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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.
Low-Carbon Steel Round Tubes
Also known as mild steel, low-carbon steel is easy to machine, form, and weld. It's widely fabricated into parts that don’t require high strength, such as frames, supports, and conduit. This steel is manufactured to ASTM, SAE, or EN standards for quality and performance.
Seamless tubes are stronger than welded tubes.
Heat treatable tubes can be surface hardened. Tubes that are stress relieved minimize warping during machining.
Tubes
| OD | ID | Yield Strength, psi  | Fabrication | Heat Treatable | Hardness | Specifications Met | 1/2 ft. Lg. | 1 ft. Lg. | 3 ft. Lg. | 6 ft. Lg. | |
1/2" Wall Thick. | |||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|
| 1 1/2" | 1/2" | 65,000 | Seamless | No | Rockwell B86 (Medium) | ASTM A519 | 0000000 | ||||
3/4" Wall Thick. | |||||||||||
| 2 1/2" | 1" | 70,000 | Seamless | No | Rockwell B85 (Medium) | ASTM A519 | 0000000 | ||||
| 3" | 1 1/2" | 70,000 | Seamless | No | Rockwell B85 (Medium) | ASTM A519 | 0000000 | ||||
| 3 1/4" | 1 3/4" | 35,000 | Seamless | Yes | Rockwell B60 (Medium) | ASTM A519 | 00000000 | ||||
| 3 1/2" | 2" | 70,000 | Seamless | No | Rockwell B85 (Medium) | ASTM A519 | 0000000 | ||||
| 3 3/4" | 2 1/4" | 35,000 | Seamless | Yes | Rockwell B60 (Medium) | ASTM A519 | 00000000 | ||||
| 4" | 2 1/2" | 70,000 | Seamless | No | Rockwell B85 (Medium) | ASTM A519 | 0000000 | ||||
| 4 1/2" | 3" | 70,000 | Seamless | No | Rockwell B85 (Medium) | ASTM A519 | 0000000 | ||||
| 5" | 3 1/2" | 70,000 | Seamless | No | Rockwell B85 (Medium) | ASTM A519 | 0000000 | ||||
| 6" | 4 1/2" | 35,000 | Seamless | Yes | Rockwell B60 (Medium) | ASTM A519 | 00000000 | ||||
1" Wall Thick. | |||||||||||
| 3" | 1" | 35,000 | Seamless | Yes | Rockwell B60 (Medium) | ASTM A519 | 00000000 | ||||
| 4" | 2" | 70,000 | Seamless | No | Rockwell B85 (Medium) | ASTM A519 | 0000000 | ||||
| 4 1/2" | 2 1/2" | 70,000 | Seamless | No | Rockwell B85 (Medium) | ASTM A519 | 0000000 | ||||
| 5" | 3" | 35,000 | Seamless | Yes | Rockwell B60 (Medium) | ASTM A519 | 00000000 | ||||
| 5 1/2" | 3 1/2" | 35,000 | Seamless | Yes | Rockwell B60 (Medium) | ASTM A519 | 00000000 | ||||
| 6" | 4" | 35,000 | Seamless | Yes | Rockwell B60 (Medium) | ASTM A519 | 00000000 | ||||
| 7" | 5" | 35,000 | Seamless | Yes | Rockwell B60 (Medium) | ASTM A519 | 00000000 | ||||
| 8" | 6" | 35,000 | Seamless | Yes | Rockwell B60 (Medium) | ASTM A519 | 00000000 | ||||
| 10" | 8" | 35,000 | Seamless | Yes | Rockwell B60 (Medium) | ASTM A519 | 00000000 | ||||
1 1/2" Wall Thick. | |||||||||||
| 6" | 3" | 35,000 | Seamless | Yes | Rockwell B60 (Medium) | ASTM A519 | 00000000 | ||||
| 8" | 5" | 35,000 | Seamless | Yes | Rockwell B60 (Medium) | ASTM A519 | 00000000 | ||||
2" Wall Thick. | |||||||||||
| 8" | 4" | 35,000 | Seamless | Yes | Rockwell B60 (Medium) | ASTM A519 | 00000000 | ||||
