ERW carbon steel mechanical tubing — Type 1 (A.W.H.R.) and Type 2 (A.W.C.R.) — in round, square, and rectangular shapes. Grades 1008 through 1020, manufactured to ASTM A513-24.
A513 is what most engineers call out when they need general-purpose carbon steel tubing — automotive components, agricultural equipment, material handling, fitness equipment, conveyors, OEM frames, and anywhere a structural-grade A500 isn't required. The grade you specify (1008 through 1020) controls chemistry; the type (1 or 2) controls input strip and surface finish.
Formed from hot-rolled coil, then welded. Heavier wall capability, our broadest gage range, and lower cost. Specify Type 1 when the application doesn't require a polished finish or tighter ID/OD control.
Same ERW process, cold-rolled input strip. Smoother surface, tighter dimensional control, finer finish. Specify Type 2 when the tube will be machined, plated, painted, or visible.
| Grade | Carbon | Manganese | Phosphorus, max | Sulfur, max |
|---|---|---|---|---|
| 1008 | 0.10 max | 0.50 max | 0.035 | 0.035 |
| 1010 | 0.08 – 0.13 | 0.30 – 0.60 | 0.035 | 0.035 |
| 1015 | 0.13 – 0.18 | 0.30 – 0.60 | 0.035 | 0.035 |
| 1020 | 0.18 – 0.23 | 0.30 – 0.60 | 0.035 | 0.035 |
Per ASTM A513 Table 1. Other carbon and alloy grades (1016–1021, MTX series) available on request per Table 2.
All tolerances pulled directly from ASTM A513-24 and filtered to the size ranges Major Metals produces.
| OD Range | Type 1 (A.W.H.R.) ± | Type 2 (A.W.C.R.) ± |
|---|---|---|
| 1″ to 2″, incl. | 0.005″ | 0.005″ |
| Over 2″ to 2½″, incl. | 0.006″ | 0.006″ |
| Over 2½″ to 3″, incl. | 0.008″ | 0.008″ |
| Over 3″ to 3½″, incl. | 0.009″ | 0.009″ |
Per ASTM A513 Table 4 (Type 1) and Table 10 (Type 2). Measurements taken at least 2″ from the cut end.
| Largest Outside Dimension | Tolerance at Corners ± | Convexity / Concavity ± |
|---|---|---|
| ⅝″ to 1⅛″, incl. | 0.005″ | 0.010″ |
| Over 1⅛″ to 1½″, incl. | 0.006″ | 0.010″ |
| Over 1½″ to 2″, incl. | 0.008″ | 0.010″ |
| Over 2″ to 3″, incl. | 0.010″ | 0.010″ |
| Over 3″ to 4″, incl. | 0.020″ | 0.015″ |
| Over 4″ to 6″, incl. | 0.020″ | 0.025″ |
Per ASTM A513 Table 16. Wall thickness tolerance is ±10% of nominal (Section 10.1).
Cold-formed structural HSS. Grade B and Grade C. The bridge-and-building spec.
Metallic-coated mechanical tubing. Galvanized, galvannealed, or aluminized.
Cold-formed structural tubing from precoated sheet. Galvanized inside and out.
Send your grade, type, size, and length — we'll get a quote back fast.
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