W18X35 Dimensions & Weight
W18X35 is an AISC wide-flange (W) shape with an actual depth of 17.7 in and a 6 in wide flange, weighing 35 lb per foot — a workhorse size for floor beams and roof framing on commercial jobs. It is the lightest of the 23 W18 sizes listed here.
W18X35 Dimensions
| Property | Imperial | Metric |
|---|---|---|
| Depth (d) | 17.7 in | 449.6 mm |
| Flange width (bf) | 6 in | 152.4 mm |
| Cross-section area (A) | 10.3 in² | 66.5 cm² |
| Weight | 35 lb/ft | 52.1 kg/m |
What does W18X35 cost?
At an example material price of $0.92/lb, W18X35 runs about $32.20 per foot, or roughly $644 for a 20-ft length.
Example pricing only. Actual steel pricing varies by region, grade, quantity, and market conditions — use your own supplier numbers for real bids.
Counting W18X35s off a drawing set by hand? SteelFlo finds every steel label on your PDF automatically — 3 takeoffs free.
Related sizes
Deeper reading: Wide-Flange Beam Sizes: The Complete Guide · How to calculate steel weight