This specification covers round, square, rectangular, and special shape, electric-resistance-welded mechanical tubing, either zinc-coated (galvanized) after welding or produced from aluminum-coated, zinc-coated (galvanized), zinc-iron alloycoated (galvannealed), or 55 % aluminum-zinc alloy-coated steel sheet. Tubing for use as electrical conduit (EMT) or intermediate metallic conduit (IMC) is not covered by this specification. 1.2 This specification covers mechanical tubing with outside diameters or maximum outside dimensions ranging from 1⁄2 to 15 in. [12.7 to 380.0 mm] and
| Material | Grades |
|---|---|
| Standard Low-Carbon Steels | MT 1010 |
| MT 1015 | |
| MT X 1015 | |
| MT 1020 | |
| MT X 1020 | |
| Other Carbon and Alloy Steels | 1008 |
| 1010 | |
| 1015 | |
| 1016 | |
| 1017 | |
| 1018 | |
| 1019 | |
| 1021 |