HSS6x6x3/8 — Dimensions, Weight & Section Properties
Hollow structural section per ASTM A500 / AISC Steel Construction Manual
HSS6x6x3/8 is an American hollow structural section (HSS) 6×6 inches (152.4×152.4 mm) with a nominal 0.375 in wall, weighing 27.48 pounds per foot (40.9 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 | 6 in (152.4 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 | 27.48 lb/ft (40.9 kg/m) |
| 20 ft bar | 550 lb |
| 40 ft bar | 1,099 lb |
| Area A | 7.58 in² (48.9 cm²) |
Section Properties (strong / weak axis)
| Moment of inertia Ix | 39.5 in⁴ (1,644 cm⁴) |
| Section modulus Sx | 13.2 in³ (216 cm³) |
| Radius of gyration rx | 2.28 in |
| Moment of inertia Iy | 39.5 in⁴ (1,644 cm⁴) |
| Section modulus Sy | 13.2 in³ (216 cm³) |
| Radius of gyration ry | 2.28 in |
Compared with the neighbouring sizes
| Shape | h × b (in) | lb/ft | Ix (in⁴) | Sx (in³) | Δ weight | Δ Ix |
|---|---|---|---|---|---|---|
| HSS6x6x5/16 | 6 × 6 | 23.34 | 34.3 | 11.4 | −15 % | −13 % |
| HSS6x6x3/8 (this page) | 6 × 6 | 27.48 | 39.5 | 13.2 | — | — |
| HSS6x6x1/2 | 6 × 6 | 35.24 | 48.3 | 16.1 | +28 % | +22 % |
Deflection example
A simply supported HSS6x6x3/8 spanning 10 ft with a 10 kip point load at midspan deflects 0.31 in (E = 29,000 ksi, Ix = 39.5 in⁴). The L/360 serviceability limit for this span is 0.33 in — the shape passes this quick check.
Calculate with your own span and load →
Frequently asked questions
How much does a HSS6x6x3/8 tube weigh?
HSS6x6x3/8 weighs 27.48 pounds per foot (40.9 kg/m). A 20 ft bar weighs 550 lb and a 40 ft bar 1,099 lb.
What are the dimensions of a HSS6x6x3/8?
HSS6x6x3/8 is 6×6 in (152.4×152.4 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 HSS6x6x3/8 in mm?
HSS6x6x3/8 is 152.4×152.4 mm outside with a nominal wall of 9.5 mm. In metric section properties: Ix = 1,644 cm⁴, Sx = 216 cm³.
How much does a HSS6x6x3/8 weigh in kg?
40.9 kg per meter. A 6 m bar weighs 245 kg and a 12 m bar 491 kg — handy when ordering US shapes from metric suppliers.
What is the moment of inertia of a HSS6x6x3/8?
About the strong axis, Ix = 39.5 in⁴ (1,644 cm⁴) with section modulus Sx = 13.2 in³. About the weak axis, Iy = 39.5 in⁴ and Sy = 13.2 in³. Use the beam deflection calculator to turn these into deflection and stress for your span and load.
HSS6x6x3/8 or HSS6x6x1/2 — what does one size up change?
HSS6x6x1/2 is about 28% heavier (35.24 vs 27.48 lb/ft) but about 22% stiffer (Ix 48.3 vs 39.5 in⁴). Going one step up within the same depth group is usually the cheapest way to cut deflection.
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