4140 Cold Drawn Bar

Capital Steel & Wire is a distributor of 4140 grade cold drawn steel bar stock. With high chromium content, 4140 bars have high hardenability, and the molybdenum content provides high strength and uniformity of hardness. Unlike other grades, the carbon content of 4140 grade steel allows it to hold up well to heat treatment, while having good wear resistance and strength.

With responding well to heat treatment and being moderately easy to machine, 4140 cold finished steel bar is practical and useful for machining applications and for a variety of different parts, including fastners, bolts and gears.

We carry 4140 bar stock in the following shapes:

The following is the chemical and mechanical properties for annealed and normalized 4140 cold drawn steel bar.

4140 Chemical Properties

Carbon 0.38-0.43
Manganese 0.75-1.00
Phosphorus, Max % 0.035
Sulfur, Max % 0.040
Silicon 0.15-0.35
Chromium 0.80-1.10
Molybdenum 0.15-0.25

4140 Mechanical Properties (Annealed)

Tensile Strength 95,000 psi
Yield Strength 60,500 psi
Elongation in 2" 25.7%
Reduction of Area 55.9%
Brinelle Hardness 197

4140 Mechanical Properties (Normalized)

Tensile Strength 148,000 psi
Yield Strength 95,000 psi
Elongation in 2" 17.7%
Reduction of Area 46.8%
Brinelle Hardness 302

Our sales representatives can work with you to provide custom orders based on your business needs. To learn more about our current 4140 cold drawn bar inventory, and to learn more about our distribution and machining capabilities, give us a call at (866) 773-7800 or use the contact form on the right to reach out to a Capital Steel & Wire representative.

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