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Eastern Steel Manufacturing Co.,Ltd is a leading manufacturer and distributor of seamless steel pipe, welded steel pipe, OCTG products and fittings. We supply first-step processing, semi-finished parts and finished parts to help our clients meet fabrication requirements beyond their capacity or to improve operations by moving forward the pre-production processing.
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Eastern Steel Manufacturing Co.,Ltd not only improve product production and sales services, but also provide additional value-added services. As long as you need, we can complete your specific needs together.
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Many years of large-scale project experience in various fields（Oil & Gas, Construction, Power Energy, Marine & Offshore, Water Treatment, Exploration & Drilling Services, Pipeline & Petrochemical etc.）, professional project team is responsible from receiving until the end of the project.
Square tube sizes are specified by outside dimensions, wall thickness, and length. Standard square hollow sections (SHS) are available in metric and imperial sizes to meet structural, mechanical, and fabrication requirements. The information below covers the standard square tube dimensions, weights, tolerances, and international standards most commonly used in structural and fabrication projects.
Square tubes are specified by outside dimensions (A × A) and wall thickness, rather than by Schedule numbers used for round steel pipe. Depending on the manufacturing standard, dimensions are expressed in either imperial (inch) or metric (mm) units.
The following tables summarize the most commonly available square tube sizes used in structural, mechanical, and fabrication applications.
| Size Class | Outside Dimension (in) | Wall Thickness (in) | Nominal Weight (lbs/ft) | Standard Length (ft) |
|---|---|---|---|---|
| Small Sizes | 1" × 1" |
0.065 (16 ga) 0.120 (11 ga) |
0.81 1.36 |
20 / 24 |
| 1-1/2" × 1-1/2" |
0.065 (16 ga) 0.120 (11 ga) 0.188 (3/16") |
1.26 2.17 3.05 |
20 / 24 | |
| 2" × 2" |
0.065 (16 ga) 0.120 (11 ga) 0.188 (3/16") 0.250 (1/4") |
1.70 2.99 4.32 5.41 |
20 / 24 / 40 | |
| Medium Sizes | 3" × 3" |
0.120 (11 ga) 0.188 (3/16") 0.250 (1/4") 0.375 (3/8") |
4.62 6.87 8.81 12.16 |
20 / 24 / 40 |
| 4" × 4" |
0.128 (1/8") 0.188 (3/16") 0.250 (1/4") 0.375 (3/8") 0.500 (1/2") |
6.46 9.42 12.21 17.27 21.63 |
20 / 24 / 40 / 48 | |
| 6" × 6" |
0.188 (3/16") 0.250 (1/4") 0.375 (3/8") 0.500 (1/2") |
14.53 19.02 27.48 35.24 |
20 / 24 / 40 / 48 | |
| Large Sizes | 8" × 8" |
0.250 (1/4") 0.375 (3/8") 0.500 (1/2") |
25.82 37.69 48.85 |
20 to 48 |
| 10" × 10" |
0.250 (1/4") 0.375 (3/8") 0.500 (1/2") |
32.63 47.90 62.46 |
20 to 48 | |
| 12" × 12" |
0.250 (1/4") 0.375 (3/8") 0.500 (1/2") 0.625 (5/8") |
39.43 58.10 76.07 93.34 |
20 to 48 | |
| Jumbo Sizes | 16" × 16" |
0.375 (3/8") 0.500 (1/2") 0.625 (5/8") |
78.52 103.30 127.36 |
Up to 60 |
| 22" × 22" |
0.500 (1/2") 0.750 (3/4") 1.000 (1") |
144.15 211.30 276.00 |
Up to 60 |
| Size Class | Outside Dimension (mm) | Wall Thickness (mm) | Nominal Weight (kg/m) | Standard Length (m) |
|---|---|---|---|---|
| Small Sizes | 20 × 20 |
1.6 2.0 |
0.89 1.07 |
6 |
| 40 × 40 |
1.6 2.0 3.0 |
1.94 2.41 3.47 |
6 / 8 | |
| 50 × 50 |
2.0 3.0 4.0 |
2.93 4.25 5.45 |
6 / 8 | |
| Medium Sizes | 75 × 75 |
3.0 4.0 5.0 6.0 |
6.64 8.62 10.51 12.36 |
6 / 8 / 12 |
| 100 × 100 |
3.0 4.0 5.0 6.0 8.0 |
8.96 11.72 14.41 17.04 22.06 |
6 / 8 / 12 | |
| 150 × 150 |
4.0 5.0 6.0 8.0 10.0 |
18.00 22.26 26.46 34.62 42.33 |
8 / 12 | |
| Large Sizes | 200 × 200 |
5.0 6.0 8.0 10.0 12.5 |
30.11 35.88 47.18 58.03 71.07 |
12 / 15 |
| 300 × 300 |
6.0 8.0 10.0 12.5 16.0 |
54.72 72.30 89.43 110.31 138.96 |
12 / 15 | |
| Jumbo Sizes | 400 × 400 |
10.0 12.5 16.0 20.0 |
121.00 149.00 189.00 233.00 |
12 to 18 |
| 500 × 500 |
12.5 16.0 22.0 25.0 |
189.00 239.00 324.00 365.00 |
12 to 18 |
Dimensional tolerances ensure interchangeability and fabrication accuracy. The allowable deviations vary by manufacturing standard, with ASTM A500 and EN 10219 being the most widely referenced specifications for structural square tubes.
