HSS6.625x0.280
HSS6.625x0.280 Round HSS
Dimensions
| Parameter | Symbol | Value | Unit | US customary | Data |
|---|---|---|---|---|---|
| Outside diameter | D | 168.3 | mm | 6.625 in | U |
| Thickness | t | 7.1 | mm | 0.280 in | U |
| Design wall thickness (0.93t) | tdes | 6.6 | mm | 0.260 in | C |
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 | 28.27 | kg/m | 18.99 lb/ft | C |
| Gross area | A | 3,359 | mm² | 5.21 in² | C |
| About x-axis (major) | |||||
| Second moment of area Ix | Ix | 10.992 | 10⁶ mm⁴ | 26.4 in⁴ | C |
| Elastic section modulus Zx (min) | Zx | 130.6 | 10³ mm³ | 7.97 in³ | C |
| Plastic section modulus Sx | Sx | 173.0 | 10³ mm³ | 10.55 in³ | C |
| Radius of gyration rx | rx | 57.2 | mm | 2.252 in | C |
| About y-axis (minor) | |||||
| Second moment of area Iy | Iy | 10.992 | 10⁶ mm⁴ | 26.4 in⁴ | C |
| Elastic section modulus Zy (min) | Zy | 130.6 | 10³ mm³ | 7.97 in³ | C |
| Plastic section modulus Sy | Sy | 173.0 | 10³ mm³ | 10.55 in³ | C |
| Radius of gyration ry | ry | 57.2 | mm | 2.252 in | C |
| Torsion & warping | |||||
| Torsion constant JExact (2I) | J | 21.984 | 10⁶ mm⁴ | 52.8 in⁴ | C |
| Surface area | |||||
| External surface area | extArea | 0.529 | m²/m | 1.735 ft²/ft | C |
| Internal surface area | intArea | 0.487 | m²/m | 1.598 ft²/ft | C |
Nominal designation mass 28.31 kg/m; calculated 28.27 kg/m (-0.1%).
Steel Grades
| Grade | Standard | fy MPa | fu MPa | Note | Data |
|---|---|---|---|---|---|
| A500 Grade C (round) | ASTM A500/A500M | 317 | 425 | Common grade for round HSS | U |
Strengths shown for governing thickness t = 7.1 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. "HSS6.625x0.280 – ASTM A500/A500M – A500 Grade C (round)").
- 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 (round HSS)
- Edition
- —
- Publication year
- —
- Page reference
- —
- Last updated
- 2026-10-12
- Verification status
- Unverified
Typical grade: A500 Gr C. Nominal dimensions require verification against ASTM A500/A500M and AISC Shapes Database (round HSS) and the manufacturer catalogue.