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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.
Weldable 4130 Alloy Steel Round Tubes
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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.
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Certificates with a traceable lot number are available for these products. Download certificates from ORDER HISTORY after your order ships.
OD | ID | Fabrication | Heat Treatable | Yield Strength, psi | Hardness | Max. Hardness After Heat Treatment | Specs. Met | 3" Long | 1/2 ft. Long | 1 ft. Long | 3 ft. Long | 4 ft. Long | 6 ft. Long | 8 ft. Long | 12 ft. Long | |||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
0.028" Thick Wall | ||||||||||||||||||
| 1/4" | 0.194" | Seamless | Yes | 70,000 | Rockwell C16 (Medium) | Rockwell C49 | SAE AMS6360, SAE AMS-T-6736 | 89955K439 | — | — | 00000 | 000000 | — | 000000 | 000000 | — | ||
| 3/8" | 0.319" | Seamless | Yes | 70,000 | Rockwell C16 (Medium) | Rockwell C49 | SAE AMS6360, SAE AMS-T-6736 | 89955K469 | — | — | 0000 | 00000 | — | 00000 | — | — | ||
| 1/2" | 0.444" | Seamless | Yes | 70,000 | Rockwell C16 (Medium) | Rockwell C49 | SAE AMS6360, SAE AMS-T-6736 | 89955K479 | — | — | 0000 | 00000 | — | 00000 | — | — | ||
| 5/8" | 0.569" | Seamless | Yes | 70,000 | Rockwell C16 (Medium) | Rockwell C49 | SAE AMS6360, SAE AMS-T-6736 | 89955K489 | — | — | 0000 | 00000 | — | 00000 | — | — | ||
| 3/4" | 0.694" | Seamless | Yes | 70,000 | Rockwell C16 (Medium) | Rockwell C49 | SAE AMS6360, SAE AMS-T-6736 | 89955K438 | — | — | 0000 | 00000 | — | 00000 | — | — | ||
| 1" | 0.944" | Seamless | Yes | 70,000 | Rockwell C16 (Medium) | Rockwell C49 | SAE AMS6360, SAE AMS-T-6736 | 89955K499 | — | — | 00000 | 00000 | — | 00000 | — | — | ||
0.035" Thick Wall | ||||||||||||||||||
| 3/16" | 0.118" | Seamless | Yes | 70,000 | Rockwell C16 (Medium) | Rockwell C49 | SAE AMS6360, SAE AMS-T-6736 | 89955K119 | — | — | 0000 | 00000 | — | 00000 | — | — | ||
| 1/4" | 0.18" | Seamless | Yes | 70,000 | Rockwell C16 (Medium) | Rockwell C49 | SAE AMS6360, SAE AMS-T-6736 | 89955K219 | — | — | 0000 | 00000 | 000000 | 00000 | 00000 | — | ||
| 5/16" | 0.243" | Seamless | Yes | 70,000 | Rockwell C16 (Medium) | Rockwell C49 | SAE AMS6360, SAE AMS-T-6736 | 89955K239 | — | — | 0000 | 00000 | 00000 | 00000 | 00000 | — | ||
| 3/8" | 0.305" | Seamless | Yes | 70,000 | Rockwell C16 (Medium) | Rockwell C49 | SAE AMS6360, SAE AMS-T-6736 | 89955K149 | — | — | 0000 | 00000 | — | 00000 | 00000 | — | ||
| 1/2" | 0.43" | Seamless | Yes | 70,000 | Rockwell C16 (Medium) | Rockwell C49 | SAE AMS6360, SAE AMS-T-6736 | 89955K259 | — | — | 0000 | 00000 | 00000 | 00000 | 00000 | — | ||
| 5/8" | 0.555" | Seamless | Yes | 70,000 | Rockwell C16 (Medium) | Rockwell C49 | SAE AMS6360, SAE AMS-T-6736 | 89955K279 | — | — | 0000 | 00000 | 00000 | 00000 | 00000 | — | ||
| 3/4" | 0.68" | Seamless | Yes | 70,000 | Rockwell C16 (Medium) | Rockwell C49 | SAE AMS6360, SAE AMS-T-6736 | 89955K299 | — | — | 0000 | 00000 | 00000 | 00000 | 00000 | — | ||
| 7/8" | 0.805" | Seamless | Yes | 70,000 | Rockwell C16 (Medium) | Rockwell C49 | SAE AMS6360, SAE AMS-T-6736 | 89955K849 | — | — | 00000 | 00000 | — | 00000 | — | — | ||
| 1" | 0.93" | Seamless | Yes | 70,000 | Rockwell C16 (Medium) | Rockwell C49 | SAE AMS6360, SAE AMS-T-6736 | 89955K339 | — | — | 00000 | 00000 | — | 00000 | — | — | ||
