Curcular Hollow Section

Sectional Outer Diameter d mm	Designation Thickness t mm	Mass per Metre kg/m	Area of Section A cm2	Ratio for Local Buckling d/t	Second Moment of Area I cm4	Radius of Gyration i	Elastic Modulus W el cm3	Plastic Modulus W pl cm3	Torsional Constants I T cm4	Torsional Constants W t cm3	Surface Area Per Metre m2	Surface Area Per Tonne m2
88.9	3	6.36	8.1	29.6	74.8	3.04	16.8	22.1	150	33.6	0.279	43.8
88.9	4	8.38	10.7	22.2	96.3	3	21.7	28.9	193	43.3	0.279	33.2
88.9	5	10.3	13.2	17.8	116	2.97	26.2	35.2	233	52.4	0.279	27
114.3	3.5	9.56	12.2	32.7	187	3.92	32.7	43	374	65.5	0.359	37.7
114.3	5	13.5	17.2	22.9	257	3.87	45	59.8	514	89.9	0.359	26.6
114.3	6	16	20.4	19.1	300	3.83	52.5	70.4	600	105	0.359	22.4
139.7	5	16.6	21.2	27.9	481	4.77	68.8	90.8	961	138	0.439	26.4
139.7	6	19.8	25.2	23.3	564	4.73	80.8	107	1130	162	0.439	22.2
139.7	8	26	33.1	17.5	720	4.66	103	139	1440	206	0.439	16.9
139.7	10	32	40.7	14	862	4.6	123	169	1720	247	0.439	13.7
168.3	5	20.1	25.7	33.7	856	5.78	102	133	1710	203	0.529	26.3
168.3	6	24	30.6	28.1	1010	5.74	120	158	2020	240	0.529	22
168.3	8	31.6	40.3	21	1300	5.67	154	206	2600	308	0.529	16.7
168.3	10	39	49.7	16.8	1560	5.61	186	251	3130	372	0.529	13.5
168.3	12.5	48	61.2	13.5	1870	5.53	222	304	3740	444	0.529	11
193.7	5	23.3	29.6	38.7	1320	6.67	136	178	2640	273	0.609	26.2
193.7	6	27.8	35.4	32.3	1560	6.64	161	211	3120	322	0.609	21.9
193.7	8	36.6	46.7	24.2	2020	6.57	208	276	4030	416	0.609	16.6
193.7	10	45.3	57.7	19.4	2440	6.5	252	338	4880	504	0.609	13.5
193.7	12.5	55.9	71.2	15.5	2930	6.42	303	411	5870	606	0.609	10.9
219.1	5	26.4	33.6	43.8	1930	7.57	176	229	3860	352	0.688	26.1
219.1	6	31.5	40.2	36.5	2280	7.54	208	273	4560	417	0.688	21.8
219.1	8	41.6	53.1	27.4	2960	7.47	270	357	5920	540	0.688	16.5
219.1	10	51.6	65.7	21.9	3600	7.4	328	438	7200	657	0.688	13.3
219.1	12.5	63.7	81.1	17.5	4350	7.32	397	534	8690	793	0.688	10.8
219.1	16	80.1	102	13.7	5300	7.2	483	661	10600	967	0.688	8.6
244.5	5	29.5	37.6	48.9	2700	8.47	221	287	5400	441	0.768	26
244.5	6	35.3	45	40.8	3200	8.43	262	341	6400	523	0.768	21.7
244.5	8	46.7	59.4	30.6	4160	8.37	340	448	8320	681	0.768	16.4

Sectional Outer Diameter d mm	Designation Thickness t mm	Mass per Metre kg/m	Area of Section A cm2	Ratio for Local Buckling d/t	Second Moment of Area I cm4	Radius of Gyration i	Elastic Modulus W el cm3	Plastic Modulus W pl cm3	Torsional Constants I T cm4	Torsional Constants W t cm3	Surface Area Per Metre m2	Surface Area Per Tonne m2
244.5	10	57.8	73.7	24.5	5070	8.3	415	550	10100	830	0.768	13.3
244.5	12.5	71.5	91.1	19.6	6150	8.21	503	673	12300	1010	0.768	10.8
244.5	16	90.2	115	15.3	7530	8.1	616	837	15100	1230	0.768	8.52
273	5	33	42.1	54.6	3780	9.48	277	359	7560	554	0.858	26
273	6	39.5	50.3	45.5	4490	9.44	329	428	8970	657	0.858	21.7
273	8	52.3	66.6	34.1	5850	9.37	429	562	11700	857	0.858	16.4
273	10	64.9	82.6	27.3	7150	9.31	524	692	14300	1050	0.858	13.2
273	12.5	80.3	102	21.8	8700	9.22	637	849	17400	1270	0.858	10.7
273	16	101	129	17.1	10700	9.1	784	1060	21400	1570	0.858	8.46
323.9	5	39.3	50.1	64.8	6370	11.3	393	509	12700	787	1.02	25.9
323.9	6	47	59.9	54	7570	11.2	468	606	15100	935	1.02	21.7
323.9	8	62.3	79.4	40.5	9910	11.2	612	799	19800	1220	1.02	16.3
323.9	10	77.4	98.6	32.4	12200	11.1	751	986	24300	1500	1.02	13.2
323.9	12.5	96	122	25.9	14800	11	917	1210	29700	1830	1.02	10.6
323.9	16	121	155	20.2	18400	10.9	1140	1520	36800	2270	1.02	8.39
355.6	8	68.6	87.4	44.5	13200	12.3	742	967	26400	1490	1.12	16.4
355.6	10	85.2	109	35.6	16200	12.2	912	1200	32400	1830	1.12	13.1
355.6	12.5	106	135	28.4	19900	12.1	1120	1470	39700	2230	1.12	10.6
355.6	16	134	171	22.2	24700	12	1390	1850	49300	2770	1.12	8.36
406.4	8	78.6	100	50.8	19900	14.1	978	1270	39700	1960	1.28	16.3
406.4	10	97.8	125	40.6	24500	14	1210	1570	49000	2410	1.28	13.1
406.4	12.5	121	155	32.5	30000	13.9	1480	1940	60100	2960	1.28	10.5
406.4	16	154	196	25.4	37400	13.8	1840	2440	74900	3690	1.28	8.31
457	8	88.6	113	57.1	28400	15.9	1250	1610	56900	2490	1.44	16.3
457	10	110	140	45.7	35100	15.8	1540	2000	70200	3070	1.44	13.1
457	12.5	137	175	36.6	43100	15.7	1890	2470	86300	3780	1.44	10.5
457	16	174	222	28.6	54000	15.6	2360	3110	108000	4720	1.44	8.28
508	8	98.6	126	63.5	39300	17.7	1550	2000	78600	3090	1.6	16.2
508	10	123	156	50.8	48500	17.6	1910	2480	97000	3820	1.6	13