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Square Spec Table
Square Specifications — 195 sizes
KS D 3568JIS G 3466ASTM A500
Square-section hollow tubes used for columns, frames, and support structures.
Practical Notes
- For columns, legs, and supports needing equal strength on all 4 faces. Resists torsion evenly.
- Watch for weld distortion from residual stress. Alternate-side welding minimizes deformation.
Selection Guide
For columns, legs, and supports needing equal strength on all 4 faces. Easy right-angle welding, even torsion resistance. General frames: t2.3–3.2mm; heavy duty: t4.5–6.0mm.
KSSquare
59 sizes| Nominal | Width | Height | t | Weight | Material |
|---|---|---|---|---|---|
| □20×20 | 20 | 20 | 1.2 | 0.679 | SRT275 |
| □20×20 | 20 | 20 | 1.6 | 0.873 | SRT275 |
| □25×25 | 25 | 25 | 1.2 | 0.868 | SRT275 |
| □25×25 | 25 | 25 | 1.6 | 1.12 | SRT275 |
| □30×30 | 30 | 30 | 1.2 | 1.06 | SRT275 |
| □30×30 | 30 | 30 | 1.6 | 1.38 | SRT275 |
| □40×40 | 40 | 40 | 1.6 | 1.88 | SRT275 |
| □40×40 | 40 | 40 | 2.3 | 2.62 | SRT275 |
| □50×50 | 50 | 50 | 1.6 | 2.38 | SRT275 |
| □50×50 | 50 | 50 | 2.3 | 3.34 | SRT275 |
| □50×50 | 50 | 50 | 3.2 | 4.5 | SRT275 |
| □60×60 | 60 | 60 | 1.6 | 2.88 | SRT275 |
| □60×60 | 60 | 60 | 2.3 | 4.06 | SRT275 |
| □60×60 | 60 | 60 | 3.2 | 5.5 | SRT275 |
| □75×75 | 75 | 75 | 1.6 | 3.64 | SRT275 |
| □75×75 | 75 | 75 | 2.3 | 5.14 | SRT275 |
| □75×75 | 75 | 75 | 3.2 | 7.01 | SRT275 |
| □75×75 | 75 | 75 | 4.5 | 9.55 | SRT275 |
| □80×80 | 80 | 80 | 2.3 | 5.5 | SRT275 |
| □80×80 | 80 | 80 | 3.2 | 7.51 | SRT275 |
| □80×80 | 80 | 80 | 4.5 | 10.3 | SRT275 |
| □90×90 | 90 | 90 | 2.3 | 6.23 | SRT275 |
| □90×90 | 90 | 90 | 3.2 | 8.51 | SRT275 |
| □100×100 | 100 | 100 | 2.3 | 6.95 | SRT275 |
| □100×100 | 100 | 100 | 3.2 | 9.52 | SRT275 |
| □100×100 | 100 | 100 | 4 | 11.7 | SRT275 |
| □100×100 | 100 | 100 | 4.5 | 13.1 | SRT275 |
| □100×100 | 100 | 100 | 6 | 17 | SRT275 |
| □100×100 | 100 | 100 | 9 | 24.1 | SRT275 |
| □100×100 | 100 | 100 | 12 | 30.2 | SRT275 |
| □125×125 | 125 | 125 | 3.2 | 12 | SRT275 |
| □125×125 | 125 | 125 | 4.5 | 16.6 | SRT275 |
| □125×125 | 125 | 125 | 5 | 18.3 | SRT275 |
| □125×125 | 125 | 125 | 6 | 21.7 | SRT275 |
| □125×125 | 125 | 125 | 9 | 31.1 | SRT275 |
| □125×125 | 125 | 125 | 12 | 39.7 | SRT275 |
