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Low-Carbon Steel Rectangular 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 fixture clamps, mounting plates, and spacers. This material can be surface hardened with heat treating.
For technical drawings and 3-D models, click on a part number.
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
- Specifications Met: See table
Outside | Inside | |||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Ht. | Ht. Tolerance | Wd. | Wd. Tolerance | Ht. | Wd. | Yield Strength, psi  | Specifications Met | Straightness Tolerance | 1 ft. Lg. | 3 ft. Lg. | 6 ft. Lg. | |
0.049" Wall Thick. (-0.005" to 0.005" Tolerance) | ||||||||||||
| 1/2" | -0.004" to 0.004" | 1/2" | -0.004" to 0.004" | 0.402" | 0.402" | Not Rated | ASTM A513 | __ | 0000000 | |||
| 5/8" | -0.004" to 0.004" | 5/8" | -0.004" to 0.004" | 0.527" | 0.527" | Not Rated | ASTM A513 | __ | 0000000 | |||
| 3/4" | -0.005" to 0.005" | 3/4" | -0.005" to 0.005" | 0.652" | 0.652" | Not Rated | ASTM A513 | __ | 0000000 | |||
0.065" Wall Thick. (-0.007" to 0.007" Tolerance) | ||||||||||||
| 1/2" | -0.03" to 0.03" | 1/2" | -0.03" to 0.03" | 0.37" | 0.37" | 32,000 | ASTM A513 | 1/16" per 3 ft. | 00000000 | |||
| 1/2" | -0.008" to 0.008" | 1 1/2" | -0.008" to 0.008" | 0.37" | 1.37" | 32,000 | ASTM A513 Type 1 | 1/16" per 3 ft. | 0000000 | |||
| 1/2" | -0.005" to 0.005" | 1" | -0.005" to 0.005" | 0.37" | 0.87" | Not Rated | ASTM A513 | __ | 0000000 | |||
| 5/8" | -0.004" to 0.004" | 5/8" | -0.004" to 0.004" | 0.495" | 0.495" | Not Rated | ASTM A513 | __ | 0000000 | |||
| 3/4" | -0.03" to 0.03" | 3/4" | -0.03" to 0.03" | 0.62" | 0.62" | 32,000 | ASTM A513 | 1/16" per 3 ft. | 00000000 | |||
| 1" | -0.03" to 0.03" | 1" | -0.03" to 0.03" | 0.87" | 0.87" | 32,000 | ASTM A513 | 1/16" per 3 ft. | 00000000 | |||
| 1" | -0.01" to 0.01" | 3" | -0.01" to 0.01" | 0.87" | 2.87" | Not Rated | ASTM A513 | __ | 0000000 | |||
| 1" | -0.008" to 0.008" | 2" | -0.008" to 0.008" | 0.87" | 1.87" | Not Rated | ASTM A513 | __ | 0000000 | |||
| 1" | -0.006" to 0.006" | 1 1/2" | -0.006" to 0.006" | 0.87" | 1.37" | Not Rated | ASTM A513 | __ | 0000000 | |||
| 1 1/4" | -0.03" to 0.03" | 1 1/4" | -0.03" to 0.03" | 1.12" | 1.12" | 32,000 | ASTM A513 | 1/16" per 3 ft. | 00000000 | |||
| 1 1/2" | -0.006" to 0.006" | 1 1/2" | -0.006" to 0.006" | 1.37" | 1.37" | 32,000 | ASTM A513 Type 1 | 1/16" per 3 ft. | 0000000 | |||
| 2" | -0.008" to 0.008" | 2" | -0.008" to 0.008" | 1.87" | 1.87" | Not Rated | ASTM A513 | __ | 0000000 | |||
0.083" Wall Thick. (-0.008" to 0.008" Tolerance) | ||||||||||||