| Item | ASTM A500 | EN 10219 |
|---|---|---|
| Outside Dimension | ±0.020 in to 1% | According to EN tolerance class |
| Wall Thickness | ±10% | Standard tolerance |
| Straightness | 1/8 in per 5 ft | According to EN 10219 |
| Squareness | 90° ±1.5° | Standard requirement |
The applicable manufacturing standard should always be referenced when dimensional accuracy is critical for fabrication or structural applications.
The table below lists the approximate theoretical weights of commonly used square tube sizes. Actual weight may vary slightly depending on the manufacturing standard and dimensional tolerance.
| Outside Dimension | Wall Thickness | Theoretical Weight |
|---|---|---|
| 20 × 20 mm | 2.0 mm | 1.07 kg/m |
| 25 × 25 mm | 2.0 mm | 1.39 kg/m |
| 40 × 40 mm | 3.0 mm | 3.47 kg/m |
| 50 × 50 mm | 4.0 mm | 5.45 kg/m |
| 75 × 75 mm | 5.0 mm | 10.51 kg/m |
| 100 × 100 mm | 6.0 mm | 17.04 kg/m |
| 150 × 150 mm | 8.0 mm | 34.62 kg/m |
| 200 × 200 mm | 10.0 mm | 58.03 kg/m |
| 300 × 300 mm | 12.5 mm | 110.31 kg/m |
| 400 × 400 mm | 16.0 mm | 189.00 kg/m |
For additional sizes and wall thickness combinations, see our complete Square Tube Weight Calculator and weight tables.
| Standard | Typical Market | Unit | Typical Size Range |
|---|---|---|---|
| ASTM A500 | North America | inch | 1" × 1" to 22" × 22" |
| EN 10219 | Europe | mm | 20 × 20 mm to 500 × 500 mm |
| EN 10210 | Europe | mm | Structural hot-finished SHS |
| GB/T 6728 | China | mm | 10 × 10 mm to 500 × 500 mm |
| JIS G3466 | Japan | mm | Metric square tubes |
| AS/NZS 1163 | Australia & New Zealand | mm | Structural SHS |
Square tubes are manufactured to several international standards. Although the basic dimensional system is similar, the available sizes, wall thicknesses, steel grades, and tolerances differ between standards.
The table below provides general recommendations for commonly used square tube sizes in different applications. Final dimensions should always be determined by project requirements and applicable design standards.
| Application | Recommended Size | Typical Wall Thickness |
|---|---|---|
| Furniture | 20 × 20–30 × 30 | 1.0–2.0 |
| Handrails & Fences | 30 × 30–50 × 50 | 1.5–3.0 |
| Equipment Frames | 40 × 40–80 × 80 | 2.0–4.0 |
| Machine Frames | 50 × 50–100 × 100 | 3.0–6.0 |
| Structural Columns | 100 × 100–200 × 200 | 4.0–10.0 |
| Bridges & Heavy Structures | ≥200 × 200 | ≥8.0 |
Q1. What are the standard square tube sizes?
Standard square tubes are available in metric sizes from 20 × 20 mm to 500 × 500 mm and imperial sizes from 1 × 1 in. to 22 × 22 in. Available wall thicknesses vary according to the selected size and manufacturing standard.
Q2. What is the standard length of square tubing?
Standard production lengths are typically 6 m, 9 m, and 12 m for metric products and 20 ft, 24 ft, 40 ft, and 48 ft for imperial products. Custom cut lengths are widely available.
Q3. What is the largest standard square tube size?
Standard production sizes commonly reach 500 × 500 mm under metric standards and 22 × 22 inches under ASTM specifications. Larger custom sections may be available from selected manufacturers.
Q4. How is square tube weight determined?
Square tube weight depends primarily on the outside dimensions and wall thickness. Standard weight charts provide quick reference, while weight calculators are commonly used for custom dimensions.
Q5. What dimensional tolerances apply to square tubes?
Dimensional tolerances are specified by the applicable manufacturing standard, such as ASTM A500 or EN 10219, and typically cover outside dimensions, wall thickness, straightness, and squareness.
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