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Denso Iridium Power IW31: 14 mm thread, 19 mm reach, 20.6 mm hex, heat range 31 (NGK 10), resistor.
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Denso Iridium Power IW31, stock number 5319, the Denso equivalent of the NGK BR10EIX.
Specification: 14 mm thread, 19 mm reach, 20.6 mm (13/16 in) hex, heat range 31 (NGK heat range 10), resistor.
Denso Iridium Power: 0.4 mm iridium centre electrode, U-groove ground electrode, built-in resistor.
Check the plug code in your owner's manual before ordering: thread, reach and heat range have to match.
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Denso is a Japanese manufacturer of automotive and motorcycle components, founded in 1949, and has made spark plugs since 1959. Art of Racing stocks three Denso Iridium Power plugs with a 0.4 mm iridium centre electrode: the IK27 (16 mm hex, heat range 27), the IW24 (20.6 mm hex, heat range 24) and the IW31 (20.6 mm hex, heat range 31). Their NGK equivalents are the BKR9EIX, BR8EIX and BR10EIX.
