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Heat Treatable
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 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. | |
0.035" Wall Thick. | |||||||||||||||
| 1/2" | 1/2" | 0.43" | 0.43" | Not Rated | ASTM A513 Type 2 | __ | 00000000 | ||||||||
0.049" Wall Thick. | |||||||||||||||
| 1/2" | 1/2" | 0.402" | 0.402" | Not Rated | ASTM A513 Type 2 | __ | 0000000 | ||||||||
| 5/8" | 5/8" | 0.527" | 0.527" | Not Rated | ASTM A513 Type 2 | __ | 0000000 | ||||||||
| 3/4" | 3/4" | 0.652" | 0.652" | Not Rated | ASTM A513 Type 2 | __ | 0000000 | ||||||||
1/16" Wall Thick. | |||||||||||||||
| 1/2" | 1/2" | 3/8" | 3/8" | 32,000 | ASTM A513 Type 1 | __ | 0000000 | ||||||||
| 1/2" | 1" | 3/8" | 7/8" | 32,000 | ASTM A513 Type 1 | __ | 0000000 | ||||||||
| 3/4" | 3/4" | 5/8" | 5/8" | 32,000 | ASTM A513 Type 1 | __ | 0000000 | ||||||||
| 1" | 1" | 7/8" | 7/8" | 32,000 | ASTM A513 Type 1 | __ | 0000000 | ||||||||
| 1" | 2" | 7/8" | 1 7/8" | 32,000 | ASTM A513 Type 1 | __ | 0000000 | ||||||||
| 1 1/4" | 1 1/4" | 1 1/8" | 1 1/8" | 32,000 | ASTM A513 Type 1 | __ | 0000000 | ||||||||
| 1 1/2" | 1 1/2" | 1 3/8" | 1 3/8" | 32,000 | ASTM A513 Type 1 | __ | 0000000 | ||||||||
| 1 3/4" | 1 3/4" | 1 5/8" | 1 5/8" | 32,000 | ASTM A513 Type 1 | __ | 0000000 | ||||||||
| 2" | 2" | 1 7/8" | 1 7/8" | 32,000 | ASTM A513 Type 1 | __ | 0000000 | ||||||||
0.065" Wall Thick. | |||||||||||||||
| 1/2" | 1/2" | 0.37" | 0.37" | 32,000 | ASTM A513 Type 1 | __ | 00000000 | ||||||||
| 1/2" | 1" | 0.37" | 0.87" | Not Rated | ASTM A513 Type 1 | __ | 0000000 | ||||||||
| 1/2" | 1 1/2" | 0.37" | 1.37" | 32,000 | ASTM A513 Type 1 | __ | 0000000 | ||||||||
| 5/8" | 5/8" | 0.495" | 0.495" | Not Rated | ASTM A513 | __ | 0000000 | ||||||||
| 3/4" | 3/4" | 0.62" | 0.62" | 32,000 | ASTM A513 Type 1 | __ | 00000000 | ||||||||
| 3/4" | 1 1/2" | 0.62" | 1.37" | 32,000 | ASTM A513 Type 1 | __ | 0000000 | ||||||||
| 1" | 1" | 0.87" | 0.87" | 32,000 | ASTM A513 Type 1 | 1/16" per 3 ft. | 00000000 | ||||||||
| 1" | 1 1/2" | 0.87" | 1.37" | Not Rated | ASTM A513 Type 1 | __ | 0000000 | ||||||||
| 1" | 2" | 0.87" | 1.87" | Not Rated | ASTM A513 Type 1 | __ | 0000000 | ||||||||
| 1" | 3" | 0.87" | 2.87" | Not Rated | ASTM A513 Type 1 | __ | 0000000 | ||||||||
| 1 1/4" | 1 1/4" | 1.12" | 1.12" | 32,000 | ASTM A513 Type 1 | 1/16" per 3 ft. | 00000000 | ||||||||
| 1 1/2" | 1 1/2" | 1.37" | 1.37" | 32,000 | ASTM A513 Type 1 | 1/16" per 3 ft. | 0000000 | ||||||||
| 2" | 2" | 1.87" | 1.87" | Not Rated | ASTM A513 Type 1 | __ | 0000000 | ||||||||
| 2 1/2" | 2 1/2" | 2.37" | 2.37" | 32,000 | ASTM A513 Type 1 | __ | 0000000 | ||||||||
0.083" Wall Thick. | |||||||||||||||
| 3/4" | 3/4" | 0.584" | 0.584" | 32,000 | ASTM A513 Type 1 | __ | 00000000 | ||||||||
| 3/4" | 1 1/2" | 0.584" | 1.334" | Not Rated | ASTM A513 Type 1 | __ | 000000 | ||||||||
| 1" | 1" | 0.834" | 0.834" | 32,000 | ASTM A513 Type 1 | 1/16" per 3 ft. | 00000000 | ||||||||
