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CONTENTS
Find Your Plugs
Reference
Part Number Chart
IRIDIUM POWER
Features
Structure
Linenup
Specifications
IRIDIUM TOUGH
Features
Structure
Linenup
Specifications
IRIDIUM PLUS
Features
Specifications
IRIDIUM POWER
Features
Structure
Linenup
Specifications
Basic_Knowledge
Plugs Configrations
 Plugs Specifications
Q & A
IRIDIUM POWER Q&A
IRIDIUM TOUGH Q&A
TECH Q&A
 Sales Companies
Cross Reference
Plugs Specifications
IDENTIFYING DENSO PLUGS Iridium Plugs / Platinum Plugs / Normal Plugs

Gap Shape Internal Construction Shape Reach Heat Range Thread Diameter and Hex Size
Thread Diameter and Hex Size
< Thread Diameter x Hex Size > (mm)
M --- 18 x 25.4 (Reach: 12mm)
L --- 18 x 22.2 (Reach: 12mm)
MW --- 18 x 20.6 (Reach: 12mm)
MA --- 18 x 20.6 (Tapered seat, Reach: 12mm)
FK+ --- High Ignitability Plug (0.55mm Ir center electrode, Pt ground electrode)
J* --- 14 x 20.6 (Projected plug)
K+ --- 14 x 16.0 (Miniature plug)
KJ*+ --- 14 x 16.0 (Projected miniature plug)
LP* --- 14 x 20.6 (Plug for LPG applications)
P* --- 14 x 20.6 (Platinum plug)
PK* --- 14 x 16 (Miniature platinum plug)
PKJ* --- 14 x 16 (Projected miniature platinum plug)
PQ* --- 14 x 16 (Miniature platinum plug)
Q* --- 14 x 16 (Miniature plug)
QJ* --- 14 x 16.0 (Miniature projected plug)
QL* --- 14 x 20.6 (Miniature long cylinder housing plug)
S* --- 14 x 20.6 (0.7mm diameter iridium)
S --- 14 x 20.6 (Surface gap plug (for RE engines))
SK+ --- 14 x 16 (0.7mm diameter miniature iridium plug)
SKJ*+ --- 14 x 16 (Projected 0.7mm diameter miniature iridium plug)
SV --- 0.4mm diameter iridium with platinum ground electrode
T --- 14 x 16.0 (Tapered seat)
TR@ --- 14 x 20.6 (For marine applications)
W --- 14 x 20.6
  --- 14 x 19.0 (Compact type)
X --- 12 x 18.0
XE --- 12 x 14.0
XU --- 12 x 16.0
U --- 10 x 16.0
U --- 10 x 14.0 (U20M-U Only)
N --- 10 x 16.0
Y --- 8 x 13.0
Z --- 1/2PF x 23.8
Z --- 0.55 mm diameter iridium
* --- Reach: 19.0
+ --- ISO compatible
@ ---Reach: 12.7

Heat Range
DENSO NGK CHAMPION BOSCH
9 2 18 10
14 4 16,14 9
16 5 12,11 8
20 6 10,9 7,6
22 7 8,7 5
24 8 6,63,61 4
27 9 4,59 3
29 9.5 57  
31 10 55 2
32 10.5 53  
34 11    
35 11.5    

Reach
A --- 19mm
(Electrode position: 7mm)
  --- 21.5mm
B --- 19.0mm
(Electrode position: 9.5mm)
C --- 19.0mm
(Electrode position: 5.0mm)
D --- 19.0mm (Shroud: 2mm)
E (With gasket) --- 19.0mm
20.0mm
E (Taper seat) --- 17.5mm
F --- 12.7mm
FE --- 19.0mm (Half thread)
G --- 19.0mm (Shroud: 2.8mm)
  --- 19.0mm (Shroud: 3.0mm)
H --- 19.0mm
(Electrode position: 8.5mm)
  --- 26.5mm
L --- 11.2mm
M --- 8.6mm
N
(Taper seat,
HALF THREAD)
--- 17.5mm
V
(Tapered seat)
--- 25.0mm
None --- 9.5mm
11.2mm
19.0mm
21.5mm
None (Tapered seat) --- 8.3mm
11.2mm
11.2mm

Shape (Type)
A --- Double ground electrodes
A --- Oblique ground electrode (For racing)
AY --- Double ground electrodes with bent shape (special)
B --- Triple ground electrodes
BG --- Triple ground electrodes (shrouded)
D --- Quadruple ground electrodes
K --- 1mm Insulator projection
LM --- Compact type (Hex size: 20.6mm)
M --- Shortened insulator head length
M --- Compact type (Hex Size: 19.0mm)
N --- Racing type (Nickel electrode)
Pt --- Racing type (Platinum electrodes)
P --- Projected (1.5mm projection)
S --- Non-projected (0mm projection)
  --- Iridium on a single side
T --- Double ground electrodes
TM --- Double ground electrodes
TN --- Double ground electrodes
V --- Slant ground electrode
X --- Fully projected (2.5mm projection)

Internal Construction
R --- With Resistor
None --- Without Resistor

< Exception >
S29A, S29 both have Resistors

Shape (Type)
-A --- Special specification
-B --- Special specification
-C --- Cut-back ground electrode
-E --- Special specification
-F --- Special specification
-G --- Grease applied on to threads, for CNG applications
-GL --- Platinum center electrode
-L --- For CVCC, with a withdrawn insulator
  --- 3.5mm projected insulator for motorcycles
  --- Withdrawn insulator for motorcycles
  --- Thin center electrode for motorcycles
  --- Heat resistant ground electrode
-M --- Larger ground electrode
-N --- For Yamaha and Kawasaki
-P --- Ground electrode has a double layer of platinum
  --- Center or ground electrode has platinum
-S --- Semi-surface gap discharge type
-S --- Stainless gasket
-TP --- Platinum on center electrode, with taper cut ground electrode
-U --- U-cut ground electrode
-US --- Star-shaped center electrode is used
-V --- 1.3mm diameter nickel center electrode
-Z --- Taper cut
-ZU --- ZU Plug

Gap
5 --- 0.5mm (.020'')
8 --- 0.8mm (.032'')
9 --- 0.9mm (.035'')
10 --- 1.0mm (.040'')
11 --- 1.1mm (.044'')
13 --- 1.3mm (.050'')
14 --- 1.4mm (.055'')
15 --- 1.5mm (.060'')
20 --- 2.0mm (.080'')

< None > Cars: 0.8mm M.C: 0.7mm
< Exceptions > P16R, PQ16R, PQ20R are 1.1mm




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