Page 5 - NGK 16-17

Symbols used on spark plugs

P F R 5 A - 11

Unit : mm
P F R 5 A -11
Plug type Thread Thread Seat Hex size Resistor Heat rating Design Spark gap
configuration
diameter
length
DI High ignitability plug: F ∅ 14.0 19.0 Gasket Hex 16.0 R Resistor 2 Hot type A,B,C… None Motorcycle : 0.7∼0.8
Double fine electrodes FE ∅ 14.0 19.0 Gasket Hex 16.0 4 Suffix code Car : 0.8∼0.9
I Double iridium spark plug G ∅ 14.0 19.0 Gasket Hex 20.8 5 -7 0.7
L Long thread reach plug J ∅ 12.0 19.0 Gasket Hex 18.0 6 -9 0.9
P Double platinum spark plug K ∅ 12.0 19.0 Gasket Hex 16.0 7 I Iridium central -10 1.0
electrode
S High ignitability plug : KA ∅ 12.0 19.0 Gasket Hex 14.0 8 -11 1.1
thin square tip type
KB ∅ 12.0 19.0 Gasket Bi-Hex 14.0 9 IX Iridium IX spark plug -13 1.3
(Bi-hexagonal *)
Z Projected firing end 10 Cold type P Platinum central -15 1.5
Above alphabets are occasionally KE ∅ 12.0 19.0 Gasket Hex 16.0 electrode
used in combination KF ∅ 12.0 19.0 Gasket Hex 14.0 * When there is „I“ or „P“ -A Non gasket
<Example>ILFR···, PLZFR···, at the beginning of part
When „L“ is included, priority is KG ∅ 12.0 19.0 Gasket Bi-Hex 14.0 number ( „I“ or „P“ after -D Metal shell : nickel plating
(Bi-hexagonal *)
given to „L“ (long reach)“ in thread heat rating becomes -E Special resistance
length. L ∅ 10.0 12.7 Gasket Hex 16.0 suffix code.) -G Copper cored ground electrode
<Example> <Example>
*Gasket type M ∅ 10.0 19.0 Gasket Hex 16.0 IZFR6P8 is Iridium spark -H Special thread shape
FR5AP : Thread length MA ∅ 10.0 19.0 Gasket Hex 14.0 plug -J 2 ground-electrode
19.0mm MF ∅ 10.0 19.0 Gasket Hex 14.0 I : Iridium -K Vibration-resistance ground
→
LFR5AP-11 : Thread length P : Suffix code electrode
26.5mm NA ∅ 12.0 17.5 Tapered seat Hex 14.0 * <Exception>
T ∅ 14.0 17.5 Tapered seat Hex 16.0 -N Special ground electrode
*Tapered seat type ZFROP-G is nickel spark
PTR5C-13 : Thread length U ∅ 14.0 11.2 Tapered seat Hex 16.0 plug -Q 4-ground-electrode
17.5mm W ∅ 18.0 10.9 Tapered seat Hex 20.8 -S Special gasket
→
PLTR6A-10G : Thread length X ∅ 14.0 9.5 Gasket Hex 20.8 -T 3-ground-electrode
25.0mm
Y ∅ 14.0 11.2 Tapered seat Hex 16.0 -U Semi-surface discharge type
*Exception TR5A-10, TR5A-13, Bi-hexagonal IX-P Iridium MAX plug
TR5B-13, TR6B-10, TR6B-13,
PTR5A-10, PTR5A-13 : LPG LaserLine spark plugs range
Thread length 25.0mm 1-8 for gas engines
*Bi-hexagonal socket is necessary. Hexagonal
*FE, KE, KF, KG, MF : Longer exposed
insulator length type
RE 7 C -L
Plug type Heat rating Design Spark gap
RE Plug for rotary engines 5 Hot type A,B,C···Suffix code -L Leading side
SD Plug for rotary engines 6 -T Trading side
(Semi-surface discharge 7
gap)
RE 7 C - L 8

9
10
11 Cold type
HB 6 A IX -11 P
Plug type Heat rating Thread Thread Seat Hex size Spark gap
configuration
length
diameter
HB HYBD (3-ground-electrode 4 Hot type A ∅ 14.0 20.5 Gasket Hex 16.0 IX -8 0.8
hybrid type)
5 B ∅ 14.0 19.0 Gasket Hex 16.0 -9 0.9

6 -10 1.0
HB 6 A IX - 11 P 7 -11 1.1
8 Cold type -13 1.3
DF 6 H -11 A
Plug type Heat rating Thread Thread Seat Hex size Spark gap
diameter
configuration
length
DF High ignitability plug 4 Hot type A ∅ 14.0 19.0 Gasket Hex 16.0 -8 0.8 A,B,C…
(Double fine electrodes) Suffix code
5 B ∅ 14.0 26.5 Gasket Hex 16.0 -9 0.9
DFH High ignitability plug 6 C ∅ 12.0 26.5 Gasket Hex 14.0 -10 1.0
DF 6 H - 11 A (DF + Hybrid type) 7 *DF6H-11A : Thread length 28.0mm -11 1.1
8 -13 1.3
9 Cold type -15 1.5
GB 3
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