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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.
Easy-to-Weld 4130 Alloy Steel Round Tubes
- Yield Strength: 70,000 psi
- Hardness: Rockwell C19 (Medium)
- Heat Treatable: Yes
- Max. Hardness After Heat Treatment: See table
- Fabrication: Seamless
- Specifications Met: MIL-T-6736, SAE AMS6360, SAE AMS-T-6736
Also known as chrome-moly steel, these 4130 alloy steel round tubes have low carbon content for good weldability. They’re often used for roll cages and frames. To increase their wear resistance, you can harden them with heat treating. These tubes have been manufactured to SAE and military standards for quality and performance.
Certificates with a traceable lot number are available for these products. Download certificates from ORDER HISTORY after your order ships.
| OD | ID | Maximum Hardness After Heat Treatment | Straightness Tolerance | 1/2 ft. Lg. | 1 ft. Lg. | 3 ft. Lg. | 4 ft. Lg. | 6 ft. Lg. | 8 ft. Lg. | 12 ft. Lg. | |
0.028" Wall Thick. | |||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|
| 1/4" | 0.194" | Rockwell C49 | 0.030" per 3 ft. | 000000000 | |||||||
| 3/8" | 0.319" | Rockwell C49 | 0.030" per 3 ft. | 000000000 | |||||||
| 1/2" | 0.444" | Rockwell C49 | 0.030" per 3 ft. | 000000000 | |||||||
| 5/8" | 0.569" | Rockwell C49 | 0.030" per 3 ft. | 000000000 | |||||||
| 3/4" | 0.694" | Rockwell C49 | 0.030" per 3 ft. | 000000000 | |||||||
| 1" | 0.944" | Rockwell C49 | 0.030" per 3 ft. | 000000000 | |||||||
0.035" Wall Thick. | |||||||||||
| 3/16" | 0.118" | Rockwell C49 | 0.030" per 3 ft. | 000000000 | |||||||
| 1/4" | 0.18" | Rockwell C49 | 0.030" per 3 ft. | 000000000 | |||||||
| 5/16" | 0.243" | Rockwell C49 | 0.030" per 3 ft. | 000000000 | |||||||
| 3/8" | 0.305" | Rockwell C49 | 0.030" per 3 ft. | 000000000 | |||||||
| 1/2" | 0.43" | Rockwell C49 | 0.030" per 3 ft. | 000000000 | |||||||
| 5/8" | 0.555" | Rockwell C49 | 0.030" per 3 ft. | 000000000 | |||||||
| 3/4" | 0.68" | Rockwell C49 | 0.030" per 3 ft. | 000000000 | |||||||
| 7/8" | 0.805" | Rockwell C49 | 0.030" per 3 ft. | 000000000 | |||||||
| 1" | 0.93" | Rockwell C49 | 0.030" per 3 ft. | 000000000 | |||||||
| 1 1/8" | 1.055" | Rockwell C49 | 0.030" per 3 ft. | 000000000 | |||||||
| 1 1/4" | 1.18" | Rockwell C49 | 0.030" per 3 ft. | 000000000 | |||||||
| 1 3/8" | 1.305" | Rockwell C49 | 0.030" per 3 ft. | 000000000 | |||||||
| 1 1/2" | 1.43" | Rockwell C49 | 0.030" per 3 ft. | 000000000 | |||||||
0.049" Wall Thick. | |||||||||||
| 1/4" | 0.152" | Rockwell C49 | 0.030" per 3 ft. | 000000000 | |||||||
