W14x34 — Dimensions, Weight & Section Properties
American wide-flange (W) beam per ASTM A6 / AISC Steel Construction Manual
W14x34 is an American wide-flange beam 14 inches (355.6 mm) deep with a 6.75 in (171.5 mm) flange, weighing 34 pounds per foot (50.6 kg/m) — that is what the "34" 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 | 14 in (355.6 mm) |
| Flange width bf | 6.75 in (171.5 mm) |
| Web thickness tw | 0.285 in (7.2 mm) |
| Flange thickness tf | 0.455 in (11.6 mm) |
Weight & Cross-Section
| Weight per foot | 34 lb/ft (50.6 kg/m) |
| 20 ft bar | 680 lb |
| 40 ft bar | 1,360 lb |
| Area A | 10 in² (64.5 cm²) |
Section Properties (strong / weak axis)
| Moment of inertia Ix | 340 in⁴ (14,152 cm⁴) |
| Section modulus Sx | 48.6 in³ (796 cm³) |
| Radius of gyration rx | 5.83 in |
| Moment of inertia Iy | 23.3 in⁴ (970 cm⁴) |
| Section modulus Sy | 6.91 in³ (113 cm³) |
| Radius of gyration ry | 1.53 in |
Compared with the neighbouring sizes
| Shape | d × bf (in) | lb/ft | Ix (in⁴) | Sx (in³) | Δ weight | Δ Ix |
|---|---|---|---|---|---|---|
| W14x30 | 13.8 × 6.73 | 30 | 291 | 42 | −12 % | −14 % |
| W14x34 (this page) | 14 × 6.75 | 34 | 340 | 48.6 | — | — |
| W14x38 | 14.1 × 6.77 | 38 | 385 | 54.6 | +12 % | +13 % |
Deflection example
A simply supported W14x34 spanning 22 ft with a 10 kip point load at midspan deflects 0.39 in (E = 29,000 ksi, Ix = 340 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 W14x34 beam weigh?
W14x34 weighs 34 pounds per foot (50.6 kg/m). The number after the "x" in the designation is always the weight in lb/ft. A 20 ft bar weighs 680 lb and a 40 ft bar 1,360 lb.
What are the dimensions of a W14x34?
W14x34 is 14 in (355.6 mm) deep with a 6.75 in (171.5 mm) wide flange. The web is 0.29 in thick and the flanges are 0.46 in thick. Note the actual depth differs from the nominal W14 label — always design with the actual value.
What are the dimensions of a W14x34 in mm?
W14x34 is 355.6 mm deep with a 171.5 mm wide flange; the web is 7.2 mm and the flange 11.6 mm thick. In metric section properties: Ix = 14,152 cm⁴, Sx = 796 cm³.
How much does a W14x34 weigh in kg?
50.6 kg per meter. A 6 m bar weighs 304 kg and a 12 m bar 607 kg — handy when ordering US shapes from metric suppliers.
What is the moment of inertia of a W14x34?
About the strong axis, Ix = 340 in⁴ (14,152 cm⁴) with section modulus Sx = 48.6 in³. About the weak axis, Iy = 23.3 in⁴ and Sy = 6.91 in³. Use the beam deflection calculator to turn these into deflection and stress for your span and load.
W14x34 or W14x38 — what does one size up change?
W14x38 is about 12% heavier (38 vs 34 lb/ft) but about 13% stiffer (Ix 385 vs 340 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