| □150×150 | 150 | 150 | 4.5 | 20.1 | SRT275 |
| □150×150 | 150 | 150 | 5 | 22.3 | SRT275 |
| □150×150 | 150 | 150 | 6 | 26.4 | SRT275 |
| □150×150 | 150 | 150 | 9 | 38.2 | SRT275 |
| □175×175 | 175 | 175 | 4.5 | 23.7 | SRT275 |
| □175×175 | 175 | 175 | 5 | 26.2 | SRT275 |
| □175×175 | 175 | 175 | 6 | 31.1 | SRT275 |
| □200×200 | 200 | 200 | 4.5 | 27.2 | SRT275 |
| □200×200 | 200 | 200 | 6 | 35.8 | SRT275 |
| □200×200 | 200 | 200 | 8 | 46.9 | SRT275 |
| □200×200 | 200 | 200 | 9 | 52.3 | SRT275 |
| □200×200 | 200 | 200 | 12 | 67.9 | SRT275 |
| □250×250 | 250 | 250 | 5 | 38 | SRT275 |
| □250×250 | 250 | 250 | 6 | 45.2 | SRT275 |
| □250×250 | 250 | 250 | 8 | 59.5 | SRT275 |
| □250×250 | 250 | 250 | 9 | 66.5 | SRT275 |
| □250×250 | 250 | 250 | 12 | 86.8 | SRT275 |
| □300×300 | 300 | 300 | 4.5 | 41.3 | SRT275 |
| □300×300 | 300 | 300 | 6 | 54.7 | SRT275 |
| □300×300 | 300 | 300 | 9 | 80.6 | SRT275 |
| □300×300 | 300 | 300 | 12 | 106 | SRT275 |
| □350×350 | 350 | 350 | 9 | 94.7 | SRT275 |
| □350×350 | 350 | 350 | 12 | 124 | SRT275 |
JISSquare
59 sizes| Nominal | Width | Height | t | Weight | Material |
|---|---|---|---|---|---|
| □20×20 | 20 | 20 | 1.2 | 0.679 | STKR400 |
| □20×20 | 20 | 20 | 1.6 | 0.873 | STKR400 |
| □25×25 | 25 | 25 | 1.2 | 0.868 | STKR400 |
| □25×25 | 25 | 25 | 1.6 | 1.12 | STKR400 |
| □30×30 | 30 | 30 | 1.2 | 1.06 | STKR400 |
| □30×30 | 30 | 30 | 1.6 | 1.38 | STKR400 |
| □40×40 | 40 | 40 | 1.6 | 1.88 | STKR400 |
| □40×40 | 40 | 40 | 2.3 | 2.62 | STKR400 |
| □50×50 | 50 | 50 | 1.6 | 2.38 | STKR400 |
| □50×50 | 50 | 50 | 2.3 | 3.34 | STKR400 |
| □50×50 | 50 | 50 | 3.2 | 4.5 | STKR400 |
| □60×60 | 60 | 60 | 1.6 | 2.88 | STKR400 |
| □60×60 | 60 | 60 | 2.3 | 4.06 | STKR400 |
| □60×60 | 60 | 60 | 3.2 | 5.5 | STKR400 |
| □75×75 | 75 | 75 | 1.6 | 3.64 | STKR400 |
| □75×75 | 75 | 75 | 2.3 | 5.14 | STKR400 |
| □75×75 | 75 | 75 | 3.2 | 7.01 | STKR400 |
| □75×75 | 75 | 75 | 4.5 | 9.55 | STKR400 |
| □80×80 | 80 | 80 | 2.3 | 5.5 | STKR400 |
| □80×80 | 80 | 80 | 3.2 | 7.51 | STKR400 |
| □80×80 | 80 | 80 | 4.5 | 10.3 | STKR400 |
| □90×90 | 90 | 90 | 2.3 | 6.23 | STKR400 |
| □90×90 | 90 | 90 | 3.2 | 8.51 | STKR400 |
| □100×100 | 100 | 100 | 2.3 | 6.95 | STKR400 |
| □100×100 | 100 | 100 | 3.2 | 9.52 | STKR400 |
| □100×100 | 100 | 100 | 4 | 11.7 | STKR400 |