| 5/16" | 0.215" | Rockwell C49 | 0.030" per 3 ft. | 000000000 | |||||||
| 3/8" | 0.277" | Rockwell C49 | 0.030" per 3 ft. | 000000000 | |||||||
| 7/16" | 0.34" | Rockwell C49 | 0.030" per 3 ft. | 000000000 | |||||||
| 1/2" | 0.402" | Rockwell C49 | 0.030" per 3 ft. | 000000000 | |||||||
| 5/8" | 0.527" | Rockwell C49 | 0.030" per 3 ft. | 000000000 | |||||||
| 3/4" | 0.652" | Rockwell C49 | 0.030" per 3 ft. | 000000000 | |||||||
| 7/8" | 0.777" | Rockwell C49 | 0.030" per 3 ft. | 000000000 | |||||||
| 1" | 0.902" | __ | 0.030" per 3 ft. | 000000000 | |||||||
| 1 1/8" | 1.027" | Rockwell C49 | 0.030" per 3 ft. | 000000000 | |||||||
| 1 1/4" | 1.152" | Rockwell C49 | 0.030" per 3 ft. | 000000000 | |||||||
| 1 3/8" | 1.277" | Rockwell C49 | 0.030" per 3 ft. | 000000000 | |||||||
| 1 1/2" | 1.402" | Rockwell C49 | 0.030" per 3 ft. | 000000000 | |||||||
| 1 3/4" | 1.652" | Rockwell C49 | 0.030" per 3 ft. | 000000000 | |||||||
| 2" | 1.902" | Rockwell C49 | 0.030" per 3 ft. | 000000000 | |||||||
0.058" Wall Thick. | |||||||||||
| 3/8" | 0.259" | Rockwell C49 | 0.030" per 3 ft. | 000000000 | |||||||
| 7/16" | 0.322" | Rockwell C49 | 0.030" per 3 ft. | 000000000 | |||||||
| 1/2" | 0.384" | __ | 0.030" per 3 ft. | 000000000 | |||||||
| 5/8" | 0.509" | Rockwell C49 | 0.030" per 3 ft. | 000000000 | |||||||
| 3/4" | 0.634" | Rockwell C49 | 0.030" per 3 ft. | 000000000 | |||||||
| 7/8" | 0.759" | Rockwell C49 | 0.030" per 3 ft. | 000000000 | |||||||
| 1" | 0.884" | __ | 0.030" per 3 ft. | 000000000 | |||||||
| 1 1/8" | 1.009" | Rockwell C49 | 0.030" per 3 ft. | 000000000 | |||||||
| 1 1/4" | 1.134" | Rockwell C49 | 0.030" per 3 ft. | 000000000 | |||||||
| 1 3/8" | 1.259" | Rockwell C49 | 0.030" per 3 ft. | 000000000 | |||||||
| 1 1/2" | 1.384" | Rockwell C49 | 0.030" per 3 ft. | 000000000 | |||||||
| 1 3/4" | 1.634" | Rockwell C49 | 0.030" per 3 ft. | 000000000 | |||||||
0.065" Wall Thick. | |||||||||||
| 1/4" | 0.12" | Rockwell C49 | 0.030" per 3 ft. | 000000000 | |||||||
| 5/16" | 0.183" | Rockwell C49 | 0.030" per 3 ft. | 000000000 | |||||||
| 3/8" | 0.245" | Rockwell C49 | 0.030" per 3 ft. | 000000000 | |||||||
| 7/16" | 0.308" | Rockwell C49 | 0.030" per 3 ft. | 000000000 | |||||||
| 1/2" | 0.37" | Rockwell C49 | 0.030" per 3 ft. | 000000000 | |||||||
| 9/16" | 0.433" | Rockwell C49 | 0.030" per 3 ft. | 000000000 | |||||||
| 5/8" | 0.495" | Rockwell C49 | 0.030" per 3 ft. | 000000000 | |||||||
| 3/4" | 0.62" | Rockwell C49 | 0.030" per 3 ft. | 000000000 | |||||||
| 7/8" | 0.745" | Rockwell C49 | 0.030" per 3 ft. | 000000000 | |||||||
