Page 7 - Catalog spare parts NGK for cars

Auto Parts / Symbols used on spark plugs

The standard symbols are shown here. In addition, several special designations are used.

Thread dimensions /
Plug Type
Hex. size
D High ignitability plug :
KA Ø12.0 19.0mm Dichtring 14,0
Double fine electrodes
I Iridium spark plug KB Ø12.0 19.0 mm Gasket Bi-Hex 14.0
L Long thread reach plug MA Ø10.0 19.0 mm Gasket 14,0
P Platinum spark plug NA Ø12.0 17.5 mm Tapered-seat 14,0
S High ignitability plug :
F Ø14.0 19.0 mm Gasket 16,0
Square tip type
Z Extended Gap G Ø14.0 19.0 mm Gasket 20,8
Above alphabets are occasionally J Ø12.0 19.0 mm Gasket 18,0
used in combination. K Ø12.0 19.0 mm Gasket 16,0
Ex. ILFR…, PLZFR… L Ø10.0 12.7 mm Gasket 16,0
"L", long thread reach, is prior to other M Ø10.0 19.0 mm Gasket 16,0
letters which stand for T Ø14.0 17.5 mm Tapered-seat 16,0
thread reach. U Ø14.0 11.2 mm Tapered-seat 16,0
Ex. W Ø18.0 10.9 mm Tapered-seat 20,8
• Gasket type X Ø14.0 9.5 mm Gasket 20,8
FR5AP-11;reach 19.0mm Y Ø14.0 11.2 mm Tapered-seat 16,0
LFR5AP-11;reach 26.5mm
• Tapered-seat type
PTR5C-13;reach 17.5mm
PLTR6A-10G;reach 25.0mm

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PF R 5 A 11

Resistor Heat Rating Design Spark gap

R Resistor 2 Hot type A,B,C… None motorcycle:0.7-0.8mm
Suffix code car:0.8-0.9mm
4 - 7 0.7mm
5 - 9 0.9mm
6 I One-side Iridium spark plug -10 1.0mm
7 P One-side Platinum spark plug -11 1.1mm
8 -13 1.3mm
9 -14 1.4mm
10 Cold type -15 1.5mm

-A Non gasket
-D Metal shell plating spec change
-E Special resistance
-G Copper core ground electrode
-H Special thread type
-J 2-ground-electrode
-K Vibration-resistant ground electrode
-N Special ground electrode
-Q 4-ground-electrode
-S Special gasket
-T 3-ground-electrode

GB 5

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