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Executive standard bs1387-1985.
steel tube is from DN8 to DN150, with three thickness: thin-walled tube, plain tube, and thickened tube
(light, medium and heavy)
BS 1387:1985 has been withdrawn and replaced with the European standard EN 10255:2004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:
| Nominal bore | Outside Diameter | Thickness | Mass | ||||||
| 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.
