B - Taper seat
C - "Bantam" type
D - Тaper seat "Bantam" type
E - Shielded 5/8x24
O - Wire round resistor
Q - Inductive suppressor
R - Resistor
T - Special "Bantam" type
U - Auxiliary gap
X - Resistor
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Thread-Reach
A=12mm-3/4-19mm
C=14mm-3/4-19mm
D=18mm-1/2-12.7mm
F=18mm-.460-11.7mm
G=10mm-3/4-19mm
H=14mm-7/16-11mm
J=14mm-3/8-9.5mm
K=18mm-different
L=14mm-1/2-12.7mm
N=14mm-3/4-19mm
P=12mm-.460-12.5mm
R=12mm-3/4-19mm
S=14mm-.708-18mm
V=14mm-.406-11.7mm
W=7/8x18 different
Y=10mm-1/4-6.3mm
Z=10mm-.492-12.5mm
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A = Conventional
B = Multiple earth electrode
C = Copper cored centre electrode
G = Precious metal centre electrode
J = Cut back earth electrode
R = Racing type electrodes
V = Surface gap
X = Special feature
CC = Copper cored ground electrode
BYC = Copper cored centre electrode and 3 earth electrodes
BMC = Copper cored centre electrode and 2 earth electrodes
PP = Double Platinum
PYC = Projected Single Platinum
PYP = Projected Double Platinum
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4 = 1mm Electrode gap
5 = 1.3mm Electrode gap
6 = 1.5mm Electrode gap
8 = 2mm Electrode gap
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