406x178 UB — Sizes, Dimensions & Properties

5 sizes in the 406x178 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)
406x178x85	85.3	417.2	181.9	10.9	18.2	109	31,700	1,830	1,520	1,730	17.1	4.11
406x178x74	74.2	412.8	179.5	9.5	16	94.5	27,300	1,550	1,320	1,500	17	4.04
406x178x67	67.1	409.4	178.8	8.8	14.3	85.5	24,300	1,360	1,190	1,350	16.9	3.99
406x178x60	60.1	406.4	177.9	7.9	12.8	76.5	21,600	1,200	1,060	1,200	16.8	3.97
406x178x54	54.1	402.6	177.7	7.7	10.9	69	18,700	1,020	930	1,050	16.5	3.85

406x178x85 UB

Designation: 406x178x85
Serial Size: 406x178
Mass per Metre: 85.3 kg/m
Depth of Section (h): 417.2 mm
Width of Section (b): 181.9 mm
Web Thickness (tw): 10.9 mm
Flange Thickness (tf): 18.2 mm
Root Radius (r): 10.2 mm
Depth Between Fillets (d): 360.4 mm
Local Buckling Ratio d/tw: 33.1
Local Buckling Ratio cf/tf: 5
Second Moment of Area Ixx: 31,700 cm4
Second Moment of Area Iyy: 1,830 cm4
Elastic Modulus Zxx: 1,520 cm3
Elastic Modulus Zyy: 201 cm3
Plastic Modulus Sxx: 1,730 cm3
Plastic Modulus Syy: 313 cm3
Radius of Gyration rxx: 17.1 cm
Radius of Gyration ryy: 4.11 cm
Cross-Sectional Area: 109 cm2
Buckling Parameter (u): 0.881
Torsional Index (x): 24.4
Warping Constant (Iw): 0.728 dm6
Torsional Constant (It): 93 cm4
Surface Area per Metre: 1.52 m2/m
Surface Area per Tonne: 17.8 m2/t

406x178x74 UB

Designation: 406x178x74
Serial Size: 406x178
Mass per Metre: 74.2 kg/m
Depth of Section (h): 412.8 mm
Width of Section (b): 179.5 mm
Web Thickness (tw): 9.5 mm
Flange Thickness (tf): 16 mm
Root Radius (r): 10.2 mm
Depth Between Fillets (d): 360.4 mm
Local Buckling Ratio d/tw: 37.9
Local Buckling Ratio cf/tf: 5.61
Second Moment of Area Ixx: 27,300 cm4
Second Moment of Area Iyy: 1,550 cm4
Elastic Modulus Zxx: 1,320 cm3
Elastic Modulus Zyy: 172 cm3
Plastic Modulus Sxx: 1,500 cm3
Plastic Modulus Syy: 267 cm3
Radius of Gyration rxx: 17 cm
Radius of Gyration ryy: 4.04 cm
Cross-Sectional Area: 94.5 cm2
Buckling Parameter (u): 0.882
Torsional Index (x): 27.6
Warping Constant (Iw): 0.608 dm6
Torsional Constant (It): 62.8 cm4
Surface Area per Metre: 1.51 m2/m
Surface Area per Tonne: 20.4 m2/t

406x178x67 UB

Designation: 406x178x67
Serial Size: 406x178
Mass per Metre: 67.1 kg/m
Depth of Section (h): 409.4 mm
Width of Section (b): 178.8 mm
Web Thickness (tw): 8.8 mm
Flange Thickness (tf): 14.3 mm
Root Radius (r): 10.2 mm
Depth Between Fillets (d): 360.4 mm
Local Buckling Ratio d/tw: 41
Local Buckling Ratio cf/tf: 6.25
Second Moment of Area Ixx: 24,300 cm4
Second Moment of Area Iyy: 1,360 cm4
Elastic Modulus Zxx: 1,190 cm3
Elastic Modulus Zyy: 153 cm3
Plastic Modulus Sxx: 1,350 cm3
Plastic Modulus Syy: 237 cm3
Radius of Gyration rxx: 16.9 cm
Radius of Gyration ryy: 3.99 cm
Cross-Sectional Area: 85.5 cm2
Buckling Parameter (u): 0.88
Torsional Index (x): 30.5
Warping Constant (Iw): 0.533 dm6
Torsional Constant (It): 46.1 cm4
Surface Area per Metre: 1.5 m2/m
Surface Area per Tonne: 22.3 m2/t

406x178x60 UB

Designation: 406x178x60
Serial Size: 406x178
Mass per Metre: 60.1 kg/m
Depth of Section (h): 406.4 mm
Width of Section (b): 177.9 mm
Web Thickness (tw): 7.9 mm
Flange Thickness (tf): 12.8 mm
Root Radius (r): 10.2 mm
Depth Between Fillets (d): 360.4 mm
Local Buckling Ratio d/tw: 45.6
Local Buckling Ratio cf/tf: 6.95
Second Moment of Area Ixx: 21,600 cm4
Second Moment of Area Iyy: 1,200 cm4
Elastic Modulus Zxx: 1,060 cm3
Elastic Modulus Zyy: 135 cm3
Plastic Modulus Sxx: 1,200 cm3
Plastic Modulus Syy: 209 cm3
Radius of Gyration rxx: 16.8 cm
Radius of Gyration ryy: 3.97 cm
Cross-Sectional Area: 76.5 cm2
Buckling Parameter (u): 0.88
Torsional Index (x): 33.8
Warping Constant (Iw): 0.466 dm6
Torsional Constant (It): 33.3 cm4
Surface Area per Metre: 1.49 m2/m
Surface Area per Tonne: 24.8 m2/t

406x178x54 UB

Designation: 406x178x54
Serial Size: 406x178
Mass per Metre: 54.1 kg/m
Depth of Section (h): 402.6 mm
Width of Section (b): 177.7 mm
Web Thickness (tw): 7.7 mm
Flange Thickness (tf): 10.9 mm
Root Radius (r): 10.2 mm
Depth Between Fillets (d): 360.4 mm
Local Buckling Ratio d/tw: 46.8
Local Buckling Ratio cf/tf: 8.15
Second Moment of Area Ixx: 18,700 cm4
Second Moment of Area Iyy: 1,020 cm4
Elastic Modulus Zxx: 930 cm3
Elastic Modulus Zyy: 115 cm3
Plastic Modulus Sxx: 1,050 cm3
Plastic Modulus Syy: 178 cm3
Radius of Gyration rxx: 16.5 cm
Radius of Gyration ryy: 3.85 cm
Cross-Sectional Area: 69 cm2
Buckling Parameter (u): 0.871
Torsional Index (x): 38.3
Warping Constant (Iw): 0.392 dm6
Torsional Constant (It): 23.1 cm4
Surface Area per Metre: 1.48 m2/m
Surface Area per Tonne: 27.3 m2/t

406x178 UB — Overview

The 406x178 serial size group contains 5 sections, ranging from 54.1 kg/m to 85.3 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.