| 1 1/8" | 1.055" | Seamless | Yes | 70,000 | Rockwell C16 (Medium) | Rockwell C49 | SAE AMS6360, SAE AMS-T-6736 | 89955K919 | — | — | 00000 | 00000 | — | 00000 | — | — | ||
| 1 1/4" | 1.18" | Seamless | Yes | 70,000 | Rockwell C16 (Medium) | Rockwell C49 | SAE AMS6360, SAE AMS-T-6736 | 89955K369 | — | — | 00000 | 00000 | — | 00000 | — | — | ||
| 1 3/8" | 1.305" | Seamless | Yes | 70,000 | Rockwell C16 (Medium) | Rockwell C49 | SAE AMS6360, SAE AMS-T-6736 | 89955K979 | — | — | 00000 | 00000 | — | 00000 | — | — | ||
| 1 1/2" | 1.43" | Seamless | Yes | 70,000 | Rockwell C16 (Medium) | Rockwell C49 | SAE AMS6360, SAE AMS-T-6736 | 89955K389 | — | — | 00000 | 00000 | — | 00000 | — | — | ||
0.049" Thick Wall | ||||||||||||||||||
| 1/4" | 0.152" | Seamless | Yes | 70,000 | Rockwell C16 (Medium) | Rockwell C49 | SAE AMS6360, SAE AMS-T-6736 | 89955K229 | — | — | 0000 | 00000 | — | 00000 | 00000 | — | ||
| 5/16" | 0.215" | Seamless | Yes | 70,000 | Rockwell C16 (Medium) | Rockwell C49 | SAE AMS6360, SAE AMS-T-6736 | 89955K249 | — | — | 0000 | 00000 | — | 00000 | — | — | ||
| 3/8" | 0.277" | Seamless | Yes | 70,000 | Rockwell C16 (Medium) | Rockwell C49 | SAE AMS6360, SAE AMS-T-6736 | 89955K159 | — | — | 0000 | 00000 | 00000 | 00000 | 00000 | — | ||
| 7/16" | 0.34" | Seamless | Yes | 70,000 | Rockwell C16 (Medium) | Rockwell C49 | SAE AMS6360, SAE AMS-T-6736 | 89955K739 | — | — | 0000 | 00000 | — | 00000 | — | — | ||
| 1/2" | 0.402" | Seamless | Yes | 70,000 | Rockwell C16 (Medium) | Rockwell C49 | SAE AMS6360, SAE AMS-T-6736 | 89955K269 | — | — | 0000 | 00000 | — | 00000 | 00000 | — | ||
| 5/8" | 0.527" | Seamless | Yes | 70,000 | Rockwell C16 (Medium) | Rockwell C49 | SAE AMS6360, SAE AMS-T-6736 | 89955K289 | — | — | 0000 | 00000 | — | 00000 | 00000 | — | ||
| 3/4" | 0.652" | Seamless | Yes | 70,000 | Rockwell C16 (Medium) | Rockwell C49 | SAE AMS6360, SAE AMS-T-6736 | 89955K329 | — | — | 0000 | 00000 | — | 00000 | 00000 | — | ||
| 7/8" | 0.777" | Seamless | Yes | 70,000 | Rockwell C16 (Medium) | Rockwell C49 | SAE AMS6360, SAE AMS-T-6736 | 89955K859 | — | — | 00000 | 00000 | — | 00000 | 00000 | — | ||
| 1" | 0.902" | Seamless | Yes | 70,000 | Rockwell C19 (Medium) | Not Rated | SAE AMS6360, SAE AMS-T-6736 | 89955K359 | — | — | 00000 | 00000 | — | 00000 | 00000 | — | ||
| 1 1/8" | 1.027" | Seamless | Yes | 70,000 | Rockwell C16 (Medium) | Rockwell C49 | SAE AMS6360, SAE AMS-T-6736 | 89955K929 | — | — | 00000 | 00000 | — | 00000 | — | — | ||
| 1 1/4" | 1.152" | Seamless | Yes | 70,000 | Rockwell C16 (Medium) | Rockwell C49 | SAE AMS6360, SAE AMS-T-6736 | 89955K379 | — | — | 00000 | 00000 | — | 00000 | — | — | ||
| 1 3/8" | 1.277" | Seamless | Yes | 70,000 | Rockwell C16 (Medium) | Rockwell C49 | SAE AMS6360, SAE AMS-T-6736 | 89955K989 | — | — | 00000 | 00000 | — | 00000 | — | — | ||
| 1 1/2" | 1.402" | Seamless | Yes | 70,000 | Rockwell C16 (Medium) | Rockwell C49 | SAE AMS6360, SAE AMS-T-6736 | 89955K399 | — | — | 00000 | 00000 | — | 00000 | — | — | ||
| 1 3/4" | 1.652" | Seamless | Yes | 70,000 | Rockwell C16 (Medium) | Rockwell C49 | SAE AMS6360, SAE AMS-T-6736 | 89955K189 | — | — | 00000 | 00000 | — | 000000 | — | — | ||
| 2" | 1.902" | Seamless | Yes | 70,000 | Rockwell C16 (Medium) | Rockwell C49 | SAE AMS6360, SAE AMS-T-6736 | 89955K429 | — | — | 00000 | 00000 | — | 000000 | — | — | ||
