W14x665 — Dimensions, Weight & Section Properties
American wide-flange (W) beam per ASTM A6 / AISC Steel Construction Manual
W14x665 is an American wide-flange beam 21.6 inches (548.6 mm) deep with a 17.7 in (449.6 mm) flange, weighing 665 pounds per foot (989.7 kg/m) — that is what the "665" 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 | 21.6 in (548.6 mm) |
| Flange width bf | 17.7 in (449.6 mm) |
| Web thickness tw | 2.83 in (71.9 mm) |
| Flange thickness tf | 4.52 in (114.8 mm) |
Weight & Cross-Section
| Weight per foot | 665 lb/ft (989.7 kg/m) |
| 20 ft bar | 13,300 lb |
| 40 ft bar | 26,600 lb |
| Area A | 196 in² (1,264.5 cm²) |
Section Properties (strong / weak axis)
| Moment of inertia Ix | 12,400 in⁴ (516,125 cm⁴) |
| Section modulus Sx | 1,150 in³ (18,845 cm³) |
| Radius of gyration rx | 7.98 in |
| Moment of inertia Iy | 4,170 in⁴ (173,568 cm⁴) |
| Section modulus Sy | 472 in³ (7,735 cm³) |
| Radius of gyration ry | 4.62 in |
Compared with the neighbouring sizes
| Shape | d × bf (in) | lb/ft | Ix (in⁴) | Sx (in³) | Δ weight | Δ Ix |
|---|---|---|---|---|---|---|
| W14x605 | 20.9 × 17.4 | 605 | 10,800 | 1,040 | −9 % | −13 % |
| W14x665 (this page) | 21.6 × 17.7 | 665 | 12,400 | 1,150 | — | — |
| W14x730 | 22.4 × 17.9 | 730 | 14,300 | 1,280 | +10 % | +15 % |
Deflection example
A simply supported W14x665 spanning 35 ft with a 10 kip point load at midspan deflects 0.04 in (E = 29,000 ksi, Ix = 12,400 in⁴). The L/360 serviceability limit for this span is 1.17 in — the shape passes this quick check.
Calculate with your own span and load →
Frequently asked questions
How much does a W14x665 beam weigh?
W14x665 weighs 665 pounds per foot (989.7 kg/m). The number after the "x" in the designation is always the weight in lb/ft. A 20 ft bar weighs 13,300 lb and a 40 ft bar 26,600 lb.
What are the dimensions of a W14x665?
W14x665 is 21.6 in (548.6 mm) deep with a 17.7 in (449.6 mm) wide flange. The web is 2.83 in thick and the flanges are 4.52 in thick. Note the actual depth differs from the nominal W14 label — always design with the actual value.
What are the dimensions of a W14x665 in mm?
W14x665 is 548.6 mm deep with a 449.6 mm wide flange; the web is 71.9 mm and the flange 114.8 mm thick. In metric section properties: Ix = 516,125 cm⁴, Sx = 18,845 cm³.
How much does a W14x665 weigh in kg?
989.7 kg per meter. A 6 m bar weighs 5,938 kg and a 12 m bar 11,876 kg — handy when ordering US shapes from metric suppliers.
What is the moment of inertia of a W14x665?
About the strong axis, Ix = 12,400 in⁴ (516,125 cm⁴) with section modulus Sx = 1,150 in³. About the weak axis, Iy = 4,170 in⁴ and Sy = 472 in³. Use the beam deflection calculator to turn these into deflection and stress for your span and load.
W14x665 or W14x730 — what does one size up change?
W14x730 is about 10% heavier (730 vs 665 lb/ft) but about 15% stiffer (Ix 14,300 vs 12,400 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