168.3x4.8CHS Circular Hollow Section

AS/NZS 1163Grade C350L0

The 168.3x4.8CHS is a circular hollow section to AS/NZS 1163. It is 168.3 mm outside diameter with a 4.8 mm wall, has a mass of 19.4 kg/m and a gross area of 2466 mm². Its major-axis second moment of area is I_x = 8.25 × 10⁶ mm⁴ and in Grade C350L0 (f_y = 350 MPa) its section moment capacity is φM_sx = 40.4 kNm. Download its free DXF drawing (a true-scale CAD outline) below, or print the dimensioned drawing sheet.

Also written as: 168.3 x 4.8 CHS, 168.3x4.8 CHS

DXF (AutoCAD R12)SVG drawingJSON data

‹ 168.3x6.4CHS All Circular Hollow Sections 165.1x5.4CHS ›

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Dimensions

168.3x4.8CHS dimensions
Symbol	Property	Value	Unit
d_o	Outside diameter	168.3	mm
t	Wall thickness	4.8	mm
d_i	Inside diameter	158.7	mm

Section properties

168.3x4.8CHS section properties
Symbol	Property	Value	Unit
m	Mass per metre (nominal)	19.4	kg/m
A_g	Gross cross-section area	2466	mm²
I_x	Second moment of area about x-axis	8.25	10⁶ mm⁴
Z_x	Elastic section modulus, x-axis	98.0	10³ mm³
S_x	Plastic section modulus, x-axis	128	10³ mm³
r_x	Radius of gyration, x-axis	57.8	mm
I_y	Second moment of area about y-axis	8.25	10⁶ mm⁴
Z_y	Elastic section modulus, y-axis	98.0	10³ mm³
S_y	Plastic section modulus, y-axis	128	10³ mm³
r_y	Radius of gyration, y-axis	57.8	mm
J	Torsion constant	16491	10³ mm⁴
C	Torsion modulus	196	10³ mm³
A_s	External surface area per metre	0.529	m²/m
A_s/t	External surface area per tonne	27.3	m²/t

Axes: x-x is the major axis and y-y the minor axis, both through the centroid.

Length (m) Quantity Mass 116.4 kg · surface area 3.17 m²

Design capacities to AS 4100

AS 4100 design capacities – Grade C350L0
Symbol	Property	Value	Unit
	Steel grade	C350L0 (AS/NZS 1163)
f_y	Yield stress used	350	MPa
f_u	Tensile strength	430	MPa
k_f	Form factor (Cl. 6.2.2)	1.000
	Section class, x-axis (Cl. 5.2)	Compact
Z_ex	Effective section modulus, x-axis	128	10³ mm³
φM_sx	Section moment capacity, x-axis	40.4	kNm
	Section class, y-axis	Compact
Z_ey	Effective section modulus, y-axis	128	10³ mm³
φM_sy	Section moment capacity, y-axis	40.4	kNm
φN_s	Section compression capacity (Cl. 6.2.1)	777	kN
φN_t	Tension capacity, gross section (Cl. 7.2, k_t=1, A_n=A_g)	777	kN
φV_v	Shear capacity (Cl. 5.11)	280	kN
α_b	Compression member section constant (Table 6.3.3)	-0.5

Member capacity vs effective length (α_m = 1.0)
L_e (m)	φN_cx (kN)	φN_cy (kN)
0.5	777	777
1	767	767
1.5	750	750
2	728	728
2.5	700	700
3	664	664
3.5	621	621
4	570	570
5	453	453
6	347	347
7	267	267
8	209	209
9	168	168
10	137	137
12	96.6	96.6

φN_c: Cl. 6.3.3, pin-ended effective length L_e = k_eL, concentric load.

φNcx (kN)φNcy (kN)

Member capacity calculator

Effective length L_e (m) i Steel grade i

Check it for a span and loads with the beam calculator.

For restraint types, k_tk_lk_r and α_m, use the lateral restraint calculator.

Instant check only. Effective lengths and moment modification factors must be determined by the designer in accordance with AS 4100 Cl. 4.6, 5.6.3 and 6.3.2. Not a substitute for a qualified engineer: see the disclaimer.

