Rectangular Hollow Sections RHS

AS/NZS 1163

Cold-formed rectangular tubes, used for beams, lintels, purlins, frames and trailer chassis. Dimensions, section properties, AS 4100 capacities and free DXF drawings for all 89 sizes.

Rectangular hollow sections (RHS) are cold-formed to AS/NZS 1163, usually Grade C450L0 for common sizes. Their closed shape gives high torsional stiffness, so deep RHS beams can span much further unrestrained than an open section of similar mass. They are used for lintels, beams, purlins, frames, trailer chassis and architectural framing.

The designation is depth × width × thickness, and properties are calculated with the long side vertical (x-axis = major axis).

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 C450L0 capacities.

Designation	Mass kg/m	d mm	b 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
400x300x16.0RHS	161.0	400	300	16.0	20497	453	2263	2752	290	119.0	586377	1114.7	8301
400x300x12.5RHS	128.0	400	300	12.5	16338	370	1852	2226	238	120.8	471063	901.3	6593
400x300x10.0RHS	104.0	400	300	10.0	13257	306	1530	1824	197	122.0	384070	648.7	4706
400x300x8.0RHS	84.2	400	300	8.0	10724	251	1256	1487	162	123.0	311789	427.2	3106
400x200x16.0RHS	136.0	400	200	16.0	17297	335	1673	2138	113	80.8	289716	865.9	7005
400x200x12.5RHS	109.0	400	200	12.5	13838	276	1382	1741	94.0	82.4	235630	705.2	5581
400x200x10.0RHS	88.4	400	200	10.0	11257	230	1150	1434	78.6	83.6	193685	580.7	3896
400x200x8.0RHS	71.6	400	200	8.0	9124	190	949	1173	65.2	84.5	158202	467.4	2753
350x250x16.0RHS	136.0	350	250	16.0	17297	283	1616	1993	168	98.5	355009	807.1	7005
350x250x12.5RHS	109.0	350	250	12.5	13838	233	1334	1622	139	100.2	287028	656.8	5605
350x250x10.0RHS	88.4	350	250	10.0	11257	194	1109	1335	116	101.5	234997	532.8	4301
350x250x8.0RHS	71.6	350	250	8.0	9124	160	914	1092	95.7	102.4	191363	375.8	3077
300x200x16.0RHS	111.0	300	200	16.0	14097	161	1075	1353	85.7	78.0	192942	548.0	5709
300x200x12.5RHS	89.0	300	200	12.5	11338	135	899	1112	72.0	79.7	157596	450.2	4592
300x200x10.0RHS	72.7	300	200	10.0	9257	113	754	921	60.6	80.9	129871	373.0	3749
300x200x8.0RHS	59.1	300	200	8.0	7524	93.9	626	757	50.4	81.9	106265	302.1	2753
300x200x6.0RHS	45.0	300	200	6.0	5732	73.0	487	583	39.3	82.8	81434	187.6	1747
250x150x16.0RHS	85.5	250	150	16.0	10897	80.2	641	834	35.8	57.3	88214	337.6	4413
250x150x12.5RHS	69.4	250	150	12.5	8838	68.5	548	695	30.8	59.0	73414	281.7	3580
250x150x10.0RHS	57.0	250	150	10.0	7257	58.2	466	582	26.3	60.2	61207	235.7	2939
250x150x9.0RHS	51.8	250	150	9.0	6598	53.7	429	533	24.3	60.7	55958	215.9	2672
250x150x8.0RHS	46.5	250	150	8.0	5924	48.9	391	482	22.2	61.2	50504	195.3	2399
