# Square and rectangular steel tube sizes by gauge (1x1, 1-1/2, 2x1 in; 16, 14, 11 ga) + ASTM A500 corner radius limit, weight per foot

> What sizes does square steel tube come in (1x1, 1-1/2x1-1/2, 2x2) with 14 gauge, 11 gauge and 1/8 walls, and what is the corner radius?

- Category: Hardware › Framing
- Kind: Standard part
- Basis: Sugar Steel square tubing chart and Continental Steel rectangular tube listings for size, wall and lb/ft; corner-radius limit from the ASTM A500 text as quoted by Industrial Tube and Chicago Tube; numbers only, no file
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**Exact dimensions.** True size, with no printing tolerance added.

## Notes

- Square and rectangular steel tube under about 2 in is mostly sold by gauge and made as mechanical tube: Industrial Tube Corp. says outside dimensions under 2 in with a wall under 0.120 in are typically ASTM A513, and 2 in and larger with 0.120 in and heavier are typically ASTM A500. So '1x1 A500' and '1-1/2 sq A500' are usually A513 in practice; the geometry and the 3t corner limit below are the same ideas either way.
- ASTM A500 corner radius: 'the radius of any outside corner of the section shall not exceed three times the specified wall thickness' (A500 section 10.6, quoted by Industrial Tube, Chicago Tube, Speedy Metals; the Steel Tube Institute article says the same, 3 x t). The wall-thickness tolerance does not apply at corners. There is no nominal radius in A500, so no file is drawn here.
- A500 tolerances (Industrial Tube Corp.): outside dimension +/-0.020 in for the largest side 1 to 2-1/2 in, +/-0.025 in over 2-1/2 to 3-1/2 in, +/-0.030 in over 3-1/2 to 5-1/2 in, +/-1 % above that; wall +/-10 %.
- Sizes at 2 in and up in the AISC HSS database (HSS2x2x1/8 and heavier, with the true AISC walls) are on aisc-hss-rectangular-square with files; this page lists only what that page does not: sizes under 2 in and gauge walls (16, 14, 11 ga) in squares, plus the rectangular gauge sizes from Continental Steel. Weights are as printed by the distributors; they are nominal and different sources allow for the corner radius differently (gauge walls match a sharp-corner estimate to about 1 %; the heavier walls print up to 13% less, which is the corner allowance).
- Gauge walls match what McMaster-Carr lists: its square and rectangular tube pages show wall thicknesses 0.035, 0.049, 1/16, 0.065, 0.083, 0.120, 1/8, 0.188, 1/4, 5/16, 3/8 and 1/2 in, and outside sizes from 3/8 to 8 in. McMaster has the per-part STEP; Xem links it and does not copy it.
- Rectangular sizes 2x3, 2x4, 3x4 and so on are on the AISC page. Cold-formed C and Z purlins are not listed: no public standard table exists (each metal-building maker has its own sizes).

