80x40 RHS — Sizes, Dimensions & Properties

8 sizes in the 80x40 serial size group. All dimensions in mm, section properties in cm units.

Designation	Mass (kg/m)	D (mm)	B (mm)	t (mm)	A (cm2)	Ixx (cm4)	Iyy (cm4)
80x40x3.0	5.29	80	40	3	6.74	54.2	18
80x40x3.2	5.62	80	40	3.2	7.16	57.2	18.9
80x40x3.6	6.27	80	40	3.6	7.98	62.8	20.6
80x40x4.0	6.9	80	40	4	8.79	68.2	22.2
80x40x5.0	8.42	80	40	5	10.7	80.3	25.7
80x40x6.0	9.87	80	40	6	12.6	90.5	28.5
80x40x6.3	10.3	80	40	6.3	13.1	93.3	29.2
80x40x8.0	12.5	80	40	8	16	106	32.1

80x40x3.0 RHS

Designation: 80x40x3.0
Outside Depth (D): 80 mm
Outside Width (B): 40 mm
Wall Thickness (t): 3 mm
Mass per Metre: 5.29 kg/m
Cross-Sectional Area: 6.74 cm2
Second Moment of Area Ixx: 54.2 cm4
Second Moment of Area Iyy: 18 cm4
Elastic Modulus Zxx: 13.6 cm3
Elastic Modulus Zyy: 9 cm3
Plastic Modulus Sxx: 17.1 cm3
Plastic Modulus Syy: 10.4 cm3
Radius of Gyration rxx: 2.84 cm
Radius of Gyration ryy: 1.63 cm
Torsional Constant (It): 43.8 cm4
Surface Area per Metre: 0.232 m2/m
Surface Area per Tonne: 43.9 m2/t

80x40x3.2 RHS

Designation: 80x40x3.2
Outside Depth (D): 80 mm
Outside Width (B): 40 mm
Wall Thickness (t): 3.2 mm
Mass per Metre: 5.62 kg/m
Cross-Sectional Area: 7.16 cm2
Second Moment of Area Ixx: 57.2 cm4
Second Moment of Area Iyy: 18.9 cm4
Elastic Modulus Zxx: 14.3 cm3
Elastic Modulus Zyy: 9.46 cm3
Plastic Modulus Sxx: 18 cm3
Plastic Modulus Syy: 11 cm3
Radius of Gyration rxx: 2.83 cm
Radius of Gyration ryy: 1.63 cm
Torsional Constant (It): 46.2 cm4
Surface Area per Metre: 0.232 m2/m
Surface Area per Tonne: 41.3 m2/t

80x40x3.6 RHS

Designation: 80x40x3.6
Outside Depth (D): 80 mm
Outside Width (B): 40 mm
Wall Thickness (t): 3.6 mm
Mass per Metre: 6.27 kg/m
Cross-Sectional Area: 7.98 cm2
Second Moment of Area Ixx: 62.8 cm4
Second Moment of Area Iyy: 20.6 cm4
Elastic Modulus Zxx: 15.7 cm3
Elastic Modulus Zyy: 10.3 cm3
Plastic Modulus Sxx: 20 cm3
Plastic Modulus Syy: 12.1 cm3
Radius of Gyration rxx: 2.81 cm
Radius of Gyration ryy: 1.61 cm
Torsional Constant (It): 50.8 cm4
Surface Area per Metre: 0.231 m2/m
Surface Area per Tonne: 36.8 m2/t

80x40x4.0 RHS

Designation: 80x40x4.0
Outside Depth (D): 80 mm
Outside Width (B): 40 mm
Wall Thickness (t): 4 mm
Mass per Metre: 6.9 kg/m
Cross-Sectional Area: 8.79 cm2
Second Moment of Area Ixx: 68.2 cm4
Second Moment of Area Iyy: 22.2 cm4
Elastic Modulus Zxx: 17.1 cm3
Elastic Modulus Zyy: 11.1 cm3
Plastic Modulus Sxx: 21.8 cm3
Plastic Modulus Syy: 13.2 cm3
Radius of Gyration rxx: 2.79 cm
Radius of Gyration ryy: 1.59 cm
Torsional Constant (It): 55.2 cm4
Surface Area per Metre: 0.23 m2/m
Surface Area per Tonne: 33.3 m2/t

