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SCHEDULED MAINTENANCE 2 - 10
Symbols used on the NGK spark plugs
PREFIX
Thread size
length
Compact
Projected
insulator
Resistor type
Superficial
discharge
Resistor/
induction type
SECTIONAL VIEW AND TYPES OF SPARK PLUG GAP
Regular
Spark plug
SUFFIX
Temp.
Rating
HOT
COLD
Spark plug with
Spark plug with
projected insulator
conical seat
Thread Length
Conical
seat
Without symbol
Spark plug with V-
notch central
electrode
GAP WIDTH
Insulator type
Particular
characteristic
One ground electrode,
special alloy
Two ground electrodes,
special alloy
Designed for racing
V-notch central
electrode (racing)
Half-temp rating
Standard central
electrode
Electrode with
precious metal core
Booster gap
V-notch central
electrode
Spark plug with
superficial discharge
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