4140

UNS #G41400

4140 is a through hardening Chromium-Molybdenum medium Carbon steel which is not subject to temper embrittlement. It possesses good combination of wear, impact and fatigue resistance.

Type Analysis

  • Carbon (Nominal) 0.4
  • Phosphorus (Maximum) 0.04
  • Silicon (Nominal) 0.22
  • Manganese (Nominal) 0.9
  • Sulfur (Maximum) 0.035
  • Chromium (Nominal) 0.95
  • Molybdenum (Nominal) 0.2
  • Iron (Nominal) Balance

Applications

Gears, shafting, axles, fittings, flanges, collets, tooling, fasteners

Applicable Specifications

  • AMS 6349
  • AMS 6381
  • AMS 6382
  • AMS 6390
  • AMS 6395
  • MIL S 5626
  • MIL S 16974
  • MIL S 46059

Rounds

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