W36x135 — Dimensions, Weight & Section Properties
American wide-flange (W) beam per ASTM A6 / AISC Steel Construction Manual
W36x135 is an American wide-flange beam 35.6 inches (904.2 mm) deep with a 12 in (304.8 mm) flange, weighing 135 pounds per foot (200.9 kg/m) — that is what the "135" 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 | 35.6 in (904.2 mm) |
| Flange width bf | 12 in (304.8 mm) |
| Web thickness tw | 0.6 in (15.2 mm) |
| Flange thickness tf | 0.79 in (20.1 mm) |
Weight & Cross-Section
| Weight per foot | 135 lb/ft (200.9 kg/m) |
| 20 ft bar | 2,700 lb |
| 40 ft bar | 5,400 lb |
| Area A | 39.9 in² (257.4 cm²) |
Section Properties (strong / weak axis)
| Moment of inertia Ix | 7,800 in⁴ (324,659 cm⁴) |
| Section modulus Sx | 439 in³ (7,194 cm³) |
| Radius of gyration rx | 14 in |
| Moment of inertia Iy | 225 in⁴ (9,365 cm⁴) |
| Section modulus Sy | 37.7 in³ (618 cm³) |
| Radius of gyration ry | 2.38 in |
Compared with the neighbouring sizes
| Shape | d × bf (in) | lb/ft | Ix (in⁴) | Sx (in³) | Δ weight | Δ Ix |
|---|---|---|---|---|---|---|
| W36x135 (this page) | 35.6 × 12 | 135 | 7,800 | 439 | — | — |
| W36x150 | 35.9 × 12 | 150 | 9,040 | 504 | +11 % | +16 % |
Deflection example
A simply supported W36x135 spanning 57 ft with a 10 kip point load at midspan deflects 0.3 in (E = 29,000 ksi, Ix = 7,800 in⁴). The L/360 serviceability limit for this span is 1.9 in — the shape passes this quick check.
Calculate with your own span and load →
Frequently asked questions
How much does a W36x135 beam weigh?
W36x135 weighs 135 pounds per foot (200.9 kg/m). The number after the "x" in the designation is always the weight in lb/ft. A 20 ft bar weighs 2,700 lb and a 40 ft bar 5,400 lb.
What are the dimensions of a W36x135?
W36x135 is 35.6 in (904.2 mm) deep with a 12 in (304.8 mm) wide flange. The web is 0.6 in thick and the flanges are 0.79 in thick. Note the actual depth differs from the nominal W36 label — always design with the actual value.
What are the dimensions of a W36x135 in mm?
W36x135 is 904.2 mm deep with a 304.8 mm wide flange; the web is 15.2 mm and the flange 20.1 mm thick. In metric section properties: Ix = 324,659 cm⁴, Sx = 7,194 cm³.
How much does a W36x135 weigh in kg?
200.9 kg per meter. A 6 m bar weighs 1,205 kg and a 12 m bar 2,411 kg — handy when ordering US shapes from metric suppliers.
What is the moment of inertia of a W36x135?
About the strong axis, Ix = 7,800 in⁴ (324,659 cm⁴) with section modulus Sx = 439 in³. About the weak axis, Iy = 225 in⁴ and Sy = 37.7 in³. Use the beam deflection calculator to turn these into deflection and stress for your span and load.
W36x135 or W36x150 — what does one size up change?
W36x150 is about 11% heavier (150 vs 135 lb/ft) but about 16% stiffer (Ix 9,040 vs 7,800 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