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Compare over 50 grades of steel and cast iron to find the right material for you—all with material certificates for traceability.
Ultra-Fatigue-Resistant 300M Alloy Steel Rods
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A modified version of 4340 alloy steel, this 300M alloy steel combines high yield strength with extreme resistance to cracking. It’s often used to create parts that require both, such as torsion bars and drive shafts. This alloy steel has been heat treated to relieve internal stresses, making it easier to machine. Additional heat treatment can be applied to harden the surface and make it more wear resistant.
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Certificates with a traceable lot number are available for these products. Download certificates from ORDER HISTORY after your order ships.
Dia. | Dia. Tolerance | Fabrication | Heat Treatment | Yield Strength, psi | Hardness | Max. Hardness After Heat Treatment | Specs. Met | 1/2 ft. Long | 1 ft. Long | 3 ft. Long | ||
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 1/2" | -0.002" to 0.002" | Hot Rolled | Normalized | 100,000 | Rockwell C25 (Hard) | Rockwell C54 | ASTM A579 | 3236T21 | 000000 | 000000 | 000000 | |
| 3/4" | 0" to 0.016" | Hot Rolled | Normalized | 100,000 | Rockwell C25 (Hard) | Rockwell C54 | ASTM A579 | 3236T22 | 00000 | 00000 | 000000 | |
| 7/8" | 0" to 0.016" | Hot Rolled | Normalized | 100,000 | Rockwell C25 (Hard) | Rockwell C54 | ASTM A579 | 3236T23 | 00000 | 00000 | 000000 | |
| 1" | 0" to 0.016" | Hot Rolled | Normalized | 100,000 | Rockwell C25 (Hard) | Rockwell C54 | ASTM A579 | 3236T24 | 00000 | 00000 | 000000 | |
| 1 1/2" | 0" to 0.016" | Hot Rolled | Normalized | 100,000 | Rockwell C25 (Hard) | Rockwell C54 | ASTM A579 | 3236T25 | 00000 | 000000 | 000000 | |
| 2" | 0" to 0.016" | Hot Rolled | Normalized | 100,000 | Rockwell C25 (Hard) | Rockwell C54 | ASTM A579 | 3236T26 | 000000 | 000000 | 000000 |
