W33x130 — Dimensions, Weight & Section Properties
American wide-flange (W) beam per ASTM A6 / AISC Steel Construction Manual
W33x130 is an American wide-flange beam 33.1 inches (840.7 mm) deep with a 11.5 in (292.1 mm) flange, weighing 130 pounds per foot (193.5 kg/m) — that is what the "130" in the designation means. All values below are the standard AISC published section properties used in US structural design, with metric equivalents alongside.
Typical uses: floor and roof framing, columns, headers, and general steel construction. For a quick stiffness check, see the deflection example below or open the beam calculator with your own span and load.
Dimensions
| Depth d | 33.1 in (840.7 mm) |
| Flange width bf | 11.5 in (292.1 mm) |
| Web thickness tw | 0.58 in (14.7 mm) |
| Flange thickness tf | 0.855 in (21.7 mm) |
Weight & Cross-Section
| Weight per foot | 130 lb/ft (193.5 kg/m) |
| 20 ft bar | 2,600 lb |
| 40 ft bar | 5,200 lb |
| Area A | 38.3 in² (247.1 cm²) |
Section Properties (strong / weak axis)
| Moment of inertia Ix | 6,710 in⁴ (279,290 cm⁴) |
| Section modulus Sx | 406 in³ (6,653 cm³) |
| Radius of gyration rx | 13.2 in |
| Moment of inertia Iy | 218 in⁴ (9,074 cm⁴) |
| Section modulus Sy | 37.9 in³ (621 cm³) |
| Radius of gyration ry | 2.39 in |
Compared with the neighbouring sizes
| Shape | d × bf (in) | lb/ft | Ix (in⁴) | Sx (in³) | Δ weight | Δ Ix |
|---|---|---|---|---|---|---|
| W33x118 | 32.9 × 11.5 | 118 | 5,900 | 359 | −9 % | −12 % |
| W33x130 (this page) | 33.1 × 11.5 | 130 | 6,710 | 406 | — | — |
| W33x141 | 33.3 × 11.5 | 141 | 7,450 | 448 | +8 % | +11 % |
Deflection example
A simply supported W33x130 spanning 53 ft with a 10 kip point load at midspan deflects 0.28 in (E = 29,000 ksi, Ix = 6,710 in⁴). The L/360 serviceability limit for this span is 1.77 in — the shape passes this quick check.
Calculate with your own span and load →
Frequently asked questions
How much does a W33x130 beam weigh?
W33x130 weighs 130 pounds per foot (193.5 kg/m). The number after the "x" in the designation is always the weight in lb/ft. A 20 ft bar weighs 2,600 lb and a 40 ft bar 5,200 lb.
What are the dimensions of a W33x130?
W33x130 is 33.1 in (840.7 mm) deep with a 11.5 in (292.1 mm) wide flange. The web is 0.58 in thick and the flanges are 0.86 in thick. Note the actual depth differs from the nominal W33 label — always design with the actual value.
What are the dimensions of a W33x130 in mm?
W33x130 is 840.7 mm deep with a 292.1 mm wide flange; the web is 14.7 mm and the flange 21.7 mm thick. In metric section properties: Ix = 279,290 cm⁴, Sx = 6,653 cm³.
How much does a W33x130 weigh in kg?
193.5 kg per meter. A 6 m bar weighs 1,161 kg and a 12 m bar 2,322 kg — handy when ordering US shapes from metric suppliers.
What is the moment of inertia of a W33x130?
About the strong axis, Ix = 6,710 in⁴ (279,290 cm⁴) with section modulus Sx = 406 in³. About the weak axis, Iy = 218 in⁴ and Sy = 37.9 in³. Use the beam deflection calculator to turn these into deflection and stress for your span and load.
W33x130 or W33x141 — what does one size up change?
W33x141 is about 8% heavier (141 vs 130 lb/ft) but about 11% stiffer (Ix 7,450 vs 6,710 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