W16x45 is a wide flange steel beam that is 16.1 in deep with a 7.04 in flange and weighs 45 lb/ft (67 kg/m). Its metric designation is W410x67. All values below come from the AISC Shapes Database v16.0.
W16x45 Dimensions
| Property | Symbol | Imperial | Metric |
|---|---|---|---|
| Nominal weight | W | 45 lb/ft | 67 kg/m |
| Cross-sectional area | A | 13.3 in² | 8,580 mm² |
| Depth | d | 16.1 in | 409 mm |
| Flange width | bf | 7.04 in | 179 mm |
| Web thickness | tw | 0.345 in | 8.76 mm |
| Flange thickness | tf | 0.565 in | 14.4 mm |
| Distance to web toe of fillet (design) | kdes | 0.967 in | 24.6 mm |
| Distance to web toe of fillet (detailing) | kdet | 1.25 in | 31.8 mm |
| Web center line to flange toe of fillet | k1 | 0.8125 in | 20.6 mm |
| Distance between web toes of fillets | T | 13.625 in | 346 mm |
| Workable gage (inner holes) | WGi | 3.5 in | 88.9 mm |
W16x45 Section Properties
| Property | Symbol | Imperial | Metric |
|---|---|---|---|
| Moment of inertia, x-axis | Ix | 586 in⁴ | 244 ×10⁶ mm⁴ |
| Elastic section modulus, x-axis | Sx | 72.7 in³ | 1,190 ×10³ mm³ |
| Plastic section modulus, x-axis | Zx | 82.3 in³ | 1,350 ×10³ mm³ |
| Radius of gyration, x-axis | rx | 6.65 in | 169 mm |
| Moment of inertia, y-axis | Iy | 32.8 in⁴ | 13.7 ×10⁶ mm⁴ |
| Elastic section modulus, y-axis | Sy | 9.34 in³ | 153 ×10³ mm³ |
| Plastic section modulus, y-axis | Zy | 14.5 in³ | 238 ×10³ mm³ |
| Radius of gyration, y-axis | ry | 1.57 in | 39.9 mm |
| Torsional constant | J | 1.11 in⁴ | 462 ×10³ mm⁴ |
| Warping constant | Cw | 1,990 in⁶ | 534 ×10⁹ mm⁶ |
| Effective radius of gyration | rts | 1.87 in | 47.5 mm |
| Distance between flange centroids | ho | 15.5 in | 394 mm |
| Flange slenderness | bf/2tf | 6.23 | 6.23 |
| Web slenderness | h/tw | 41.1 | 41.1 |
W16x45 Weight Calculator
Enter a length to get the total weight of a W16x45 beam. A 20 ft length weighs 900 lb.
Uses the AISC nominal weight: 45 lb/ft (67 kg/m).
Beams Similar to W16x45
See every W16 size in the W16 beam sizes chart, or compare all shapes in the wide flange beam sizes chart. Working in millimetres? W16x45 is listed as W410x67 in the metric wide flange beam sizes chart.
W16x45 FAQ
What does W16x45 mean?
W means wide flange. The first number (16) is the nominal depth in inches, and the second number (45) is the weight in pounds per foot. The actual depth of W16x45 is 16.1 in. How to read steel beam sizes.
How much does a W16x45 beam weigh?
W16x45 weighs 45 lb per foot (67 kg per meter). A 20 ft beam weighs about 900 lb. Use the calculator above for any length.
What is the metric equivalent of W16x45?
The metric (SI) designation is W410x67: 409 mm deep with a 179 mm flange and 67 kg/m.
How far can a W16x45 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.