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UB 686x254x170

Production class: hot rolled (EN 10365)

Section geometry

UB shape
Height (h):
692.9mm
Width (b):
255.8mm
Web thickness (tw):
14.5mm
Flange thickness (tf):
23.7mm
Radius (r):
20mm

Section properties

Moment of inertia (I):mm⁴
Y-axis:
1.718E9
Z-axis:
6.633E7
Elastic section modulus (Wel):mm³
Y-axis:
4.958E6
Z-axis:
5.186E5
Plastic section modulus (Wpl):mm³
Y-axis:
5.676E6
Z-axis:
8.133E5
Radius of gyration (i):mm
Y-axis:
280
Z-axis:
55
Plastic shear area (Av):mm²
Y-axis:
12120
Z-axis:
10990
Weight per meter:
170kg/m
Area (A):
21680mm²
Surface area per meter:
2.346m²/m
Torsion constant (It):
3.216E6mm⁴
Warping constant (Iw):
7.402E12mm⁶

Profile overview for UB 686x254x170

The UB 686x254x170 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 692.9 mm and a flange width (b) of 255.8 mm, supported by a 14.5 mm thick web and 23.7 mm thick flanges. With a cross-sectional area of 21680 mm² and a linear mass of 170 kg/m, the UB 686x254x170 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 1717800000 mm⁴ governs major deflection and serviceability limits. To calculate the ultimate bending resistance, engineers may utilize the strong-axis plastic section modulus of 5676000 mm³. For lateral stability and column buckling verifications, the weak-axis moment of inertia (Iz) provides 66330000 mm⁴ of lateral stiffness.

Advanced analysis: For complex load cases, the UB 686x254x170 provides a y-axis shear area (at strong bending axis) of 12124.92 mm² for web shear verification and a torsion constant of 3216000 mm⁴ for calculating rotational twist under eccentric loading. Additionally, a warping constant of 7402000000000 mm⁶ is available for rigorous lateral-torsional buckling (LTB) checks.