... surface extruder gearbox of ZLYJ series for plastic extruderSeries ZLYJ decelerator is a drive with high-precision and hard tooth surface and ... 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 ...