Bearing SteelsAMS 6440/6444 (4340)

Low alloy steel used in the aerospace and defence industries.

4340 VAC AMS 6414 is a low alloy steel, maintaining high strength when heated. Typical applications of 4340 AMS 6414 include the aerospace and defense industries for structural use, including aircraft landing gear and power transmission gears. It offers good machinability in the normal, annealed or tempered conditions.

The high fatigue strength makes this alloy ideal for highly stress parts due to it's ability to maintain it's strength and hardness at increased temperatures.

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Related Specifications

  • AMS 6414
  • AMS 6415


Chemical Composition


  • Heavy machinery, specifically for the manufacturing of transmission parts, such as heavy-duty shafts, gears, and axles
  • Ground vehicles and military aircraft
  • Commercial aircraft industry (landing gear)
  • Rocket motor cases
  • Pressure vessels
  • Fasteners


  • Excellent tensile strength, toughness & fatigue resistance
  • Additional heat treatments can produce parts with even high strength & fatigue resistance
  • Wear-resistant material Good abrasion resistance, shock and impact resistance
  • Excellent atmospheric corrosion resistance
  • Very good ductility, especially in the annealed condition, where it can be easily formed and machined

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