## Sizes

| size (in) | wall name as printed | wall (in) | wall (mm) | outside H (mm) | outside B (mm) | weight (lb/ft) | weight (kg/m) | A500 max outside corner radius 3t (mm) |
|---|---|---|---|---|---|---|---|---|
| 1/2 sq | 18 ga | 0.049 | 1.24 | 12.7 | 12.7 | 0.3005 | 0.447 | 3.73 |
| 1/2 sq | 16 ga | 0.065 | 1.65 | 12.7 | 12.7 | 0.3845 | 0.572 | 4.95 |
| 3/4 sq | 18 ga | 0.049 | 1.24 | 19.0 | 19.0 | 0.4671 | 0.695 | 3.73 |
| 3/4 sq | 16 ga | 0.065 | 1.65 | 19.0 | 19.0 | 0.6055 | 0.901 | 4.95 |
| 3/4 sq | 14 ga | 0.083 | 2.11 | 19.0 | 19.0 | 0.7528 | 1.12 | 6.32 |
| 3/4 sq | 11 ga | 0.12 | 3.05 | 19.0 | 19.0 | 1.028 | 1.53 | 9.14 |
| 1 sq | 16 ga | 0.065 | 1.65 | 25.4 | 25.4 | 0.826 | 1.229 | 4.95 |
| 1 sq | 14 ga | 0.083 | 2.11 | 25.4 | 25.4 | 1.035 | 1.54 | 6.32 |
| 1 sq | 11 ga | 0.12 | 3.05 | 25.4 | 25.4 | 1.44 | 2.143 | 9.14 |
| 1-1/4 sq | 16 ga | 0.065 | 1.65 | 31.8 | 31.8 | 1.048 | 1.56 | 4.95 |
| 1-1/4 sq | 14 ga | 0.083 | 2.11 | 31.8 | 31.8 | 1.317 | 1.96 | 6.32 |
| 1-1/4 sq | 11 ga | 0.12 | 3.05 | 31.8 | 31.8 | 1.844 | 2.744 | 9.14 |
| 1-1/4 sq | 3/16 | 0.188 | 4.78 | 31.8 | 31.8 | 2.4 | 3.572 | 14.33 |
| 1-1/2 sq | 16 ga | 0.065 | 1.65 | 38.1 | 38.1 | 1.269 | 1.888 | 4.95 |
| 1-1/2 sq | 14 ga | 0.083 | 2.11 | 38.1 | 38.1 | 1.6 | 2.381 | 6.32 |
| 1-1/2 sq | 11 ga | 0.12 | 3.05 | 38.1 | 38.1 | 2.252 | 3.351 | 9.14 |
| 1-1/2 sq | 3/16 | 0.188 | 4.78 | 38.1 | 38.1 | 3.04 | 4.524 | 14.33 |
| 1-1/2 sq | 1/4 | 0.25 | 6.35 | 38.1 | 38.1 | 3.7 | 5.506 | 19.05 |
| 1-3/4 sq | 16 ga | 0.065 | 1.65 | 44.4 | 44.4 | 1.49 | 2.217 | 4.95 |
| 1-3/4 sq | 14 ga | 0.083 | 2.11 | 44.4 | 44.4 | 1.882 | 2.801 | 6.32 |
| 1-3/4 sq | 11 ga | 0.12 | 3.05 | 44.4 | 44.4 | 2.66 | 3.959 | 9.14 |
| 1-3/4 sq | 3/16 | 0.188 | 4.78 | 44.4 | 44.4 | 3.994 | 5.944 | 14.33 |
| 2 sq | 16 ga | 0.065 | 1.65 | 50.8 | 50.8 | 1.711 | 2.546 | 4.95 |
| 2 sq | 14 ga | 0.083 | 2.11 | 50.8 | 50.8 | 2.164 | 3.22 | 6.32 |
| 2 sq | 11 ga | 0.12 | 3.05 | 50.8 | 50.8 | 3.07 | 4.569 | 9.14 |
| 2-1/4 sq | 14 ga | 0.083 | 2.11 | 57.1 | 57.1 | 2.446 | 3.64 | 6.32 |
| 2-1/4 sq | 11 ga | 0.12 | 3.05 | 57.1 | 57.1 | 3.48 | 5.179 | 9.14 |
| 2-1/2 sq | 14 ga | 0.083 | 2.11 | 63.5 | 63.5 | 2.728 | 4.06 | 6.32 |
| 2-1/2 sq | 11 ga | 0.12 | 3.05 | 63.5 | 63.5 | 3.9 | 5.804 | 9.14 |
| 3 sq | 14 ga | 0.083 | 2.11 | 76.2 | 76.2 | 3.293 | 4.901 | 6.32 |
| 3 sq | 11 ga | 0.12 | 3.05 | 76.2 | 76.2 | 4.75 | 7.069 | 9.14 |
| 3-1/2 sq | 11 ga | 0.12 | 3.05 | 88.9 | 88.9 | 5.61 | 8.349 | 9.14 |
| 4 sq | 11 ga | 0.12 | 3.05 | 101.6 | 101.6 | 6.46 | 9.614 | 9.14 |
| 1-1/2 x 1 | 14 gauge | 0.083 | 2.11 | 38.1 | 25.4 | 1.288 | 1.917 | 6.32 |
| 1-1/2 x 1 | 11 gauge | 0.12 | 3.05 | 38.1 | 25.4 | 1.766 | 2.628 | 9.14 |
| 2 x 1 | 14 gauge | 0.083 | 2.11 | 50.8 | 25.4 | 1.59 | 2.366 | 6.32 |
| 2 x 1-1/4 | 14 gauge | 0.083 | 2.11 | 50.8 | 31.8 | 1.711 | 2.546 | 6.32 |
| 2 x 1-1/2 | 11 gauge | 0.12 | 3.05 | 50.8 | 38.1 | 2.582 | 3.842 | 9.14 |

