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NGK Spark Plug Codes
KEYWORDS:
D E S I G N S Y M B O L S: SP A R K P L U G S
B
Thread Diameter
A: 18 mm
B: 14 mm
C: 10 mm
D: 12 mm
J: 12 mm
Plug Type
I: Iridium Platinum
L: Thread Reach 26.5mm
P: Premium
Platinum
Z: Extended Gap
Metal Shell Size
F: ø 14, 19mm (3/4”) Reach, 16mm (5/8”) Hex.
G: ø 14, 19mm (3/4”) Reach, 20.6mm (13/16”) Hex.
J: ø 12, 19mm (3/4”) Reach, 19mm Hex.
M: ø 10, 19mm (3/4”) Reach, 16mm (5/8”) Hex.
T: Tapered Seat ø 14, 17.5mm Reach, 16mm (5/8”) Hex.
PTR5A-13: ø 14, 25mm Reach, 16mm (5/8”) Hex.
Construction
R: Resistor
Firing End
Contruction
A, B, C...: Special
Design
Heat Rating
Numbers
2 Hot
11 Cold
Construction
(ONE OR MORE LETTERS
MAY BE COMBINED)
C: Hex Size 5/8”
K: Hex Size 5/8”
Projected Tip (ISO)
M: Compact Type
P: Projected Insulator
Type
R: Resistor Type
Surface or Semi-
U: Surface Discharge
Type
Z: Inductive Resistor
Thread Reach
E: 19 mm (3/4”)
EF: Tapered Seat
17.5 mm (.708” Reach)
FS: Tapered Seat
10.9 mm (.460”)
H: 12.7 mm (1/2”)
EH: Partial thread
19 mm (3/4”Total Reach)
12.7 mm (1/2”Total Thread)
L: 11.2 mm (7/16”)
S: 9.5 mm (3/8”) Reach
Z: 21 mm
NO SYMBOL:
18mmø = 12 mm Reach
14mmø = 9.5 mm (3/8”)
Reach
Firing End Construction
A:
B:
C:
CM:
E:
ES:
F:
G:
G-G:
GV:
K:
L:
LM:
M:
N:
P:
Q:
R:
S:
T:
U:
V:
VX:
W:
X:
Y:
Z:
Special Design
Special Design
Low Angle
Ground Electrode
Compact type, low angle
ground electrode
V-Grooved center
electrode (14mm only)
1.5mm Insulator
Standard 3/4” Thread Reach
(2.5mm) center electrode
Tapered Seat
Fine wire
nickel alloy center
electrode
Copper core ground electrode
Gold-palladium
center electrode
Special Construction
of V-Type. Racing use
2-Ground electrodes
Half heat range,
(See spec. chart)
Compact type for
Lawn Mower
2-Ground electrodes
For Mazda Rotary Eng.
Special Side electrode
Premium Platinum
4-Ground
electrode
Special Ground
electrode
Standard 2.5mmø
center electrode
3-Ground
electrode
Semi-surface
discharge
Fine wire
gold palladium
center electrode
High performance
platinum
Tungsten
electrode
Booster gap
V-Grooved center
electrode (14mm only)
2.5mm Insulator
Thick 2.9mmø
center electrode
K Spark Plug Codes
D E S I G N S Y M B O L S: SP A R K P L U G S
B
Thread Diameter
A: 18 mm
B: 14 mm
C: 10 mm
D: 12 mm
J: 12 mm
Plug Type
I: Iridium Platinum
L: Thread Reach 26.5mm
P: Premium
Platinum
Z: Extended Gap
Metal Shell Size
F: ø 14, 19mm (3/4”) Reach, 16mm (5/8”) Hex.
G: ø 14, 19mm (3/4”) Reach, 20.6mm (13/16”) Hex.
J: ø 12, 19mm (3/4”) Reach, 19mm Hex.
M: ø 10, 19mm (3/4”) Reach, 16mm (5/8”) Hex.
T: Tapered Seat ø 14, 17.5mm Reach, 16mm (5/8”) Hex.
PTR5A-13: ø 14, 25mm Reach, 16mm (5/8”) Hex.
Construction
R: Resistor
Firing End
Contruction
A, B, C...: Special
Design
Heat Rating
Numbers
2 Hot
11 Cold
Construction
(ONE OR MORE LETTERS
MAY BE COMBINED)
C: Hex Size 5/8”
K: Hex Size 5/8”
Projected Tip (ISO)
M: Compact Type
P: Projected Insulator
Type
R: Resistor Type
Surface or Semi-
U: Surface Discharge
Type
Z: Inductive Resistor
Thread Reach
E: 19 mm (3/4”)
EF: Tapered Seat
17.5 mm (.708” Reach)
FS: Tapered Seat
10.9 mm (.460”)
H: 12.7 mm (1/2”)
EH: Partial thread
19 mm (3/4”Total Reach)
12.7 mm (1/2”Total Thread)
L: 11.2 mm (7/16”)
S: 9.5 mm (3/8”) Reach
Z: 21 mm
NO SYMBOL:
18mmø = 12 mm Reach
14mmø = 9.5 mm (3/8”)
Reach
Firing End Construction
A:
B:
C:
CM:
E:
ES:
F:
G:
G-G:
GV:
K:
L:
LM:
M:
N:
P:
Q:
R:
S:
T:
U:
V:
VX:
W:
X:
Y:
Z:
Special Design
Special Design
Low Angle
Ground Electrode
Compact type, low angle
ground electrode
V-Grooved center
electrode (14mm only)
1.5mm Insulator
Standard 3/4” Thread Reach
(2.5mm) center electrode
Tapered Seat
Fine wire
nickel alloy center
electrode
Copper core ground electrode
Gold-palladium
center electrode
Special Construction
of V-Type. Racing use
2-Ground electrodes
Half heat range,
(See spec. chart)
Compact type for
Lawn Mower
2-Ground electrodes
For Mazda Rotary Eng.
Special Side electrode
Premium Platinum
4-Ground
electrode
Special Ground
electrode
Standard 2.5mmø
center electrode
3-Ground
electrode
Semi-surface
discharge
Fine wire
gold palladium
center electrode
High performance
platinum
Tungsten
electrode
Booster gap
V-Grooved center
electrode (14mm only)
2.5mm Insulator
Thick 2.9mmø
center electrode
WIDE GAP –
8 0.8mm (.032”)
9 0.9mm (.036”)
10 1.0mm (.040”)
11 1.1mm (.044”)
13 1.3mm (.052”)
14 1.4mm (.055”)
15 1.5mm (.060”)
20 2.0mm (.080”)
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