Gear material: carbon steel, stainless steel, alloy steel, copper (40Cr 40CrMo 20 crmnti 20 crnimo 45 #steel)
https://www.gearfactory.net/product/automobile-gearbox/air-compressor-40065-fifth-gear.html
Gear material: carbon steel, stainless steel, alloy steel, copper (40Cr 40CrMo 20 crmnti 20 crnimo 45 #steel)
https://www.gearfactory.net/product/automobile-gearbox/air-compressor-40065-fifth-gear.html