| Grade | JIS G4053:2008 SNCM240 / JIS G4053 SNCM240 |
| Standard | JIS G4053:2008 |
| Description | Medium carbon nickel-chromium-molybdenum alloy steel with good strength, toughness and fatigue resistance. Used for crankshafts, high-strength bolts and heavily loaded automotive components. |
| Applications | Nickel-chromium-molybdenum case-hardening (carburizing) steel, higher carbon variant than SNCM220; gears, shafts, and highly stressed transmission components requiring wear-resistant carburized surface and tough core |