HSS 3½ × 3½ × 5/16" (88.9 × 88.9 × 7.94 mm) ASTM A500 Grade B/C Square HSS
88.9x88.9x7.94mm Steel square hss in ASTM A500 Grade B, Grade C to ASTM A500/A500M, with an uncoated steel surface suitable for further processing or painting. Nominal weight 18.910166 kg/m.
Minimum order
Minimum 10 t per size. If the size is already in the current production cycle, we can accept orders from 5 t. Standard length 6 m; 4–12 m on request. We confirm the minimum, lead time and grade in your quote.
Add to Quote Request
Select length and quantity to add to your quote cart
Minimum order: 10 t per size (from 5 t if the size is in production)
Applications & Usage
This extra heavy-duty industrial Steel square hss is commonly specified for heavy structural supports, load-bearing frames, and demanding industrial applications. The 7.94mm wall thickness provides exceptional structural integrity while maintaining workability. The natural mill finish provides a cost-effective solution for applications where aesthetics are secondary. Available in standard lengths of 6m, this profile can be easily cut, drilled, and welded to suit your specific requirements.
Technical Specifications
| Specification | Value |
|---|---|
| Dimensions | 88.9mm × 88.9mm × 7.94mm |
| Weight per Meter | 18.91 kg/m |
| Material | Steel |
| Alloy/Grade | ASTM A500 Grade B, C |
| Standard | ASTM A500/A500M |
| Standard Length | 6m |
| Designation (inch) | HSS 3½ × 3½ × 5/16 |
| Weight (lb/ft) | 12.71 lb/ft |
| Internal Weld Removal | Available on request |
| Minimum Order per Size | 10 t |
| Cut-to-Length Range | 4000 – 12000 mm |
Section Properties
Calculated with the AISC design wall thickness (0.93 × nominal); mass and length per tonne use the nominal wall.
| Property | Value |
|---|---|
| Cross-sectional area(A) | 22.7 cm² |
| Second moment of area(I) | 243 cm⁴ |
| Radius of gyration(i) | 3.27 cm |
| Elastic section modulus(Wel) | 54.6 cm³ |
| Plastic section modulus(Wpl) | 67.8 cm³ |
| Torsional inertia constant(It) | 416 cm⁴ |
| Torsional modulus constant(Ct) | 83.1 cm³ |
| Surface area per metre(As) | 0.330 m²/m |
| Length per tonne | 52.9 m |
Grade strength and capacity
Minimum strength of each grade this size is rolled in, with the indicative capacity calculated on the AISC design wall (0.93 × nominal).
| Grade | Min. yield | Tensile | Bending Wel·fy | Axial A·fy |
|---|---|---|---|---|
| Grade B | 46 ksi (315 MPa) | 58 ksi (400 MPa) | 17.2 kNm · 12.7 kip·ft | 714 kN · 161 kips |
| Grade C | 50 ksi (345 MPa) | 62 ksi (425 MPa) | 18.9 kNm · 13.9 kip·ft | 782 kN · 176 kips |
Indicative values from nominal dimensions: Wel × fy and A × fy, without buckling, cross-section class or partial safety factors. Not a design check.
Nearest metric size to EN 10219: 90 × 90 × 8 mm →
Similar Sizes
Explore alternative dimensions that might suit your needs