W14x370 — Dimensions, Weight & Section Properties
American wide-flange (W) beam per ASTM A6 / AISC Steel Construction Manual
W14x370 is an American wide-flange beam 17.9 inches (454.7 mm) deep with a 16.5 in (419.1 mm) flange, weighing 370 pounds per foot (550.6 kg/m) — that is what the "370" 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 | 17.9 in (454.7 mm) |
| Flange width bf | 16.5 in (419.1 mm) |
| Web thickness tw | 1.66 in (42.2 mm) |
| Flange thickness tf | 2.66 in (67.6 mm) |
Weight & Cross-Section
| Weight per foot | 370 lb/ft (550.6 kg/m) |
| 20 ft bar | 7,400 lb |
| 40 ft bar | 14,800 lb |
| Area A | 109 in² (703.2 cm²) |
Section Properties (strong / weak axis)
| Moment of inertia Ix | 5,440 in⁴ (226,429 cm⁴) |
| Section modulus Sx | 607 in³ (9,947 cm³) |
| Radius of gyration rx | 7.07 in |
| Moment of inertia Iy | 1,990 in⁴ (82,830 cm⁴) |
| Section modulus Sy | 241 in³ (3,949 cm³) |
| Radius of gyration ry | 4.27 in |
Compared with the neighbouring sizes
| Shape | d × bf (in) | lb/ft | Ix (in⁴) | Sx (in³) | Δ weight | Δ Ix |
|---|---|---|---|---|---|---|
| W14x342 | 17.5 × 16.4 | 342 | 4,900 | 559 | −8 % | −10 % |
| W14x370 (this page) | 17.9 × 16.5 | 370 | 5,440 | 607 | — | — |
| W14x398 | 18.3 × 16.6 | 398 | 6,000 | 656 | +8 % | +10 % |
Deflection example
A simply supported W14x370 spanning 29 ft with a 10 kip point load at midspan deflects 0.06 in (E = 29,000 ksi, Ix = 5,440 in⁴). The L/360 serviceability limit for this span is 0.97 in — the shape passes this quick check.
Calculate with your own span and load →
Frequently asked questions
How much does a W14x370 beam weigh?
W14x370 weighs 370 pounds per foot (550.6 kg/m). The number after the "x" in the designation is always the weight in lb/ft. A 20 ft bar weighs 7,400 lb and a 40 ft bar 14,800 lb.
What are the dimensions of a W14x370?
W14x370 is 17.9 in (454.7 mm) deep with a 16.5 in (419.1 mm) wide flange. The web is 1.66 in thick and the flanges are 2.66 in thick. Note the actual depth differs from the nominal W14 label — always design with the actual value.
What are the dimensions of a W14x370 in mm?
W14x370 is 454.7 mm deep with a 419.1 mm wide flange; the web is 42.2 mm and the flange 67.6 mm thick. In metric section properties: Ix = 226,429 cm⁴, Sx = 9,947 cm³.
How much does a W14x370 weigh in kg?
550.6 kg per meter. A 6 m bar weighs 3,304 kg and a 12 m bar 6,608 kg — handy when ordering US shapes from metric suppliers.
What is the moment of inertia of a W14x370?
About the strong axis, Ix = 5,440 in⁴ (226,429 cm⁴) with section modulus Sx = 607 in³. About the weak axis, Iy = 1,990 in⁴ and Sy = 241 in³. Use the beam deflection calculator to turn these into deflection and stress for your span and load.
W14x370 or W14x398 — what does one size up change?
W14x398 is about 8% heavier (398 vs 370 lb/ft) but about 10% stiffer (Ix 6,000 vs 5,440 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