| 1" | 0.87" | Rockwell C49 | 0.030" per 3 ft. | 000000000 | |||||||
| 1 1/8" | 0.995" | Rockwell C49 | 0.030" per 3 ft. | 000000000 | |||||||
| 1 1/4" | 1.12" | __ | 0.030" per 3 ft. | 000000000 | |||||||
| 1 3/8" | 1.245" | Rockwell C49 | 0.030" per 3 ft. | 000000000 | |||||||
| 1 1/2" | 1.37" | Rockwell C49 | 0.030" per 3 ft. | 000000000 | |||||||
| 1 5/8" | 1.495" | Rockwell C49 | 0.030" per 3 ft. | 000000000 | |||||||
| 1 3/4" | 1.62" | Rockwell C49 | 0.030" per 3 ft. | 000000000 | |||||||
| 2" | 1.87" | Rockwell C49 | 0.030" per 3 ft. | 000000000 | |||||||
0.083" Wall Thick. | |||||||||||
| 3/8" | 0.209" | Rockwell C49 | 0.030" per 3 ft. | 000000000 | |||||||
| 7/16" | 0.272" | Rockwell C49 | 0.030" per 3 ft. | 000000000 | |||||||
| 1/2" | 0.334" | Rockwell C49 | 0.030" per 3 ft. | 000000000 | |||||||
| 9/16" | 0.397" | Rockwell C49 | 0.030" per 3 ft. | 000000000 | |||||||
| 5/8" | 0.459" | Rockwell C49 | 0.030" per 3 ft. | 000000000 | |||||||
| 3/4" | 0.584" | Rockwell C49 | 0.030" per 3 ft. | 000000000 | |||||||
| 7/8" | 0.709" | Rockwell C49 | 0.030" per 3 ft. | 000000000 | |||||||
| 1" | 0.834" | __ | 0.030" per 3 ft. | 000000000 | |||||||
| 1 1/8" | 0.959" | Rockwell C49 | 0.030" per 3 ft. | 000000000 | |||||||
| 1 1/4" | 1.084" | __ | 0.030" per 3 ft. | 000000000 | |||||||
| 1 3/8" | 1.209" | Rockwell C49 | 0.030" per 3 ft. | 000000000 | |||||||
| 1 1/2" | 1.334" | Rockwell C49 | 0.030" per 3 ft. | 000000000 | |||||||
| 1 5/8" | 1.459" | Rockwell C49 | 0.030" per 3 ft. | 000000000 | |||||||
| 1 3/4" | 1.584" | Rockwell C49 | 0.030" per 3 ft. | 000000000 | |||||||
| 2" | 1.834" | Rockwell C49 | 0.030" per 3 ft. | 000000000 | |||||||
0.095" Wall Thick. | |||||||||||
| 5/16" | 0.123" | Rockwell C49 | 0.030" per 3 ft. | 000000000 | |||||||
| 7/16" | 0.248" | Rockwell C49 | 0.030" per 3 ft. | 000000000 | |||||||
| 1/2" | 0.31" | Rockwell C49 | 0.030" per 3 ft. | 000000000 | |||||||
| 3/4" | 0.56" | Rockwell C49 | 0.030" per 3 ft. | 000000000 | |||||||
| 1" | 0.81" | __ | 0.030" per 3 ft. | 000000000 | |||||||
| 1 1/8" | 0.935" | Rockwell C49 | 0.030" per 3 ft. | 000000000 | |||||||
| 1 1/4" | 1.06" | __ | 0.030" per 3 ft. | 000000000 | |||||||
| 1 3/8" | 1.185" | Rockwell C49 | 0.030" per 3 ft. | 000000000 | |||||||
| 1 1/2" | 1.31" | Rockwell C49 | 0.030" per 3 ft. | 000000000 | |||||||
| 1 5/8" | 1.435" | Rockwell C49 | 0.030" per 3 ft. | 000000000 | |||||||
| 1 3/4" | 1.56" | Rockwell C49 | 0.030" per 3 ft. | 000000000 | |||||||
| 2" | 1.81" | Rockwell C49 | 0.030" per 3 ft. | 000000000 | |||||||
| 2 1/2" | 2.31" | Rockwell C49 | 0.030" per 3 ft. | 000000000 | |||||||
