NGK Spark Plug Codes:
NGK code: [B] [P] [6] [E] [S]
A | 18 mm |
B | 14 mm |
C | 10 mm |
D | 12 mm |
C | Hex size 5/8″ |
K | Hex size 5/8″ with projected tip (ISO) |
M | Compact type |
P | Projected insulator type |
R | Resistor |
SD | Surface discharge for rotary engines |
U | semi-surface discharge |
Z | inductive suppressor |
2 | Hot |
10 | Cold |
E | 19 mm |
F | tapered seat |
H | 12.7 mm (1.5″) |
L | 11.2 mm (7/16″) |
If this field is blank, an 18 mm diameter plug has 12 mm reach; and a 14 mm plug has 9.5 mm (3/8″) reach. |
A,B | Special design (no details given) |
C | special ground electrode |
G | Racing use |
GV | Racing V-type |
H | Half thread |
K | 2 ground electrodes |
L | Half heat range |
LM | Compact lawn mower type |
M | 2 ground electrode for Mazda rotary engine |
N | Special ground electrode |
P | Platinum tip (premium) |
Q | 4 ground electrodes |
R | Delta ground electrode for BMW |
S | Standard 2.6 mm electrode |
T | 3 ground electrodes |
V | Fine-wire electrode, gold-palladium |
VX | Platinum tip (high performance) |
W | Tungsten electrode |
X | Booster gap |
Y< | V-groove centre electrode |
8 | .032″ |
9 | .036″ |
10 | .040″ |
11 | .044″ |
13 | .050″ |
14 | .055″ |
15 | .060″ |
20 | .080″ |