| 10" | 6" | 35,000 | Seamless | Yes | Rockwell B60 (Medium) | ASTM A519 | 00000000 | ||||
| 12" | 8" | 35,000 | Seamless | Yes | Rockwell B60 (Medium) | ASTM A519 | 00000000 | ||||
3" Wall Thick. | |||||||||||
| 10" | 4" | 35,000 | Seamless | Yes | Rockwell B60 (Medium) | ASTM A519 | 00000000 | ||||
| OD | ID | Yield Strength, psi | Fabrication | Heat Treatable | Heat Treatment | Hardness | Specifications Met | Each | |
1" Lg. | |||||||||
|---|---|---|---|---|---|---|---|---|---|
3/4" Wall Thick. | |||||||||
| 3 1/2" | 2" | 70,000 | Seamless | No | __ | Rockwell B85 (Medium) | ASTM A519 | 00000000 | 000000 |
| 3 3/4" | 2 1/4" | 65,000 | Seamless | No | Stress Relieved | Rockwell B80 (Medium) | ASTM A519 | 00000000 | 00000 |
| 4" | 2 1/2" | 70,000 | Seamless | No | __ | Rockwell B85 (Medium) | ASTM A519 | 00000000 | 00000 |
| 4 1/2" | 3" | 70,000 | Seamless | No | __ | Rockwell B85 (Medium) | ASTM A519 | 00000000 | 00000 |
| 5" | 3 1/2" | 70,000 | Seamless | No | __ | Rockwell B85 (Medium) | ASTM A519 | 00000000 | 00000 |
| 6" | 4 1/2" | 35,000 | Seamless | Yes | __ | Rockwell B60 (Medium) | ASTM A519 | 00000000 | 00000 |
1" Wall Thick. | |||||||||
| 3" | 1" | 35,000 | Seamless | Yes | __ | Rockwell B60 (Medium) | ASTM A519 | 00000000 | 00000 |
| 4" | 2" | 70,000 | Seamless | No | __ | Rockwell B85 (Medium) | ASTM A519 | 00000000 | 00000 |
| 4 1/2" | 2 1/2" | 70,000 | Seamless | No | __ | Rockwell B85 (Medium) | ASTM A519 | 00000000 | 00000 |
| 5" | 3" | 35,000 | Seamless | Yes | __ | Rockwell B60 (Medium) | ASTM A519 | 00000000 | 00000 |
| 5 1/2" | 3 1/2" | 35,000 | Seamless | Yes | __ | Rockwell B60 (Medium) | ASTM A519 | 00000000 | 00000 |
| 6" | 4" | 35,000 | Seamless | Yes | __ | Rockwell B60 (Medium) | ASTM A519 | 00000000 | 00000 |
| 7" | 5" | 35,000 | Seamless | Yes | __ | Rockwell B60 (Medium) | ASTM A519 | 00000000 | 00000 |
| 8" | 6" | 35,000 | Seamless | Yes | __ | Rockwell B60 (Medium) | ASTM A519 | 00000000 | 00000 |
| 10" | 8" | 35,000 | Seamless | Yes | __ | Rockwell B60 (Medium) | ASTM A519 | 00000000 | 00000 |
1 1/2" Wall Thick. | |||||||||
| 6" | 3" | 35,000 | Seamless | Yes | __ | Rockwell B60 (Medium) | ASTM A519 | 00000000 | 00000 |
| 8" | 5" | 35,000 | Seamless | Yes | __ | Rockwell B60 (Medium) | ASTM A519 | 00000000 | 00000 |
2" Wall Thick. | |||||||||
| 8" | 4" | 35,000 | Seamless | Yes | __ | Rockwell B60 (Medium) | ASTM A519 | 00000000 | 00000 |
| 10" | 6" | 35,000 | Seamless | Yes | __ | Rockwell B60 (Medium) | ASTM A519 | 00000000 | 00000 |
| 12" | 8" | 35,000 | Seamless | Yes | __ | Rockwell B60 (Medium) | ASTM A519 | 00000000 | 00000 |
3" Wall Thick. | |||||||||
| 10" | 4" | 35,000 | Seamless | Yes | __ | Rockwell B60 (Medium) | ASTM A519 | 00000000 | 000000 |
3" Lg. | |||||||||
3/4" Wall Thick. | |||||||||
| 3 1/2" | 2" | 70,000 | Seamless | No | __ | Rockwell B85 (Medium) | ASTM A519 | 00000000 | 00000 |
