Forging Parts, Industrial Machinery Parts, Casting & Forging manufacturer / supplier in China, offering Precision Machined Polished Forged Steel Ring ASTM 4340 DIN 34CrNiMo6 JIS Sncm439 for Heavy Machinery Bearing Connection Parts, Custom Forged Involute Spline Sleeve with Oil Hole ASTM 4140 DIN 42CrMo4 JIS Scm440 GOST with Lubrication Hole, Long Type Forged Alloy Internal Spline Sleeve Bushing ASTM 4130 DIN 25crmo4 JIS Scm430 Custom CNC Machining and so on.