W14x30 — Dimensions, Weight & Section Properties
American wide-flange (W) beam per ASTM A6 / AISC Steel Construction Manual
W14x30 is an American wide-flange beam 13.8 inches (350.5 mm) deep with a 6.73 in (170.9 mm) flange, weighing 30 pounds per foot (44.6 kg/m) — that is what the "30" 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.
W14x30: cross-section drawn to scale from the AISC dimensions (d 13.8, bf 6.73, tw 0.27, tf 0.385 in)Dimensions
| Depth d | 13.8 in (350.5 mm) |
| Flange width bf | 6.73 in (170.9 mm) |
| Web thickness tw | 0.27 in (6.9 mm) |
| Flange thickness tf | 0.385 in (9.8 mm) |
Weight & Cross-Section
| Weight per foot | 30 lb/ft (44.6 kg/m) |
| 20 ft bar | 600 lb |
| 40 ft bar | 1,200 lb |
| Area A | 8.85 in² (57.1 cm²) |
Section Properties (strong / weak axis)
| Moment of inertia Ix | 291 in⁴ (12,112 cm⁴) |
| Section modulus Sx | 42 in³ (688 cm³) |
| Radius of gyration rx | 5.73 in |
| Moment of inertia Iy | 19.6 in⁴ (816 cm⁴) |
| Section modulus Sy | 5.82 in³ (95 cm³) |
| Radius of gyration ry | 1.49 in |
Compared with the neighbouring sizes
| Shape | d × bf (in) | lb/ft | Ix (in⁴) | Sx (in³) | Δ weight | Δ Ix |
|---|
| W14x26 | 13.9 × 5.03 | 26 | 245 | 35.3 | −13 % | −16 % |
| W14x30 (this page) | 13.8 × 6.73 | 30 | 291 | 42 | — | — |
| W14x34 | 14 × 6.75 | 34 | 340 | 48.6 | +13 % | +17 % |
Deflection example
A simply supported W14x30 spanning 22 ft with a 10 kip point load at midspan deflects 0.45 in (E = 29,000 ksi, Ix = 291 in⁴). The L/360 serviceability limit for this span is 0.73 in — the shape passes this quick check.
Calculate with your own span and load →
Frequently asked questions
How much does a W14x30 beam weigh?
W14x30 weighs 30 pounds per foot (44.6 kg/m). The number after the "x" in the designation is always the weight in lb/ft. A 20 ft bar weighs 600 lb and a 40 ft bar 1,200 lb.
What are the dimensions of a W14x30?
W14x30 is 13.8 in (350.5 mm) deep with a 6.73 in (170.9 mm) wide flange. The web is 0.27 in thick and the flanges are 0.39 in thick. Note the actual depth differs from the nominal W14 label — always design with the actual value.
What are the dimensions of a W14x30 in mm?
W14x30 is 350.5 mm deep with a 170.9 mm wide flange; the web is 6.9 mm and the flange 9.8 mm thick. In metric section properties: Ix = 12,112 cm⁴, Sx = 688 cm³.
How much does a W14x30 weigh in kg?
44.6 kg per meter. A 6 m bar weighs 268 kg and a 12 m bar 536 kg — handy when ordering US shapes from metric suppliers.
What is the moment of inertia of a W14x30?
About the strong axis, Ix = 291 in⁴ (12,112 cm⁴) with section modulus Sx = 42 in³. About the weak axis, Iy = 19.6 in⁴ and Sy = 5.82 in³. Use the beam deflection calculator to turn these into deflection and stress for your span and load.
W14x30 or W14x34 — what does one size up change?
W14x34 is about 13% heavier (34 vs 30 lb/ft) but about 17% stiffer (Ix 340 vs 291 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