... gearbox, plastic gearbox, plastic extruder gearbox, plastic extrusion machine gearbox, hard tooth gearbox, gearbox for plastic extruder, ... gearbox for plastic extrusion machine, plastic extruder machine, plastic extrusion machinery, plastic extruder, plastic wire ... steels for gear wheel and shaft parts. The gear is treated with carburation, quenching and gear grinding. Gear wheel ...