Circular Hollow Sections CHS

AS/NZS 1163

Cold-formed structural tubes, used for columns, trusses, bracing, handrails and space frames. Dimensions, section properties, AS 4100 capacities and free DXF drawings for all 73 sizes.

Circular hollow sections (CHS) are cold-formed structural tubes to AS/NZS 1163, typically Grade C350L0. Because they have equal properties about every axis and high torsional stiffness, they suit columns, struts, trusses, space frames, bollards and handrails. Outside diameters follow international pipe sizes, e.g. 88.9, 114.3 and 168.3 mm.

Dimension notation

Select any section in the table to open its page, with a dimensioned drawing, all section properties, AS 4100 capacities and a free DXF download for your CAD software.

Click a column heading to sort. Grade C350L0 capacities.

Designation	Mass kg/m	d_o mm	t mm	A_g mm²	I_x 10⁶mm⁴	Z_x 10³mm³	S_x 10³mm³	I_y 10⁶mm⁴	r_y mm	J 10³mm⁴	φM_sx kNm	φN_s kN
508.0x12.7CHS	155.0	508	12.7	19762	606	2387	3116	606	175.2	1212786	961.9	6225
508.0x9.5CHS	117.0	508	9.5	14878	462	1820	2361	462	176.3	924627	683.2	4687
508.0x6.4CHS	79.2	508	6.4	10085	317	1249	1610	317	177.4	634473	407.9	2729
457.0x12.7CHS	139.0	457	12.7	17727	438	1916	2508	438	157.1	875543	788.9	5584
457.0x9.5CHS	105.0	457	9.5	13356	334	1464	1903	334	158.3	668942	565.1	4207
457.0x6.4CHS	71.1	457	6.4	9060	230	1007	1300	230	159.3	459972	343.5	2585
406.4x12.7CHS	123.0	406.4	12.7	15708	305	1499	1969	305	139.3	609315	620.3	4948
406.4x9.5CHS	93.0	406.4	9.5	11846	233	1149	1497	233	140.4	466773	456.0	3731
406.4x6.4CHS	63.1	406.4	6.4	8042	161	792	1024	161	141.4	321781	281.9	2433
355.6x12.7CHS	107.0	355.6	12.7	13681	201	1132	1494	201	121.3	402709	470.6	4310
355.6x9.5CHS	81.1	355.6	9.5	10329	155	871	1138	155	122.4	309560	355.7	3254
355.6x6.4CHS	55.1	355.6	6.4	7021	107	602	781	107	123.5	214111	223.6	2212
323.9x12.7CHS	97.5	323.9	12.7	12416	151	930	1231	151	110.1	301117	387.6	3911
323.9x9.5CHS	73.7	323.9	9.5	9383	116	717	939	116	111.2	232091	295.9	2956
323.9x6.4CHS	50.1	323.9	6.4	6384	80.5	497	645	80.5	112.3	160945	189.3	2011
273.1x12.7CHS	81.6	273.1	12.7	10389	88.3	646	862	88.3	92.2	176542	271.5	3273
273.1x9.3CHS	60.5	273.1	9.3	7707	67.1	492	647	67.1	93.3	134257	203.9	2428
273.1x6.4CHS	42.1	273.1	6.4	5362	47.7	349	455	47.7	94.3	95409	138.8	1689
273.1x4.8CHS	31.8	273.1	4.8	4046	36.4	267	346	36.4	94.9	72834	98.3	1274
219.1x8.2CHS	42.6	219.1	8.2	5433	30.3	276	365	30.3	74.6	60505	114.9	1711
219.1x6.4CHS	33.6	219.1	6.4	4277	24.2	221	290	24.2	75.2	48413	91.2	1347
219.1x4.8CHS	25.4	219.1	4.8	3232	18.6	169	220	18.6	75.8	37121	66.3	1018
168.3x7.1CHS	28.2	168.3	7.1	3596	11.7	139	185	11.7	57.0	23404	58.2	1133
168.3x6.4CHS	25.6	168.3	6.4	3255	10.7	127	168	10.7	57.3	21364	52.9	1025
168.3x4.8CHS	19.4	168.3	4.8	2466	8.25	98.0	128	8.25	57.8	16491	40.4	777
165.1x5.4CHS	21.3	165.1	5.4	2709	8.65	105	138	8.65	56.5	17294	31.0	610
165.1x5.0CHS	19.7	165.1	5.0	2515	8.07	97.7	128	8.07	56.6	16131	28.8	566
165.1x3.5CHS	13.9	165.1	3.5	1777	5.80	70.3	91.4	5.80	57.1	11606	27.3	560
165.1x3.0CHS	12.0	165.1	3.0	1528	5.02	60.8	78.8	5.02	57.3	10039	22.6	481
139.7x5.4CHS	17.9	139.7	5.4	2278	5.14	73.7	97.4	5.14	47.5	10290	21.9	513
139.7x5.0CHS	16.6	139.7	5.0	2116	4.81	68.8	90.8	4.81	47.7	9611	20.4	476