| □100×100 | 100 | 100 | 4.5 | 13.1 | STKR400 |
| □100×100 | 100 | 100 | 6 | 17 | STKR400 |
| □100×100 | 100 | 100 | 9 | 24.1 | STKR400 |
| □100×100 | 100 | 100 | 12 | 30.2 | STKR400 |
| □125×125 | 125 | 125 | 3.2 | 12 | STKR400 |
| □125×125 | 125 | 125 | 4.5 | 16.6 | STKR400 |
| □125×125 | 125 | 125 | 5 | 18.3 | STKR400 |
| □125×125 | 125 | 125 | 6 | 21.7 | STKR400 |
| □125×125 | 125 | 125 | 9 | 31.1 | STKR400 |
| □125×125 | 125 | 125 | 12 | 39.7 | STKR400 |
| □150×150 | 150 | 150 | 4.5 | 20.1 | STKR400 |
| □150×150 | 150 | 150 | 5 | 22.3 | STKR400 |
| □150×150 | 150 | 150 | 6 | 26.4 | STKR400 |
| □150×150 | 150 | 150 | 9 | 38.2 | STKR400 |
| □175×175 | 175 | 175 | 4.5 | 23.7 | STKR400 |
| □175×175 | 175 | 175 | 5 | 26.2 | STKR400 |
| □175×175 | 175 | 175 | 6 | 31.1 | STKR400 |
| □200×200 | 200 | 200 | 4.5 | 27.2 | STKR400 |
| □200×200 | 200 | 200 | 6 | 35.8 | STKR400 |
| □200×200 | 200 | 200 | 8 | 46.9 | STKR400 |
| □200×200 | 200 | 200 | 9 | 52.3 | STKR400 |
| □200×200 | 200 | 200 | 12 | 67.9 | STKR400 |
| □250×250 | 250 | 250 | 5 | 38 | STKR400 |
| □250×250 | 250 | 250 | 6 | 45.2 | STKR400 |
| □250×250 | 250 | 250 | 8 | 59.5 | STKR400 |
| □250×250 | 250 | 250 | 9 | 66.5 | STKR400 |
| □250×250 | 250 | 250 | 12 | 86.8 | STKR400 |
| □300×300 | 300 | 300 | 4.5 | 41.3 | STKR400 |
| □300×300 | 300 | 300 | 6 | 54.7 | STKR400 |
| □300×300 | 300 | 300 | 9 | 80.6 | STKR400 |
| □300×300 | 300 | 300 | 12 | 106 | STKR400 |
| □350×350 | 350 | 350 | 9 | 94.7 | STKR400 |
| □350×350 | 350 | 350 | 12 | 124 | STKR400 |
ASTMSquare
77 sizes| Nominal | Width | Height | t | Weight | Material |
|---|---|---|---|---|---|
| HSS 1×1×1/8 | 25.4 | 25.4 | 3.18 | 2.01 | A500 Gr.B |
| HSS 1.25×1.25×1/8 | 31.8 | 31.8 | 3.18 | 2.65 | A500 Gr.B |
| HSS 1.25×1.25×3/16 | 31.8 | 31.8 | 4.78 | 3.59 | A500 Gr.B |
| HSS 1.5×1.5×1/8 | 38.1 | 38.1 | 3.18 | 3.28 | A500 Gr.B |
| HSS 1.5×1.5×3/16 | 38.1 | 38.1 | 4.78 | 4.54 | A500 Gr.B |
| HSS 1.5×1.5×1/4 | 38.1 | 38.1 | 6.35 | 5.52 | A500 Gr.B |
| HSS 2×2×1/8 | 50.8 | 50.8 | 3.18 | 4.55 | A500 Gr.B |
| HSS 2×2×3/16 | 50.8 | 50.8 | 4.78 | 6.45 | A500 Gr.B |
| HSS 2×2×1/4 | 50.8 | 50.8 | 6.35 | 8.05 | A500 Gr.B |
| HSS 2.5×2.5×1/8 | 63.5 | 63.5 | 3.18 | 5.82 | A500 Gr.B |
| HSS 2.5×2.5×3/16 | 63.5 | 63.5 | 4.78 | 8.35 | A500 Gr.B |
