... :2M Products:Forged Shaft.Steel grade:Carbon steel:Chinese Standard:20#,25#,35#,45#,50#,60#;Japan Standard:S20C,S25C,S35C ... Standard:SAE4140,SAE4130,SAE9840,SAE4340,AISI4145H,SAE4150,SAE8620,Europe Standard:42CrMo4,25CrMo4,34CrNiMo6,39CrNiMo3,17NiCrMo6,18CrNiMo7-6,S355J2G3,ASTM A105,ST52 ... :GB, BS, ASTM, EN, DIN, AISI, JIS Forged Shafts of 42CrMo4/4340