168.3 CHS — Sizes, Dimensions & Properties

7 sizes in the 168.3 serial size group. All dimensions in mm, section properties in cm units.

Designation	Mass (kg/m)	D (mm)	t (mm)	A (cm2)	I (cm4)	Z (cm3)	S (cm3)	r (cm)
168.3x4.0	16.2	168.3	4	20.6	697	82.8	108	5.81
168.3x5.0	20.1	168.3	5	25.7	856	102	133	5.78
168.3x6.0	24	168.3	6	30.6	1,010	120	158	5.74
168.3x6.3	25.2	168.3	6.3	32.1	1,050	125	165	5.73
168.3x8.0	31.6	168.3	8	40.3	1,300	154	206	5.67
168.3x10.0	39	168.3	10	49.7	1,560	186	251	5.61
168.3x12.5	48	168.3	12.5	61.2	1,870	222	304	5.53

168.3x4.0 CHS

Designation: 168.3x4.0
Outside Diameter (D): 168.3 mm
Wall Thickness (t): 4 mm
Mass per Metre: 16.2 kg/m
Cross-Sectional Area: 20.6 cm2
Second Moment of Area I: 697 cm4
Elastic Modulus Z: 82.8 cm3
Plastic Modulus S: 108 cm3
Radius of Gyration r: 5.81 cm
Torsional Constant (It): 1,390 cm4
Surface Area per Metre: 0.529 m2/m
Surface Area per Tonne: 32.6 m2/t

168.3x5.0 CHS

Designation: 168.3x5.0
Outside Diameter (D): 168.3 mm
Wall Thickness (t): 5 mm
Mass per Metre: 20.1 kg/m
Cross-Sectional Area: 25.7 cm2
Second Moment of Area I: 856 cm4
Elastic Modulus Z: 102 cm3
Plastic Modulus S: 133 cm3
Radius of Gyration r: 5.78 cm
Torsional Constant (It): 1,710 cm4
Surface Area per Metre: 0.529 m2/m
Surface Area per Tonne: 26.3 m2/t

168.3x6.0 CHS

Designation: 168.3x6.0
Outside Diameter (D): 168.3 mm
Wall Thickness (t): 6 mm
Mass per Metre: 24 kg/m
Cross-Sectional Area: 30.6 cm2
Second Moment of Area I: 1,010 cm4
Elastic Modulus Z: 120 cm3
Plastic Modulus S: 158 cm3
Radius of Gyration r: 5.74 cm
Torsional Constant (It): 2,020 cm4
Surface Area per Metre: 0.529 m2/m
Surface Area per Tonne: 22 m2/t

168.3x6.3 CHS

Designation: 168.3x6.3
Outside Diameter (D): 168.3 mm
Wall Thickness (t): 6.3 mm
Mass per Metre: 25.2 kg/m
Cross-Sectional Area: 32.1 cm2
Second Moment of Area I: 1,050 cm4
Elastic Modulus Z: 125 cm3
Plastic Modulus S: 165 cm3
Radius of Gyration r: 5.73 cm
Torsional Constant (It): 2,110 cm4
Surface Area per Metre: 0.529 m2/m
Surface Area per Tonne: 21 m2/t

168.3x8.0 CHS

Designation: 168.3x8.0
Outside Diameter (D): 168.3 mm
Wall Thickness (t): 8 mm
Mass per Metre: 31.6 kg/m
Cross-Sectional Area: 40.3 cm2
Second Moment of Area I: 1,300 cm4
Elastic Modulus Z: 154 cm3
Plastic Modulus S: 206 cm3
Radius of Gyration r: 5.67 cm
Torsional Constant (It): 2,600 cm4
Surface Area per Metre: 0.529 m2/m
Surface Area per Tonne: 16.7 m2/t

168.3x10.0 CHS

Designation: 168.3x10.0
Outside Diameter (D): 168.3 mm
Wall Thickness (t): 10 mm
Mass per Metre: 39 kg/m
Cross-Sectional Area: 49.7 cm2
Second Moment of Area I: 1,560 cm4
Elastic Modulus Z: 186 cm3
Plastic Modulus S: 251 cm3
Radius of Gyration r: 5.61 cm
Torsional Constant (It): 3,130 cm4
Surface Area per Metre: 0.529 m2/m
Surface Area per Tonne: 13.5 m2/t

168.3x12.5 CHS

Designation: 168.3x12.5
Outside Diameter (D): 168.3 mm
Wall Thickness (t): 12.5 mm
Mass per Metre: 48 kg/m
Cross-Sectional Area: 61.2 cm2
Second Moment of Area I: 1,870 cm4
Elastic Modulus Z: 222 cm3
Plastic Modulus S: 304 cm3
Radius of Gyration r: 5.53 cm
Torsional Constant (It): 3,740 cm4
Surface Area per Metre: 0.529 m2/m
Surface Area per Tonne: 11 m2/t

168.3 CHS — Overview

The 168.3 serial size group contains 7 sections, ranging from 48 kg/m to 16.2 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.

Need Components for This Section?

Structural Steel Components supplies stiffener plates, end plates, base plates, cleats, and fixings matched to standard UK sections.

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