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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? · 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
Also called: square tube, square tubing, square steel tube sizes, steel square tubing dimensions, 1x1 square tube, 1x1 steel tube, 1x1x1/8 square tube, 1x1 14 gauge square tube, 1 inch square tube wall thickness, 1-1/2 square tube, 1.5 square tubing, 1 1/2 x 1 1/2 square tube, 2x2 square tube 11 gauge, 2x2x1/8 square tube, 2x1 rectangular tube, 1x2 steel tube, 2x3 rectangular tube, 2x4 rectangular tube, 3x3 sq
Exact dimensions. True size, with no printing tolerance added.
- sizes
- 38 in table
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).
Square and rectangular steel tube sizes by gauge (1x1, 1-1/2, 2x1… size chart
| 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
Other publishers' files are linked, not hosted. "verify" = check the license at the link before commercial use.
Xem scan
File coming
No downloadable true-size file yet: the published figures do not fix the whole shape, and Xem never guesses a number. A measured scan is planned; request it and it moves up.
https://xemstudio.com/mcp to Claude, ChatGPT, Cursor or any MCP client (free, no account, one minute) and it can look up exact sizes, mating fits and free STEP/STL from every chat.Plain text: sheet.txt · JSON: /api/geometry?object=steel-square-rectangular-tube-gauge-sizes
Fits with
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.