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Identification and Construction

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D First letter of the spark plug part number identifies the spark plug dimensions.
Shell dimensions A B D F G H J K L N P U
Metal shell projected into combustion chamber
  Complies with relevant ISO standard
O Does not comply with relevant ISO standard
R Interference suppression
No interference suppression
R Interference suppression
X Resistor reducing electrode burn-off
15 Heat range
Hot Cold
  19 18 17 16 15 14 12 10 08
L Spark gap design
Not projected insulator tip
Y Projected insulator tip
L Extremely projected insulator tip
T Projected insulator tip and three ground electrodes EXTRA
LG Extremely projected insulator tip and ring-shaped spark gap PREMIUM
Z Two auxiliary electrodes on the insulator tip and ring-shaped electrode gap PREMIUM
TX One auxiliary electrode on the insulator tip and three ground electrodes PREMIUM
LT Extremely projected insulator tip and three ground electrodes EXTRA
C Elektrode material
Nickel-alloy centre electrode
C Copper cored centre electrode SUPER
S Silver centre electrode SILVER
P Centre electrode with platinum contact PLATIN
PP Centre and ground electrode with platinum contact PLATIN
-1 Spark gap
0,4 - 0,9 mm
-05 0,5 mm
-1 1,0 - 1,1 mm
-3 1,3 mm
-X Special

Spark Plug Shell Dimensions

A
B
D
F
G
H


J
K
L
N
P
U

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