W8x24 is a wide flange steel beam that is 7.93 in deep with a 6.5 in flange and weighs 24 lb/ft (35.9 kg/m). Its metric designation is W200x35.9. All values below come from the AISC Shapes Database v16.0.
W8x24 Dimensions
| Property | Symbol | Imperial | Metric |
|---|---|---|---|
| Nominal weight | W | 24 lb/ft | 35.9 kg/m |
| Cross-sectional area | A | 7.08 in² | 4,570 mm² |
| Depth | d | 7.93 in | 201 mm |
| Flange width | bf | 6.5 in | 165 mm |
| Web thickness | tw | 0.245 in | 6.22 mm |
| Flange thickness | tf | 0.4 in | 10.2 mm |
| Distance to web toe of fillet (design) | kdes | 0.794 in | 20.2 mm |
| Distance to web toe of fillet (detailing) | kdet | 0.875 in | 22.2 mm |
| Web center line to flange toe of fillet | k1 | 0.5625 in | 14.3 mm |
| Distance between web toes of fillets | T | 6.125 in | 156 mm |
| Workable gage (inner holes) | WGi | 4 in | 102 mm |
W8x24 Section Properties
| Property | Symbol | Imperial | Metric |
|---|---|---|---|
| Moment of inertia, x-axis | Ix | 82.7 in⁴ | 34.4 ×10⁶ mm⁴ |
| Elastic section modulus, x-axis | Sx | 20.9 in³ | 342 ×10³ mm³ |
| Plastic section modulus, x-axis | Zx | 23.1 in³ | 379 ×10³ mm³ |
| Radius of gyration, x-axis | rx | 3.42 in | 86.9 mm |
| Moment of inertia, y-axis | Iy | 18.3 in⁴ | 7.62 ×10⁶ mm⁴ |
| Elastic section modulus, y-axis | Sy | 5.63 in³ | 92.3 ×10³ mm³ |
| Plastic section modulus, y-axis | Zy | 8.57 in³ | 140 ×10³ mm³ |
| Radius of gyration, y-axis | ry | 1.61 in | 40.9 mm |
| Torsional constant | J | 0.346 in⁴ | 144 ×10³ mm⁴ |
| Warping constant | Cw | 259 in⁶ | 69.6 ×10⁹ mm⁶ |
| Effective radius of gyration | rts | 1.81 in | 46 mm |
| Distance between flange centroids | ho | 7.53 in | 191 mm |
| Flange slenderness | bf/2tf | 8.12 | 8.12 |
| Web slenderness | h/tw | 25.9 | 25.9 |
W8x24 Weight Calculator
Enter a length to get the total weight of a W8x24 beam. A 20 ft length weighs 480 lb.
Uses the AISC nominal weight: 24 lb/ft (35.9 kg/m).
Beams Similar to W8x24
See every W8 size in the W8 beam sizes chart, or compare all shapes in the wide flange beam sizes chart. Working in millimetres? W8x24 is listed as W200x35.9 in the metric wide flange beam sizes chart.
W8x24 FAQ
What does W8x24 mean?
W means wide flange. The first number (8) is the nominal depth in inches, and the second number (24) is the weight in pounds per foot. The actual depth of W8x24 is 7.93 in. How to read steel beam sizes.
How much does a W8x24 beam weigh?
W8x24 weighs 24 lb per foot (35.9 kg per meter). A 20 ft beam weighs about 480 lb. Use the calculator above for any length.
What is the metric equivalent of W8x24?
The metric (SI) designation is W200x35.9: 201 mm deep with a 165 mm flange and 35.9 kg/m.
How far can a W8x24 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.