0.058" Thick Wall | ||||||||||||||||||
| 3/8" | 0.259" | Seamless | Yes | 70,000 | Rockwell C16 (Medium) | Rockwell C49 | SAE AMS6360, SAE AMS-T-6736 | 89955K118 | — | — | 0000 | 00000 | 00000 | 00000 | 00000 | — | ||
| 7/16" | 0.322" | Seamless | Yes | 70,000 | Rockwell C16 (Medium) | Rockwell C49 | SAE AMS6360, SAE AMS-T-6736 | 89955K128 | — | — | 00000 | 00000 | — | 00000 | — | — | ||
| 1/2" | 0.384" | Seamless | Yes | 70,000 | Rockwell C19 (Medium) | Not Rated | SAE AMS6360, SAE AMS-T-6736 | 89955K138 | — | — | 00000 | 00000 | 00000 | 00000 | 00000 | 000000 | ||
| 5/8" | 0.509" | Seamless | Yes | 70,000 | Rockwell C16 (Medium) | Rockwell C49 | SAE AMS6360, SAE AMS-T-6736 | 89955K148 | — | — | 00000 | 00000 | 00000 | 00000 | 00000 | — | ||
| 3/4" | 0.634" | Seamless | Yes | 70,000 | Rockwell C16 (Medium) | Rockwell C49 | SAE AMS6360, SAE AMS-T-6736 | 89955K158 | — | — | 00000 | 00000 | 00000 | 00000 | 00000 | — | ||
| 7/8" | 0.759" | Seamless | Yes | 70,000 | Rockwell C16 (Medium) | Rockwell C49 | SAE AMS6360, SAE AMS-T-6736 | 89955K168 | — | — | 00000 | 00000 | 00000 | 00000 | 00000 | — | ||
| 1" | 0.884" | Seamless | Yes | 70,000 | Rockwell C19 (Medium) | Not Rated | SAE AMS6360, SAE AMS-T-6736 | 89955K178 | — | — | 00000 | 00000 | — | 00000 | 00000 | — | ||
| 1 1/8" | 1.009" | Seamless | Yes | 70,000 | Rockwell C16 (Medium) | Rockwell C49 | SAE AMS6360, SAE AMS-T-6736 | 89955K188 | — | — | 00000 | 00000 | — | 00000 | — | — | ||
| 1 1/4" | 1.134" | Seamless | Yes | 70,000 | Rockwell C16 (Medium) | Rockwell C49 | SAE AMS6360, SAE AMS-T-6736 | 89955K198 | — | — | 00000 | 00000 | — | 00000 | — | — | ||
| 1 3/8" | 1.259" | Seamless | Yes | 70,000 | Rockwell C16 (Medium) | Rockwell C49 | SAE AMS6360, SAE AMS-T-6736 | 89955K218 | — | — | 00000 | 00000 | — | 00000 | — | — | ||
| 1 1/2" | 1.384" | Seamless | Yes | 70,000 | Rockwell C16 (Medium) | Rockwell C49 | SAE AMS6360, SAE AMS-T-6736 | 89955K228 | — | — | 00000 | 00000 | — | 00000 | — | — | ||
| 1 3/4" | 1.634" | Seamless | Yes | 70,000 | Rockwell C16 (Medium) | Rockwell C49 | SAE AMS6360, SAE AMS-T-6736 | 89955K238 | — | — | 00000 | 00000 | — | 00000 | — | — | ||
0.065" Thick Wall | ||||||||||||||||||
| 1/4" | 0.12" | Seamless | Yes | 70,000 | Rockwell C16 (Medium) | Rockwell C49 | SAE AMS6360, SAE AMS-T-6736 | 89955K519 | — | — | 0000 | 00000 | — | 00000 | 00000 | — | ||
| 5/16" | 0.183" | Seamless | Yes | 70,000 | Rockwell C16 (Medium) | Rockwell C49 | SAE AMS6360, SAE AMS-T-6736 | 89955K539 | — | — | 0000 | 00000 | — | 00000 | — | — | ||
| 3/8" | 0.245" | Seamless | Yes | 70,000 | Rockwell C16 (Medium) | Rockwell C49 | SAE AMS6360, SAE AMS-T-6736 | 89955K449 | — | — | 0000 | 00000 | 00000 | 00000 | 00000 | — | ||
| 7/16" | 0.308" | Seamless | Yes | 70,000 | Rockwell C16 (Medium) | Rockwell C49 | SAE AMS6360, SAE AMS-T-6736 | 89955K749 | — | — | 0000 | 00000 | — | 00000 | — | — | ||
| 1/2" | 0.37" | Seamless | Yes | 70,000 | Rockwell C16 (Medium) | Rockwell C49 | SAE AMS6360, SAE AMS-T-6736 | 89955K559 | — | — | 00000 | 00000 | 00000 | 00000 | 00000 | — | ||
| 9/16" | 0.433" | Seamless | Yes | 70,000 | Rockwell C16 (Medium) | Rockwell C49 | SAE AMS6360, SAE AMS-T-6736 | 89955K789 | — | — | 00000 | 00000 | — | 00000 | — | — | ||
| 5/8" | 0.495" | Seamless | Yes | 70,000 | Rockwell C16 (Medium) | Rockwell C49 | SAE AMS6360, SAE AMS-T-6736 | 89955K579 | — | — | 00000 | 00000 | 00000 | 00000 | 00000 | — | ||
