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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      BS 1387:1985 has been withdrawn and replaced with the European standard EN 10255:2004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.

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