Alternatives with similar bending capacity

Sections from other families with a plastic modulus S_x within −8% / +25% of the 168.3x4.8CHS, lightest first.

Section	Type	Mass (kg/m)	S_x (10³ mm³)	I_x (10⁶ mm⁴)
180UB16.1	Universal Beam	16.1	138	10.6
150PFC	Parallel Flange Channel	17.7	129	8.34
200x100x4.0RHS	Rectangular Hollow Section	17.9	147	11.9
150UB18.0	Universal Beam	18.0	135	9.05
180UB18.1	Universal Beam	18.1	157	12.1
150x100x6.0RHS	Rectangular Hollow Section	21.4	134	8.17

Other circular hollow sections

508.0x12.7CHS 508.0x9.5CHS 508.0x6.4CHS 457.0x12.7CHS 457.0x9.5CHS 457.0x6.4CHS 406.4x12.7CHS 406.4x9.5CHS 406.4x6.4CHS 355.6x12.7CHS 355.6x9.5CHS 355.6x6.4CHS 323.9x12.7CHS 323.9x9.5CHS 323.9x6.4CHS 273.1x12.7CHS 273.1x9.3CHS 273.1x6.4CHS 273.1x4.8CHS 219.1x8.2CHS 219.1x6.4CHS 219.1x4.8CHS 168.3x7.1CHS 168.3x6.4CHS 168.3x4.8CHS 165.1x5.4CHS 165.1x5.0CHS 165.1x3.5CHS 165.1x3.0CHS 139.7x5.4CHS 139.7x5.0CHS 139.7x3.5CHS 139.7x3.0CHS 114.3x5.4CHS 114.3x4.5CHS 114.3x3.6CHS 114.3x3.2CHS 101.6x5.0CHS 101.6x4.0CHS 101.6x3.2CHS 101.6x2.6CHS 88.9x5.9CHS 88.9x5.0CHS 88.9x4.0CHS 88.9x3.2CHS 88.9x2.6CHS 76.1x5.9CHS 76.1x4.5CHS 76.1x3.6CHS 76.1x3.2CHS 76.1x2.3CHS 60.3x5.4CHS 60.3x4.5CHS 60.3x3.6CHS 60.3x2.9CHS 60.3x2.3CHS 48.3x4.0CHS 48.3x3.2CHS 48.3x2.9CHS 48.3x2.3CHS 42.4x4.0CHS 42.4x3.2CHS 42.4x2.6CHS 42.4x2.0CHS 33.7x4.0CHS 33.7x3.2CHS 33.7x2.6CHS 33.7x2.0CHS 26.9x4.0CHS 26.9x3.2CHS 26.9x2.6CHS 26.9x2.3CHS 26.9x2.0CHS

Relevant Australian Standards

AS/NZS 1163:2016 Cold-formed structural steel hollow sections
Covers cold-formed CHS, RHS and SHS in Grades C250L0, C350L0 and C450L0, including the corner-radius and thickness tolerances used to calculate section properties.
AS 4100:2020 Steel structures
The Australian design Standard for steel members and connections. Covers section classification (Section 5), member moment capacity including lateral-torsional buckling (5.6), shear (5.11), axial compression (Section 6), tension (Section 7) and combined actions (Section 8).
AS/NZS 1554.1:2014 Structural steel welding – Welding of steel structures
Weld procedures, welder qualification, weld categories (SP and GP) and inspection requirements for structural welds.
AS/NZS 2312.1:2014 & 2312.2:2014 Guide to the protection of structural steel against atmospheric corrosion
Part 1 covers protective paint coatings and Part 2 hot-dip galvanizing; both use the external surface areas given on each section page.

See all Australian Standards for structural steel.

Properties are calculated from nominal dimensions, including root and toe radii, as described in notation & method. Mass is the nominal catalogue mass; the calculated mass at 7850 kg/m³ is 19.35 kg/m. Verify against current manufacturer literature before use in design. Spotted an error? Report it.