U 40 x 20 x 4 is one of the Small U channels of the European library (small tapered flange channels): 40 mm deep and 20 mm wide, web 4 mm, flanges 5.5 mm, 2.65 kg/m, area 3.38 cm².
| Dimension | Value | Description |
|---|---|---|
| h | 40 mm | Overall depth |
| b | 20 mm | Overall width (flange width, or leg length) |
| tw | 4 mm | Web thickness |
| tf | 5.5 mm | Flange thickness |
| r1 | 5 mm | Root radius (fillet between flange and web), or external corner radius for hollow sections |
| r2 | 2.5 mm | Toe radius of the flange, or internal corner radius for hollow sections |
| d | 18.8 mm | Depth of the straight portion of the web between fillets |
| x | 6.8 mm | Distance from the back of the web (or heel) to the centroid, horizontal |
| xm | 11.5 mm | Distance from the shear centre to the back of the web |
| ss | 12.5 mm | Stiff bearing length |
| G | 2.65 kg/m | Mass per metre |
| A | 3.38 cm² | Cross-sectional area |
| AL | 0.149 m²/m | Painting surface per metre |
| AG | 56.17 m²/t | Painting surface per tonne |
Section properties
The structural properties of U 40 x 20 x 4 are available in the Steel Profiles app with the European library:
- Iy, Wel,y, Wpl,y, iy
- Avz shear area
- Iz, Wel,z, Wpl,z, iz
- IT and Iw
- Maximum bolt size and edge distances
- EN 1993-1-1 class for S235, S355 and S460
The app also runs design checks to EN 1993-1-1 on U 40 x 20 x 4, finds the closest sections in the AISC, British, Canadian and Australian standards and compares it side by side with any other section.
Full properties in Steel Profiles
The free app shows U 40 x 20 x 4 with its dimensions and drawing on iPhone, iPad and Mac. The European library unlocks the complete structural properties, the design checks to Eurocode 3, the Equivalent Finder across standards and the comparison of up to three sections. Favorites, weight lists and saved sections sync through iCloud.