| 3/4" | -0.03" to 0.03" | 3/4" | -0.03" to 0.03" | 0.584" | 0.584" | 32,000 | ASTM A513 | 1/16" per 3 ft. | 00000000 | |||
| 3/4" | -0.006" to 0.006" | 1 1/2" | -0.006" to 0.006" | 0.584" | 1.334" | Not Rated | ASTM A513 | __ | 000000 | |||
| 1" | -0.03" to 0.03" | 1" | -0.03" to 0.03" | 0.834" | 0.834" | 32,000 | ASTM A513 | 1/16" per 3 ft. | 00000000 | |||
| 1" | -0.01" to 0.01" | 1 1/2" | -0.01" to 0.01" | 0.834" | 1.334" | Not Rated | ASTM A513 | __ | 0000000 | |||
| 1" | -0.01" to 0.01" | 3" | -0.01" to 0.01" | 0.834" | 2.834" | Not Rated | ASTM A513 | __ | 0000000 | |||
| 1" | -0.008" to 0.008" | 2" | -0.008" to 0.008" | 0.834" | 1.834" | Not Rated | ASTM A513 | __ | 0000000 | |||
| 1 1/4" | -0.006" to 0.006" | 1 1/4" | -0.006" to 0.006" | 1.084" | 1.084" | Not Rated | ASTM A513 | __ | 0000000 | |||
| 1 1/2" | -0.03" to 0.03" | 1 1/2" | -0.03" to 0.03" | 1.334" | 1.334" | 32,000 | ASTM A513 | 1/16" per 3 ft. | 00000000 | |||
| 2" | -0.03" to 0.03" | 2" | -0.03" to 0.03" | 1.834" | 1.834" | 32,000 | ASTM A513 | 1/16" per 3 ft. | 00000000 | |||
| 2" | -0.02" to 0.02" | 4" | -0.02" to 0.02" | 1.834" | 3.834" | Not Rated | ASTM A513 | __ | 0000000 | |||
| 2 1/2" | -0.01" to 0.01" | 2 1/2" | -0.01" to 0.01" | 2.334" | 2.334" | Not Rated | ASTM A513 | __ | 0000000 | |||
0.12" Wall Thick. (-0.012" to 0.012" Tolerance) | ||||||||||||
| 3/4" | -0.005" to 0.005" | 3/4" | -0.005" to 0.005" | 0.51" | 0.51" | Not Rated | ASTM A513 | __ | 0000000 | |||
| 1" | -0.03" to 0.03" | 1" | -0.03" to 0.03" | 0.76" | 0.76" | 46,000 | ASTM A500 | 1/16" per 3 ft. | 00000000 | |||
| 1" | -0.008" to 0.008" | 2" | -0.008" to 0.008" | 0.76" | 1.76" | Not Rated | ASTM A513 | __ | 0000000 | |||
| 1" | -0.006" to 0.006" | 1 1/2" | -0.006" to 0.006" | 0.76" | 1.26" | Not Rated | ASTM A513 | __ | 0000000 | |||
| 1 1/4" | -0.006" to 0.006" | 1 1/4" | -0.006" to 0.006" | 1.01" | 1.01" | Not Rated | ASTM A513 | __ | 0000000 | |||
| 1 1/2" | -0.03" to 0.03" | 1 1/2" | -0.03" to 0.03" | 1.26" | 1.26" | 32,000 | ASTM A513 | 1/16" per 3 ft. | 00000000 | |||
| 1 1/2" | -0.01" to 0.01" | 2 1/2" | -0.01" to 0.01" | 1.26" | 2.26" | 46,000 | ASTM A513 Type 1 | 1/16" per 3 ft. | 0000000 | |||
| 2" | -0.03" to 0.03" | 2" | -0.03" to 0.03" | 1.76" | 1.76" | 46,000 | ASTM A500 | 1/16" per 3 ft. | 00000000 | |||
1/8" Wall Thick. (-0.013" to 0.013" Tolerance) | ||||||||||||
| 1" | -0.025" to 0.025" | 3" | -0.025" to 0.025" | 3/4" | 2 3/4" | 46,000 | ASTM A500 | __ | 0000000 | |||
| 1 1/2" | -0.025" to 0.025" | 3" | -0.025" to 0.025" | 1 1/4" | 2 3/4" | 46,000 | ASTM A500 | __ | 0000000 | |||
| 2 1/2" | -0.03" to 0.03" | 2 1/2" | -0.03" to 0.03" | 2 1/4" | 2 1/4" | 46,000 | ASTM A500 | 1/16" per 3 ft. | 00000000 | |||
