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Indian Standard IS: 1161-1998

Steel Tubes For Structural Purposes Conforming to IS : 1161 - 1998

NB and Series	Outside Diameter	Thickness	Nominal weight of Black tubes plain end		Area of Cross-Section	Moment Of Inertia	Modulus Of Section	Radius of Gyration
mm	mm	mm	Kg/m	M/ton	cm	cm4	cm³	cm
15L	21.3	2.00	0.947	1056	1.21	0.57	0.54	0.69
M		2.60	1.21	826	1.53	0.69	0.64	0.66
H		3.20	1.44	694	1.82	0.75	0.70	0.55

20L	26.9	2.30	1.38	725	1.78	1.36	1.01	0.87
M		2.60	1.56	641	1.98	1.48	1.10	0.86
H		3.20	1.87	535	2.38	1.70	1.26	0.84

25L	33.7	2.60	1.98	505	2.54	3.09	1.83	1.10
M		3.20	2.41	415	3.06	3.61	2.14	1.08
H		4.00	2.93	341	3.73	4.19	2.48	1.05

32L	42.4	2.60	2.54	394	3.25	6.47	3.05	1.41
M		3.20	3.10	323	3.94	7.62	3.59	1.39
H		4.00	3.79	264	4.82	8.99	4.24	1.36

40L	48.3	2.90	3.23	310	4.13	10.70	4.43	1.61
M		3.20	3.56	281	4.53	11.59	4.80	1.59
H		4.00	4.37	229	4.56	13.77	5.70	1.57

50L	60.3	2.90	4.08	245	5.23	21.59	7.16	2.03
M		3.60	5.03	199	6.41	25.88	8.58	2.00
H		4.50	6.19	162	7.88	30.90	10.20	1.98

65L	76.1	3.20	5.71	175	7.32	48.79	12.82	2.58
M		3.60	6.42	156	8.20	54.02	14.20	2.57
H		4.50	7.93	126	10.1	65.12	17.10	2.54

80L	88.9	3.20	6.72	149	8.61	79.23	17.82	3.03
M		4.00	8.36	120	10.7	96.36	21.68	3.00
H		4.80	9.90	101	12.7	112.52	25.31	2.98

90L	101.6	3.60	8.70	115	11.1	133.27	26.23	3.47
M		4.00	9.63	104	12.3	146.32	28.80	3.45
H		4.80	11.50	87	14.6	171.44	33.75	3.43

100L	114.3	3.60	9.75	103	12.5	192.03	33.60	3.92
M		4.50	12.20	82	15.5	234.30	41.00	3.89
H		5.40	14.50	69	18.5	274.50	48.00	3.85

110L	127.0	4.50	13.60	74	17.3	325.30	51.20	4.33
M		4.80	14.50	69	18.4	344.58	54.27	4.32
H		5.40	16.20	62	20.6	382.00	60.20	4.30

125L	139.7	4.50	15.00	67	19.1	437.20	62.60	4.78
M		4.80	15.90	63	20.3	463.44	66.35	4.77
H		5.40	17.90	56	20.6	514.50	73.70	4.75

135L	152.4	4.50	16.40	61	20.9	572.20	75.10	5.23
M		4.80	17.50	57	22.2	606.92	79.55	5.22
H		5.40	19.60	51	25.0	674.50	88.50	5.20

150L	165.1	4.50	17.80	56	22.7	732.60	88.70	5.68
M		4.80	18.90	53	24.2	777.32	94.16	5.67
H		5.40	21.30	47	27.10	864.70	105.0	5.65

150L	168.3	4.50	18.20	55	23.1	777.20	92.40	5.79
M		4.80	19.40	52	24.7	824.78	98.01	5.78
H1		5.40	21.70	46	27.6	917.70	109.00	5.76
H2		6.30	25.20	40	32.0	1053.00	125.00	5.73

175L	193.7	4.80	22.40	45	28.5	1271.71	131.11	6.68
M		5.40	25.10	40	32.0	1417.00	146.00	6.66
H		5.90	27.30	37	34.8	1535.20	158.65	6.64

200L	219.1	4.80	25.40	39	32.3	1856.51	169.47	7.58
M		5.60	29.50	34	37.5	2141.0	195.00	7.55
H		5.90	31.00	32	39.5	2247.0	205.00	7.54

250H	273.0	5.90	38.90	26	49.5	4412.0	323.00	9.45
300H	323.9	6.30	49.30	20	62.8	7992.0	493.0	11.2

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