NipponDenso Spark Plug Chart   Example (note that not all 7 fields will always be used, such as in K20R-U): W 16 E X R -U 11   First box from example (W): THREAD and HEX SIZE Letter Thread Hex Size Description M L MA J* P* S SF W   PQ* Q* QJ* PK* + K* + KJ* + T WA X U U 18mm 18mm 18mm 14mm 14mm 14mm 14mm 14mm   14mm 14mm 14mm 14mm 14mm 14mm 14mm 14mm 12mm 10mm 10mm 1" 7/8" 13/16" 13/16" 13/16" 13/16" 13/16" 13/16" 3/4" 5/8" 5/8" 5/8" 5/8" 5/8" 5/8" 5/8" 5/8" 18.0mm 5/8" 14.0mm     Taper Seat Extended Electrode Platinum Tipped Electrodes Special Surface Gap Surface Gap   For Compact Type Platinum Tipped Electrodes   Extended Electrode Platinum Tipped Electrodes   Extended Electrode Taper Seat Taper Seat (Compact Type)     For Compact Type (U20M-U) * Reach 3/4"     + ISO Std.   Second box from example (16): HEAT RANGE NUMBER HOT   <————————————————>   COLD 9  14  16  20  21*  22  24  25*  27  29*  31  32*  34  37 * Special heat rating number   Third box from example (E): THREAD REACH Letter Reach A   B C E (Flat Seat)   E (Taper Seat) F FE G H L M N (Taper Seat) None     None (Taper Seat)   3/4" and 0.28" Proj Length 0.787" 3/4" and 0.37" Proj Length 3/4" and 0.20" Proj Length 3/4" 0.787" 0.708" 1/2" 3/4" Half Thread 0.858" 3/4" and 0.33" Proj Length 7/16" 0.339" 0.708" Half Thread 15/32" 3/8" 3/4" 0.460" 0.325"   Fourth box from example (X): SPECIAL DESIGN Letter Description A B D K LM M N P S T X 2 ground electrodes for Mazda rotary 3 ground electrodes for Mazda rotary 4 ground electrodes for Mazda rotary Special type for Honda CVCC eng. Compact type (Hex. 13/16") Compact type (Hex. 3/4") Racing type (Retracted insulator and Nickel ground electrodes) Projected tip Non-projected tip 2 ground electrodes Extra projected tip   Fifth box from example (R): INTERNAL CONSTRUCTION Letter Description R None Resistor Standard   Sixth box from example (-U): SPECIAL DESIGN Letter Description -U -Z -GL -V -S -L   -P -US -N With U-Grooved ground electrode Platinum center electrode with taper shaped ground electrode Platinum center electrode Fine wire center electrode Semi-surface gap type Special type for Honda CVCC eng. Extra project type for mopeds A double coating of platinum on the ground electrode Star center electrode with U-Groove ground electrode Special type for Yamaha, Kawasaki   Seventh box from example (11): GAP Number Gap 8 9 10 11 13 14 15 20 0.8mm (0.032") 0.9mm (0.035") 1.0mm (0.040") 1.1mm (0.044") 1.3mm (0.050") 1.4mm (0.055") 1.5mm (0.060") 2.0mm (0.080")

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