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EN 10255 - Non-alloy Steel Tubes for Welding and Threading - Dimensions

Dimensions and weights of steel tubes according BS EN 10255.

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BS 1387:1985 has been withdrawn and replaced with the European standard EN 10255:2004 (implemented by UK national standard body as BS EN 10255:2004 "Non-alloy steel tubes suitable for welding or threading"). The table below gives the corresponding types in BS 1387 and EN 10255.

EN 10255 L
EN 10255 L1
EN 10255 L2	BS 1387 Light
EN 10255 Medium	BS 1387 Medium
EN 10255 Heavy	BS 1387 Heavy

Dimensions and weight of steel tubes according the British Standard - BS 1387:1985 "Specification for screwed and socketed steel tubes and tubulars and for plain end steel tubes suitable for welding or for screwing to BS 21 pipe threads" can be found in the table below:

For full table with Medium and Heavy Weight - rotate the screen!

Nominal bore		Outside diameter		Thickness			Weight
Nominal bore		Light	Medium/ Heavy	Light	Medium	Heavy	Light	Medium	Heavy
in	mm	mm	mm	mm	mm	mm	kg/m	kg/m	kg/m
1/4	8	13.6	13.9	1.80	2.3	2.9	0.515	0.641	0.765
3/8	10	17.1	17.4	1.80	2.3	2.9	0.670	0.839	1.020
1/2	15	21.4	21.7	2.00	2.6	3.2	0.947	1.210	1.440
3/4	20	26.9	27.2	2.30	2.6	3.2	1.380	1.560	1.870
1	25	33.8	34.2	2.60	3.2	4.0	1.980	2.410	2.940
1 1/4	32	42.5	42.9	2.60	3.2	4.0	2.540	3.100	3.800
1 1/2	40	48.4	48.8	2.90	3.2	4.0	3.230	3.570	4.380
2	50	60.2	60.8	2.90	3.6	4.5	4.080	5.030	6.190
2 1/2	65	76.0	76.6	3.20	3.6	4.5	5.710	6.430	7.930
3	80	88.7	89.5	3.20	4.0	5.0	6.720	8.370	10.300
4	100	113.9	114.9	3.60	4.5	5.4	9.750	12.200	14.500
5	125		140.6		5.0	5.4		16.600	17.900
6	150		165.1		5.0	5.4		19.700	21.300

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.

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Engineering ToolBox, (2003). EN 10255 - Non-alloy Steel Tubes for Welding and Threading - Dimensions. [online] Available at: https://www.engineeringtoolbox.com/bs1387-steel-tubes-dimensions-d_97.html [Accessed Day Mo. Year].

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