250x150x6.0RHS	35.6	250	150	6.0	4532	38.4	307	374	17.5	62.2	39002	149.2	1548
250x150x5.0RHS	29.9	250	150	5.0	3814	32.7	262	317	15.0	62.6	32960	111.4	1176
200x100x10.0RHS	41.3	200	100	10.0	5257	24.4	244	318	8.18	39.4	21541	128.8	2129
200x100x9.0RHS	37.7	200	100	9.0	4798	22.8	228	293	7.64	39.9	19883	118.8	1943
200x100x8.0RHS	33.9	200	100	8.0	4324	20.9	209	267	7.05	40.4	18107	108.2	1751
200x100x6.0RHS	26.2	200	100	6.0	3332	16.7	167	210	5.69	41.3	14216	85.1	1305
200x100x5.0RHS	22.1	200	100	5.0	2814	14.4	144	179	4.92	41.8	12105	72.6	974
200x100x4.0RHS	17.9	200	100	4.0	2281	11.9	119	147	4.07	42.3	9888	58.4	688
152x76x6.0RHS	19.4	152	76	6.0	2468	6.91	90.9	116	2.33	30.7	5976	47.0	1000
152x76x5.0RHS	16.4	152	76	5.0	2094	6.01	79.0	99.8	2.04	31.2	5134	40.4	848
150x100x10.0RHS	33.4	150	100	10.0	4257	11.6	155	199	6.14	38.0	14259	80.7	1724
150x100x9.0RHS	30.6	150	100	9.0	3898	10.9	145	185	5.77	38.5	13203	74.8	1579
150x100x8.0RHS	27.7	150	100	8.0	3524	10.1	134	169	5.36	39.0	12059	68.5	1427
150x100x6.0RHS	21.4	150	100	6.0	2732	8.17	109	134	4.36	40.0	9513	54.4	1107
150x100x5.0RHS	18.2	150	100	5.0	2314	7.07	94.3	115	3.79	40.4	8117	46.6	937
150x100x4.0RHS	14.8	150	100	4.0	1881	5.87	78.2	94.6	3.15	40.9	6642	37.8	688
150x50x6.0RHS	16.7	150	50	6.0	2132	5.06	67.5	91.1	0.860	20.1	2632	36.9	864
150x50x5.0RHS	14.2	150	50	5.0	1814	4.44	59.2	78.9	0.765	20.5	2301	31.9	735
150x50x4.0RHS	11.6	150	50	4.0	1481	3.74	49.8	65.4	0.653	21.0	1925	26.5	526
150x50x3.0RHS	8.96	150	50	3.0	1141	2.99	39.8	51.4	0.526	21.5	1502	20.8	329
150x50x2.5RHS	7.53	150	50	2.5	959	2.54	33.9	43.5	0.452	21.7	1277	17.6	246
150x50x2.0RHS	6.07	150	50	2.0	774	2.08	27.7	35.3	0.372	21.9	1042	12.8	173
127x51x6.0RHS	14.7	127	51	6.0	1868	3.28	51.6	68.9	0.761	20.2	2205	27.9	757
127x51x5.0RHS	12.5	127	51	5.0	1594	2.89	45.6	59.9	0.679	20.6	1929	24.3	646
127x51x3.5RHS	9.07	127	51	3.5	1155	2.20	34.7	44.6	0.526	21.3	1444	18.1	423
125x75x6.0RHS	16.7	125	75	6.0	2132	4.16	66.6	84.2	1.87	29.6	4442	34.1	864
125x75x5.0RHS	14.2	125	75	5.0	1814	3.64	58.2	72.7	1.65	30.1	3825	29.5	735
125x75x4.0RHS	11.6	125	75	4.0	1481	3.05	48.9	60.3	1.39	30.6	3157	24.4	600
125x75x3.0RHS	8.96	125	75	3.0	1141	2.43	38.9	47.3	1.11	31.1	2429	18.8	390
125x75x2.5RHS	7.53	125	75	2.5	959	2.07	33.0	40.0	0.942	31.4	2053	14.1	296
125x75x2.0RHS	6.07	125	75	2.0	774	1.69	27.0	32.5	0.771	31.6	1665	9.2	196
102x76x6.0RHS	14.7	102	76	6.0	1868	2.52	49.4	61.9	1.59	29.2	3376	25.1	757
102x76x5.0RHS	12.5	102	76	5.0	1594	2.22	43.5	53.7	1.41	29.7	2915	21.7	646
102x76x3.5RHS	9.07	102	76	3.5	1155	1.68	33.0	39.9	1.07	30.5	2143	16.1	468
100x50x6.0RHS	12.0	100	50	6.0	1532	1.71	34.2	45.3	0.567	19.2	1531	18.4	621
