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Thread diameter
A = 18mm
B = 14mm
C = 10mm
D = 12mm
BC = 14mm with 16mm hexagon
|
P = Projected insulator nose
U = Surface or semi-surface
discharge
|
R = Resistor
|
Heat Range
2 = Hot
3
4
5
6
7
8
9
10
11
12 = Cold
|
Thread reach
E = 19.0mm
H = 12.7mm
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S = Copper core
Y = V-grooved with extra
projection
V = Gold/palladium centre
electrode
K = 2 ground electrodes
T = 3 ground electrodes
Q = 4 ground electrodes
C = Short ground electrode
P = Platinum tip
F = Taper seat
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Spark gap
9 = 0.9mm
-11 = 1.1mm
-13 = 1.3mm
-L = Half heat range
-N = Special ground electrode
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