| 3 3/4" | 2 1/4" | 65,000 | Seamless | No | Stress Relieved | Rockwell B80 (Medium) | ASTM A519 | 00000000 | 00000 |
| 4" | 2 1/2" | 70,000 | Seamless | No | __ | Rockwell B85 (Medium) | ASTM A519 | 00000000 | 00000 |
| 4 1/2" | 3" | 70,000 | Seamless | No | __ | Rockwell B85 (Medium) | ASTM A519 | 00000000 | 00000 |
| 5" | 3 1/2" | 70,000 | Seamless | No | __ | Rockwell B85 (Medium) | ASTM A519 | 00000000 | 00000 |
| 6" | 4 1/2" | 35,000 | Seamless | Yes | __ | Rockwell B60 (Medium) | ASTM A519 | 00000000 | 00000 |
1" Wall Thick. | |||||||||
| 3" | 1" | 35,000 | Seamless | Yes | __ | Rockwell B60 (Medium) | ASTM A519 | 00000000 | 00000 |
| 4" | 2" | 70,000 | Seamless | No | __ | Rockwell B85 (Medium) | ASTM A519 | 00000000 | 00000 |
| 4 1/2" | 2 1/2" | 70,000 | Seamless | No | __ | Rockwell B85 (Medium) | ASTM A519 | 00000000 | 00000 |
| 5" | 3" | 35,000 | Seamless | Yes | __ | Rockwell B60 (Medium) | ASTM A519 | 00000000 | 00000 |
| 5 1/2" | 3 1/2" | 35,000 | Seamless | Yes | __ | Rockwell B60 (Medium) | ASTM A519 | 00000000 | 00000 |
| 6" | 4" | 35,000 | Seamless | Yes | __ | Rockwell B60 (Medium) | ASTM A519 | 00000000 | 00000 |
| 7" | 5" | 35,000 | Seamless | Yes | __ | Rockwell B60 (Medium) | ASTM A519 | 00000000 | 00000 |
| 8" | 6" | 35,000 | Seamless | Yes | __ | Rockwell B60 (Medium) | ASTM A519 | 00000000 | 00000 |
| 10" | 8" | 35,000 | Seamless | Yes | __ | Rockwell B60 (Medium) | ASTM A519 | 00000000 | 000000 |
1 1/2" Wall Thick. | |||||||||
| 6" | 3" | 35,000 | Seamless | Yes | __ | Rockwell B60 (Medium) | ASTM A519 | 00000000 | 000000 |
| 8" | 5" | 35,000 | Seamless | Yes | __ | Rockwell B60 (Medium) | ASTM A519 | 00000000 | 000000 |
2" Wall Thick. | |||||||||
| 8" | 4" | 35,000 | Seamless | Yes | __ | Rockwell B60 (Medium) | ASTM A519 | 00000000 | 000000 |
| 10" | 6" | 35,000 | Seamless | Yes | __ | Rockwell B60 (Medium) | ASTM A519 | 00000000 | 000000 |
| 12" | 8" | 35,000 | Seamless | Yes | __ | Rockwell B60 (Medium) | ASTM A519 | 00000000 | 000000 |
3" Wall Thick. | |||||||||
| 10" | 4" | 35,000 | Seamless | Yes | __ | Rockwell B60 (Medium) | ASTM A519 | 00000000 | 000000 |
Multipurpose 4140 Alloy Steel Round Tubes
- Yield Strength: 60,000 psi
- Hardness: Rockwell B85 (Medium)
- Heat Treatable: Yes
- Max. Hardness After Heat Treatment: Rockwell C60
- Fabrication: Seamless
- Specifications Met: ASTM A519
Made from alloy steel, also known as chrome-moly steel, these tubes resist fracturing from repeated stress. They’re used for a wide range of parts, including cylinders, rollers, and frames. For added wear resistance, they can be surface hardened with heat treating. These tubes have been manufactured to meet ASTM standards for quality and performance.
Note: Tubes may be made from either 4140 or 4142 alloy steel. They are interchangeable in most applications.
Certificates with a traceable lot number are available for these products. Download certificates from ORDER HISTORY after your order ships.
