Page 4 - NGK 16-17

Symbols used on spark plugs

B P R 5 E S - 11

Unit : mm
B P R 5 E S -11
Thread Hex size Structure Resistor Heat rating Thread length Design features Spark gap
size
A ∅ 18.0 Hex 25.4 P Projected R Resistor 2 Hot type E 19.0 B Integral terminal (CR8EB) None Motorcycle :
B ∅ 14.0 Hex 20.8 insulator type Z Inductive 4 EF 17.5 CM Slant ground electrode 0.7∼0.8
resistor type Compact type (Exposed Car :
BC ∅ 14.0 Hex 16.0 M Small spark plug 5 EH 19.0 half-thread insulator length: 18.5) 0.8∼0.9
BK ∅ 14.0 Hex 16.0 6 H 12.7 CS Slant ground electrode -8 0.8
C ∅ 10.0 Hex 16.0 U Surface gap, 7 L 11.2 G,GV Racing spark plug -9 0.9
Semi-surface
D ∅ 12.0 Hex 18.0 discharge gap or 8 I Iridium central electrode -10 1.0
DC ∅ 12.0 Hex 16.0 Supplementary 9 None Tapered seat type IX Iridium IX spark plug -11 1.1
gap A(P)-F : 10.9
E ∅ 8.0 Hex 13.0 10 Cold type B(P)-F : 11.2 J 2-projecting-ground electrodes -13 1.3
BM(P)-F : 7.8
*Exception K 2-ground-electrodes -15 1.5
B(P)M-A,Y : ∅ 14.0, Hex 19.0 Small type plug -LM Compact type (Insulator length: 14.5)
P(P)--(E)F : ∅ 14.0, Hex 16.0 B(P)M- : 9.5
CM-6 : ∅ 10.0, Hex 14.0 B-LM : 9.5 N Special ground electrode -S Special gasket
BC : Old JIS standard size CM- : 9.5 P Platinum spark plug -E Special resistance
CM-6 : 8.6
The length from gasket C-50 : 8.5 Single ground electrode : IX-P Iridium MAX plug
circuit to terminal contact Double platinum
is 53.0mm. LPG LaserLine
Multi-ground electrode : 1-8 spark plug range
BK : ISO / JIS standard size Single platinum in for gas engine use
The length from gasket central electrode
circuit to terminal contact
is 50.5mm. Q 4-ground-electrodes
S Standard type
T 3-ground-electrodes
U Semi-surface discharge gap
Y V-grooved center electrode
Z Special design

Exposed insulated length

Hex nut

Thread length (Reach)

Spark gap

Thread diameter

GB 2

Katalog_Vorlaufseiten_Reihenfolge_rz.indd 2 04.05.16 09:59