139.7x3.5CHS	11.8	139.7	3.5	1498	3.47	49.7	64.9	3.47	48.2	6950	20.1	472
139.7x3.0CHS	10.1	139.7	3.0	1288	3.01	43.1	56.1	3.01	48.3	6022	16.8	406
114.3x5.4CHS	14.5	114.3	5.4	1847	2.75	48.0	64.1	2.75	38.5	5491	14.4	416
114.3x4.5CHS	12.2	114.3	4.5	1552	2.34	41.0	54.3	2.34	38.9	4686	12.2	349
114.3x3.6CHS	9.83	114.3	3.6	1252	1.92	33.6	44.1	1.92	39.2	3840	13.9	394
114.3x3.2CHS	8.77	114.3	3.2	1117	1.72	30.2	39.5	1.72	39.3	3449	12.4	352
101.6x5.0CHS	11.9	101.6	5.0	1517	1.77	34.9	46.7	1.77	34.2	3549	10.5	341
101.6x4.0CHS	9.63	101.6	4.0	1226	1.46	28.8	38.1	1.46	34.5	2926	8.6	276
101.6x3.2CHS	7.77	101.6	3.2	989	1.20	23.6	31.0	1.20	34.8	2397	9.8	312
101.6x2.6CHS	6.35	101.6	2.6	809	0.991	19.5	25.5	0.991	35.0	1983	7.9	255
88.9x5.9CHS	12.1	88.9	5.9	1538	1.33	30.0	40.7	1.33	29.4	2663	9.2	346
88.9x5.0CHS	10.3	88.9	5.0	1318	1.16	26.2	35.2	1.16	29.7	2327	7.9	297
88.9x4.0CHS	8.38	88.9	4.0	1067	0.963	21.7	28.9	0.963	30.0	1927	6.5	240
88.9x3.2CHS	6.76	88.9	3.2	862	0.792	17.8	23.5	0.792	30.3	1584	7.4	271
88.9x2.6CHS	5.53	88.9	2.6	705	0.657	14.8	19.4	0.657	30.5	1314	6.1	222
76.1x5.9CHS	10.2	76.1	5.9	1301	0.807	21.2	29.1	0.807	24.9	1614	6.6	293
76.1x4.5CHS	7.95	76.1	4.5	1012	0.651	17.1	23.1	0.651	25.4	1302	5.2	228
76.1x3.6CHS	6.44	76.1	3.6	820	0.540	14.2	18.9	0.540	25.7	1080	4.3	184
76.1x3.2CHS	5.75	76.1	3.2	733	0.488	12.8	17.0	0.488	25.8	976	5.4	231
76.1x2.3CHS	4.19	76.1	2.3	533	0.363	9.55	12.5	0.363	26.1	727	3.9	168
60.3x5.4CHS	7.31	60.3	5.4	931	0.354	11.8	16.3	0.354	19.5	709	3.7	210
60.3x4.5CHS	6.19	60.3	4.5	789	0.309	10.2	14.0	0.309	19.8	618	3.2	177
60.3x3.6CHS	5.03	60.3	3.6	641	0.259	8.58	11.6	0.259	20.1	517	2.6	144
60.3x2.9CHS	4.11	60.3	2.9	523	0.216	7.16	9.56	0.216	20.3	432	3.0	165
60.3x2.3CHS	3.29	60.3	2.3	419	0.177	5.85	7.74	0.177	20.5	353	2.4	132
48.3x4.0CHS	4.37	48.3	4.0	557	0.138	5.70	7.87	0.138	15.7	275	1.8	125
48.3x3.2CHS	3.56	48.3	3.2	453	0.116	4.80	6.52	0.116	16.0	232	1.5	102
48.3x2.9CHS	3.25	48.3	2.9	414	0.107	4.43	5.99	0.107	16.1	214	1.9	130
48.3x2.3CHS	2.61	48.3	2.3	332	0.0881	3.65	4.87	0.0881	16.3	176	1.5	105
42.4x4.0CHS	3.79	42.4	4.0	483	0.0899	4.24	5.92	0.0899	13.6	180	1.3	109
42.4x3.2CHS	3.09	42.4	3.2	394	0.0762	3.59	4.93	0.0762	13.9	152	1.1	89
42.4x2.6CHS	2.55	42.4	2.6	325	0.0646	3.05	4.12	0.0646	14.1	129	1.3	102
42.4x2.0CHS	1.99	42.4	2.0	254	0.0519	2.45	3.27	0.0519	14.3	104	1.0	80
33.7x4.0CHS	2.93	33.7	4.0	373	0.0419	2.49	3.55	0.0419	10.6	83.8	0.8	84
33.7x3.2CHS	2.41	33.7	3.2	307	0.0360	2.14	2.99	0.0360	10.8	72.1	0.7	69
33.7x2.6CHS	1.99	33.7	2.6	254	0.0309	1.84	2.52	0.0309	11.0	61.9	0.8	80
33.7x2.0CHS	1.56	33.7	2.0	199	0.0251	1.49	2.01	0.0251	11.2	50.2	0.6	63
26.9x4.0CHS	2.26	26.9	4.0	288	0.0194	1.45	2.12	0.0194	8.2	38.9	0.5	65
26.9x3.2CHS	1.87	26.9	3.2	238	0.0170	1.27	1.81	0.0170	8.5	34.1	0.4	54
26.9x2.6CHS	1.56	26.9	2.6	198	0.0148	1.10	1.54	0.0148	8.6	29.6	0.3	45
26.9x2.3CHS	1.40	26.9	2.3	178	0.0136	1.01	1.40	0.0136	8.7	27.1	0.4	56
26.9x2.0CHS	1.23	26.9	2.0	156	0.0122	0.907	1.24	0.0122	8.8	24.4	0.4	49

All CHS DXFs (.zip) Table as CSV Compare sections

Frequently asked questions

What does C350L0 mean?: Cold-formed (C), 350 MPa minimum yield, L0 = impact tested at 0 °C, to AS/NZS 1163.

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.