| 3" | -0.03" to 0.03" | 3" | -0.03" to 0.03" | 2 3/4" | 2 3/4" | 46,000 | ASTM A500 | 1/16" per 3 ft. | 00000000 | |||
| 3 1/2" | -0.03" to 0.03" | 3 1/2" | -0.03" to 0.03" | 3 1/4" | 3 1/4" | 46,000 | ASTM A500 | 1/16" per 3 ft. | 00000000 | |||
| 4" | -0.03" to 0.03" | 4" | -0.03" to 0.03" | 3 3/4" | 3 3/4" | 46,000 | ASTM A500 | 1/16" per 3 ft. | 00000000 | |||
0.188" Wall Thick. (-0.019" to 0.019" Tolerance) | ||||||||||||
| 1 1/4" | -0.02" to 0.02" | 1 1/4" | -0.02" to 0.02" | 0.874" | 0.874" | 46,000 | ASTM A500 | __ | 0000000 | |||
| 1 1/2" | -0.025" to 0.025" | 3" | -0.025" to 0.025" | 1.124" | 2.624" | 46,000 | ASTM A500 | __ | 0000000 | |||
| 2" | -0.03" to 0.03" | 2" | -0.03" to 0.03" | 1.624" | 1.624" | 46,000 | ASTM A500 | 1/16" per 3 ft. | 00000000 | |||
| 2 1/2" | -0.02" to 0.02" | 2 1/2" | -0.02" to 0.02" | 2.124" | 2.124" | 46,000 | ASTM A500 | __ | 0000000 | |||
| 3" | -0.03" to 0.03" | 3" | -0.03" to 0.03" | 2.624" | 2.624" | 46,000 | ASTM A500 | 1/16" per 3 ft. | 00000000 | |||
| 4" | -0.03" to 0.03" | 4" | -0.03" to 0.03" | 3.624" | 3.624" | 46,000 | ASTM A500 | 1/16" per 3 ft. | 00000000 | |||
1/4" Wall Thick. (-0.025" to 0.025" Tolerance) | ||||||||||||
| 1 1/2" | -0.025" to 0.025" | 3" | -0.025" to 0.025" | 1" | 2 1/2" | 46,000 | ASTM A500 | __ | 0000000 | |||
| 2" | -0.03" to 0.03" | 2" | -0.03" to 0.03" | 1 1/2" | 1 1/2" | 46,000 | ASTM A500 | 1/16" per 3 ft. | 00000000 | |||
| 2 1/2" | -0.02" to 0.02" | 2 1/2" | -0.02" to 0.02" | 2" | 2" | 46,000 | ASTM A500 | __ | 0000000 | |||
| 3" | -0.03" to 0.03" | 3" | -0.03" to 0.03" | 2 1/2" | 2 1/2" | 46,000 | ASTM A500 | 1/16" per 3 ft. | 00000000 | |||
| 4" | -0.03" to 0.03" | 4" | -0.03" to 0.03" | 3 1/2" | 3 1/2" | 46,000 | ASTM A500 | 1/16" per 3 ft. | 00000000 | |||
| 6" | -0.06" to 0.06" | 6" | -0.06" to 0.06" | 5 1/2" | 5 1/2" | 46,000 | ASTM A500 | 1/16" per 3 ft. | 00000000 | |||
Metric Tubes
- Yield Strength: 34,000 psi
- Hardness: Rockwell B65 (Medium)
- Heat Treatable: Yes
- Max. Hardness After Heat Treatment: Not Rated
Outside, mm | Inside, mm | ||||||||
|---|---|---|---|---|---|---|---|---|---|
| Ht. | Ht. Tolerance | Wd. | Wd. Tolerance | Ht. | Wd. | 1 ft. Lg. | 3 ft. Lg. | 6 ft. Lg. | |
1 mm Wall Thick. (-0.15 to 0.15 mm Tolerance) | |||||||||
| 12 | -0.2 to 0.2 | 12 | -0.2 to 0.2 | 10 | 10 | 0000000 | |||
2 mm Wall Thick. (-0.1 to 0.1 mm Tolerance) | |||||||||
| 25 | -0.3 to 0.3 | 50 | -0.3 to 0.3 | 21 | 46 | 0000000 | |||
| 25 | -0.25 to 0.25 | 25 | -0.25 to 0.25 | 21 | 21 | 0000000 | |||
| 40 | -0.3 to 0.3 | 40 | -0.3 to 0.3 | 36 | 36 | 0000000 | |||
| 55 | -0.35 to 0.35 | 55 | -0.35 to 0.35 | 51 | 51 | 0000000 | |||
