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UB 686x254x140

Production class: hot rolled (EN 10365)

Section geometry

UB shape
Height (h):
683.5mm
Width (b):
253.7mm
Web thickness (tw):
12.4mm
Flange thickness (tf):
19mm
Radius (r):
20mm

Section properties

Moment of inertia (I):mm⁴
Y-axis:
1.377E9
Z-axis:
5.185E7
Elastic section modulus (Wel):mm³
Y-axis:
4.029E6
Z-axis:
4.087E5
Plastic section modulus (Wpl):mm³
Y-axis:
4.604E6
Z-axis:
6.399E5
Radius of gyration (i):mm
Y-axis:
276
Z-axis:
53
Plastic shear area (Av):mm²
Y-axis:
9641
Z-axis:
9343
Weight per meter:
140kg/m
Area (A):
17840mm²
Surface area per meter:
2.323m²/m
Torsion constant (It):
1.787E6mm⁴
Warping constant (Iw):
5.708E12mm⁶

Profile overview for UB 686x254x140

The UB 686x254x140 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 683.5 mm and a flange width (b) of 253.7 mm, supported by a 12.4 mm thick web and 19 mm thick flanges. With a cross-sectional area of 17840 mm² and a linear mass of 140 kg/m, the UB 686x254x140 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 1377200000 mm⁴ governs major deflection and serviceability limits. To calculate the ultimate bending resistance, engineers may utilize the strong-axis plastic section modulus of 4604000 mm³. For lateral stability and column buckling verifications, the weak-axis moment of inertia (Iz) provides 51850000 mm⁴ of lateral stiffness.

Advanced analysis: For complex load cases, the UB 686x254x140 provides a y-axis shear area (at strong bending axis) of 9640.6 mm² for web shear verification and a torsion constant of 1787000 mm⁴ for calculating rotational twist under eccentric loading. Additionally, a warping constant of 5708000000000 mm⁶ is available for rigorous lateral-torsional buckling (LTB) checks.