HSS 12 × 12 × 5/16" (304.8 × 304.8 × 7.94 mm) ASTM A500 Grade B/C Square HSS
304.8x304.8x7.94mm 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 72.73749 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.
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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 | 304.8mm × 304.8mm × 7.94mm |
| Weight per Meter | 72.737 kg/m |
| Material | Steel |
| Alloy/Grade | ASTM A500 Grade B, C |
| Standard | ASTM A500/A500M |
| Standard Length | 6m |
| Designation (inch) | HSS 12 × 12 × 5/16 |
| Weight (lb/ft) | 48.88 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) | 86.4 cm² |
| Second moment of area(I) | 12639 cm⁴ |
| Radius of gyration(i) | 12.1 cm |
| Elastic section modulus(Wel) | 829 cm³ |
| Plastic section modulus(Wpl) | 959 cm³ |
| Torsional inertia constant(It) | 19711 cm⁴ |
| Torsional modulus constant(Ct) | 1245 cm³ |
| Surface area per metre(As) | 1.19 m²/m |
| Length per tonne | 13.7 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) | 261 kNm · 193 kip·ft | 2723 kN · 612 kips |
| Grade C | 50 ksi (345 MPa) | 62 ksi (425 MPa) | 286 kNm · 211 kip·ft | 2982 kN · 670 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: 300 × 300 × 8 mm →
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