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About Steel
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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.
Highly Fatigue-Resistant 4340 Alloy Steel Rods
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Made of 4340 alloy steel, these rods hold up to high heat, hard impacts, and heavy wear thanks to high levels of nickel, chromium, and molybdenum. They’re commonly used for high‑stress components such as shafts, gears, and other load‑bearing parts. For even more wear resistance, you can harden the surface with heat treating.
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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 | 2 ft. Long | 3 ft. Long | 6 ft. Long | ||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 1/2" | -0.009" to 0.009" | Cold Rolled | Annealed | 68,000 | Rockwell C20 (Hard) | Not Rated | SAE AMS6415 | 4437T11 | — | 00000 | — | 000000 | 000000 | |
| 3/4" | -0.009" to 0.009" | Cold Rolled | Annealed | 68,000 | Rockwell C20 (Hard) | Not Rated | SAE AMS6415 | 4437T12 | — | 00000 | — | 00000 | 00000 | |
| 7/8" | -0.009" to 0.009" | Cold Rolled | Annealed | 68,000 | Rockwell C20 (Hard) | Not Rated | SAE AMS6415 | 4437T13 | — | 00000 | — | 00000 | 000000 | |
| 1" | -0.009" to 0.009" | Hot Rolled | Annealed | 68,000 | Rockwell C20 (Hard) | Not Rated | SAE AMS6415 | 4437T14 | — | 00000 | 000000 | 00000 | 000000 | |
| 1 1/8" | -0.016" to 0.016" | Hot Rolled | Annealed | 68,000 | Rockwell C20 (Hard) | Not Rated | SAE AMS6415 | 4437T15 | 000000 | 00000 | 00000 | 00000 | 000000 | |
| 1 1/4" | -0.016" to 0.016" | Hot Rolled | Annealed | 68,000 | Rockwell C20 (Hard) | Not Rated | SAE AMS6415 | 4437T16 | 00000 | 00000 | 00000 | 000000 | 000000 | |
| 1 1/2" | -0.016" to 0.016" | Hot Rolled | Annealed | 68,000 | Rockwell C20 (Hard) | Not Rated | SAE AMS6415 | 4437T17 | 00000 | 00000 | 00000 | 000000 | 000000 | |
| 1 5/8" | -0.016" to 0.016" | Hot Rolled | Annealed | 68,000 | Rockwell C20 (Hard) | Not Rated | SAE AMS6415 | 4437T611 | 00000 | 00000 | 000000 | 000000 | 000000 | |
| 1 3/4" | -0.016" to 0.016" | Hot Rolled | Annealed | 68,000 | Rockwell C20 (Hard) | Not Rated | SAE AMS6415 | 4437T18 | 00000 | 00000 | 000000 | 000000 | 000000 | |
| 2" | -0.016" to 0.016" | Hot Rolled | Annealed | 68,000 | Rockwell C20 (Hard) | Not Rated | SAE AMS6415 | 4437T21 | 00000 | 00000 | 000000 | 000000 | 000000 | |
| 2 1/4" | 0" to 0.047" | Hot Rolled | Annealed | 68,000 | Rockwell C20 (Hard) | Not Rated | SAE AMS6415 | 4437T22 | 00000 | 000000 | 000000 | 000000 | 000000 | |
| 2 1/2" | 0" to 0.047" | Hot Rolled | Annealed | 68,000 | Rockwell C20 (Hard) | Not Rated | SAE AMS6415 | 4437T23 | 00000 | 000000 | 000000 | 000000 | 000000 | |
| 2 5/8" | 0" to 0.047" | Hot Rolled | Annealed | 68,000 | Rockwell C20 (Hard) | Not Rated | SAE AMS6415 | 4437T612 | — | 000000 | 000000 | 000000 | — | |
| 2 3/4" | 0" to 0.047" | Hot Rolled | Annealed | 68,000 | Rockwell C20 (Hard) | Not Rated | SAE AMS6415 | 4437T24 | 000000 | 000000 | 000000 | 000000 | 000000 | |
| 3" | 0" to 0.047" | Hot Rolled | Annealed | 68,000 | Rockwell C20 (Hard) | Not Rated | SAE AMS6415 | 4437T25 | 000000 | 000000 | 000000 | 000000 | 000000 | |
| 3 1/4" | 0" to 0.047" | Hot Rolled | Annealed | 68,000 | Rockwell C20 (Hard) | Not Rated | SAE AMS6415 | 4437T613 | 000000 | 000000 | 000000 | 000000 | — | |
| 3 1/2" | 0" to 0.047" | Hot Rolled | Annealed | 68,000 | Rockwell C20 (Hard) | Not Rated | SAE AMS6415 | 4437T614 | 000000 | 000000 | 000000 | 000000 | — | |
| 3 3/4" | 0" to 0.063" | Hot Rolled | Annealed | 68,000 | Rockwell C20 (Hard) | Not Rated | SAE AMS6415 | 4437T615 | 000000 | 000000 | 000000 | 000000 | 000000 | |
| 4" | 0" to 0.063" | Hot Rolled | Annealed | 68,000 | Rockwell C20 (Hard) | Not Rated | SAE AMS6415 | 4437T616 | 000000 | 000000 | 000000 | 000000 | 000000 | |
| 4 1/4" | 0" to 0.063" | Hot Rolled | Annealed | 68,000 | Rockwell C20 (Hard) | Not Rated | SAE AMS6415 | 4437T617 | 000000 | 000000 | — | 000000 | — | |
| 4 1/2" | 0" to 0.063" | Hot Rolled | Annealed | 68,000 | Rockwell C20 (Hard) | Not Rated | SAE AMS6415 | 4437T618 | 000000 | 000000 | 000000 | 000000 | — | |
| 4 3/4" | 0" to 0.079" | Hot Rolled | Annealed | 68,000 | Rockwell C20 (Hard) | Not Rated | SAE AMS6415 | 4437T619 | 000000 | 000000 | 000000 | — | — | |
| 5" | 0" to 0.079" | Hot Rolled | Annealed | 68,000 | Rockwell C20 (Hard) | Not Rated | SAE AMS6415 | 4437T621 | 000000 | 000000 | 000000 | — | — | |
| 6" | 0" to 0.125" | Hot Rolled | Annealed | 68,000 | Rockwell C20 (Hard) | Not Rated | SAE AMS6415 | 4437T622 | 000000 | 000000 | — | 000000 | — |
