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UB 686x254x125

Production class: hot rolled (EN 10365)

Section geometry

UB shape
Height (h):
677.9mm
Width (b):
253mm
Web thickness (tw):
11.7mm
Flange thickness (tf):
16.2mm
Radius (r):
20mm

Section properties

Moment of inertia (I):mm⁴
Y-axis:
1.194E9
Z-axis:
4.385E7
Elastic section modulus (Wel):mm³
Y-axis:
3.524E6
Z-axis:
3.466E5
Plastic section modulus (Wpl):mm³
Y-axis:
4.040E6
Z-axis:
5.441E5
Radius of gyration (i):mm
Y-axis:
272
Z-axis:
52
Plastic shear area (Av):mm²
Y-axis:
8197
Z-axis:
8733
Weight per meter:
125kg/m
Area (A):
15950mm²
Surface area per meter:
2.31m²/m
Torsion constant (It):
1.243E6mm⁴
Warping constant (Iw):
4.786E12mm⁶

Profile overview for UB 686x254x125

The UB 686x254x125 is a structural steel cross-section utilized in commercial construction, industrial framing, and mechanical engineering. Manufactured as a hot rolled section, it complies with EN 10365 dimensional standards, ensuring predictability in detailing and fabrication.Access to its exact geometric and statical properties is essential for 3D modeling and structural verification.

Geometry: This open profile features a total depth (h) of 677.9 mm and a flange width (b) of 253 mm, supported by a 11.7 mm thick web and 16.2 mm thick flanges. With a cross-sectional area of 15950 mm² and a linear mass of 125 kg/m, the UB 686x254x125 offers a distinct stiffness-to-weight ratio for both column (axial) and beam applications.

Section properties: For design of bending, the major and minor axis properties dictate the member's structural capacity. The strong-axis moment of inertia (Iy) of 1194400000 mm⁴ governs major deflection and serviceability limits. To calculate the ultimate bending resistance, engineers may utilize the strong-axis plastic section modulus of 4040000 mm³. For lateral stability and column buckling verifications, the weak-axis moment of inertia (Iz) provides 43850000 mm⁴ of lateral stiffness.

Advanced analysis: For complex load cases, the UB 686x254x125 provides a y-axis shear area (at strong bending axis) of 8197.2 mm² for web shear verification and a torsion constant of 1243000 mm⁴ for calculating rotational twist under eccentric loading. Additionally, a warping constant of 4786000000000 mm⁶ is available for rigorous lateral-torsional buckling (LTB) checks.