... gears manufacutuer 2.Delrin,steel,stainless steel,alluminum,bronze 3.Casting steel double spur gear 4.heavy gear rim spur gears ... alloy , brass , gray iron , nodular cast iron , ductile iron specified StandardASTM , AISI , BS , DIN , JIS , NF ProcessInvestment casting , die casting , gravity casting , sand casting MachiningTurning , milling ...