| HSS 2.5×2.5×1/4 | 63.5 | 63.5 | 6.35 | 10.6 | A500 Gr.B |
| HSS 3×3×1/8 | 76.2 | 76.2 | 3.18 | 7.09 | A500 Gr.B |
| HSS 3×3×3/16 | 76.2 | 76.2 | 4.78 | 10.3 | A500 Gr.B |
| HSS 3×3×1/4 | 76.2 | 76.2 | 6.35 | 13.1 | A500 Gr.B |
| HSS 3×3×5/16 | 76.2 | 76.2 | 7.95 | 15.8 | A500 Gr.B |
| HSS 3×3×3/8 | 76.2 | 76.2 | 9.52 | 18.1 | A500 Gr.B |
| HSS 3.5×3.5×1/8 | 88.9 | 88.9 | 3.18 | 8.35 | A500 Gr.B |
| HSS 3.5×3.5×3/16 | 88.9 | 88.9 | 4.78 | 12.2 | A500 Gr.B |
| HSS 3.5×3.5×1/4 | 88.9 | 88.9 | 6.35 | 15.6 | A500 Gr.B |
| HSS 3.5×3.5×5/16 | 88.9 | 88.9 | 7.95 | 18.9 | A500 Gr.B |
| HSS 3.5×3.5×3/8 | 88.9 | 88.9 | 9.52 | 21.9 | A500 Gr.B |
| HSS 4×4×1/8 | 101.6 | 101.6 | 3.18 | 9.62 | A500 Gr.B |
| HSS 4×4×3/16 | 101.6 | 101.6 | 4.78 | 14.1 | A500 Gr.B |
| HSS 4×4×1/4 | 101.6 | 101.6 | 6.35 | 18.2 | A500 Gr.B |
| HSS 4×4×5/16 | 101.6 | 101.6 | 7.95 | 22.1 | A500 Gr.B |
| HSS 4×4×3/8 | 101.6 | 101.6 | 9.52 | 25.7 | A500 Gr.B |
| HSS 4×4×1/2 | 101.6 | 101.6 | 12.7 | 32.2 | A500 Gr.B |
| HSS 4.5×4.5×1/8 | 114.3 | 114.3 | 3.18 | 10.9 | A500 Gr.B |
| HSS 4.5×4.5×3/16 | 114.3 | 114.3 | 4.78 | 16 | A500 Gr.B |
| HSS 4.5×4.5×1/4 | 114.3 | 114.3 | 6.35 | 20.7 | A500 Gr.B |
| HSS 4.5×4.5×5/16 | 114.3 | 114.3 | 7.95 | 25.3 | A500 Gr.B |
| HSS 4.5×4.5×3/8 | 114.3 | 114.3 | 9.52 | 29.5 | A500 Gr.B |
| HSS 4.5×4.5×1/2 | 114.3 | 114.3 | 12.7 | 37.3 | A500 Gr.B |
| HSS 5×5×1/8 | 127 | 127 | 3.18 | 12.2 | A500 Gr.B |
| HSS 5×5×3/16 | 127 | 127 | 4.78 | 17.9 | A500 Gr.B |
| HSS 5×5×1/4 | 127 | 127 | 6.35 | 23.2 | A500 Gr.B |
| HSS 5×5×5/16 | 127 | 127 | 7.95 | 28.4 | A500 Gr.B |
| HSS 5×5×3/8 | 127 | 127 | 9.52 | 33.3 | A500 Gr.B |
| HSS 5×5×1/2 | 127 | 127 | 12.7 | 42.3 | A500 Gr.B |
| HSS 6×6×3/16 | 152.4 | 152.4 | 4.78 | 21.7 | A500 Gr.B |
| HSS 6×6×1/4 | 152.4 | 152.4 | 6.35 | 28.3 | A500 Gr.B |
| HSS 6×6×5/16 | 152.4 | 152.4 | 7.95 | 34.8 | A500 Gr.B |
| HSS 6×6×3/8 | 152.4 | 152.4 | 9.52 | 40.9 | A500 Gr.B |
| HSS 6×6×1/2 | 152.4 | 152.4 | 12.7 | 52.5 | A500 Gr.B |
| HSS 6×6×5/8 | 152.4 | 152.4 | 15.88 | 63 | A500 Gr.B |
| HSS 7×7×3/16 | 177.8 | 177.8 | 4.78 | 25.5 | A500 Gr.B |
| HSS 7×7×1/4 | 177.8 | 177.8 | 6.35 | 33.4 | A500 Gr.B |
| HSS 7×7×5/16 | 177.8 | 177.8 | 7.95 | 41.1 | A500 Gr.B |
| HSS 7×7×3/8 | 177.8 | 177.8 | 9.52 | 48.5 | A500 Gr.B |
