Properties - Cold-Formed Square Hollow Sections

Welcome to our Cold-Formed Square Hollow Section properties page! Here you'll find properties for all UK Cold-Formed Square Hollow Section steel sections described by the Steelwork Design Guide to BS5950-1:2000, Volume 1, Section Properties, Member Capacities, 7th Edition (also known as The Blue Book). Sort the table below according to any property and select a CAD file to download using the reference links in the left-most column.

You can also purchase all our CAD data in one easy download, containing the shapes as individual files or AutoCAD Design Center files! Click here to visit our Shop.

Section Reference	Ratio for Local Buckling	Second Moment of Area	Radius of Gyration	Elastic Modulus	Plastic Modulus	Torsional Constants		Surface Area
								Per Metre	Per Tonne
	d/t⁽¹⁾	I cm⁴	r cm	Z cm³	S cm³	J cm⁴	C cm³	m²	m²
25x25x2.0	7.5	1.48	0.924	1.19	1.47	2.53	1.8	0.093	68.3
25x25x2.5	5	1.69	0.899	1.35	1.71	2.97	2.07	0.091	55.7
25x25x3.0	3.33	1.84	0.874	1.47	1.91	3.33	2.27	0.09	47.4
30x30x2.5	7	3.16	1.1	2.1	2.61	5.4	3.2	0.111	54.8
30x30x3.0	5	3.5	1.08	2.34	2.96	6.15	3.58	0.11	46.5
40x40x2.0	15	6.94	1.54	3.47	4.13	11.3	5.23	0.153	66.4
40x40x2.5	11	8.22	1.51	4.11	4.97	13.6	6.21	0.151	53.7
40x40x3.0	8.33	9.32	1.49	4.66	5.72	15.8	7.07	0.15	45.3
40x40x4.0	5	11.1	1.44	5.54	7.01	19.4	8.48	0.146	34.8
50x50x2.5	15	16.9	1.92	6.78	8.07	27.5	10.2	0.191	53.1
50x50x3.0	11.7	19.5	1.9	7.79	9.39	32.1	11.8	0.19	44.7
50x50x4.0	7.5	23.7	1.85	9.49	11.7	40.4	14.4	0.186	34.2
50x50x5.0	5	27	1.8	10.8	13.7	47.5	16.6	0.183	27.9
60x60x3.0	15	35.1	2.31	11.7	14	57.1	17.7	0.23	44.3
60x60x4.0	10	43.6	2.26	14.5	17.6	72.6	22	0.226	33.7
60x60x5.0	7	50.5	2.21	16.8	20.9	86.4	25.6	0.223	27.4
70x70x2.5	23	49.4	2.74	14.1	16.5	78.5	21.2	0.271	52.5
70x70x3.0	18.3	57.5	2.71	16.4	19.4	92.4	24.7	0.27	44
70x70x3.5	15	65.1	2.69	18.6	22.2	106	28	0.268	38
70x70x4.0	12.5	72.1	2.67	20.6	24.8	119	31.1	0.266	33.4
70x70x5.0	9	84.6	2.62	24.2	29.6	142	36.7	0.263	27.1
80x80x3.0	21.7	87.8	3.12	22	25.8	140	33	0.31	43.8
80x80x3.5	17.9	99.8	3.1	25	29.5	161	37.6	0.308	37.7
80x80x4.0	15	111	3.07	27.8	33.1	180	41.8	0.306	33.2
80x80x5.0	11	131	3.03	32.9	39.7	218	49.7	0.303	26.9
80x80x6.0	8.33	149	2.98	37.3	45.8	252	56.6	0.299	22.7
90x90x3.0	25	127	3.53	28.3	33	201	42.5	0.35	43.6
90x90x3.5	20.7	145	3.51	32.2	37.9	232	48.5	0.348	37.6
90x90x4.0	17.5	162	3.48	36	42.6	261	54.2	0.346	33
90x90x5.0	13	193	3.43	42.9	51.4	316	64.7	0.343	26.7
90x90x6.0	10	220	3.39	49	59.5	368	74.2	0.339	22.5
100x100x3.0	28.3	177	3.94	35.4	41.2	279	53.2	0.39	43.5
100x100x4.0	20	226	3.89	45.3	53.3	362	68.1	0.386	32.9
100x100x5.0	15	271	3.84	54.2	64.6	441	81.7	0.383	26.6
100x100x6.0	11.7	311	3.79	62.3	75.1	514	94.1	0.379	22.3
100x100x8.0	7.5	366	3.67	73.2	91.1	645	114	0.366	17.1
