10 Common Applications for 4140 Steel

SAE 4140 steel is widely used in many industrial fields for its strength and versatility, and therefore is important to know about if you are considering using it in your facility. Here is an outline of its key characteristics and most common applications.

What is SAE 4140 Steel?

SAE 4140 steel is a low-alloy steel containing chromium and molybdenum as strengthening agents. These give great corrosion resistance and strength up to around 600°. These characteristics include high strength and good machinability that can easily be heat treated for increased hardness.

4140 Steel Composition

Chromium, Cr 0.80 – 1.10
Manganese, Mn 0.75 – 1.0
Carbon, C 0.380 – 0.430
Silicon, Si 0.15 – 0.30
Molybdenum, Mo 0.15 – 0.25
Sulfur, S 0.040
Phosphorous, P 0.035
Iron, Fe Balance

What are common 4140 Steel applications?

Cylinder Barrel
Chrome Rod
Crankshafts
Bolts/Nuts
Gears
Milling spindles
Collars
Hydraulic cylinder
Steel conveyor and roll
Fixtures