80x40x5.0 RHS

Designation: 80x40x5.0
Outside Depth (D): 80 mm
Outside Width (B): 40 mm
Wall Thickness (t): 5 mm
Mass per Metre: 8.42 kg/m
Cross-Sectional Area: 10.7 cm2
Second Moment of Area Ixx: 80.3 cm4
Second Moment of Area Iyy: 25.7 cm4
Elastic Modulus Zxx: 20.1 cm3
Elastic Modulus Zyy: 12.9 cm3
Plastic Modulus Sxx: 26.1 cm3
Plastic Modulus Syy: 15.7 cm3
Radius of Gyration rxx: 2.74 cm
Radius of Gyration ryy: 1.55 cm
Torsional Constant (It): 65.1 cm4
Surface Area per Metre: 0.227 m2/m
Surface Area per Tonne: 27 m2/t

80x40x6.0 RHS

Designation: 80x40x6.0
Outside Depth (D): 80 mm
Outside Width (B): 40 mm
Wall Thickness (t): 6 mm
Mass per Metre: 9.87 kg/m
Cross-Sectional Area: 12.6 cm2
Second Moment of Area Ixx: 90.5 cm4
Second Moment of Area Iyy: 28.5 cm4
Elastic Modulus Zxx: 22.6 cm3
Elastic Modulus Zyy: 14.2 cm3
Plastic Modulus Sxx: 30 cm3
Plastic Modulus Syy: 17.8 cm3
Radius of Gyration rxx: 2.68 cm
Radius of Gyration ryy: 1.5 cm
Torsional Constant (It): 73.4 cm4
Surface Area per Metre: 0.225 m2/m
Surface Area per Tonne: 22.8 m2/t

80x40x6.3 RHS

Designation: 80x40x6.3
Outside Depth (D): 80 mm
Outside Width (B): 40 mm
Wall Thickness (t): 6.3 mm
Mass per Metre: 10.3 kg/m
Cross-Sectional Area: 13.1 cm2
Second Moment of Area Ixx: 93.3 cm4
Second Moment of Area Iyy: 29.2 cm4
Elastic Modulus Zxx: 23.3 cm3
Elastic Modulus Zyy: 14.6 cm3
Plastic Modulus Sxx: 31.1 cm3
Plastic Modulus Syy: 18.4 cm3
Radius of Gyration rxx: 2.67 cm
Radius of Gyration ryy: 1.49 cm
Torsional Constant (It): 75.6 cm4
Surface Area per Metre: 0.224 m2/m
Surface Area per Tonne: 21.8 m2/t

80x40x8.0 RHS

Designation: 80x40x8.0
Outside Depth (D): 80 mm
Outside Width (B): 40 mm
Wall Thickness (t): 8 mm
Mass per Metre: 12.5 kg/m
Cross-Sectional Area: 16 cm2
Second Moment of Area Ixx: 106 cm4
Second Moment of Area Iyy: 32.1 cm4
Elastic Modulus Zxx: 26.5 cm3
Elastic Modulus Zyy: 16.1 cm3
Plastic Modulus Sxx: 36.5 cm3
Plastic Modulus Syy: 21.2 cm3
Radius of Gyration rxx: 2.58 cm
Radius of Gyration ryy: 1.42 cm
Torsional Constant (It): 85.8 cm4
Surface Area per Metre: 0.219 m2/m
Surface Area per Tonne: 17.5 m2/t

80x40 RHS — Overview

The 80x40 serial size group contains 8 sections, ranging from 12.5 kg/m to 5.29 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.