0.12" Wall Thick. | |||||||||||
| 3/8" | 0.135" | Rockwell C49 | 0.030" per 3 ft. | 000000000 | |||||||
| 7/16" | 0.198" | Rockwell C49 | 0.030" per 3 ft. | 000000000 | |||||||
| 1/2" | 0.26" | Rockwell C49 | 0.030" per 3 ft. | 000000000 | |||||||
| 9/16" | 0.323" | Rockwell C49 | 0.030" per 3 ft. | 000000000 | |||||||
| 5/8" | 0.385" | Rockwell C49 | 0.030" per 3 ft. | 000000000 | |||||||
| 3/4" | 0.51" | __ | 0.030" per 3 ft. | 000000000 | |||||||
| 7/8" | 0.635" | Rockwell C49 | 0.030" per 3 ft. | 000000000 | |||||||
| 1" | 0.76" | __ | 0.030" per 3 ft. | 000000000 | |||||||
| 1 1/8" | 0.885" | Rockwell C49 | 0.030" per 3 ft. | 000000000 | |||||||
| 1 1/4" | 1.01" | __ | 0.030" per 3 ft. | 000000000 | |||||||
| 1 3/8" | 1.135" | Rockwell C49 | 0.030" per 3 ft. | 000000000 | |||||||
| 1 1/2" | 1.26" | __ | 0.030" per 3 ft. | 000000000 | |||||||
| 1 3/4" | 1.51" | __ | 0.030" per 3 ft. | 000000000 | |||||||
| 2" | 1.76" | Rockwell C49 | 0.030" per 3 ft. | 000000000 | |||||||
| 2 1/4" | 2.01" | __ | 0.030" per 3 ft. | 000000000 | |||||||
| 2 1/2" | 2.26" | Rockwell C49 | 0.030" per 3 ft. | 000000000 | |||||||
| 3" | 2.76" | Rockwell C49 | 0.030" per 3 ft. | 000000000 | |||||||
0.156" Wall Thick. | |||||||||||
| 5/8" | 0.313" | Rockwell C49 | 0.030" per 3 ft. | 000000000 | |||||||
0.188" Wall Thick. | |||||||||||
| 5/8" | 0.249" | Rockwell C49 | 0.030" per 3 ft. | 000000000 | |||||||
| 3/4" | 0.374" | Rockwell C49 | 0.030" per 3 ft. | 000000000 | |||||||
| 1" | 0.624" | __ | 0.030" per 3 ft. | 000000000 | |||||||
| 1 1/8" | 0.749" | Rockwell C49 | 0.030" per 3 ft. | 000000000 | |||||||
| 1 1/4" | 0.874" | Rockwell C49 | 0.030" per 3 ft. | 000000000 | |||||||
| 1 1/2" | 1.124" | __ | 0.030" per 3 ft. | 000000000 | |||||||
| 1 3/4" | 1.374" | Not Rated | 0.030" per 3 ft. | 000000000 | |||||||
| 2" | 1.624" | Rockwell C49 | 0.030" per 3 ft. | 000000000 | |||||||
| 2 1/2" | 2.124" | Rockwell C49 | 0.030" per 3 ft. | 000000000 | |||||||
1/4" Wall Thick. | |||||||||||
| 1" | 1/2" | Rockwell C49 | 0.030" per 3 ft. | 000000000 | |||||||
| 1 1/8" | 5/8" | Not Rated | 0.030" per 3 ft. | 000000000 | |||||||
| 1 1/4" | 3/4" | Not Rated | 0.030" per 3 ft. | 000000000 | |||||||
| 1 1/2" | 1" | Not Rated | 0.030" per 3 ft. | 000000000 | |||||||
| 1 3/4" | 1 1/4" | Not Rated | 0.030" per 3 ft. | 000000000 | |||||||
| 2" | 1 1/2" | Rockwell C49 | 0.030" per 3 ft. | 0000000 | |||||||
| 2 1/2" | 2" | Not Rated | 0.030" per 3 ft. | 000000000 | |||||||
| 3" | 2 1/2" | Rockwell C49 | 0.030" per 3 ft. | 000000000 | |||||||
3" Lg. | |||||
|---|---|---|---|---|---|
