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How to Decode DENSO Spark Plug Numbers

Here’s how to decode the Denso part numbers on our most popular spark plug. W16EXR-U11

Example: SK20HR11

S: 0.7 mm diameter iridium.

K: 14×16.0 (ISO Small Hex plug)

20: heat range.

H: 19.0 mm (Electrode position: 8.5 mm) 26.5 mm L 11.2 mm

R: With resistor

11: .2 mm gap

S Type of precious metalF Center: 0.55 mm diameter iridium. Ground electrode: 0.7 mm diameter platinum
P Platinum plug
S 0.7 mm diameter iridium
SV 0.4 mm diameter iridium
Z 0.55 mm diameter iridium
W K Thread Diameter and Hex SizeC 12×14.0
L 18×22.2 (Reach: 12 mm)
M 18×25.4 (Reach: 12 mm)
MA 18×20.6 (Tapered seat, Reach: 12 mm)
MW 18×20.6 (Reach: 12 mm)
J 14×20.6 (Projected plug)
K 14×16.0 (ISO Small Hex plug)
KJ 14×16.0 (ISO Projected Small Hex plug)
LP 14×20.6 (Plug for LPG applications)
N 10x 16.0
Q 14×16.0 (Small Hex plug)
QJ 14×16.0 (Projected Small Hex plug)
QL 14×20.6 (Small Hex long housing plug)
S 14×20.6 (Surface gap or Rotary)
T 14×16.0 (Tapered seat)
TR 14×20.6 (For marine applications)
W 14×20.6, 14×19.0 (Compact type)
X 12×18.0
XE 12×14.0
XU 12×16.0
U 10×16.0
Y 8×13.0
Z 1/2PFx23.8
16 20 Heat RangeDenso
9
14
16
20
22
24
27
29
31
32
34
35
NGK
2
4
5
6
7
8
9
9.5
10
10.5
11
11.5
Champion
18
16, 14
12, 11
10, 9
8, 7
6, 63, 61
4, 59
57
55
53
Bosch
10
9
8
7, 6
5
4
3
2
E ReachA 19.0 mm (Electrode Position: 7 mm)
21.5mm
B 19.0 mm (Electrode Position: 9.5 mm)
C 19.0 mm (Electrode Position: 5.0 mm)
D 19.0 mm (Shroud 2)
E (With Gasket) 19.0 mm 20.0 mm
E (Tapered Seat) 19.0 mm
F 12.7 mm
FE 19.0 mm (Half thread)
G 19.0 mm (Shroud 2.8) 19.0 mm (Shroud 3.0)
H 19.0 mm (Electrode position: 8.5 mm) 26.5 mm L 11.2 mm
M 8.6 mm
N (Taper seat, Half thread)17.5 mm
V (Tapered seat) 25.0 mm
None 9.5 mm 11.2 mm 19.0 mm 21.5 mm
None (Tapered seat) 8.3 mm 11.2 mm
XR PR Shape (Type)A Double ground electrodes
A Sland G.E. (For racing)
AY Double ground electrodes with bent shape (special) B Triple ground electrodes
BG Triple G.E. (shrouded)
D Quadruple G.E. Projected (2.0 mm projection) Projected (1.5 mm projection, spark position 3.5 mm)
E Shroud: 25
K Projected(1 mm projection)
LM Compact type (Hex Size: 20.6 mm)
M Shortened insulator head length
M Compact type (Hex Size 19.0 mm)
P Projected (1.5 mm projection)
R With resistor
S Non-projected (0mm projection)Single iridium T Double ground electrodes
TM Double ground electrodes
TN Double ground electrodes
V Slant ground electrodes
X Full projected(2.5 mm Projection)
-U -A Shape (Type)-A Specialty Specification
-B Specialty Specification
-C Cut-back G.E
-E Specialty Specification
-F Specialty Specification
-G Grease applied on to threads, for CNG applications -GL Platinum C.E.
-L Heat resistant G.E. Thin center electrode 3.5 mm projected insulator for motorcycles Retracted insulator formotorcycles
-M Larger G.E.
-N For Yamaha and Kawasaki
-P A double layer of platinum G.E. Single platinum -R 10K ohm resister plug
-S Semi-surface gap discharge type
-S Stainless gasket
-TP Taper-cut, single platium plug
-U U-Groove G.E
-US Star-shaped C.E
-V 1.3 mm diameter, nickel C.E.
-Z Taper cut
-ZU ZU plug
11 11  ReachA 19.0 mm (Electrode Position: 7 mm) 21.5mm B 19.0 mm (Electrode Position: 9.5 mm)
C 19.0 mm (Electrode Position: 5.0 mm)
D 19.0 mm (Shroud 2)
E (With Gasket) 19.0 mm 20.0 mm
E (Tapered Seat) 19.0 mm
F 12.7 mm
FE 19.0 mm (Half thread)
G 19.0 mm (Shroud 2.8) 19.0 mm (Shroud 3.0) H 19.0 mm (Electrode position: 8.5 mm) 26.5 mm L 11.2 mm
M 8.6 mm
N (Taper seat, Half thread) 17.5 mm
V (Tapered seat) 25.0 mm
None 9.5 mm 11.2 mm 19.0 mm 21.5 mm
None (Tapered seat) 8.3 mm 11.2 mm<
I Plug TypeA Double ground electrodes
A Sland G.E. (For racing)
AY Double ground electrodes with bent shape (special) B Triple ground electrodes
BG Triple G.E. (shrouded)
D Quadruple G.E. Projected (2.0 mm projection) Projected (1.5 mm projection, spark position 3.5 mm)
E Shroud: 25
K Projected (1 mm projection)
LM Compact type (Hex Size: 20.6 mm)
M Shortened insulator head length
M Compact type (Hex Size 19.0 mm)
P Projected (1.5 mm projection)
R With resistor
S Non-projected (0mm projection) Single iridium T Double ground electrodes
TM Double ground electrodes
TN Double ground electrodes
V Slant ground electrodes
X Full projected (2.5 mm Projection)
U Thread Diameter and Hex Size-A Specialty Specification
-B Specialty Specification
-C Cut-back G.E
-E Specialty Specification
-F Specialty Specification
-G Grease applied on to threads, for CNG applications -GL Platinum C.E.
-L Heat resistant G.E. Thin center electrode 3.5 mm projected insulator for motorcycles Retracted insulator for motorcycles
-M Larger G.E.
-N For Yamaha and Kawasaki
-P A double layer of platinum G.E. Single platinum -R 10K ohm resister plug
-S Semi-surface gap discharge type
-S Stainless gasket
-TP Taper-cut, single platinum plug
-U U-Groove G.E.
-US Star-shaped C.E.
-V 1.3 mm diameter, nickel C.E.
-Z Taper cut
-ZU ZU plug
27  Heat RangeDenso 16
20
22
24
27
29
31
32
34
35
NGK
12, 11
10, 9
8, 7
6, 63, 61
4, 59
57
55
53
Champion
5
6
7
8
9
9.5
Bosch
10
10.5
11
11.5 10
9
8
7, 6
5
4
3
2
A Special Design A Slant electrode, No U-Groove, No taper cut
B Projected insulator (1.5mm)
C No U-Groove
D No U-Groove, Inconel ground electrode
ES Stainless steel gasket
F Special
G Stainless steel gasket
J Spark position: 5 mm
K Spark position: 4 mm
L Spark position: 5 mm
M Spark position: 4 mm, for LPG applications
T For LPG applications
Y 0.8 mm gap
Z Taper cut
TT Twin-Tip

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