350x250 RHS — Sizes, Dimensions & Properties

9 sizes in the 350x250 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)
350x250x5.0	46.1	350	250	5	58.7	10,600	6,360
350x250x6.0	55.1	350	250	6	70.2	12,616	7,538
350x250x6.3	57.8	350	250	6.3	73.6	13,203	7,885
350x250x8.0	72.8	350	250	8	92.8	16,449	9,798
350x250x10.0	90.2	350	250	10	115	20,102	11,937
350x250x12.0	107	350	250	12	137	23,577	13,957
350x250x12.5	112	350	250	12.5	142	24,419	14,444
350x250x14.2	126	350	250	14.2	160	27,200	16,000
350x250x16.0	141	350	250	16	179	30,011	17,654

350x250x5.0 RHS

Designation: 350x250x5.0
Outside Depth (D): 350 mm
Outside Width (B): 250 mm
Wall Thickness (t): 5 mm
Mass per Metre: 46.1 kg/m
Cross-Sectional Area: 58.7 cm2
Second Moment of Area Ixx: 10,600 cm4
Second Moment of Area Iyy: 6,360 cm4
Elastic Modulus Zxx: 607 cm3
Elastic Modulus Zyy: 509 cm3
Plastic Modulus Sxx: 716 cm3
Plastic Modulus Syy: 569 cm3
Radius of Gyration rxx: 13.5 cm
Radius of Gyration ryy: 10.4 cm
Torsional Constant (It): 12,200 cm4
Surface Area per Metre: 1.19 m2/m
Surface Area per Tonne: 25.8 m2/t

350x250x6.0 RHS

Designation: 350x250x6.0
Outside Depth (D): 350 mm
Outside Width (B): 250 mm
Wall Thickness (t): 6 mm
Mass per Metre: 55.1 kg/m
Cross-Sectional Area: 70.2 cm2
Second Moment of Area Ixx: 12,616 cm4
Second Moment of Area Iyy: 7,538 cm4
Elastic Modulus Zxx: 721 cm3
Elastic Modulus Zyy: 603 cm3
Plastic Modulus Sxx: 852 cm3
Plastic Modulus Syy: 677 cm3
Radius of Gyration rxx: 13.4 cm
Radius of Gyration ryy: 10.4 cm
Torsional Constant (It): 14,529 cm4
Surface Area per Metre: 1.18 m2/m
Surface Area per Tonne: 21.4 m2/t

350x250x6.3 RHS

Designation: 350x250x6.3
Outside Depth (D): 350 mm
Outside Width (B): 250 mm
Wall Thickness (t): 6.3 mm
Mass per Metre: 57.8 kg/m
Cross-Sectional Area: 73.6 cm2
Second Moment of Area Ixx: 13,203 cm4
Second Moment of Area Iyy: 7,885 cm4
Elastic Modulus Zxx: 754 cm3
Elastic Modulus Zyy: 631 cm3
Plastic Modulus Sxx: 892 cm3
Plastic Modulus Syy: 709 cm3
Radius of Gyration rxx: 13.4 cm
Radius of Gyration ryy: 10.4 cm
Torsional Constant (It): 15,215 cm4
Surface Area per Metre: 1.18 m2/m
Surface Area per Tonne: 20.4 m2/t

350x250x8.0 RHS

Designation: 350x250x8.0
Outside Depth (D): 350 mm
Outside Width (B): 250 mm
Wall Thickness (t): 8 mm
Mass per Metre: 72.8 kg/m
Cross-Sectional Area: 92.8 cm2
Second Moment of Area Ixx: 16,449 cm4
Second Moment of Area Iyy: 9,798 cm4
Elastic Modulus Zxx: 940 cm3
Elastic Modulus Zyy: 784 cm3
Plastic Modulus Sxx: 1,118 cm3
Plastic Modulus Syy: 888 cm3
Radius of Gyration rxx: 13.3 cm
Radius of Gyration ryy: 10.3 cm
Torsional Constant (It): 19,027 cm4
Surface Area per Metre: 1.18 m2/m
Surface Area per Tonne: 16.2 m2/t

