W16x89 — Dimensions, Weight & Section Properties
American wide-flange (W) beam per ASTM A6 / AISC Steel Construction Manual
W16x89 is an American wide-flange beam 16.8 inches (426.7 mm) deep with a 10.4 in (264.2 mm) flange, weighing 89 pounds per foot (132.4 kg/m) — that is what the "89" 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 | 16.8 in (426.7 mm) |
| Flange width bf | 10.4 in (264.2 mm) |
| Web thickness tw | 0.525 in (13.3 mm) |
| Flange thickness tf | 0.875 in (22.2 mm) |
Weight & Cross-Section
| Weight per foot | 89 lb/ft (132.4 kg/m) |
| 20 ft bar | 1,780 lb |
| 40 ft bar | 3,560 lb |
| Area A | 26.2 in² (169 cm²) |
Section Properties (strong / weak axis)
| Moment of inertia Ix | 1,300 in⁴ (54,110 cm⁴) |
| Section modulus Sx | 155 in³ (2,540 cm³) |
| Radius of gyration rx | 7.05 in |
| Moment of inertia Iy | 163 in⁴ (6,785 cm⁴) |
| Section modulus Sy | 31.4 in³ (515 cm³) |
| Radius of gyration ry | 2.49 in |
Compared with the neighbouring sizes
| Shape | d × bf (in) | lb/ft | Ix (in⁴) | Sx (in³) | Δ weight | Δ Ix |
|---|---|---|---|---|---|---|
| W16x77 | 16.5 × 10.3 | 77 | 1,110 | 134 | −13 % | −15 % |
| W16x89 (this page) | 16.8 × 10.4 | 89 | 1,300 | 155 | — | — |
| W16x100 | 17 × 10.4 | 100 | 1,490 | 175 | +12 % | +15 % |
Deflection example
A simply supported W16x89 spanning 27 ft with a 10 kip point load at midspan deflects 0.19 in (E = 29,000 ksi, Ix = 1,300 in⁴). The L/360 serviceability limit for this span is 0.9 in — the shape passes this quick check.
Calculate with your own span and load →
Frequently asked questions
How much does a W16x89 beam weigh?
W16x89 weighs 89 pounds per foot (132.4 kg/m). The number after the "x" in the designation is always the weight in lb/ft. A 20 ft bar weighs 1,780 lb and a 40 ft bar 3,560 lb.
What are the dimensions of a W16x89?
W16x89 is 16.8 in (426.7 mm) deep with a 10.4 in (264.2 mm) wide flange. The web is 0.53 in thick and the flanges are 0.88 in thick. Note the actual depth differs from the nominal W16 label — always design with the actual value.
What are the dimensions of a W16x89 in mm?
W16x89 is 426.7 mm deep with a 264.2 mm wide flange; the web is 13.3 mm and the flange 22.2 mm thick. In metric section properties: Ix = 54,110 cm⁴, Sx = 2,540 cm³.
How much does a W16x89 weigh in kg?
132.4 kg per meter. A 6 m bar weighs 795 kg and a 12 m bar 1,589 kg — handy when ordering US shapes from metric suppliers.
What is the moment of inertia of a W16x89?
About the strong axis, Ix = 1,300 in⁴ (54,110 cm⁴) with section modulus Sx = 155 in³. About the weak axis, Iy = 163 in⁴ and Sy = 31.4 in³. Use the beam deflection calculator to turn these into deflection and stress for your span and load.
W16x89 or W16x100 — what does one size up change?
W16x100 is about 12% heavier (100 vs 89 lb/ft) but about 15% stiffer (Ix 1,490 vs 1,300 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