... ~4000diameter 3.Standard:ISO,ASTM,JIS,DIN,BS Stainless Worm Gear ISO9001:2000 system certifiedStandard: ISO, ASTM JIS, DIN, ... abrasion and corrosion resistance&hardnessOEM service offered and Various CNC machiningHigh quality,reasonable price,considerate service.... Production way: ... , Cast metal part, Copper fitting, Copper nut, Bushing, Gear, Worm and Worm Wheel,Copper bushing and all non-ferrous ...