A7TC Replacement C7HSA: Product type Dimendions(mm) Common suitable models Bosheng NGK A7TC C7HSA Size:M10*1 Reach:12.7MM Hex:16MM Gap:0.6MM R(resistor) C(copper core electrode) JH70\JH90\QT125\JS110\GB125T\GY6-125XDZ125\SJ110\CL125-2\DY90\DY100\WY125LZ\JD90\SRC100\CD125T 139Fgas engine Features:1.Multi-ribs of insulator prevent flashover. 2.Insulator made of 95% pure alumina ,srrong resistant to heat shock,great mechanic,and electric features,super insulation. 3.Nickel plated housing prevents oxidation and corrosion ,heat crimping process ensures absolute gas-tight fit. 4.The inner sealing adopts glass sealing material with resistor ,not only ensures the conductivity and sealing but also ensures the spark plug be resrained from the wireless interfere ,so that the spark plug is environment-protection. 5.Multi-layer gaskets are elasticly strong,and reliable in sealing. 6.Copper core electrode prevents oxidation and corrosion ,good electric and heat conductivity,long spark plug service life.