... ZBJ19009-88, featured with high-strength alloy steels for gear wheel and shaft parts. The gear is treated with carburation, quenching ... and gear grinding. Gear wheel precision is GB10095-88, class 6. Tooth surface hardness is ... assemblage mode respectivelyExample of earmark: ZLYJ 225-- 12.5 -- (,) ZLYJ series 133, 146, 173, 200, 225, 250, 280, 315, 330 are ...