4140 Round Bar Stock

Capital Steel & Wire is a leading supplier of 4140 round bar stock in cold drawn form. 4140 steel is a versitile grade of steel and useful for a variety of applications. Cold finished 4140 round bars will have high hardenability, and good strength and resistnace. 4140 steel is very good for machining applications and will respond well to heat treatment.

4140 is used in machining applications and is used to make various parts including gears, fastners and bolts. To learn more about our current 4140 round bar stock availability give us a call or use the contact form to your right and a Capital Steel & Wire representative will respond shortly. Our experienced staff work with you to make sure that you are getting the right steel product for your end application.

Below you will find chemical and physical properties of 4140 steel.

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

If you have any questions about our distribution or processing capabilities please do not hesitate to contact us. We're here to help!

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