| 3/4" | 0.62" | Seamless | Yes | 70,000 | Rockwell C16 (Medium) | Rockwell C49 | SAE AMS6360, SAE AMS-T-6736 | 89955K599 | — | — | 00000 | 00000 | 00000 | 00000 | 00000 | 00000 | ||
| 7/8" | 0.745" | Seamless | Yes | 70,000 | Rockwell C16 (Medium) | Rockwell C49 | SAE AMS6360, SAE AMS-T-6736 | 89955K869 | — | — | 00000 | 00000 | — | 00000 | 00000 | — | ||
| 1" | 0.87" | Seamless | Yes | 70,000 | Rockwell C16 (Medium) | Rockwell C49 | SAE AMS6360, SAE AMS-T-6736 | 89955K639 | — | — | 00000 | 00000 | 00000 | 00000 | 00000 | 00000 | ||
| 1 1/8" | 0.995" | Seamless | Yes | 70,000 | Rockwell C16 (Medium) | Rockwell C49 | SAE AMS6360, SAE AMS-T-6736 | 89955K939 | — | — | 00000 | 00000 | 00000 | 00000 | 00000 | — | ||
| 1 1/4" | 1.12" | Seamless | Yes | 70,000 | Rockwell C19 (Medium) | Not Rated | SAE AMS6360, SAE AMS-T-6736 | 89955K659 | — | — | 00000 | 00000 | — | 00000 | 00000 | — | ||
| 1 3/8" | 1.245" | Seamless | Yes | 70,000 | Rockwell C16 (Medium) | Rockwell C49 | SAE AMS6360, SAE AMS-T-6736 | 89955K129 | — | — | 00000 | 00000 | — | 00000 | — | — | ||
| 1 1/2" | 1.37" | Seamless | Yes | 70,000 | Rockwell C16 (Medium) | Rockwell C49 | SAE AMS6360, SAE AMS-T-6736 | 89955K679 | — | — | 00000 | 00000 | — | 00000 | — | — | ||
| 1 5/8" | 1.495" | Seamless | Yes | 70,000 | Rockwell C16 (Medium) | Rockwell C49 | SAE AMS6360, SAE AMS-T-6736 | 89955K248 | — | — | 00000 | 00000 | — | 00000 | — | — | ||
| 1 3/4" | 1.62" | Seamless | Yes | 70,000 | Rockwell C16 (Medium) | Rockwell C49 | SAE AMS6360, SAE AMS-T-6736 | 89955K199 | — | — | 00000 | 00000 | — | 00000 | — | — | ||
| 2" | 1.87" | Seamless | Yes | 70,000 | Rockwell C16 (Medium) | Rockwell C49 | SAE AMS6360, SAE AMS-T-6736 | 89955K699 | — | — | 00000 | 00000 | — | 000000 | — | — | ||
0.083" Thick Wall | ||||||||||||||||||
| 3/8" | 0.209" | Seamless | Yes | 70,000 | Rockwell C16 (Medium) | Rockwell C49 | SAE AMS6360, SAE AMS-T-6736 | 89955K459 | — | — | 00000 | 00000 | 00000 | 00000 | 00000 | — | ||
| 7/16" | 0.272" | Seamless | Yes | 70,000 | Rockwell C16 (Medium) | Rockwell C49 | SAE AMS6360, SAE AMS-T-6736 | 89955K759 | — | — | 00000 | 00000 | — | 00000 | — | — | ||
| 1/2" | 0.334" | Seamless | Yes | 70,000 | Rockwell C16 (Medium) | Rockwell C49 | SAE AMS6360, SAE AMS-T-6736 | 89955K569 | — | — | 00000 | 00000 | — | 00000 | 00000 | — | ||
| 9/16" | 0.397" | Seamless | Yes | 70,000 | Rockwell C16 (Medium) | Rockwell C49 | SAE AMS6360, SAE AMS-T-6736 | 89955K799 | — | — | 00000 | 00000 | — | 00000 | — | — | ||
| 5/8" | 0.459" | Seamless | Yes | 70,000 | Rockwell C16 (Medium) | Rockwell C49 | SAE AMS6360, SAE AMS-T-6736 | 89955K589 | — | — | 00000 | 00000 | — | 00000 | — | — | ||
| 3/4" | 0.584" | Seamless | Yes | 70,000 | Rockwell C16 (Medium) | Rockwell C49 | SAE AMS6360, SAE AMS-T-6736 | 89955K629 | — | — | 00000 | 00000 | — | 00000 | — | — | ||
| 7/8" | 0.709" | Seamless | Yes | 70,000 | Rockwell C16 (Medium) | Rockwell C49 | SAE AMS6360, SAE AMS-T-6736 | 89955K879 | — | — | 00000 | 00000 | — | 00000 | — | — | ||
| 1" | 0.834" | Seamless | Yes | 70,000 | Rockwell C19 (Medium) | Not Rated | SAE AMS6360, SAE AMS-T-6736 | 89955K649 | — | — | 00000 | 00000 | 00000 | 00000 | 00000 | — | ||
| 1 1/8" | 0.959" | Seamless | Yes | 70,000 | Rockwell C16 (Medium) | Rockwell C49 | SAE AMS6360, SAE AMS-T-6736 | 89955K949 | — | — | 00000 | 00000 | — | 00000 | — | — | ||