350x250x10.0 RHS

Designation: 350x250x10.0
Outside Depth (D): 350 mm
Outside Width (B): 250 mm
Wall Thickness (t): 10 mm
Mass per Metre: 90.2 kg/m
Cross-Sectional Area: 115 cm2
Second Moment of Area Ixx: 20,102 cm4
Second Moment of Area Iyy: 11,937 cm4
Elastic Modulus Zxx: 1,149 cm3
Elastic Modulus Zyy: 955 cm3
Plastic Modulus Sxx: 1,375 cm3
Plastic Modulus Syy: 1,091 cm3
Radius of Gyration rxx: 13.2 cm
Radius of Gyration ryy: 10.2 cm
Torsional Constant (It): 23,354 cm4
Surface Area per Metre: 1.17 m2/m
Surface Area per Tonne: 13 m2/t

350x250x12.0 RHS

Designation: 350x250x12.0
Outside Depth (D): 350 mm
Outside Width (B): 250 mm
Wall Thickness (t): 12 mm
Mass per Metre: 107 kg/m
Cross-Sectional Area: 137 cm2
Second Moment of Area Ixx: 23,577 cm4
Second Moment of Area Iyy: 13,957 cm4
Elastic Modulus Zxx: 1,347 cm3
Elastic Modulus Zyy: 1,117 cm3
Plastic Modulus Sxx: 1,624 cm3
Plastic Modulus Syy: 1,286 cm3
Radius of Gyration rxx: 13.1 cm
Radius of Gyration ryy: 10.1 cm
Torsional Constant (It): 27,513 cm4
Surface Area per Metre: 1.17 m2/m
Surface Area per Tonne: 10.9 m2/t

350x250x12.5 RHS

Designation: 350x250x12.5
Outside Depth (D): 350 mm
Outside Width (B): 250 mm
Wall Thickness (t): 12.5 mm
Mass per Metre: 112 kg/m
Cross-Sectional Area: 142 cm2
Second Moment of Area Ixx: 24,419 cm4
Second Moment of Area Iyy: 14,444 cm4
Elastic Modulus Zxx: 1,395 cm3
Elastic Modulus Zyy: 1,156 cm3
Plastic Modulus Sxx: 1,685 cm3
Plastic Modulus Syy: 1,334 cm3
Radius of Gyration rxx: 13.1 cm
Radius of Gyration ryy: 10.1 cm
Torsional Constant (It): 28,526 cm4
Surface Area per Metre: 1.17 m2/m
Surface Area per Tonne: 10.4 m2/t

350x250x14.2 RHS

Designation: 350x250x14.2
Outside Depth (D): 350 mm
Outside Width (B): 250 mm
Wall Thickness (t): 14.2 mm
Mass per Metre: 126 kg/m
Cross-Sectional Area: 160 cm2
Second Moment of Area Ixx: 27,200 cm4
Second Moment of Area Iyy: 16,000 cm4
Elastic Modulus Zxx: 1,550 cm3
Elastic Modulus Zyy: 1,280 cm3
Plastic Modulus Sxx: 1,890 cm3
Plastic Modulus Syy: 1,490 cm3
Radius of Gyration rxx: 13 cm
Radius of Gyration ryy: 10 cm
Torsional Constant (It): 31,900 cm4
Surface Area per Metre: 1.16 m2/m
Surface Area per Tonne: 9.2 m2/t

350x250x16.0 RHS

Designation: 350x250x16.0
Outside Depth (D): 350 mm
Outside Width (B): 250 mm
Wall Thickness (t): 16 mm
Mass per Metre: 141 kg/m
Cross-Sectional Area: 179 cm2
Second Moment of Area Ixx: 30,011 cm4
Second Moment of Area Iyy: 17,654 cm4
Elastic Modulus Zxx: 1,715 cm3
Elastic Modulus Zyy: 1,412 cm3
Plastic Modulus Sxx: 2,095 cm3
Plastic Modulus Syy: 1,655 cm3
Radius of Gyration rxx: 12.9 cm
Radius of Gyration ryy: 9.93 cm
Torsional Constant (It): 35,325 cm4
Surface Area per Metre: 1.16 m2/m
Surface Area per Tonne: 8.2 m2/t

350x250 RHS — Overview

The 350x250 serial size group contains 9 sections, ranging from 141 kg/m to 46.1 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.