HSS6x3x3/8 — Dimensions, Weight & Section Properties
Hollow structural section per ASTM A500 / AISC Steel Construction Manual
HSS6x3x3/8 is an American hollow structural section (HSS) 6×3 inches (152.4×76.2 mm) with a nominal 0.375 in wall, weighing 19.82 pounds per foot (29.5 kg/m). Section properties below are the AISC published values, computed with the A500 design wall thickness of 0.93×nominal — with metric equivalents alongside.
Typical uses: columns, braces, truss members, equipment frames, and architectural steel — closed sections excel in compression and torsion and take paint beautifully. For a quick stiffness check, see the deflection example below or open the beam calculator with your own span and load.
Dimensions
| Height h | 6 in (152.4 mm) |
| Width b | 3 in (76.2 mm) |
| Nominal wall t | 0.375 in (9.5 mm) |
| Design wall (0.93t) | 0.349 in (8.9 mm) |
Weight & Cross-Section
| Weight per foot | 19.82 lb/ft (29.5 kg/m) |
| 20 ft bar | 396 lb |
| 40 ft bar | 793 lb |
| Area A | 5.48 in² (35.4 cm²) |
Section Properties (strong / weak axis)
| Moment of inertia Ix | 22.7 in⁴ (945 cm⁴) |
| Section modulus Sx | 7.57 in³ (124 cm³) |
| Radius of gyration rx | 2.04 in |
| Moment of inertia Iy | 7.31 in⁴ (304 cm⁴) |
| Section modulus Sy | 4.87 in³ (80 cm³) |
| Radius of gyration ry | 1.15 in |
Compared with the neighbouring sizes
| Shape | h × b (in) | lb/ft | Ix (in⁴) | Sx (in³) | Δ weight | Δ Ix |
|---|---|---|---|---|---|---|
| HSS6x3x1/4 | 6 × 3 | 13.91 | 17 | 5.66 | −30 % | −25 % |
| HSS6x3x3/8 (this page) | 6 × 3 | 19.82 | 22.7 | 7.57 | — | — |
Deflection example
A simply supported HSS6x3x3/8 spanning 10 ft with a 10 kip point load at midspan deflects 0.55 in (E = 29,000 ksi, Ix = 22.7 in⁴). The L/360 serviceability limit for this span is 0.33 in — the shape does NOT pass this quick check.
Calculate with your own span and load →
Frequently asked questions
How much does a HSS6x3x3/8 tube weigh?
HSS6x3x3/8 weighs 19.82 pounds per foot (29.5 kg/m). A 20 ft bar weighs 396 lb and a 40 ft bar 793 lb.
What are the dimensions of a HSS6x3x3/8?
HSS6x3x3/8 is 6×3 in (152.4×76.2 mm) outside, with a nominal wall of 0.375 in. Note that A500 tolerances put the design wall at 0.93×nominal (0.349 in) — the section properties listed already account for this.
What are the dimensions of a HSS6x3x3/8 in mm?
HSS6x3x3/8 is 152.4×76.2 mm outside with a nominal wall of 9.5 mm. In metric section properties: Ix = 945 cm⁴, Sx = 124 cm³.
How much does a HSS6x3x3/8 weigh in kg?
29.5 kg per meter. A 6 m bar weighs 177 kg and a 12 m bar 354 kg — handy when ordering US shapes from metric suppliers.
What is the moment of inertia of a HSS6x3x3/8?
About the strong axis, Ix = 22.7 in⁴ (945 cm⁴) with section modulus Sx = 7.57 in³. About the weak axis, Iy = 7.31 in⁴ and Sy = 4.87 in³. Use the beam deflection calculator to turn these into deflection and stress for your span and load.
HSS6x3x3/8 or HSS6x3x1/4 — what does one size down change?
HSS6x3x1/4 is about 30% lighter (13.91 vs 19.82 lb/ft) but about 25% less stiff (Ix 17 vs 22.7 in⁴). Check deflection before downsizing — stiffness falls much faster than weight.
Values are entered from the governing standard’s published tables and cross-checked programmatically against its mass and section formulas before publication. Spotted an error? Write to advertising@metalabout.net — verified corrections ship within days. About