120x120x4.0	25	402	4.71	67	78.3	637	101	0.466	32.7
120x120x5.0	19	485	4.66	80.9	95.4	778	122	0.463	26.4
120x120x6.0	15	562	4.61	93.7	112	913	141	0.459	22.1
120x120x8.0	10	677	4.49	113	138	1160	175	0.446	16.9
120x120x10.0	7	777	4.38	129	162	1380	203	0.437	13.7
140x140x4.0	30	652	5.52	93.1	108	1020	140	0.546	32.6
140x140x5.0	23	791	5.48	113	132	1260	170	0.543	26.2
140x140x6.0	18.3	920	5.43	131	155	1480	198	0.539	22
140x140x8.0	12.5	1130	5.3	161	194	1900	248	0.526	16.7
140x140x10.0	9	1310	5.2	187	230	2270	291	0.517	13.6
150x150x4.0	32.5	808	5.93	108	125	1270	162	0.586	32.5
150x150x5.0	25	982	5.89	131	153	1550	197	0.583	26.2
150x150x6.0	20	1150	5.84	153	180	1830	230	0.579	21.9
150x150x8.0	13.8	1410	5.71	188	226	2360	289	0.566	16.7
150x150x10.0	10	1650	5.61	220	269	2840	341	0.557	13.5
160x160x4.0	35	987	6.34	123	143	1540	185	0.626	32.5
160x160x5.0	27	1200	6.29	150	175	1900	226	0.623	26.1
160x160x6.0	21.7	1410	6.25	176	206	2240	264	0.619	21.9
160x160x8.0	15	1740	6.12	218	260	2900	334	0.606	16.6
160x160x10.0	11	2050	6.02	256	311	3490	395	0.597	13.4
180x180x5.0	31	1740	7.11	193	224	2720	290	0.703	26.1
180x180x6.0	25	2040	7.06	226	264	3220	340	0.699	21.8
180x180x8.0	17.5	2550	6.94	283	336	4190	432	0.686	16.5
180x180x10.0	13	3020	6.84	335	404	5070	515	0.677	13.4
180x180x12.0	10	3320	6.68	369	454	5870	584	0.658	11.3
180x180x12.5	9.4	3410	6.65	378	467	6050	600	0.656	10.8
200x200x5.0	35	2410	7.93	241	279	3760	362	0.783	26
200x200x6.0	28.3	2830	7.88	283	330	4460	426	0.779	21.8
200x200x8.0	20	3570	7.76	357	421	5820	544	0.766	16.5
200x200x10.0	15	4250	7.65	425	508	7070	651	0.757	13.3
200x200x12.0	11.7	4730	7.5	473	576	8230	743	0.738	11.2
200x200x12.5	11	4860	7.47	486	594	8500	765	0.736	10.8
250x250x6.0	36.7	5670	9.92	454	524	8840	681	0.979	21.6
250x250x8.0	26.3	7230	9.8	578	676	11600	878	0.966	16.3
250x250x10.0	20	8710	9.7	697	822	14200	1060	0.957	13.2
250x250x12.0	15.8	9860	9.55	789	944	16700	1230	0.938	11.1
250x250x12.5	15	10200	9.52	813	975	17300	1270	0.936	10.6
300x300x6.0	45	9960	12	664	764	15400	997	1.18	21.6
300x300x8.0	32.5	12800	11.8	853	991	20300	1290	1.17	16.3
300x300x10.0	25	15500	11.7	1040	1210	25000	1570	1.16	13.1
300x300x12.0	20	17800	11.6	1180	1400	29500	1830	1.14	11
300x300x12.5	19	18300	11.6	1220	1450	30600	1890	1.14	10.6
350x350x8.0	38.8	20700	13.9	1180	1370	32600	1790	1.37	16.2
350x350x10.0	30	25200	13.8	1440	1680	40100	2180	1.36	13
350x350x12.0	24.2	29100	13.6	1660	1950	47600	2550	1.34	10.9
350x350x12.5	23	30000	13.6	1720	2020	49400	2640	1.34	10.5
400x400x8.0	45	31300	15.9	1560	1800	48900	2360	1.57	16.2
400x400x10.0	35	38200	15.8	1910	2210	60400	2890	1.56	13
400x400x12.0	28.3	44300	15.7	2220	2590	71800	3400	1.54	10.9
400x400x12.5	27	45900	15.7	2290	2680	74600	3520	1.54	10.5