DENSO model establishment: (1)-(2)-(3)-(4)
(1) Thread diameter: M-18mm, hexagonal opposite side 25.4mm
W-14mm, Hexagonal opposite side 20.6mm
X-12mm, hex side 18mm
U-10mm, 16mm on opposite sides of hexagon
(2) Calorific value: hot ←-------------------------cold
4, 9, 14, 16, 17, 20, 22, 24, 25, 27, 29, 31, 34, 37
(3) Thread length: E-19mm
F-12.7mm
L-11.2mm
No mark -12mm (φ18mm)/9.5mm (φ14mm)
(4)Spark plugType: P-Insulator protruding type
L-short seat type
S-common type
R- with dampingResistanceType
N-racing type
M-small
UU groove electrode type
? -Other usage and structural features
Example: W24ER means the thread diameter is 14mm, the thread length is 19mm, the calorific value is 24, and the spark plug with damping resistance.
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