Steel Tubes according BS 1387
Dimensions and weights of steel tubes according British Standard - BS - 1387:1985
Dimensions and weight of steel tubes according the British Standard - BS - 1387:1985 can be
found in the table below:
Nominal bore		Outside diameter		Thickness			Mass
		Light	Medium/	Light	Medium	Heavy	Light	Medium	Heavy
			Heavy
in	mm	mm	mm	mm	mm	mm	kg/m	kg/m	kg/m
1/4"	8	13.6	13.9	1.8	2.3	2.9	0.515	0.641	0.765
1/8"	10	17.1	17.4	1.8	2.3	2.9	0.67	0.839	1.02
1/2"	15	21.4	21.7	2	2.6	3.2	0.947	1.21	1.44
3/4"	20	26.9	27.2	2.3	2.6	3.2	1.38	1.56	1.87
1	25	33.8	34.2	2.6	3.2	4	1.98	2.41	2.94
1 1/4	32	42.5	42.9	2.6	3.2	4	2.54	3.1	3.8
1 1/2	40	48.4	48.8	2.9	3.2	4	3.23	3.57	4.38
2	50	60.2	60.8	2.9	3.6	4.5	4.08	5.03	6.19
2 1/2	65	76	76.6	3.2	3.6	4.5	5.71	6.43	7.93
3	80	88.7	89.5	3.2	4	5	6.72	8.37	10.3
4	100	113.9	114.9	3.6	4.5	5.4	9.75	12.2	14.5
5	125		140.6		5	5.4		16.6	17.9
6	150		166.1		5	5.4		19.7	21.3
The standard is applicable to tubes of nominal size DN8 to DN150 in light, medium and heavy thickness.
The BS 1387:1985 specification for screwed and socket steel tubes and for plain end steel tubes suitable for
welding or for screwing to BS 21 pipe threads.