W12x19 is a wide flange steel beam that is 12.2 in deep with a 4.01 in flange and weighs 19 lb/ft (28.3 kg/m). Its metric designation is W310x28.3. All values below come from the AISC Shapes Database v16.0.
W12x19 Dimensions
| Property | Symbol | Imperial | Metric |
|---|---|---|---|
| Nominal weight | W | 19 lb/ft | 28.3 kg/m |
| Cross-sectional area | A | 5.57 in² | 3,590 mm² |
| Depth | d | 12.2 in | 310 mm |
| Flange width | bf | 4.01 in | 102 mm |
| Web thickness | tw | 0.235 in | 5.97 mm |
| Flange thickness | tf | 0.35 in | 8.89 mm |
| Distance to web toe of fillet (design) | kdes | 0.65 in | 16.5 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 | 10.375 in | 264 mm |
| Workable gage (inner holes) | WGi | 2.25 in | 57.2 mm |
W12x19 Section Properties
| Property | Symbol | Imperial | Metric |
|---|---|---|---|
| Moment of inertia, x-axis | Ix | 130 in⁴ | 54.1 ×10⁶ mm⁴ |
| Elastic section modulus, x-axis | Sx | 21.3 in³ | 349 ×10³ mm³ |
| Plastic section modulus, x-axis | Zx | 24.7 in³ | 405 ×10³ mm³ |
| Radius of gyration, x-axis | rx | 4.82 in | 122 mm |
| Moment of inertia, y-axis | Iy | 3.76 in⁴ | 1.57 ×10⁶ mm⁴ |
| Elastic section modulus, y-axis | Sy | 1.88 in³ | 30.8 ×10³ mm³ |
| Plastic section modulus, y-axis | Zy | 2.98 in³ | 48.8 ×10³ mm³ |
| Radius of gyration, y-axis | ry | 0.822 in | 20.9 mm |
| Torsional constant | J | 0.18 in⁴ | 74.9 ×10³ mm⁴ |
| Warping constant | Cw | 131 in⁶ | 35.2 ×10⁹ mm⁶ |
| Effective radius of gyration | rts | 1.02 in | 25.9 mm |
| Distance between flange centroids | ho | 11.9 in | 302 mm |
| Flange slenderness | bf/2tf | 5.72 | 5.72 |
| Web slenderness | h/tw | 46.2 | 46.2 |
W12x19 Weight Calculator
Enter a length to get the total weight of a W12x19 beam. A 20 ft length weighs 380 lb.
Uses the AISC nominal weight: 19 lb/ft (28.3 kg/m).
Beams Similar to W12x19
| Shape | Weight (lb/ft) | Depth (in) | Flange width (in) |
|---|---|---|---|
| W12x22 | 22 | 12.3 | 4.03 |
| W12x16 | 16 | 12 | 3.99 |
| W12x14 | 14 | 11.9 | 3.97 |
See every W12 size in the W12 beam sizes chart, or compare all shapes in the wide flange beam sizes chart. Working in millimetres? W12x19 is listed as W310x28.3 in the metric wide flange beam sizes chart.
W12x19 FAQ
What does W12x19 mean?
W means wide flange. The first number (12) is the nominal depth in inches, and the second number (19) is the weight in pounds per foot. The actual depth of W12x19 is 12.2 in. How to read steel beam sizes.
How much does a W12x19 beam weigh?
W12x19 weighs 19 lb per foot (28.3 kg per meter). A 20 ft beam weighs about 380 lb. Use the calculator above for any length.
What is the metric equivalent of W12x19?
The metric (SI) designation is W310x28.3: 310 mm deep with a 102 mm flange and 28.3 kg/m.
How far can a W12x19 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.