3 mm Wall Thick. (-0.1 to 0.1 mm Tolerance) | |||||||||
| 100 | -0.65 to 0.65 | 100 | -0.65 to 0.65 | 94 | 94 | 0000000 | |||
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
- Specifications Met: SAE AMS-T-6736, MIL-T-6736
4130 alloy steel has a low carbon content for good weldability. It's often used for structural applications.
For technical drawings and 3-D models, click on a part number.
Certificates with a traceable lot number are available for these products. Download certificates from ORDER HISTORY after your order ships.
Outside | Inside | ||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|
| Ht. | Ht. Tolerance | Wd. | Wd. Tolerance | Ht. | Wd. | 1/2 ft. Lg. | 1 ft. Lg. | 2 ft. Lg. | 3 ft. Lg. | 6 ft. Lg. | |
0.035" Wall Thick. (-0.004" to 0.004" Tolerance) | |||||||||||
| 3/8" | -0.020" to 0.020" | 3/8" | -0.020" to 0.020" | 0.305" | 0.305" | 0000000 | |||||
| 1/2" | -0.020" to 0.020" | 1/2" | -0.020" to 0.020" | 0.43" | 0.43" | 0000000 | |||||
| 1/2" | -0.020" to 0.020" | 1" | -0.020" to 0.020" | 0.43" | 0.93" | 0000000 | |||||
| 5/8" | -0.020" to 0.020" | 5/8" | -0.020" to 0.020" | 0.555" | 0.555" | 0000000 | |||||
| 3/4" | -0.020" to 0.020" | 3/4" | -0.020" to 0.020" | 0.68" | 0.68" | 0000000 | |||||
| 1" | -0.020" to 0.020" | 1" | -0.020" to 0.020" | 0.93" | 0.93" | 0000000 | |||||
0.049" Wall Thick. (-0.005" to 0.005" Tolerance) | |||||||||||
| 1/2" | -0.020" to 0.020" | 1" | -0.020" to 0.020" | 0.402" | 0.902" | 0000000 | |||||
| 5/8" | -0.020" to 0.020" | 5/8" | -0.020" to 0.020" | 0.527" | 0.527" | 0000000 | |||||
| 3/4" | -0.020" to 0.020" | 3/4" | -0.020" to 0.020" | 0.652" | 0.652" | 0000000 | |||||
| 3/4" | -0.020" to 0.020" | 1 1/2" | -0.020" to 0.020" | 0.652" | 1.402" | 0000000 | |||||
| 1" | -0.020" to 0.020" | 1" | -0.020" to 0.020" | 0.902" | 0.902" | 0000000 | |||||
| 1" | -0.020" to 0.020" | 1 1/2" | -0.020" to 0.020" | 0.902" | 1.402" | 0000000 | |||||
0.065" Wall Thick. (-0.007" to 0.007" Tolerance) | |||||||||||
| 1/2" | -0.020" to 0.020" | 1" | -0.020" to 0.020" | 0.37" | 0.87" | 0000000 | |||||
| 5/8" | -0.020" to 0.020" | 5/8" | -0.020" to 0.020" | 0.495" | 0.495" | 0000000 | |||||
| 3/4" | -0.020" to 0.020" | 3/4" | -0.020" to 0.020" | 0.62" | 0.62" | 0000000 | |||||
| 1" | -0.020" to 0.020" | 1" | -0.020" to 0.020" | 0.87" | 0.87" | 0000000 | |||||
| 1" | -0.020" to 0.020" | 1 1/2" | -0.020" to 0.020" | 0.87" | 1.37" | 0000000 | |||||
| 1" | -0.020" to 0.020" | 1 3/4" | -0.020" to 0.020" | 0.87" | 1.62" | 0000000 | |||||
| 1" | -0.020" to 0.020" | 2" | -0.020" to 0.020" | 0.87" | 1.87" | 0000000 | |||||
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.
