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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%