W4x13 is a wide flange steel beam that is 4.16 in deep with a 4.06 in flange and weighs 13 lb/ft (19.3 kg/m). Its metric designation is W100x19.3. All values below come from the AISC Shapes Database v16.0.
W4x13 Dimensions
| Property | Symbol | Imperial | Metric |
|---|---|---|---|
| Nominal weight | W | 13 lb/ft | 19.3 kg/m |
| Cross-sectional area | A | 3.83 in² | 2,470 mm² |
| Depth | d | 4.16 in | 106 mm |
| Flange width | bf | 4.06 in | 103 mm |
| Web thickness | tw | 0.28 in | 7.11 mm |
| Flange thickness | tf | 0.345 in | 8.76 mm |
| Distance to web toe of fillet (design) | kdes | 0.595 in | 15.1 mm |
| Distance to web toe of fillet (detailing) | kdet | 0.75 in | 19.1 mm |
| Web center line to flange toe of fillet | k1 | 0.5 in | 12.7 mm |
| Distance between web toes of fillets | T | 2.625 in | 66.7 mm |
| Workable gage (inner holes) | WGi | 2.25 in | 57.2 mm |
W4x13 Section Properties
| Property | Symbol | Imperial | Metric |
|---|---|---|---|
| Moment of inertia, x-axis | Ix | 11.3 in⁴ | 4.7 ×10⁶ mm⁴ |
| Elastic section modulus, x-axis | Sx | 5.46 in³ | 89.5 ×10³ mm³ |
| Plastic section modulus, x-axis | Zx | 6.28 in³ | 103 ×10³ mm³ |
| Radius of gyration, x-axis | rx | 1.72 in | 43.7 mm |
| Moment of inertia, y-axis | Iy | 3.86 in⁴ | 1.61 ×10⁶ mm⁴ |
| Elastic section modulus, y-axis | Sy | 1.9 in³ | 31.1 ×10³ mm³ |
| Plastic section modulus, y-axis | Zy | 2.92 in³ | 47.9 ×10³ mm³ |
| Radius of gyration, y-axis | ry | 1 in | 25.4 mm |
| Torsional constant | J | 0.151 in⁴ | 62.9 ×10³ mm⁴ |
| Warping constant | Cw | 14 in⁶ | 3.76 ×10⁹ mm⁶ |
| Effective radius of gyration | rts | 1.16 in | 29.5 mm |
| Distance between flange centroids | ho | 3.82 in | 97 mm |
| Flange slenderness | bf/2tf | 5.88 | 5.88 |
| Web slenderness | h/tw | 10.6 | 10.6 |
W4x13 Weight Calculator
Enter a length to get the total weight of a W4x13 beam. A 20 ft length weighs 260 lb.
Uses the AISC nominal weight: 13 lb/ft (19.3 kg/m).
Beams Similar to W4x13
| Shape | Weight (lb/ft) | Depth (in) | Flange width (in) |
|---|---|---|---|
| W5x16 | 16 | 5.01 | 5 |
| W5x19 | 19 | 5.15 | 5.03 |
| W6x12 | 12 | 6.03 | 4 |
See every W4 size in the W4 beam sizes chart, or compare all shapes in the wide flange beam sizes chart. Working in millimetres? W4x13 is listed as W100x19.3 in the metric wide flange beam sizes chart.
W4x13 FAQ
What does W4x13 mean?
W means wide flange. The first number (4) is the nominal depth in inches, and the second number (13) is the weight in pounds per foot. The actual depth of W4x13 is 4.16 in. How to read steel beam sizes.
How much does a W4x13 beam weigh?
W4x13 weighs 13 lb per foot (19.3 kg per meter). A 20 ft beam weighs about 260 lb. Use the calculator above for any length.
What is the metric equivalent of W4x13?
The metric (SI) designation is W100x19.3: 106 mm deep with a 103 mm flange and 19.3 kg/m.
How far can a W4x13 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.