Straight Connectors
For Outside Rail | Outside | Inside | ||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Weld-Together Framing Component Shape | Ht. | Wd. | Ht. | Wd. | Ht. | Wd. | Wall Thick. | Lg. (A) | Yield Strength, psi | Material | Each | |
| Straight | 1 1/2" | 1 1/2" | 1 13/16" | 1 13/16" | 1 9/16" | 1 9/16" | 0.121" | 4" | 80,000 | Carbon Steel | 0000000 | 000000 |
Tee Connectors
Cross Connectors
Cross
Five-Way Cross
For Outside Rail | Outside | Inside | Lg. | |||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Weld-Together Framing Component Shape | Ht. | Wd. | Ht. | Wd. | Ht. | Wd. | Wall Thick. | (A) | (B) | (C) | Yield Strength, psi | Material | Each | |
| Cross | 1 1/2" | 1 1/2" | 1 13/16" | 1 13/16" | 1 9/16" | 1 9/16" | 0.121" | 8 3/16" | 8 3/16" | __ | 80,000 | Carbon Steel | 0000000 | 0000000 |
| Cross | 2" | 2" | 2 5/16" | 2 5/16" | 2 1/16" | 2 1/16" | 0.121" | 9 11/16" | 9 11/16" | __ | 80,000 | Carbon Steel | 0000000 | 000000 |
| Five-Way Cross | 1 1/2" | 1 1/2" | 1 13/16" | 1 13/16" | 1 9/16" | 1 9/16" | 0.121" | 8 3/16" | 8 3/16" | 3 3/16" | 80,000 | Carbon Steel | 0000000 | 000000 |
| Five-Way Cross | 2" | 2" | 2 5/16" | 2 5/16" | 2 1/16" | 2 1/16" | 0.121" | 9 11/16" | 9 11/16" | 3 11/16" | 80,000 | Carbon Steel | 0000000 | 000000 |
Telescoping Weld-Together Rails
Create posts of varying lengths. To telescope rails, slide one length of rail into the next larger size rail (for example, a 1 3/4" height rail fits into a 2" height rail and a 3/4" dia. rail fits into a 1" dia. rail). Weld the rails together at the desired length to create strong structures. These rails are not compatible with weld-together framing and fittings.
Carbon steel rails are lightly oiled.
Galvanized carbon steel rails have good corrosion resistance in wet environments and can be used outdoors.
For technical drawings and 3-D models, click on a part number.