| HSS 7×7×1/2 | 177.8 | 177.8 | 12.7 | 62.6 | A500 Gr.B |
| HSS 7×7×5/8 | 177.8 | 177.8 | 15.88 | 75.6 | A500 Gr.B |
| HSS 8×8×3/16 | 203.2 | 203.2 | 4.78 | 29.3 | A500 Gr.B |
| HSS 8×8×1/4 | 203.2 | 203.2 | 6.35 | 38.4 | A500 Gr.B |
| HSS 8×8×5/16 | 203.2 | 203.2 | 7.95 | 47.5 | A500 Gr.B |
| HSS 8×8×3/8 | 203.2 | 203.2 | 9.52 | 56.1 | A500 Gr.B |
| HSS 8×8×1/2 | 203.2 | 203.2 | 12.7 | 72.7 | A500 Gr.B |
| HSS 8×8×5/8 | 203.2 | 203.2 | 15.88 | 88.3 | A500 Gr.B |
| HSS 9×9×3/16 | 228.6 | 228.6 | 4.78 | 33.1 | A500 Gr.B |
| HSS 9×9×1/4 | 228.6 | 228.6 | 6.35 | 43.5 | A500 Gr.B |
| HSS 9×9×5/16 | 228.6 | 228.6 | 7.95 | 53.8 | A500 Gr.B |
| HSS 9×9×3/8 | 228.6 | 228.6 | 9.52 | 63.7 | A500 Gr.B |
| HSS 9×9×1/2 | 228.6 | 228.6 | 12.7 | 82.8 | A500 Gr.B |
| HSS 9×9×5/8 | 228.6 | 228.6 | 15.88 | 101 | A500 Gr.B |
| HSS 10×10×3/16 | 254 | 254 | 4.78 | 36.9 | A500 Gr.B |
| HSS 10×10×1/4 | 254 | 254 | 6.35 | 48.6 | A500 Gr.B |
| HSS 10×10×5/16 | 254 | 254 | 7.95 | 60.1 | A500 Gr.B |
| HSS 10×10×3/8 | 254 | 254 | 9.52 | 71.3 | A500 Gr.B |
| HSS 10×10×1/2 | 254 | 254 | 12.7 | 93 | A500 Gr.B |
| HSS 10×10×5/8 | 254 | 254 | 15.88 | 114 | A500 Gr.B |
| HSS 10×10×3/4 | 254 | 254 | 19.05 | 133 | A500 Gr.B |
| HSS 12×12×1/4 | 304.8 | 304.8 | 6.35 | 58.7 | A500 Gr.B |
| HSS 12×12×5/16 | 304.8 | 304.8 | 7.95 | 72.8 | A500 Gr.B |
| HSS 12×12×3/8 | 304.8 | 304.8 | 9.52 | 86.4 | A500 Gr.B |
| HSS 12×12×1/2 | 304.8 | 304.8 | 12.7 | 113 | A500 Gr.B |
| HSS 12×12×5/8 | 304.8 | 304.8 | 15.88 | 139 | A500 Gr.B |
| HSS 12×12×3/4 | 304.8 | 304.8 | 19.05 | 164 | A500 Gr.B |
Key Features
- KS D 3568 (SPSR); side length range □12–□400 mm
- Equal section modulus on all 4 faces resists multi-axis loads and torsion evenly
- Easy right-angle butt welding; cut face directly serves as joint surface
Key Applications
Building columns/posts, machine frames, guardrails, sign posts, furniture structures
STEP File Downloads
Free 3D CAD models (STEP AP214). Built to real standard dimensions; threads are simplified (plain shank) per free-library convention.
DownloadSQ-20x20x1.2.step
All sizes · CAD guide →FAQ
How to select square tube wall thickness?
General frames: t2.3–3.2mm; heavy duty: t4.5–6.0mm. Proper approach is structural calculation for required cross-sectional area and section modulus.