrode (14mm only) 2.5mm Insulator Projection

YA 2

None

E

Z

Fouling Resistant Thick 2.9mm Center Electrode

Design Symbols: Spark Plugs

I

T

(One or more letters may be combined) High ignitability plug with double fine D electrode

I LF LT

Premium Iridium Long thread reach plug Gasket type (26.55mm reach) Long thread reach plug Tapered seat type (25mm reach)

R 4

Reach

KA

ø12.0

19.0mm, (3/4”)

Gasket

14.0mm

Hot A,B,C... Special Code None 2 Type

KB

ø12.0

19.0mm, (3/4”)

Gasket

Bi-Hex, 14mm

4

-7

0.7mm, (.028”)

MA

ø10.0

19.0mm (3/4”)

Gasket

14.0mm

5

-9

0.9mm, (.036”)

NA

ø12.0

26.5mm

Tapered

16.0mm, (5/8”)

6

I

Single Iridium Spark Plug

-10

1.0mm, (.040”)

P

Single Platinum Spark Plug

-11

1.1mm, (.044”)

-13

1.3mm, (.052”)

-14

1.4mm, (.055”)

-15

1.5mm, (.060”)

-A

Non Gasket

-B

Special Design

-C

Special Design

-D

Metal Shell Plating Spec Change

-E

Special Resistance

-G

Copper Core Ground Electrode

-H

Special Thread Type

-J

2-Ground Electrode

-K -N

Vibration-resistant Ground Electrode Special Ground Electrode

-Q

4-Ground Electrode

-S

Special Gasket

-T

3-Ground Electrode

19.0mm, (3/4”)

Gasket

20.8mm, (13/16”)

7

S

Square Tip Type

G

ø14.0

19.0mm, (3/4”)

Gasket

18.0mm

Z

Extended Projection

J

ø12.0

19.0mm, (3/4”)

Gasket

16.0mm, (5/8”)

K

ø12.0

19.0mm, (3/4”)

Gasket

16.0mm, (5/8”)

L

ø10.0

12.7mm, (1/2”)

Gasket

16.0mm, (5/8”)

M

ø10.0

19.0mm, (3/4”)

Gasket

16.0mm, (5/8”)

T

ø14.0

U

ø14.0

W

ø18.0

Ex. Gasket type FR5AP-11; reach 19 mm LFR5AP-11; reach 26.5mm Ex. Tapered-seat type PTR5C-13; reach 17.5 mm PLTR6A-10G; reach 25 mm

X

ø14.0

Y

ø14.0

PTR5A-13 ø14.0

17.5mm, (0.708”) 11.2mm, (7/16”) 10.9mm 9.5mm, (3/8”) 11.2mm, (7/16”)

25.0mm

Tapered Tapered Gasket Tapered

R 16.0mm

G

ø14.0

19.0mm, (3/4”)

Gasket

Projected

20.8mm, (13/16”)

T

ø14.0

Tapered

Projected

U

ø14.0

Tapered

Projected

W

ø18.0

Tapered

Projected

X

ø14.0

Gasket

Projected

Y

ø14.0

Tapered

Non-Projected

17.5mm, (.708”) 11.2mm, (7/16”) 10.9mm 9.5mm, (3/8”) 11.2mm, (7/16”)

16.0mm, (5/8”) 16.0mm (5/8”) 20.8mm, (13/16”) 20.8mm, (13/16”) 16.0mm, (5/8”)

ZGR-C

Cold 11 Type ZGR-D

ZGR-E

Spark Gap Motorcycle: 0.7-0.8mm Car: 0.8-0.9mm

5

5

-1

IX

Heat Rating

Spark Gap

Special Design Type

Firing End Construction

Hot

R

Projected

S T O

Gasket

I

19.0mm, (3/4”)

E S

ø14.0

R

F

10

1.5 mm Ext. Metal Shell Reach 3 mm Ext. Metal Shell Reach 3.5 mm Ext. Metal Shell Reach 3.5 mm Ext. Metal Shell Reach

16.0mm, (5/8”)

Tapered

Thread Dimension / Hex Size

ZGR-B

16.0mm, (5/8”) 20.8mm, (13/16”) 20.8mm, (13/16”) 20.8mm, (13/16”) 16.0mm, (5/8”)

Tapered

T

9

R

“L”, Long thread reach is prior to other letters which stand for thread reach. Exception: PTR5A-13; reach 25 mm

8

S T O

ø14.0

I

F

E S

Premium Platinum

Firing End Construction

R

P

Above letters are occasionally used in combination. Ex. ILFR, ILZTR

15

Thread

Hex

Heat Rating

A

Seat Type

2 Type None

1.0 mm (.040”)

F-1

4

5

1.5mm (.060”)

T-1

5

6

2mm (.080”)

W-1

3.0 mm Ext, Metal Shell None Reach 3.0 mm Ext. Metal Shell IX Reach 13.7mm Thread Reach GP

3.0 mm Ext. Metal Shell Reach 3.0 mm Ext. Metal Shell Reach 13.7mm Thread Reach

6 7 8 9 10

Cold

11 Type

3

NGK part number designation.pdf

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