| 1 1/4" | 1.084" | Seamless | Yes | 70,000 | Rockwell C19 (Medium) | Not Rated | SAE AMS6360, SAE AMS-T-6736 | 89955K669 | — | — | 00000 | 00000 | — | 00000 | 000000 | — | ||
| 1 3/8" | 1.209" | Seamless | Yes | 70,000 | Rockwell C16 (Medium) | Rockwell C49 | SAE AMS6360, SAE AMS-T-6736 | 89955K139 | — | — | 00000 | 00000 | — | 00000 | — | — | ||
| 1 1/2" | 1.334" | Seamless | Yes | 70,000 | Rockwell C16 (Medium) | Rockwell C49 | SAE AMS6360, SAE AMS-T-6736 | 89955K689 | — | — | 00000 | 00000 | — | 00000 | — | — | ||
| 1 5/8" | 1.459" | Seamless | Yes | 70,000 | Rockwell C16 (Medium) | Rockwell C49 | SAE AMS6360, SAE AMS-T-6736 | 89955K258 | — | — | 00000 | 00000 | — | 000000 | — | — | ||
| 1 3/4" | 1.584" | Seamless | Yes | 70,000 | Rockwell C16 (Medium) | Rockwell C49 | SAE AMS6360, SAE AMS-T-6736 | 89955K319 | — | — | 00000 | 00000 | — | 000000 | — | — | ||
| 2" | 1.834" | Seamless | Yes | 70,000 | Rockwell C16 (Medium) | Rockwell C49 | SAE AMS6360, SAE AMS-T-6736 | 89955K719 | — | — | 00000 | 00000 | — | 000000 | — | — | ||
0.095" Thick Wall | ||||||||||||||||||
| 5/16" | 0.123" | Seamless | Yes | 70,000 | Rockwell C16 (Medium) | Rockwell C49 | SAE AMS6360, SAE AMS-T-6736 | 89955K268 | — | — | 00000 | 00000 | — | 00000 | — | — | ||
| 7/16" | 0.248" | Seamless | Yes | 70,000 | Rockwell C16 (Medium) | Rockwell C49 | SAE AMS6360, SAE AMS-T-6736 | 89955K278 | — | — | 00000 | 00000 | — | 00000 | — | — | ||
| 1/2" | 0.31" | Seamless | Yes | 70,000 | Rockwell C16 (Medium) | Rockwell C49 | SAE AMS6360, SAE AMS-T-6736 | 89955K288 | — | 000000 | 00000 | 00000 | — | 00000 | — | — | ||
| 3/4" | 0.56" | Seamless | Yes | 70,000 | Rockwell C16 (Medium) | Rockwell C49 | SAE AMS6360, SAE AMS-T-6736 | 89955K298 | — | — | 00000 | 00000 | — | 00000 | — | — | ||
| 1" | 0.81" | Seamless | Yes | 70,000 | Rockwell C19 (Medium) | Not Rated | SAE AMS6360, SAE AMS-T-6736 | 89955K318 | — | 00000 | 00000 | 00000 | 00000 | 00000 | 000000 | — | ||
| 1 1/8" | 0.935" | Seamless | Yes | 70,000 | Rockwell C16 (Medium) | Rockwell C49 | SAE AMS6360, SAE AMS-T-6736 | 89955K328 | — | — | 00000 | 00000 | — | 00000 | — | — | ||
| 1 1/4" | 1.06" | Seamless | Yes | 70,000 | Rockwell C19 (Medium) | Not Rated | SAE AMS6360, SAE AMS-T-6736 | 89955K338 | — | 00000 | 00000 | 00000 | 00000 | 000000 | 000000 | — | ||
| 1 3/8" | 1.185" | Seamless | Yes | 70,000 | Rockwell C16 (Medium) | Rockwell C49 | SAE AMS6360, SAE AMS-T-6736 | 89955K348 | — | 00000 | 00000 | 00000 | — | 000000 | — | — | ||
| 1 1/2" | 1.31" | Seamless | Yes | 70,000 | Rockwell C16 (Medium) | Rockwell C49 | SAE AMS6360, SAE AMS-T-6736 | 89955K358 | — | — | 00000 | 00000 | — | 000000 | 000000 | — | ||
| 1 5/8" | 1.435" | Seamless | Yes | 70,000 | Rockwell C16 (Medium) | Rockwell C49 | SAE AMS6360, SAE AMS-T-6736 | 89955K368 | — | — | 00000 | 00000 | — | 000000 | — | — | ||
| 1 3/4" | 1.56" | Seamless | Yes | 70,000 | Rockwell C16 (Medium) | Rockwell C49 | SAE AMS6360, SAE AMS-T-6736 | 89955K378 | — | — | 00000 | 00000 | — | 000000 | — | — | ||
| 2" | 1.81" | Seamless | Yes | 70,000 | Rockwell C16 (Medium) | Rockwell C49 | SAE AMS6360, SAE AMS-T-6736 | 89955K388 | — | — | 00000 | 00000 | — | 000000 | — | — | ||
| 2 1/2" | 2.31" | Seamless | Yes | 70,000 | Rockwell C16 (Medium) | Rockwell C49 | SAE AMS6360, SAE AMS-T-6736 | 89955K398 | — | 00000 | 00000 | 00000 | — | 000000 | — | — | ||
