W18 Beam Sizes and Section Properties
Compare AISC W18 wide-flange sections by weight, actual depth, flange width, moment of inertia and section modulus.
Steel Section Finder
Search or browse standard steel sections.
Showing AISC · W18 · Imperial
AISC Shapes Database v16.0 · 2,299 sections
Searches every available library and shape family. Leave the field empty to browse the filters below.
Filter by series
Showing the most relevant 75 sections.
| Designation | Weight (lb/ft) | Depth, d (in) | Flange width, bf (in) | Area (in²) | Ix (in⁴) | Sx (in³) |
|---|---|---|---|---|---|---|
| W18x311 | 311 | 22.3 | 12 | 91.6 | 6970 | 624 |
| W18x283 | 283 | 21.9 | 11.9 | 83.3 | 6170 | 565 |
| W18x258 | 258 | 21.5 | 11.8 | 76 | 5510 | 514 |
| W18x234 | 234 | 21.1 | 11.7 | 68.6 | 4900 | 466 |
| W18x211 | 211 | 20.7 | 11.6 | 62.3 | 4330 | 419 |
| W18x192 | 192 | 20.4 | 11.5 | 56.2 | 3870 | 380 |
| W18x175 | 175 | 20 | 11.4 | 51.4 | 3450 | 344 |
| W18x158 | 158 | 19.7 | 11.3 | 46.3 | 3060 | 310 |
| W18x143 | 143 | 19.5 | 11.2 | 42 | 2750 | 282 |
| W18x130 | 130 | 19.3 | 11.2 | 38.3 | 2460 | 256 |
| W18x119 | 119 | 19 | 11.3 | 35.1 | 2190 | 231 |
| W18x106 | 106 | 18.7 | 11.2 | 31.1 | 1910 | 204 |
| W18x97 | 97 | 18.6 | 11.1 | 28.5 | 1750 | 188 |
| W18x71 | 71 | 18.5 | 7.64 | 20.9 | 1170 | 127 |
| W18x65 | 65 | 18.4 | 7.59 | 19.1 | 1070 | 117 |
| W18x86 | 86 | 18.4 | 11.1 | 25.3 | 1530 | 166 |
| W18x60 | 60 | 18.2 | 7.56 | 17.6 | 984 | 108 |
| W18x76 | 76 | 18.2 | 11 | 22.3 | 1330 | 146 |
| W18x46 | 46 | 18.1 | 6.06 | 13.5 | 712 | 78.8 |
| W18x55 | 55 | 18.1 | 7.53 | 16.2 | 890 | 98.3 |
| W18x50 | 50 | 18 | 7.5 | 14.7 | 800 | 88.9 |
| W18x40 | 40 | 17.9 | 6.02 | 11.8 | 612 | 68.4 |
| W18x35 | 35 | 17.7 | 6 | 10.3 | 510 | 57.6 |
Series overview
W18 series
The W18 series groups AISC W-family shapes that share the same nominal-depth designation prefix. Weights and actual depths still vary within the series, so use the table below to compare candidates before analysis.
The AISC W18 series contains 23 published sections ranging from 35.00 to 311.00 lb/ft . Actual depths range from 17.70 to 22.30 inches, despite the shared W18 nominal designation .
- Lightest W18
- W18X35
- Highest Ix
- W18X311
- Shallowest actual depth
- W18X35
- Widest flange
- W18X311
Beam calculator
Analyze a W18 section
Select a designation above and load it into Optimal Beam for span, support and load analysis.
Source: AISC Shapes Database v16.0 · Methodology
Questions & answers
W18 FAQs
What is the W18 series?
It is the set of published AISC W shapes whose designation begins with W18. Members share a nominal-depth label but can differ in weight, actual depth and properties.
Why do actual depths differ within W18?
The number in the designation is nominal. Published overall depth varies by weight. Always use the tabulated depth for clearance and detailing.
How should I choose among W18 weights?
Compare weight, Ix, Sx, flange geometry and project constraints, then analyze finalists under the same span and loads. There is no universal “best” section.
Can I analyze a W18 section in Optimal Beam?
Yes. Select a designation above and choose Analyze to load its properties into the beam calculator.