UB 686 x 254 x 125 is one of the Universal beams (UB) of the British library (british i beams for bending): 677.9 mm deep and 253 mm wide, web 11.7 mm, flanges 16.2 mm, 125.2 kg/m, area 159.5 cm².
| Dimension | Value | Description |
|---|---|---|
| h | 677.9 mm | Overall depth |
| b | 253 mm | Overall width (flange width, or leg length) |
| tw | 11.7 mm | Web thickness |
| tf | 16.2 mm | Flange thickness |
| r1 | 15.2 mm | Root radius (fillet between flange and web), or external corner radius for hollow sections |
| hi | 645.5 mm | Internal depth between flanges |
| d | 615.1 mm | Depth of the straight portion of the web between fillets |
| ss | 61.91 mm | Stiff bearing length |
| G | 125.2 kg/m | Mass per metre |
| A | 159.5 cm² | Cross-sectional area |
| AL | 2.318 m²/m | Painting surface per metre |
| AG | 18.52 m²/t | Painting surface per tonne |
Section properties
The structural properties of UB 686 x 254 x 125 are available in the Steel Profiles app with the British library:
- Iy, Wel,y, Wpl,y, iy
- Avz shear area
- Iz, Wel,z, Wpl,z, iz
- IT and Iw
- Maximum bolt size and flange gauges
- EN 1993-1-1 class for S235, S355 and S460
The app also runs design checks to EN 1993-1-1 on UB 686 x 254 x 125, finds the closest sections in the AISC, European, Canadian and Australian standards and compares it side by side with any other section.
Full properties in Steel Profiles
The free app shows UB 686 x 254 x 125 with its dimensions and drawing on iPhone, iPad and Mac. The British 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.