0.12" Thick Wall | ||||||||||||||||||
| 3/8" | 0.135" | Seamless | Yes | 70,000 | Rockwell C16 (Medium) | Rockwell C49 | SAE AMS6360, SAE AMS-T-6736 | 89955K729 | — | — | 00000 | 00000 | 00000 | 00000 | 00000 | — | ||
| 7/16" | 0.198" | Seamless | Yes | 70,000 | Rockwell C16 (Medium) | Rockwell C49 | SAE AMS6360, SAE AMS-T-6736 | 89955K769 | — | — | 00000 | 00000 | — | 00000 | — | — | ||
| 1/2" | 0.26" | Seamless | Yes | 70,000 | Rockwell C16 (Medium) | Rockwell C49 | SAE AMS6360, SAE AMS-T-6736 | 89955K779 | — | — | 00000 | 00000 | 00000 | 00000 | 00000 | — | ||
| 9/16" | 0.323" | Seamless | Yes | 70,000 | Rockwell C16 (Medium) | Rockwell C49 | SAE AMS6360, SAE AMS-T-6736 | 89955K819 | — | — | 00000 | 00000 | — | 00000 | — | — | ||
| 5/8" | 0.385" | Seamless | Yes | 70,000 | Rockwell C16 (Medium) | Rockwell C49 | SAE AMS6360, SAE AMS-T-6736 | 89955K829 | — | — | 00000 | 00000 | 00000 | 00000 | 00000 | 000000 | ||
| 3/4" | 0.51" | Seamless | Yes | 70,000 | Rockwell C19 (Medium) | Not Rated | SAE AMS6360, SAE AMS-T-6736 | 89955K839 | — | — | 00000 | 00000 | 00000 | 00000 | 00000 | 000000 | ||
| 7/8" | 0.635" | Seamless | Yes | 70,000 | Rockwell C16 (Medium) | Rockwell C49 | SAE AMS6360, SAE AMS-T-6736 | 89955K889 | — | 00000 | 00000 | 00000 | 00000 | 00000 | 000000 | — | ||
| 1" | 0.76" | Seamless | Yes | 70,000 | Rockwell C19 (Medium) | Not Rated | SAE AMS6360, SAE AMS-T-6736 | 89955K899 | — | 00000 | 00000 | 00000 | 00000 | 00000 | 000000 | 000000 | ||
| 1 1/8" | 0.885" | Seamless | Yes | 70,000 | Rockwell C16 (Medium) | Rockwell C49 | SAE AMS6360, SAE AMS-T-6736 | 89955K959 | — | — | 00000 | 00000 | — | 000000 | — | — | ||
| 1 1/4" | 1.01" | Seamless | Yes | 70,000 | Rockwell C19 (Medium) | Not Rated | SAE AMS6360, SAE AMS-T-6736 | 89955K969 | — | 00000 | 00000 | 00000 | 00000 | 000000 | 000000 | — | ||
| 1 3/8" | 1.135" | Seamless | Yes | 70,000 | Rockwell C16 (Medium) | Rockwell C49 | SAE AMS6360, SAE AMS-T-6736 | 89955K169 | — | 00000 | 00000 | 00000 | 00000 | 000000 | 000000 | — | ||
| 1 1/2" | 1.26" | Seamless | Yes | 70,000 | Rockwell C19 (Medium) | Not Rated | SAE AMS6360, SAE AMS-T-6736 | 89955K179 | — | 00000 | 00000 | 00000 | 00000 | 000000 | 000000 | — | ||
| 1 3/4" | 1.51" | Seamless | Yes | 70,000 | Rockwell C19 (Medium) | Not Rated | SAE AMS6360, SAE AMS-T-6736 | 89955K349 | 000000 | 00000 | 00000 | 00000 | 00000 | 000000 | 000000 | — | ||
| 2" | 1.76" | Seamless | Yes | 70,000 | Rockwell C16 (Medium) | Rockwell C49 | SAE AMS6360, SAE AMS-T-6736 | 89955K419 | — | 00000 | 00000 | 00000 | — | 000000 | — | — | ||
| 2 1/4" | 2.01" | Seamless | Yes | 70,000 | Rockwell C19 (Medium) | Not Rated | SAE AMS6360, SAE AMS-T-6736 | 89955K529 | 00000 | 00000 | 00000 | 00000 | — | 000000 | — | — | ||
| 2 1/2" | 2.26" | Seamless | Yes | 70,000 | Rockwell C16 (Medium) | Rockwell C49 | SAE AMS6360, SAE AMS-T-6736 | 89955K549 | — | 00000 | 00000 | 000000 | — | 000000 | — | — | ||
| 3" | 2.76" | Seamless | Yes | 70,000 | Rockwell C16 (Medium) | Rockwell C49 | SAE AMS6360, SAE AMS-T-6736 | 89955K619 | — | — | 00000 | 000000 | — | 000000 | — | — | ||
0.156" Thick Wall | ||||||||||||||||||
| 5/8" | 0.313" | Seamless | Yes | 70,000 | Rockwell C16 (Medium) | Rockwell C49 | SAE AMS6360, SAE AMS-T-6736 | 89955K418 | — | 00000 | 00000 | 00000 | — | 000000 | — | — | ||
0.188" Thick Wall | ||||||||||||||||||