| 1" | 1 1/2" | 0.834" | 1.334" | Not Rated | ASTM A513 Type 1 | __ | 0000000 | ||||||||
| 1" | 2" | 0.834" | 1.834" | Not Rated | ASTM A513 Type 1 | __ | 0000000 | ||||||||
| 1" | 3" | 0.834" | 2.834" | Not Rated | ASTM A513 Type 1 | __ | 0000000 | ||||||||
| 1 1/4" | 1 1/4" | 1.084" | 1.084" | Not Rated | ASTM A513 Type 1 | __ | 0000000 | ||||||||
| 1 1/2" | 1 1/2" | 1.334" | 1.334" | 32,000 | ASTM A513 Type 1 | 1/16" per 3 ft. | 00000000 | ||||||||
| 2" | 2" | 1.834" | 1.834" | Not Rated | ASTM A513 Type 1 | __ | 00000000 | ||||||||
| 2" | 4" | 1.834" | 3.834" | Not Rated | ASTM A513 Type 1 | __ | 0000000 | ||||||||
| 2 1/2" | 2 1/2" | 2.334" | 2.334" | Not Rated | ASTM A513 Type 1 | __ | 0000000 | ||||||||
0.12" Wall Thick. | |||||||||||||||
| 3/4" | 3/4" | 0.51" | 0.51" | Not Rated | ASTM A513 Type 1 | __ | 0000000 | ||||||||
| 3/4" | 1 1/2" | 0.51" | 1.26" | 32,000 | ASTM A513 Type 1 | __ | 00000000 | ||||||||
| 1" | 1" | 0.76" | 0.76" | 46,000 | ASTM A500 | 1/16" per 3 ft. | 00000000 | ||||||||
| 1" | 1 1/2" | 0.76" | 1.26" | Not Rated | ASTM A513 Type 1 | __ | 0000000 | ||||||||
| 1" | 2" | 0.76" | 1.76" | Not Rated | ASTM A513 Type 1 | __ | 0000000 | ||||||||
| 1" | 3" | 0.76" | 2.76" | 32,000 | ASTM A513 Type 1 | __ | 0000000 | ||||||||
| 1 1/4" | 1 1/4" | 1.01" | 1.01" | Not Rated | ASTM A513 Type 1 | __ | 0000000 | ||||||||
| 1 1/2" | 1 1/2" | 1.26" | 1.26" | 32,000 | ASTM A513 Type 1 | 1/16" per 3 ft. | 00000000 | ||||||||
| 1 1/2" | 2 1/2" | 1.26" | 2.26" | 32,000 | ASTM A513 Type 1 | 1/16" per 3 ft. | 0000000 | ||||||||
| 1 1/2" | 3" | 1.26" | 2.76" | 32,000 | ASTM A513 Type 1 | __ | 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 | ||||||||
| 2 1/2" | 2 1/2" | 2.26" | 2.26" | 32,000 | ASTM A513 Type 1 | __ | 00000000 | ||||||||
| 3" | 3" | 2.76" | 2.76" | 32,000 | ASTM A513 Type 1 | __ | 00000000 | ||||||||
| 4" | 4" | 3.76" | 3.76" | 39,000 | ASTM A500 | __ | 00000000 | ||||||||
1/8" Wall Thick. | |||||||||||||||
| 3/4" | 1 1/2" | 1/2" | 1 1/4" | 32,000 | ASTM A513 Type 1 | __ | 00000000 | ||||||||
| 1" | 1 1/2" | 3/4" | 1 1/4" | 32,000 | ASTM A513 Type 1 | __ | 00000000 | ||||||||
| 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 1/4" | 1 1/4" | 1" | 1" | 32,000 | ASTM A513 Type 1 | __ | 00000000 | ||||||||
| 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 1/4" | 1 3/4" | 32,000 | ASTM A513 Type 1 | __ | 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 | ||||||||
| 1 3/4" | 1 3/4" | 1 1/2" | 1 1/2" | 32,000 | ASTM A513 Type 1 | __ | 00000000 | ||||||||
| 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 | ||||||||
Metric Tubes
- Yield Strength: 34,000 psi
- Hardness: Rockwell B65 (Medium)
- Heat Treatable: Yes
- Max. Hardness After Heat Treatment: Not Rated
- Fabrication: Welded
- Specifications Met: EN 10305-5
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.
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 | |||||
