Dimensions
| Parameter | Symbol | Value | Unit | US customary | Data |
|---|---|---|---|---|---|
| Depth | d | 101.6 | mm | 4.000 in | U |
| Width | b | 101.6 | mm | 4.000 in | U |
| Thickness | t | 9.5 | mm | 0.375 in | U |
| Design wall thickness (0.93t) | tdes | 8.9 | mm | 0.349 in | C |
| Outer corner radius (assumed) | ro | 17.7 | mm | 0.698 in | U |
Section Properties
| Parameter | Symbol | Value | Unit | US customary | Data |
|---|---|---|---|---|---|
| General | |||||
| Mass per metreWeight based on nominal wall thickness; all other properties use tdes = 0.93t (AISC 360 B4.2) | mass | 25.70 | kg/m | 17.27 lb/ft | C |
| Gross area | A | 3,084 | mm² | 4.78 in² | C |
| About x-axis (major) | |||||
| Second moment of area Ix | Ix | 4.266 | 10⁶ mm⁴ | 10.2 in⁴ | C |
| Elastic section modulus Zx (min) | Zx | 84.0 | 10³ mm³ | 5.12 in³ | C |
| Plastic section modulus Sx | Sx | 104.7 | 10³ mm³ | 6.39 in³ | C |
| Radius of gyration rx | rx | 37.2 | mm | 1.464 in | C |
| About y-axis (minor) | |||||
| Second moment of area Iy | Iy | 4.266 | 10⁶ mm⁴ | 10.2 in⁴ | C |
| Elastic section modulus Zy (min) | Zy | 84.0 | 10³ mm³ | 5.12 in³ | C |
| Plastic section modulus Sy | Sy | 104.7 | 10³ mm³ | 6.39 in³ | C |
| Radius of gyration ry | ry | 37.2 | mm | 1.464 in | C |
| Torsion & warping | |||||
| Torsion constant JThin-walled closed-section approximation | J | 7.347 | 10⁶ mm⁴ | 17.7 in⁴ | C |
| Surface area | |||||
| External surface area | extArea | 0.376 | m²/m | 1.234 ft²/ft | C |
| Internal surface area | intArea | 0.320 | m²/m | 1.051 ft²/ft | C |
Nominal designation mass 25.70 kg/m; calculated 25.70 kg/m (-0.0%).
Steel Grades
| Grade | Standard | fy MPa | fu MPa | Note | Data |
|---|---|---|---|---|---|
| A500 Grade C (square/rect.) | ASTM A500/A500M | 345 | 425 | Common grade for square/rectangular HSS | U |
Strengths shown for governing thickness t = 9.5 mm. Density 7850 kg/m³, E = 200 000 MPa.
Where to buy
Producers of Hollow sections & pipes – local mills first. Buy direct from the mill for large tonnages, or through a steel distributor / stockist for small quantities and cut lengths.
Local producer
Standards: ASTM A500, ASTM A1085
International producer
Standards: JIS G 3444
International producer
Standards: EN 10210, EN 10219
International producer
Standards: JIS G 3444, JIS G 3466
International producer
Standards: GB/T 8162, GB/T 8163
International producer
Standards: AS/NZS 1163
Buying checklist
- Specify the section designation, product standard and steel grade exactly (e.g. "HSS4x4x3/8 – ASTM A500/A500M – A500 Grade C (square/rect.)").
- Ask for mill test certificates (EN 10204 type 3.1 or equivalent) traceable to the heat number.
- Sections from another standard system are not automatically equivalent – have the engineer approve any substitution.
- Check availability, minimum order quantity, stock lengths, lead time and delivery terms with the mill or distributor.
All producers of this product type →
Listing is informational only – not an endorsement, offer or confirmation of availability. Company details are marked UNVERIFIED until checked.
Source & Verification
- Source publisher
- Pending verification – nominal dimensions entered by the application developer
- Source document
- ASTM A500/A500M and AISC Shapes Database (square HSS)
- Edition
- —
- Publication year
- —
- Page reference
- —
- Last updated
- 2026-10-12
- Verification status
- Unverified
Outer corner radius 2.0 × design wall thickness (AISC convention) for property calculation; confirm against ASTM A500/A500M and AISC Shapes Database (square HSS) and the manufacturer catalogue. Typical grade: A500 Gr C.