| 5/8" | 0.249" | Seamless | Yes | 70,000 | Rockwell C16 (Medium) | Rockwell C49 | SAE AMS6360, SAE AMS-T-6736 | 89955K998 | — | 00000 | 00000 | 00000 | — | 00000 | — | — | ||
| 3/4" | 0.374" | Seamless | Yes | 70,000 | Rockwell C16 (Medium) | Rockwell C49 | SAE AMS6360, SAE AMS-T-6736 | 89955K201 | — | 00000 | 00000 | 00000 | 00000 | 00000 | 000000 | — | ||
| 1" | 0.624" | Seamless | Yes | 70,000 | Rockwell C19 (Medium) | Not Rated | SAE AMS6360, SAE AMS-T-6736 | 89955K301 | 00000 | 00000 | 00000 | 00000 | 00000 | 000000 | 000000 | — | ||
| 1 1/8" | 0.749" | Seamless | Yes | 70,000 | Rockwell C16 (Medium) | Rockwell C49 | SAE AMS6360, SAE AMS-T-6736 | 89955K401 | — | 00000 | 00000 | 00000 | — | 000000 | — | — | ||
| 1 1/4" | 0.874" | Seamless | Yes | 70,000 | Rockwell C16 (Medium) | Rockwell C49 | SAE AMS6360, SAE AMS-T-6736 | 89955K428 | — | 00000 | 00000 | 00000 | — | 000000 | — | — | ||
| 1 1/2" | 1.124" | Seamless | Yes | 70,000 | Rockwell C19 (Medium) | Not Rated | SAE AMS6360, SAE AMS-T-6736 | 89955K501 | — | 00000 | 00000 | 00000 | 000000 | 000000 | 000000 | — | ||
| 1 3/4" | 1.374" | Seamless | Yes | 70,000 | Rockwell C19 (Medium) | Not Rated | SAE AMS6360, SAE AMS-T-6736 | 89955K606 | — | — | 00000 | 000000 | — | 000000 | — | — | ||
| 2" | 1.624" | Seamless | Yes | 70,000 | Rockwell C16 (Medium) | Rockwell C49 | SAE AMS6360, SAE AMS-T-6736 | 89955K601 | — | 00000 | 00000 | 000000 | — | 000000 | — | — | ||
| 2 1/2" | 2.124" | Seamless | Yes | 70,000 | Rockwell C16 (Medium) | Rockwell C49 | SAE AMS6360, SAE AMS-T-6736 | 89955K701 | — | 00000 | 00000 | 000000 | — | 000000 | — | — | ||
1/4" Thick Wall | ||||||||||||||||||
| 1" | 1/2" | Seamless | Yes | 70,000 | Rockwell C16 (Medium) | Rockwell C49 | SAE AMS6360, SAE AMS-T-6736 | 89955K801 | 00000 | 00000 | 00000 | 00000 | 00000 | 000000 | 000000 | — | ||
| 1 1/8" | 5/8" | Seamless | Yes | 70,000 | Rockwell C19 (Medium) | Not Rated | SAE AMS6360, SAE AMS-T-6736 | 89955K607 | — | — | 00000 | 000000 | — | 000000 | — | — | ||
| 1 1/4" | 3/4" | Seamless | Yes | 70,000 | Rockwell C19 (Medium) | Not Rated | SAE AMS6360, SAE AMS-T-6736 | 89955K608 | — | — | 00000 | 000000 | — | 000000 | — | — | ||
| 1 1/2" | 1" | Seamless | Yes | 70,000 | Rockwell C19 (Medium) | Not Rated | SAE AMS6360, SAE AMS-T-6736 | 89955K609 | 00000 | 00000 | — | 000000 | — | 000000 | — | — | ||
| 1 3/4" | 1 1/4" | Seamless | Yes | 70,000 | Rockwell C19 (Medium) | Not Rated | SAE AMS6360, SAE AMS-T-6736 | 89955K612 | — | — | 00000 | 000000 | — | 000000 | — | — | ||
| 2" | 1 1/2" | Seamless | Yes | 70,000 | Rockwell C16 (Medium) | Rockwell C49 | SAE AMS6360, SAE AMS-T-6736 | 8305T23 | — | 00000 | — | — | — | — | — | — | ||
| 2" | 1 1/2" | Seamless | Yes | 70,000 | Rockwell C19 (Medium) | Not Rated | SAE AMS6360, SAE AMS-T-6736 | 89955K592 | 00000 | — | — | — | — | — | — | — | ||
| 2 1/2" | 2" | Seamless | Yes | 70,000 | Rockwell C19 (Medium) | Not Rated | SAE AMS6360, SAE AMS-T-6736 | 89955K615 | — | — | 00000 | 000000 | — | 000000 | — | — | ||
| 3" | 2 1/2" | Seamless | Yes | 70,000 | Rockwell C16 (Medium) | Rockwell C49 | SAE AMS6360, SAE AMS-T-6736 | 89955K901 | 00000 | 00000 | 00000 | 000000 | — | 000000 | — | — | ||
Weldable 4130 Alloy Steel Rectangular Tubes
 |
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.
Certificates with a traceable lot number are available for these products. Download certificates from ORDER HISTORY after your order ships.
