... Housing 2) Aluminium Bronze Worm 3) 8620/20CrNiMo shaft Features:Gearbox, Gear case, Gear, Worm, Worm Shaft, Casting, Sand-Casting1 ... 20CrNiMo7) Heat treatments: carbonization and hardening8) Tooth flank rigidity: up to 60±2HRC9) Tooth flank grinding precision: up to 7 ... Units Produced(Previous Year) Stamping Parts & Machining Parts Product Line Gearbox 1,000 Pieces / Month, Gear & Worm Gear 4, ...