Square
Two Square Rails Shown Telescoping (Sold Separately)
Square
Rail | |||||||||
|---|---|---|---|---|---|---|---|---|---|
| Ht. | Wd. | Wall Thick. | Lg. Tolerance | 2 ft. | 4 ft. | 6 ft. | 8 ft. | 12 ft. | |
Carbon Steel | |||||||||
| 3/4" | 3/4" | 0.08" | 0" to +0.125" | 0000000 | |||||
| 1" | 1" | 0.08" | 0" to +0.125" | 0000000 | |||||
| 1 3/4" | 1 3/4" | 0.105" | 0.25" to +0.5" | 00000000 | |||||
| 2" | 2" | 0.105" | 0.25" to +0.5" | 00000000 | |||||
| 2 1/4" | 2 1/4" | 0.105" | 0.25" to +0.5" | 00000000 | |||||
| 2 1/2" | 2 1/2" | 0.105" | 0.25" to +0.5" | 00000000 | |||||
Galvanized Carbon Steel | |||||||||
| 1 3/4" | 1 3/4" | 0.105" | 0.25" to +0.5" | 00000000 | |||||
| 2" | 2" | 0.105" | 0.25" to +0.5" | 00000000 | |||||
| 2 1/4" | 2 1/4" | 0.105" | 0.25" to +0.5" | 00000000 | |||||
| 2 1/2" | 2 1/2" | 0.105" | 0.25" to +0.5" | 00000000 | |||||
Steel Bolt-Together Framing and Fittings
Rails are drilled with consistently spaced holes for multiple mounting options that do not require machining. Use this bolt-together framing to build guards, tables, and racks.
For technical drawings and 3-D models, click on a part number.
Rails
Rails have bolt holes on all four sides. Connect multiple rails with brackets or slide one length of rail into the next larger size and bolt together using curved-bolt or locking-pin connectors. Select connectors based on the larger size rail in the connection.
Galvanized steel rails have good corrosion resistance in wet environments.
Steel rails are lightly oiled.
Rail | ||||||||
|---|---|---|---|---|---|---|---|---|
| Ht. | Wd. | Wall Thick. | 3 ft. | 4 ft. | 6 ft. | 8 ft. | 12 ft. | |
Galvanized Steel | ||||||||
| 1" | 1" | 0.083" | 00000000 | |||||
| 1" | 1" | 0.105" | 00000000 | |||||
| 1 1/4" | 1 1/4" | 0.083" | 00000000 | |||||
| 1 1/4" | 1 1/4" | 0.105" | 00000000 | |||||
| 1 1/2" | 1 1/2" | 0.083" | 00000000 | |||||
| 1 1/2" | 1 1/2" | 0.105" | 00000000 | |||||
| 1 3/4" | 1 3/4" | 0.105" | 00000000 | |||||
| 2" | 2" | 0.105" | 00000000 | |||||
| 2 1/4" | 2 1/4" | 0.105" | 00000000 | |||||
| 2 1/2" | 2 1/2" | 0.105" | 00000000 | |||||
Steel | ||||||||
| 1 1/2" | 1 1/2" | 0.105" | 00000000 | |||||
| 1 3/4" | 1 3/4" | 0.105" | 00000000 | |||||
| 2" | 2" | 0.105" | 00000000 | |||||
| 2 1/4" | 2 1/4" | 0.105" | 00000000 | |||||
| 2 1/2" | 2 1/2" | 0.105" | 00000000 | |||||
Telescoping Rail Sets
Telescoping rail sets include two rails that can be nested and locked together.
Rail | |||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|
| Outer Ht. | Outer Wd. | Inner Ht. | Inner Wd. | Wall Thick. | Material | Mounting Fasteners Included | Includes | 4 ft. | 6 ft. | 8 ft. | |
| 1 3/4" | 1 3/4" | 1 1/2" | 1 1/2" | 0.105" | Galvanized Steel | Yes | Locking Pin, Two Nestable Rails | 00000000 | |||
| 2" | 2" | 1 3/4" | 1 3/4" | 0.105" | Galvanized Steel | Yes | Locking Pin, Two Nestable Rails | 00000000 | |||
| 2 1/4" | 2 1/4" | 2" | 2" | 0.105" | Galvanized Steel | Yes | Locking Pin, Two Nestable Rails | 00000000 | |||
| 2 1/2" | 2 1/2" | 2 1/4" | 2 1/4" | 0.105" | Galvanized Steel | Yes | Locking Pin, Two Nestable Rails | 00000000 | |||