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4140 is a chromium, molybdenum, manganese containing low alloy steel. Its known for its high fatigue strength and its impact and abrasion resistance. It also contains a high toughness and torsional strength.

Component Element Properties Percent
Iron 96.785 – 97.77%
Chromium .8 – 1.1%
Manganese .75 – 1%
Carbon .38 – .43%
Silicon .15 – .30%
Molybdenum .15 – .25%
Sulfur .04%
Phosphorous .035%

Select AMS Number:

AMS Number Alloy Type UNS Cross Ref. Spec Misc./Shape
AMS 6349
 4140 Steel G41400 MIL-S-5626 Bar 4140
AMS 6381
 4140 Steel G41400 - Tubing 4140
AMS 6382 4140 Steel G41400  
AMS 6382 Bar 4140 Steel G41400 MIL-S-5626 Bar AMS 6382 Bar
AMS 6382 Forging 4140 Steel G41400 MIL-S-5626 Forging AMS 6382 Forging
AMS 6382 Ring 4140 Steel G41400 MIL-S-5626 Ring AMS 6382 Ring
AMS 6390
 4140 Steel G41400 - Tubing 4140
AMS 6395 4140 Steel G41400  
AMS 6395 Plate 4140 Steel G41400 - Plate AMS 6395 Plate
AMS 6395 Sheet 4140 Steel G41400 - Sheet AMS 6395 Sheet
AMS 6395 Strip 4140 Steel G41400 - Strip AMS 6395 Strip
AMS 6452
 4140 Steel G41400 MIL-R-5632 Wire 4140
AMS 6457
 4140 Steel K13147 - Wire 4140
AMS 6529
 4140 Steel G41400 - Bar 4140