356x171 UB — Sizes, Dimensions & Properties

4 sizes in the 356x171 serial size group. All dimensions in mm, section properties in cm units.

Designation	Mass (kg/m)	h (mm)	b (mm)	tw (mm)	tf (mm)	A (cm2)	Ixx (cm4)	Iyy (cm4)	Zxx (cm3)	Sxx (cm3)	rxx (cm)	ryy (cm)
356x171x67	67.1	363.4	173.2	9.1	15.7	85.5	19,500	1,360	1,070	1,210	15.1	3.99
356x171x57	57	358	172.2	8.1	13	72.6	16,000	1,110	896	1,010	14.9	3.91
356x171x51	51	355	171.5	7.4	11.5	64.9	14,100	968	796	896	14.8	3.86
356x171x45	45	351.4	171.1	7	9.7	57.3	12,100	811	687	775	14.5	3.76

356x171x67 UB

Designation: 356x171x67
Serial Size: 356x171
Mass per Metre: 67.1 kg/m
Depth of Section (h): 363.4 mm
Width of Section (b): 173.2 mm
Web Thickness (tw): 9.1 mm
Flange Thickness (tf): 15.7 mm
Root Radius (r): 10.2 mm
Depth Between Fillets (d): 311.6 mm
Local Buckling Ratio d/tw: 34.2
Local Buckling Ratio cf/tf: 5.52
Second Moment of Area Ixx: 19,500 cm4
Second Moment of Area Iyy: 1,360 cm4
Elastic Modulus Zxx: 1,070 cm3
Elastic Modulus Zyy: 157 cm3
Plastic Modulus Sxx: 1,210 cm3
Plastic Modulus Syy: 243 cm3
Radius of Gyration rxx: 15.1 cm
Radius of Gyration ryy: 3.99 cm
Cross-Sectional Area: 85.5 cm2
Buckling Parameter (u): 0.886
Torsional Index (x): 24.4
Warping Constant (Iw): 0.412 dm6
Torsional Constant (It): 55.7 cm4
Surface Area per Metre: 1.38 m2/m
Surface Area per Tonne: 20.6 m2/t

356x171x57 UB

Designation: 356x171x57
Serial Size: 356x171
Mass per Metre: 57 kg/m
Depth of Section (h): 358 mm
Width of Section (b): 172.2 mm
Web Thickness (tw): 8.1 mm
Flange Thickness (tf): 13 mm
Root Radius (r): 10.2 mm
Depth Between Fillets (d): 311.6 mm
Local Buckling Ratio d/tw: 38.5
Local Buckling Ratio cf/tf: 6.62
Second Moment of Area Ixx: 16,000 cm4
Second Moment of Area Iyy: 1,110 cm4
Elastic Modulus Zxx: 896 cm3
Elastic Modulus Zyy: 129 cm3
Plastic Modulus Sxx: 1,010 cm3
Plastic Modulus Syy: 199 cm3
Radius of Gyration rxx: 14.9 cm
Radius of Gyration ryy: 3.91 cm
Cross-Sectional Area: 72.6 cm2
Buckling Parameter (u): 0.882
Torsional Index (x): 28.8
Warping Constant (Iw): 0.33 dm6
Torsional Constant (It): 33.4 cm4
Surface Area per Metre: 1.37 m2/m
Surface Area per Tonne: 24.1 m2/t

356x171x51 UB

Designation: 356x171x51
Serial Size: 356x171
Mass per Metre: 51 kg/m
Depth of Section (h): 355 mm
Width of Section (b): 171.5 mm
Web Thickness (tw): 7.4 mm
Flange Thickness (tf): 11.5 mm
Root Radius (r): 10.2 mm
Depth Between Fillets (d): 311.6 mm
Local Buckling Ratio d/tw: 42.1
Local Buckling Ratio cf/tf: 7.46
Second Moment of Area Ixx: 14,100 cm4
Second Moment of Area Iyy: 968 cm4
Elastic Modulus Zxx: 796 cm3
Elastic Modulus Zyy: 113 cm3
Plastic Modulus Sxx: 896 cm3
Plastic Modulus Syy: 174 cm3
Radius of Gyration rxx: 14.8 cm
Radius of Gyration ryy: 3.86 cm
Cross-Sectional Area: 64.9 cm2
Buckling Parameter (u): 0.881
Torsional Index (x): 32.1
Warping Constant (Iw): 0.286 dm6
Torsional Constant (It): 23.8 cm4
Surface Area per Metre: 1.36 m2/m
Surface Area per Tonne: 26.7 m2/t

356x171x45 UB

Designation: 356x171x45
Serial Size: 356x171
Mass per Metre: 45 kg/m
Depth of Section (h): 351.4 mm
Width of Section (b): 171.1 mm
Web Thickness (tw): 7 mm
Flange Thickness (tf): 9.7 mm
Root Radius (r): 10.2 mm
Depth Between Fillets (d): 311.6 mm
Local Buckling Ratio d/tw: 44.5
Local Buckling Ratio cf/tf: 8.82
Second Moment of Area Ixx: 12,100 cm4
Second Moment of Area Iyy: 811 cm4
Elastic Modulus Zxx: 687 cm3
Elastic Modulus Zyy: 94.8 cm3
Plastic Modulus Sxx: 775 cm3
Plastic Modulus Syy: 147 cm3
Radius of Gyration rxx: 14.5 cm
Radius of Gyration ryy: 3.76 cm
Cross-Sectional Area: 57.3 cm2
Buckling Parameter (u): 0.874
Torsional Index (x): 36.8
Warping Constant (Iw): 0.237 dm6
Torsional Constant (It): 15.8 cm4
Surface Area per Metre: 1.36 m2/m
Surface Area per Tonne: 30.2 m2/t

356x171 UB — Overview

The 356x171 serial size group contains 4 sections, ranging from 45 kg/m to 67.1 kg/m. All sections in this group share the same nominal depth and width but differ in web and flange thickness, which affects the weight and structural capacity.

Section properties are sourced from the Tata Steel Blue Book / SCI P363. For structural design to BS EN 1993-1-1 (Eurocode 3), use these properties with the appropriate partial factors from the UK National Annex.

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Section properties from Tata Steel Blue Book / SCI P363 / BS 4-1:2005.