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4140 Alloy Square Bar

Product Description:

4140 Alloy Steel Square Bar is noted for its toughness, good torsional strength and good fatigue strength. Machinability of this alloy is good in the annealed condition. In the heat treated and quenched condition machining is best limited to finish grinding. The 4140 that we offer for sale here on our website is in the Cold Drawn Annealed condition. We can also provide this product in a Normalized or Heat Treated state. Please contact us toll free @ 888-752-7272 if you need help with this. As with all the low alloy steels forming may be done by conventional methods with the alloy in the annealed condition. These alloys have good ductility, but are tougher than plain carbon steel and thus usually require more force, or pressure, for forming. 4140 Alloy Steel is weldable by all of the conventional methods. Note that welding with the alloy in the heat treated condition will affect the mechanical properties and a post weld heat treatment may be needed. Typical applications include Arbors, Axle Shafts, Bolts, Crankshafts, Connection Rods, Chuck Bodies, Collets, Ejector Pins, Forks, Gears, Guide Rods, Hydraulic Shafts & Parts, Lathe Spindles, Milling Spindles, Motor Shafts, Pinions, Pump Shafts, Spindles, Sprockets, Studs, Tool Holders and Torsion Bars.

Click to view Properties
Normalized Tensile Strength 187,200
Normalized Yield Strength 125,000
Normalized Elongation in 2" 11
Normalized Brinell Hardness 388
Annealed Tensile Strength 90,000
Annealed Yield Strength 65,000
Annealed Elongation in 2" 35
Annealed Brinell Hardness 197
Iron (FE) 97.33 - 98.22%
Carbon (C) .38 - .33%
Chromium (Cr) .80 - 1.1%
Manganese (Mn) .75 - 1%
Molybdenum (Mo) .15 - .25%
Phosphorus (P) .035%
Sulphur (S) .040%
Silicon (Si) .15 - .35%

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  1. Alloy Square Bar 4140 Annealed: 1-3/4"
    / ft
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***Based on UPS size limitations, we are only able to process orders for lengths of product that are within UPS size parameters. For now, the maximum allowable length that can be purchased on our website is 8 ft. We are working to add a more complex shipping calculator to the site that will enable us to accurately calculate shipping and provide you with limitless options on your purchases. In the meantime, if you need to purchase an item(s) that are above and beyond 8' in length, we can certainly accommodate this, but for now, you will need to call one of our dedicated sales reps toll free @ 888-752-7272 to complete your order. Thanks!***

***If you do not see the size that you are looking for on our website, have no fear!! We can, in almost all cases, acquire exactly what you need. Please contact one of our dedicated sales representatives, toll free @ 888-752-7272. Our team is very knowledgeable and would be more than happy to help you in any way possible***

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