| OD | ID | Maximum Hardness After Heat Treatment | Straightness Tolerance | Each | |
0.12" Wall Thick. | |||||
| 1 3/4" | 1.51" | Not Rated | 0.030" per 3 ft. | 000000000 | 000000 |
| 2 1/4" | 2.01" | Not Rated | 0.030" per 3 ft. | 000000000 | 00000 |
0.188" Wall Thick. | |||||
| 1" | 0.624" | Not Rated | 0.030" per 3 ft. | 000000000 | 00000 |
1/4" Wall Thick. | |||||
| 1" | 1/2" | Rockwell C49 | 0.030" per 3 ft. | 000000000 | 00000 |
| 1 1/2" | 1" | Not Rated | 0.030" per 3 ft. | 000000000 | 00000 |
| 2" | 1 1/2" | Not Rated | 0.030" per 3 ft. | 000000000 | 00000 |
| 3" | 2 1/2" | Rockwell C49 | 0.030" per 3 ft. | 000000000 | 00000 |
Easy-to-Weld 4130 Alloy Steel Rectangular Tubes
- Yield Strength: 75,000 psi
- Hardness: Rockwell C20 (Hard)
- Heat Treatable: Yes
- Max. Hardness After Heat Treatment: Rockwell C49
- Fabrication: Seamless
- Specifications Met: MIL-T-6736, SAE AMS-T-6736
Made from 4130 alloy steel, also known as chrome-moly steel, these tubes have low carbon content for good weldability. They’re often used for building frames and supports, since their flat sides make them easier to bolt than round tubes. To increase their wear resistance, you can harden them with heat treating. These tubes have been manufactured to SAE and military standards for quality and performance.
Certificates with a traceable lot number are available for these products. Download certificates from ORDER HISTORY after your order ships.
Outside | Inside | ||||||||
|---|---|---|---|---|---|---|---|---|---|
| Ht. | Wd. | Ht. | Wd. | 1/2 ft. Lg. | 1 ft. Lg. | 2 ft. Lg. | 3 ft. Lg. | 6 ft. Lg. | |
0.035" Wall Thick. | |||||||||
| 3/8" | 3/8" | 0.305" | 0.305" | 0000000 | |||||
| 1/2" | 1/2" | 0.43" | 0.43" | 0000000 | |||||
| 1/2" | 1" | 0.43" | 0.93" | 0000000 | |||||
| 5/8" | 5/8" | 0.555" | 0.555" | 0000000 | |||||
| 3/4" | 3/4" | 0.68" | 0.68" | 0000000 | |||||
| 1" | 1" | 0.93" | 0.93" | 0000000 | |||||
0.049" Wall Thick. | |||||||||
| 1/2" | 1" | 0.402" | 0.902" | 0000000 | |||||
| 5/8" | 5/8" | 0.527" | 0.527" | 0000000 | |||||
| 3/4" | 3/4" | 0.652" | 0.652" | 0000000 | |||||
| 3/4" | 1 1/2" | 0.652" | 1.402" | 0000000 | |||||
| 1" | 1" | 0.902" | 0.902" | 0000000 | |||||
| 1" | 1 1/2" | 0.902" | 1.402" | 0000000 | |||||
0.065" Wall Thick. | |||||||||
| 1/2" | 1" | 0.37" | 0.87" | 0000000 | |||||
| 5/8" | 5/8" | 0.495" | 0.495" | 0000000 | |||||
| 3/4" | 3/4" | 0.62" | 0.62" | 0000000 | |||||
| 1" | 1" | 0.87" | 0.87" | 0000000 | |||||
| 1" | 1 1/2" | 0.87" | 1.37" | 0000000 | |||||
| 1" | 1 3/4" | 0.87" | 1.62" | 0000000 | |||||
| 1" | 2" | 0.87" | 1.87" | 0000000 | |||||