100x50x5.0RHS	10.3	100	50	5.0	1314	1.53	30.6	39.8	0.511	19.7	1346	16.1	532
100x50x4.0RHS	8.49	100	50	4.0	1081	1.31	26.1	33.4	0.441	20.2	1132	13.5	438
100x50x3.5RHS	7.53	100	50	3.5	959	1.18	23.6	29.9	0.400	20.4	1014	12.1	388
100x50x3.0RHS	6.60	100	50	3.0	841	1.06	21.3	26.7	0.361	20.7	886	10.8	329
100x50x2.5RHS	5.56	100	50	2.5	709	0.912	18.2	22.7	0.311	20.9	754	9.2	246
100x50x2.0RHS	4.50	100	50	2.0	574	0.750	15.0	18.5	0.257	21.2	616	7.4	173
100x50x1.6RHS	3.64	100	50	1.6	463	0.613	12.3	15.0	0.211	21.3	501	5.0	124
76x38x4.0RHS	6.23	76	38	4.0	793	0.527	13.9	18.1	0.176	14.9	466	7.3	321
76x38x3.0RHS	4.90	76	38	3.0	625	0.443	11.7	14.8	0.149	15.4	373	6.0	253
76x38x2.5RHS	4.15	76	38	2.5	529	0.383	10.1	12.7	0.129	15.6	320	5.1	214
75x50x6.0RHS	9.67	75	50	6.0	1232	0.800	21.3	28.1	0.421	18.5	1006	11.4	499
75x50x5.0RHS	8.35	75	50	5.0	1064	0.726	19.4	24.9	0.384	19.0	891	10.1	431
75x50x4.0RHS	6.92	75	50	4.0	881	0.630	16.8	21.1	0.335	19.5	754	8.6	357
75x50x3.0RHS	5.42	75	50	3.0	691	0.522	13.9	17.1	0.278	20.0	593	6.9	280
75x50x2.5RHS	4.58	75	50	2.5	584	0.449	12.0	14.6	0.240	20.3	505	5.9	236
75x50x2.0RHS	3.72	75	50	2.0	474	0.372	9.91	12.0	0.199	20.5	414	4.8	173
75x50x1.6RHS	3.01	75	50	1.6	383	0.305	8.14	9.75	0.164	20.7	337	3.3	124
75x25x2.5RHS	3.60	75	25	2.5	459	0.285	7.60	10.1	0.0487	10.3	144	4.1	186
75x25x2.0RHS	2.93	75	25	2.0	374	0.238	6.36	8.31	0.0414	10.5	120	3.4	133
75x25x1.6RHS	2.38	75	25	1.6	303	0.197	5.26	6.81	0.0347	10.7	99.3	2.8	92
65x35x4.0RHS	5.35	65	35	4.0	681	0.328	10.1	13.3	0.123	13.4	320	5.4	276
65x35x3.0RHS	4.25	65	35	3.0	541	0.281	8.65	11.0	0.106	14.0	259	4.5	219
65x35x2.5RHS	3.60	65	35	2.5	459	0.244	7.52	9.45	0.0926	14.2	223	3.8	186
65x35x2.0RHS	2.93	65	35	2.0	374	0.204	6.28	7.80	0.0778	14.4	184	3.2	149
50x25x3.0RHS	3.07	50	25	3.0	391	0.112	4.47	5.86	0.0367	9.7	96.4	2.4	158
50x25x2.5RHS	2.62	50	25	2.5	334	0.0989	3.95	5.11	0.0328	9.9	84.3	2.1	135
50x25x2.0RHS	2.15	50	25	2.0	274	0.0838	3.35	4.26	0.0281	10.1	70.6	1.7	111
50x25x1.6RHS	1.75	50	25	1.6	223	0.0702	2.81	3.53	0.0237	10.3	58.5	1.4	90
50x20x3.0RHS	2.83	50	20	3.0	361	0.0951	3.81	5.16	0.0212	7.7	62.0	2.1	146
50x20x2.5RHS	2.42	50	20	2.5	309	0.0847	3.39	4.51	0.0192	7.9	55.0	1.8	125
50x20x2.0RHS	1.99	50	20	2.0	254	0.0723	2.89	3.78	0.0167	8.1	46.6	1.5	103
50x20x1.6RHS	1.63	50	20	1.6	207	0.0608	2.43	3.14	0.0142	8.3	38.9	1.3	84

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

Frequently asked questions

Do RHS beams buckle laterally?: Closed sections have a very high torsion constant J, so lateral-torsional buckling rarely governs except for very deep, narrow RHS over long spans.

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.