W6x25 is a wide flange steel beam that is 6.38 in deep with a 6.08 in flange and weighs 25 lb/ft (37.1 kg/m). Its metric designation is W150x37.1. All values below come from the AISC Shapes Database v16.0.
W6x25 Dimensions
| Property | Symbol | Imperial | Metric |
|---|---|---|---|
| Nominal weight | W | 25 lb/ft | 37.1 kg/m |
| Cross-sectional area | A | 7.34 in² | 4,740 mm² |
| Depth | d | 6.38 in | 162 mm |
| Flange width | bf | 6.08 in | 154 mm |
| Web thickness | tw | 0.32 in | 8.13 mm |
| Flange thickness | tf | 0.455 in | 11.6 mm |
| Distance to web toe of fillet (design) | kdes | 0.705 in | 17.9 mm |
| Distance to web toe of fillet (detailing) | kdet | 0.9375 in | 23.8 mm |
| Web center line to flange toe of fillet | k1 | 0.5625 in | 14.3 mm |
| Distance between web toes of fillets | T | 4.5 in | 114 mm |
| Workable gage (inner holes) | WGi | 3.5 in | 88.9 mm |
W6x25 Section Properties
| Property | Symbol | Imperial | Metric |
|---|---|---|---|
| Moment of inertia, x-axis | Ix | 53.4 in⁴ | 22.2 ×10⁶ mm⁴ |
| Elastic section modulus, x-axis | Sx | 16.7 in³ | 274 ×10³ mm³ |
| Plastic section modulus, x-axis | Zx | 18.9 in³ | 310 ×10³ mm³ |
| Radius of gyration, x-axis | rx | 2.7 in | 68.6 mm |
| Moment of inertia, y-axis | Iy | 17.1 in⁴ | 7.12 ×10⁶ mm⁴ |
| Elastic section modulus, y-axis | Sy | 5.61 in³ | 91.9 ×10³ mm³ |
| Plastic section modulus, y-axis | Zy | 8.56 in³ | 140 ×10³ mm³ |
| Radius of gyration, y-axis | ry | 1.52 in | 38.6 mm |
| Torsional constant | J | 0.461 in⁴ | 192 ×10³ mm⁴ |
| Warping constant | Cw | 150 in⁶ | 40.3 ×10⁹ mm⁶ |
| Effective radius of gyration | rts | 1.74 in | 44.2 mm |
| Distance between flange centroids | ho | 5.93 in | 151 mm |
| Flange slenderness | bf/2tf | 6.68 | 6.68 |
| Web slenderness | h/tw | 15.5 | 15.5 |
W6x25 Weight Calculator
Enter a length to get the total weight of a W6x25 beam. A 20 ft length weighs 500 lb.
Uses the AISC nominal weight: 25 lb/ft (37.1 kg/m).
Beams Similar to W6x25
See every W6 size in the W6 beam sizes chart, or compare all shapes in the wide flange beam sizes chart. Working in millimetres? W6x25 is listed as W150x37.1 in the metric wide flange beam sizes chart.
W6x25 FAQ
What does W6x25 mean?
W means wide flange. The first number (6) is the nominal depth in inches, and the second number (25) is the weight in pounds per foot. The actual depth of W6x25 is 6.38 in. How to read steel beam sizes.
How much does a W6x25 beam weigh?
W6x25 weighs 25 lb per foot (37.1 kg per meter). A 20 ft beam weighs about 500 lb. Use the calculator above for any length.
What is the metric equivalent of W6x25?
The metric (SI) designation is W150x37.1: 162 mm deep with a 154 mm flange and 37.1 kg/m.
How far can a W6x25 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.