## Where the files are

- Sugar Steel: [Square tubing chart: nominal size, weight per foot, wall thickness (1/2 x 1/2 to 16 x 16)](https://sugarsteel.com/wp-content/uploads/SquareTubingFull.pdf) — web — Publisher's page; dimensions are facts
- Continental Steel & Tube: [Rectangular structural tubing, carbon steel: 1-1/2 x 1 to 2 x 1-1/2, 14 and 11 gauge, lb/ft](https://continentalsteel.com/compare/pipe-and-tubing/rectangular-structural-tubing-carbon-steel) — web — Publisher's page; dimensions are facts
- Industrial Tube Corporation: [ASTM A500 square and rectangular tube: outside corner radius not over 3 x wall; outside-dimension and wall tolerances](https://www.industrialtube.com/tolerances/) — web — Publisher's page; dimensions are facts
- Industrial Tube Corporation: [Rectangular structural tubing: under 2 in OD with wall under 0.120 in is typically ASTM A513; 2 in and up with 0.120 in and heavier is typically ASTM A500](https://www.industrialtube.com/rectangular-structural-tubing/) — web — Publisher's page; dimensions are facts
- Chicago Tube & Iron: [ASTM A500 section 10.6: outside corner radius not over three times the specified wall; wall tolerance does not apply at corners](https://www.chicagotube.com/products-2/square-rectangular-round-tubing/astm-a-500) — web — Publisher's page; dimensions are facts
- Steel Tube Institute: [HSS article: the maximum corner radius for rectangular and square shapes is 3t; 10 % thickness tolerance](https://steeltubeinstitute.org/wp-content/uploads/2022/08/HSS_Article_ASTM-080722.pdf) — web — Publisher's page; dimensions are facts
- McMaster-Carr: [Square hollow sections / square and rectangular tube, steel (free STEP/IGES per part, for your own design use; no redistribution)](https://www.mcmaster.com/products/square-hollow-sections) — STEP, IGES, PDF — McMaster-Carr site terms: personal design use, no redistribution (verify at link)
- McMaster-Carr: [Low-carbon steel rectangular tubes (ASTM A513 / A500; metric EN 10305-5) (free STEP/IGES per part, for your own design use; no redistribution)](https://www.mcmaster.com/products/low-carbon-steel-rectangular-tubes) — STEP, IGES, PDF — McMaster-Carr site terms: personal design use, no redistribution (verify at link)

## Questions

**What is the corner radius of A500 square tube?**

A500 only sets a cap: the outside corner radius may not exceed 3 x the wall. There is no nominal radius; AISC section tables use 2 x the design wall.

**Is 1x1 square tube A500?**

Usually A513. Industrial Tube says tube under 2 in with a wall under 0.120 in is typically A513; A500 is typical from 2 in with 0.120 in and heavier walls.

**How much does 1x1x14 gauge square tube weigh?**

1.035 lb/ft (0.083 in wall) per the Sugar Steel chart.

**Do you have C and Z purlin sizes?**

No. Cold-formed C and Z purlins have no public standard table (each metal-building maker has its own); nothing is published rather than guessed.

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