| OD | ID | Heat Treatment | Straightness Tolerance | 1/2 ft. Lg. | 1 ft. Lg. | 3 ft. Lg. | 4 ft. Lg. | 6 ft. Lg. | 8 ft. Lg. | |
1/2" Wall Thick. | ||||||||||
|---|---|---|---|---|---|---|---|---|---|---|
| 2 1/2" | 1 1/2" | Annealed (Softened) | 0.030" per ft. | 0000000 | ||||||
| 2 3/4" | 1 3/4" | Annealed (Softened) | 0.030" per ft. | 0000000 | ||||||
| 3" | 2" | Annealed (Softened) | 0.030" per ft. | 0000000 | ||||||
| 3 1/4" | 2 1/4" | Annealed (Softened) | 0.030" per ft. | 0000000 | ||||||
| 3 3/4" | 2 3/4" | Annealed (Softened) | 0.030" per ft. | 0000000 | ||||||
| 4" | 3" | Annealed (Softened) | 0.030" per ft. | 0000000 | ||||||
| 5" | 4" | Annealed (Softened) | 0.030" per ft. | 0000000 | ||||||
5/8" Wall Thick. | ||||||||||
| 3 1/4" | 2" | Annealed (Softened) | 0.030" per ft. | 0000000 | ||||||
| 4" | 2 3/4" | Annealed (Softened) | 0.030" per ft. | 0000000 | ||||||
3/4" Wall Thick. | ||||||||||
| 3" | 1 1/2" | Annealed (Softened) | 0.030" per ft. | 0000000 | ||||||
| 3 1/4" | 1 3/4" | Annealed (Softened) | 0.030" per ft. | 0000000 | ||||||
| 3 1/2" | 2" | Annealed (Softened) | 0.030" per ft. | 00000000 | ||||||
| 3 3/4" | 2 1/4" | Annealed (Softened) | 0.030" per ft. | 0000000 | ||||||
| 4" | 2 1/2" | Annealed (Softened) | 0.030" per ft. | 00000000 | ||||||
| 4 1/4" | 2 3/4" | Annealed (Softened) | 0.030" per ft. | 0000000 | ||||||
| 4 1/2" | 3" | Annealed (Softened) | 0.030" per ft. | 00000000 | ||||||
| 4 3/4" | 3 1/4" | Annealed (Softened) | 0.030" per ft. | 0000000 | ||||||
| 5" | 3 1/2" | Annealed (Softened) | 0.030" per ft. | 00000000 | ||||||
| 6" | 4 1/2" | Annealed (Softened) | 0.030" per ft. | 00000000 | ||||||
1" Wall Thick. | ||||||||||
| 3 1/2" | 1 1/2" | Annealed (Softened) | 0.030" per ft. | 0000000 | ||||||
| 4" | 2" | Annealed (Softened) | 0.030" per ft. | 00000000 | ||||||
| 4 1/2" | 2 1/2" | Annealed (Softened) | 0.030" per ft. | 00000000 | ||||||
| 5" | 3" | Annealed (Softened) | 0.030" per ft. | 00000000 | ||||||
| 5 1/2" | 3 1/2" | Annealed (Softened) | 0.030" per ft. | 00000000 | ||||||
| 6" | 4" | Annealed (Softened) | 0.030" per ft. | 00000000 | ||||||
| 6 1/2" | 4 1/2" | Annealed (Softened) | 0.030" per ft. | 00000000 | ||||||
| 7" | 5" | Annealed (Softened) | 0.030" per ft. | 00000000 | ||||||
| 8" | 6" | Annealed (Softened) | 0.030" per ft. | 00000000 | ||||||
1 1/4" Wall Thick. | ||||||||||
| 4 1/2" | 2" | Annealed (Softened) | 0.030" per ft. | 0000000 | ||||||
| 5" | 2 1/2" | Annealed (Softened) | 0.030" per ft. | 0000000 | ||||||
| 5 1/2" | 3" | Annealed (Softened) | 0.030" per ft. | 0000000 | ||||||
2" Wall Thick. | ||||||||||
| 6" | 2" | Annealed (Softened) | 0.030" per ft. | 0000000 | ||||||
| 8" | 4" | Annealed (Softened) | 0.030" per ft. | 00000000 | ||||||
| 10" | 6" | Annealed (Softened) | 0.030" per ft. | 00000000 | ||||||
| 12" | 8" | Annealed (Softened) | 0.030" per ft. | 00000000 | ||||||
3" Lg. | |||||
|---|---|---|---|---|---|
| OD | ID | Heat Treatment | Straightness Tolerance | Each | |
1/2" Wall Thick. | |||||
| 2 1/2" | 1 1/2" | Annealed (Softened) | 0.030" per ft. | 00000000 | 000000 |
| 2 3/4" | 1 3/4" | Annealed (Softened) | 0.030" per ft. | 00000000 | 00000 |
| 3" | 2" | Annealed (Softened) | 0.030" per ft. | 00000000 | 00000 |
| 3 3/4" | 2 3/4" | Annealed (Softened) | 0.030" per ft. | 00000000 | 00000 |
3/4" Wall Thick. | |||||
| 3" | 1 1/2" | Annealed (Softened) | 0.030" per ft. | 00000000 | 00000 |
| 4 3/4" | 3 1/4" | Annealed (Softened) | 0.030" per ft. | 00000000 | 00000 |
1" Wall Thick. | |||||
| 3 1/2" | 1 1/2" | Annealed (Softened) | 0.030" per ft. | 00000000 | 00000 |