Outside | Inside | Corner Shape | ||||||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
Ht. | Wd. | Ht. | Wd. | Inside | Outside | Fabrication | 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 | |||
0.035" Thick Wall | ||||||||||||||||||
| 3/8" | 3/8" | 0.305" | 0.305" | Round | Round | Seamless | 75,000 | Rockwell C20 (Hard) | Rockwell C49 | SAE AMS-T-6736 | 6582K21 | 000000 | 000000 | 000000 | 000000 | 000000 | ||
| 1/2" | 1/2" | 0.43" | 0.43" | Round | Round | Seamless | 75,000 | Rockwell C20 (Hard) | Rockwell C49 | SAE AMS-T-6736 | 6582K22 | 00000 | 00000 | 00000 | 00000 | 00000 | ||
| 1/2" | 1" | 0.43" | 0.93" | Round | Round | Seamless | 75,000 | Rockwell C20 (Hard) | Rockwell C49 | SAE AMS-T-6736 | 6566K25 | 00000 | 00000 | 00000 | 00000 | 00000 | ||
| 5/8" | 5/8" | 0.555" | 0.555" | Round | Round | Seamless | 75,000 | Rockwell C20 (Hard) | Rockwell C49 | SAE AMS-T-6736 | 6582K23 | 00000 | 00000 | 00000 | 00000 | 00000 | ||
| 3/4" | 3/4" | 0.68" | 0.68" | Round | Round | Seamless | 75,000 | Rockwell C20 (Hard) | Rockwell C49 | SAE AMS-T-6736 | 6582K24 | 00000 | 00000 | 00000 | 00000 | 000000 | ||
| 1" | 1" | 0.93" | 0.93" | Round | Round | Seamless | 75,000 | Rockwell C20 (Hard) | Rockwell C49 | SAE AMS-T-6736 | 6582K26 | 00000 | 00000 | 00000 | 00000 | 000000 | ||
0.049" Thick Wall | ||||||||||||||||||
| 1/2" | 1" | 0.402" | 0.902" | Round | Round | Seamless | 75,000 | Rockwell C20 (Hard) | Rockwell C49 | SAE AMS-T-6736 | 6566K52 | 00000 | 00000 | 00000 | 00000 | 00000 | ||
| 5/8" | 5/8" | 0.527" | 0.527" | Round | Round | Seamless | 75,000 | Rockwell C20 (Hard) | Rockwell C49 | SAE AMS-T-6736 | 6582K27 | 00000 | 00000 | 00000 | 00000 | 00000 | ||
| 3/4" | 3/4" | 0.652" | 0.652" | Round | Round | Seamless | 75,000 | Rockwell C20 (Hard) | Rockwell C49 | SAE AMS-T-6736 | 6582K28 | 00000 | 00000 | 00000 | 00000 | 00000 | ||
| 3/4" | 1 1/2" | 0.652" | 1.402" | Round | Round | Seamless | 75,000 | Rockwell C20 (Hard) | Rockwell C49 | SAE AMS-T-6736 | 6566K31 | 00000 | 00000 | 00000 | 00000 | 000000 | ||
| 1" | 1" | 0.902" | 0.902" | Round | Round | Seamless | 75,000 | Rockwell C20 (Hard) | Rockwell C49 | SAE AMS-T-6736 | 6582K29 | 00000 | 00000 | 00000 | 00000 | 000000 | ||
| 1" | 1 1/2" | 0.902" | 1.402" | Round | Round | Seamless | 75,000 | Rockwell C20 (Hard) | Rockwell C49 | SAE AMS-T-6736 | 6566K54 | 00000 | 00000 | 00000 | 00000 | 000000 | ||
0.065" Thick Wall | ||||||||||||||||||
| 1/2" | 1" | 0.37" | 0.87" | Round | Round | Seamless | 75,000 | Rockwell C20 (Hard) | Rockwell C49 | SAE AMS-T-6736 | 6566K33 | 00000 | 00000 | 00000 | 00000 | 000000 | ||
| 5/8" | 5/8" | 0.495" | 0.495" | Round | Round | Seamless | 75,000 | Rockwell C20 (Hard) | Rockwell C49 | SAE AMS-T-6736 | 6582K32 | 00000 | 00000 | 00000 | 00000 | 000000 | ||
| 3/4" | 3/4" | 0.62" | 0.62" | Round | Round | Seamless | 75,000 | Rockwell C20 (Hard) | Rockwell C49 | SAE AMS-T-6736 | 6582K41 | 00000 | 00000 | 00000 | 00000 | 000000 | ||
| 1" | 1" | 0.87" | 0.87" | Round | Round | Seamless | 75,000 | Rockwell C20 (Hard) | Rockwell C49 | SAE AMS-T-6736 | 6582K43 | 00000 | 00000 | 00000 | 00000 | 000000 | ||
| 1" | 1 1/2" | 0.87" | 1.37" | Round | Round | Seamless | 75,000 | Rockwell C20 (Hard) | Rockwell C49 | SAE AMS-T-6736 | 6566K34 | 00000 | 00000 | 00000 | 000000 | 000000 | ||
| 1" | 1 3/4" | 0.87" | 1.62" | Round | Round | Seamless | 75,000 | Rockwell C20 (Hard) | Rockwell C49 | SAE AMS-T-6736 | 6566K35 | 00000 | 00000 | 00000 | 000000 | 000000 | ||
| 1" | 2" | 0.87" | 1.87" | Round | Round | Seamless | 75,000 | Rockwell C20 (Hard) | Rockwell C49 | SAE AMS-T-6736 | 6566K56 | 00000 | 00000 | 00000 | 000000 | 000000 | ||
