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About Steel
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 Rectangular Tubes
Also known as mild steel, low-carbon steel is easy to machine, form, and weld. These tubes are often fabricated into parts that don’t require high strength, such as frames, supports, and raceways. To increase their wear resistance, you can surface harden them with heat treating. These tubes are manufactured to ASTM or EN 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.
Tubes
- Yield Strength: See table
- Hardness: Not Rated
- Heat Treatable: Yes
- Max. Hardness After Heat Treatment: Not Rated
- Fabrication: Welded
- Specifications Met: See table
Outside | Inside | ||||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Ht. | Wd. | Ht. | Wd. | Yield Strength, psi  | Specifications Met | Straightness Tolerance | 1/2 ft. Lg. | 1 ft. Lg. | 2 ft. Lg. | 3 ft. Lg. | 4 ft. Lg. | 6 ft. Lg. | 8 ft. Lg. | 12 ft. Lg. | |
0.12" Wall Thick. | |||||||||||||||
| 1" | 1" | 0.76" | 0.76" | 46,000 | ASTM A500 | 1/16" per 3 ft. | 00000000 | ||||||||
| 2" | 2" | 1.76" | 1.76" | 46,000 | ASTM A500 | 1/16" per 3 ft. | 00000000 | ||||||||
| 2" | 3" | 1.76" | 2.76" | 39,000 | ASTM A500 | __ | 00000000 | ||||||||
| 2" | 4" | 1.76" | 3.76" | 39,000 | ASTM A500 | __ | 00000000 | ||||||||
| 2" | 6" | 1.76" | 5.76" | 39,000 | ASTM A500 | __ | 00000000 | ||||||||
| 4" | 4" | 3.76" | 3.76" | 39,000 | ASTM A500 | __ | 00000000 | ||||||||
1/8" Wall Thick. | |||||||||||||||
| 1" | 2" | 3/4" | 1 3/4" | 46,000 | ASTM A500 | 1/16" per 3 ft. | 00000000 | ||||||||
| 1" | 3" | 3/4" | 2 3/4" | 32,000 | ASTM A500 | __ | 0000000 | ||||||||
| 1 1/2" | 1 1/2" | 1 1/4" | 1 1/4" | 46,000 | ASTM A500 | 1/16" per 3 ft. | 00000000 | ||||||||
| 1 1/2" | 2 1/2" | 1 1/4" | 2 1/4" | 46,000 | ASTM A500 | 1/16" per 3 ft. | 00000000 | ||||||||
| 1 1/2" | 3" | 1 1/4" | 2 3/4" | 46,000 | ASTM A500 | __ | 0000000 | ||||||||
| 2" | 2" | 1 3/4" | 1 3/4" | 46,000 | ASTM A500 | 1/16" per 3 ft. | 00000000 | ||||||||
| 2" | 3" | 1 3/4" | 2 3/4" | 46,000 | ASTM A500 | 0.075" per 3 ft. | 00000000 | ||||||||
| 2" | 4" | 1 3/4" | 3 3/4" | 39,000 | ASTM A500 | __ | 00000000 | ||||||||
| 2" | 5" | 1 3/4" | 4 3/4" | 39,000 | ASTM A500 | __ | 00000000 | ||||||||
| 2" | 6" | 1 3/4" | 5 3/4" | 39,000 | ASTM A500 | __ | 00000000 | ||||||||
| 2 1/2" | 2 1/2" | 2 1/4" | 2 1/4" | 46,000 | ASTM A500 | 1/16" per 3 ft. | 00000000 | ||||||||
| 3" | 3" | 2 3/4" | 2 3/4" | 46,000 | ASTM A500 | __ | 00000000 | ||||||||
| 3" | 4" | 2 3/4" | 3 3/4" | 39,000 | ASTM A500 | __ | 00000000 | ||||||||
| 3 1/2" | 3 1/2" | 3 1/4" | 3 1/4" | 39,000 | ASTM A500 | __ | 00000000 | ||||||||
| 4" | 4" | 3 3/4" | 3 3/4" | 46,000 | ASTM A500 | __ | 00000000 | ||||||||
0.188" Wall Thick. | |||||||||||||||
| 1 1/4" | 1 1/4" | 0.874" | 0.874" | 39,000 | ASTM A500 | __ | 0000000 | ||||||||
| 1 1/2" | 1 1/2" | 1.124" | 1.124" | 39,000 | ASTM A500 | __ | 00000000 | ||||||||
| 1 1/2" | 3" | 1.124" | 2.624" | 46,000 | ASTM A500 | __ | 0000000 | ||||||||
| 2" | 2" | 1.624" | 1.624" | 46,000 | ASTM A500 | 1/16" per 3 ft. | 00000000 | ||||||||
| 2" | 4" | 1.624" | 3.624" | 46,000 | ASTM A500 | 0.075" per 3 ft. | 00000000 | ||||||||
