W30x108 is a wide flange steel beam that is 29.8 in deep with a 10.5 in flange and weighs 108 lb/ft (161 kg/m). Its metric designation is W760x161. All values below come from the AISC Shapes Database v16.0.
W30x108 Dimensions
| Property | Symbol | Imperial | Metric |
|---|---|---|---|
| Nominal weight | W | 108 lb/ft | 161 kg/m |
| Cross-sectional area | A | 31.7 in² | 20,500 mm² |
| Depth | d | 29.8 in | 757 mm |
| Flange width | bf | 10.5 in | 267 mm |
| Web thickness | tw | 0.545 in | 13.8 mm |
| Flange thickness | tf | 0.76 in | 19.3 mm |
| Distance to web toe of fillet (design) | kdes | 1.41 in | 35.8 mm |
| Distance to web toe of fillet (detailing) | kdet | 2 in | 50.8 mm |
| Web center line to flange toe of fillet | k1 | 1.5 in | 38.1 mm |
| Distance between web toes of fillets | T | 25.75 in | 654 mm |
| Workable gage (inner holes) | WGi | 5.5 in | 140 mm |
W30x108 Section Properties
| Property | Symbol | Imperial | Metric |
|---|---|---|---|
| Moment of inertia, x-axis | Ix | 4,470 in⁴ | 1,860 ×10⁶ mm⁴ |
| Elastic section modulus, x-axis | Sx | 299 in³ | 4,900 ×10³ mm³ |
| Plastic section modulus, x-axis | Zx | 346 in³ | 5,670 ×10³ mm³ |
| Radius of gyration, x-axis | rx | 11.9 in | 302 mm |
| Moment of inertia, y-axis | Iy | 146 in⁴ | 60.8 ×10⁶ mm⁴ |
| Elastic section modulus, y-axis | Sy | 27.9 in³ | 457 ×10³ mm³ |
| Plastic section modulus, y-axis | Zy | 43.9 in³ | 719 ×10³ mm³ |
| Radius of gyration, y-axis | ry | 2.15 in | 54.6 mm |
| Torsional constant | J | 4.99 in⁴ | 2,080 ×10³ mm⁴ |
| Warping constant | Cw | 30,900 in⁶ | 8,300 ×10⁹ mm⁶ |
| Effective radius of gyration | rts | 2.67 in | 67.8 mm |
| Distance between flange centroids | ho | 29 in | 737 mm |
| Flange slenderness | bf/2tf | 6.89 | 6.89 |
| Web slenderness | h/tw | 49.6 | 49.6 |
W30x108 Weight Calculator
Enter a length to get the total weight of a W30x108 beam. A 20 ft length weighs 2,160 lb.
Uses the AISC nominal weight: 108 lb/ft (161 kg/m).
Beams Similar to W30x108
| Shape | Weight (lb/ft) | Depth (in) | Flange width (in) |
|---|---|---|---|
| W30x116 | 116 | 30 | 10.5 |
| W30x99 | 99 | 29.7 | 10.5 |
| W30x124 | 124 | 30.2 | 10.5 |
Compare all W shapes in the wide flange beam sizes chart.
W30x108 FAQ
What does W30x108 mean?
W means wide flange. The first number (30) is the nominal depth in inches, and the second number (108) is the weight in pounds per foot. The actual depth of W30x108 is 29.8 in. How to read steel beam sizes.
How much does a W30x108 beam weigh?
W30x108 weighs 108 lb per foot (161 kg per meter). A 20 ft beam weighs about 2,160 lb. Use the calculator above for any length.
What is the metric equivalent of W30x108?
The metric (SI) designation is W760x161: 757 mm deep with a 267 mm flange and 161 kg/m.
How far can a W30x108 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.