China factory RV Motovario Double Worm Gearbox car gearbox

Product Description  Product DescriptionMain Materials:1)housing:aluminium alloy ADC12(size 571-090); die cast iron HT200(size 110-150);2)Worm:20Cr, ZI Involute profile; carbonize&quencher heat treatment make gear surface hardness up to 56-62 HRC; After precision...