0.839" × 0.120" (Ø21.3×3.05 mm) ASTM A500 Grade B/C Round HSS
21.3x3.05mm Steel round 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 1.372721 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 medium-duty Steel round hss is commonly specified for furniture manufacturing, enclosures, brackets, and general fabrication. The 3.05mm wall thickness provides excellent strength-to-weight ratio 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 | Ø 21.3mm × 3.05mm wall |
| Weight per Meter | 1.373 kg/m |
| Material | Steel |
| Alloy/Grade | ASTM A500 Grade B, C |
| Standard | ASTM A500/A500M |
| Standard Length | 6m |
| OD × Wall (inch) | 0.839 × 0.120 in |
| Weight (lb/ft) | 0.92 lb/ft |
| 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) | 1.65 cm² |
| Second moment of area(I) | 0.718 cm⁴ |
| Radius of gyration(i) | 0.660 cm |
| Elastic section modulus(Wel) | 0.674 cm³ |
| Plastic section modulus(Wpl) | 0.975 cm³ |
| Torsional inertia constant(It) | 1.44 cm⁴ |
| Torsional modulus constant(Ct) | 1.35 cm³ |
| Surface area per metre(As) | 0.0669 m²/m |
| Length per tonne | 728 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 | 42 ksi (290 MPa) | 58 ksi (400 MPa) | 0.195 kNm · 0.144 kip·ft | 47.7 kN · 10.7 kips |
| Grade C | 46 ksi (315 MPa) | 62 ksi (425 MPa) | 0.212 kNm · 0.157 kip·ft | 51.8 kN · 11.7 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: Ø21.3 × 3 mm →
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