W18x35 is a wide flange steel beam that is 17.7 in deep with a 6 in flange and weighs 35 lb/ft (52 kg/m). Its metric designation is W460x52. All values below come from the AISC Shapes Database v16.0.
W18x35 Dimensions
| Property | Symbol | Imperial | Metric |
|---|---|---|---|
| Nominal weight | W | 35 lb/ft | 52 kg/m |
| Cross-sectional area | A | 10.3 in² | 6,650 mm² |
| Depth | d | 17.7 in | 450 mm |
| Flange width | bf | 6 in | 152 mm |
| Web thickness | tw | 0.3 in | 7.62 mm |
| Flange thickness | tf | 0.425 in | 10.8 mm |
| Distance to web toe of fillet (design) | kdes | 0.827 in | 21 mm |
| Distance to web toe of fillet (detailing) | kdet | 1.125 in | 28.6 mm |
| Web center line to flange toe of fillet | k1 | 0.75 in | 19.1 mm |
| Distance between web toes of fillets | T | 15.5 in | 394 mm |
| Workable gage (inner holes) | WGi | 3.5 in | 88.9 mm |
W18x35 Section Properties
| Property | Symbol | Imperial | Metric |
|---|---|---|---|
| Moment of inertia, x-axis | Ix | 510 in⁴ | 212 ×10⁶ mm⁴ |
| Elastic section modulus, x-axis | Sx | 57.6 in³ | 944 ×10³ mm³ |
| Plastic section modulus, x-axis | Zx | 66.5 in³ | 1,090 ×10³ mm³ |
| Radius of gyration, x-axis | rx | 7.04 in | 179 mm |
| Moment of inertia, y-axis | Iy | 15.3 in⁴ | 6.37 ×10⁶ mm⁴ |
| Elastic section modulus, y-axis | Sy | 5.12 in³ | 83.9 ×10³ mm³ |
| Plastic section modulus, y-axis | Zy | 8.06 in³ | 132 ×10³ mm³ |
| Radius of gyration, y-axis | ry | 1.22 in | 31 mm |
| Torsional constant | J | 0.506 in⁴ | 211 ×10³ mm⁴ |
| Warping constant | Cw | 1,140 in⁶ | 306 ×10⁹ mm⁶ |
| Effective radius of gyration | rts | 1.51 in | 38.4 mm |
| Distance between flange centroids | ho | 17.3 in | 439 mm |
| Flange slenderness | bf/2tf | 7.06 | 7.06 |
| Web slenderness | h/tw | 53.5 | 53.5 |
W18x35 Weight Calculator
Enter a length to get the total weight of a W18x35 beam. A 20 ft length weighs 700 lb.
Uses the AISC nominal weight: 35 lb/ft (52 kg/m).
Beams Similar to W18x35
| Shape | Weight (lb/ft) | Depth (in) | Flange width (in) |
|---|---|---|---|
| W18x40 | 40 | 17.9 | 6.02 |
| W18x46 | 46 | 18.1 | 6.06 |
| W18x50 | 50 | 18 | 7.5 |
See every W18 size in the W18 beam sizes chart, or compare all shapes in the wide flange beam sizes chart.
W18x35 FAQ
What does W18x35 mean?
W means wide flange. The first number (18) is the nominal depth in inches, and the second number (35) is the weight in pounds per foot. The actual depth of W18x35 is 17.7 in. How to read steel beam sizes.
How much does a W18x35 beam weigh?
W18x35 weighs 35 lb per foot (52 kg per meter). A 20 ft beam weighs about 700 lb. Use the calculator above for any length.
What is the metric equivalent of W18x35?
The metric (SI) designation is W460x52: 450 mm deep with a 152 mm flange and 52 kg/m.
How far can a W18x35 beam span?
Span depends on the load, support conditions, deflection limits and local building code, so it cannot be read from a size table. A licensed structural engineer must size any beam that carries a load.
Source: AISC Shapes Database v16.0, consistent with the AISC Steel Construction Manual, 16th Edition. Last updated: September 2026.
This page is reference information only and is not engineering advice. Do not use it for a specific design without verification by a licensed engineer or architect. Full disclaimer.