| 2" | 6" | 1.624" | 5.624" | 39,000 | ASTM A500 | __ | 00000000 | ||||||||
| 2 1/2" | 2 1/2" | 2.124" | 2.124" | 46,000 | ASTM A500 | __ | 0000000 | ||||||||
| 3" | 3" | 2.624" | 2.624" | 46,000 | ASTM A500 | __ | 00000000 | ||||||||
| 3" | 4" | 2.624" | 3.624" | 46,000 | ASTM A500 | 0.075" per 3 ft. | 00000000 | ||||||||
| 3" | 6" | 2.624" | 5.624" | 39,000 | ASTM A500 | __ | 00000000 | ||||||||
| 4" | 4" | 3.624" | 3.624" | 46,000 | ASTM A500 | __ | 00000000 | ||||||||
| 4" | 6" | 3.624" | 5.624" | 46,000 | ASTM A500 | 0.075" per 3 ft. | 00000000 | ||||||||
| 5" | 5" | 4.624" | 4.624" | 46,000 | ASTM A500 | 0.075" per 3 ft. | 00000000 | ||||||||
| 6" | 6" | 5.624" | 5.624" | 46,000 | ASTM A500 | 0.075" per 3 ft. | 00000000 | ||||||||
1/4" Wall Thick. | |||||||||||||||
| 1 1/2" | 1 1/2" | 1" | 1" | 39,000 | ASTM A500 | __ | 00000000 | ||||||||
| 1 1/2" | 3" | 1" | 2 1/2" | 46,000 | ASTM A500 | __ | 0000000 | ||||||||
| 2" | 2" | 1 1/2" | 1 1/2" | 46,000 | ASTM A500 | 1/16" per 3 ft. | 00000000 | ||||||||
| 2" | 3" | 1 1/2" | 2 1/2" | 46,000 | ASTM A500 | 0.075" per 3 ft. | 00000000 | ||||||||
| 2" | 4" | 1 1/2" | 3 1/2" | 46,000 | ASTM A500 | 0.075" per 3 ft. | 00000000 | ||||||||
| 2" | 6" | 1 1/2" | 5 1/2" | 46,000 | ASTM A500 | 0.075" per 3 ft. | 00000000 | ||||||||
| 2" | 8" | 1 1/2" | 7 1/2" | 39,000 | ASTM A500 | __ | 00000000 | ||||||||
| 2 1/2" | 2 1/2" | 2" | 2" | 46,000 | ASTM A500 | __ | 0000000 | ||||||||
| 3" | 3" | 2 1/2" | 2 1/2" | 46,000 | ASTM A500 | __ | 00000000 | ||||||||
| 3" | 4" | 2 1/2" | 3 1/2" | 46,000 | ASTM A500 | 0.075" per 3 ft. | 00000000 | ||||||||
| 3 1/2" | 3 1/2" | 3" | 3" | 39,000 | ASTM A500 | __ | 00000000 | ||||||||
| 4" | 4" | 3 1/2" | 3 1/2" | 46,000 | ASTM A500 | __ | 00000000 | ||||||||
| 4" | 6" | 3 1/2" | 5 1/2" | 46,000 | ASTM A500 | 0.075" per 3 ft. | 00000000 | ||||||||
| 4" | 8" | 3 1/2" | 7 1/2" | 39,000 | ASTM A500 | __ | 00000000 | ||||||||
| 5" | 5" | 4 1/2" | 4 1/2" | 39,000 | ASTM A500 | __ | 00000000 | ||||||||
| 6" | 6" | 5 1/2" | 5 1/2" | 46,000 | ASTM A500 | __ | 00000000 | ||||||||
5/16" Wall Thick. | |||||||||||||||
| 4" | 4" | 3 3/8" | 3 3/8" | 39,000 | ASTM A500 | __ | 00000000 | ||||||||
| 6" | 6" | 5 3/8" | 5 3/8" | 39,000 | ASTM A500 | __ | 00000000 | ||||||||
3/8" Wall Thick. | |||||||||||||||
| 3" | 3" | 2 1/4" | 2 1/4" | 39,000 | ASTM A500 | __ | 00000000 | ||||||||
| 4" | 4" | 3 1/4" | 3 1/4" | 39,000 | ASTM A500 | __ | 00000000 | ||||||||
| 6" | 6" | 5 1/4" | 5 1/4" | 46,000 | ASTM A500 | 0.075" per 3 ft. | 00000000 | ||||||||
| 8" | 8" | 7 1/4" | 7 1/4" | 46,000 | ASTM A500 | 0.075" per 3 ft. | 00000000 | ||||||||
1/2" Wall Thick. | |||||||||||||||
| 4" | 4" | 3" | 3" | 39,000 | ASTM A500 | __ | 00000000 | ||||||||
| 4" | 6" | 3" | 5" | 39,000 | ASTM A500 | __ | 00000000 | ||||||||
| 4" | 8" | 3" | 7" | 39,000 | ASTM A500 | __ | 00000000 | ||||||||
| 6" | 6" | 5" | 5" | 46,000 | ASTM A500 | 0.075" per 3 ft. | 00000000 | ||||||||
| 8" | 8" | 7" | 7" | 39,000 | ASTM A500 | __ | 00000000 | ||||||||
Weld-Together Framing and Fittings
Create strong structures by welding this framing together. Add metal panels to close off openings. Slide the rail into the fitting and weld in place.
For technical drawings and 3-D models, click on a part number.
