CIRCULAR HOLLOW SECTIONS
M.S. Black Pipe : BS 1387:1985
British Standard Welded Steel Pipe
Thickness CLASS
Normal Size
Outside Diameter
Wall Thickness
Calculated Weight (Plain End)
Hexagon Packing
max.
min.
mm
in.
kg/m
kg/6m
pcs
D
t
Class A
15
1/2"
21.4
21.0
2.0
0.947
5.68
91
(Light)
20
3/4"
26.9
26.4
2.3
1.38
8.28
25
1"
33.8
33.2
2.6
1.98
11.88
32
1-1/4"
42.5
41.9
2.54
15.24
44
40
1-1/2"
48.4
47.8
2.9
3.23
19.38
50
2"
60.2
59.6
4.08
24.48
65
2-1/2"
76
75.2
3.2
5.71
34.26
19
80
3"
88.7
87.9
6.72
40.32
100
4"
113.9
113.0
3.6
9.75
58.50
10
Class B
21.7
21.1
1.21
7.26
(Medium)
27.2
26.6
1.56
9.36
34.2
33.4
2.41
14.46
42.9
42.1
3.10
18.60
48.8
48.0
3.57
21.42
60.8
59.8
5.03
30.18
76.6
75.4
6.43
38.58
89.5
88.1
4.0
8.37
50.22
114.9
113.3
4.5
12.2
73.20
Class C
1.44
8.64
(Heavy)
1.87
11.22
2.94
17.64
3.80
22.80
4.38
26.28
6.19
37.14
7.93
47.58
5.0
10.30
61.80
5.4
14.50
87.00
DIMENSIONS OF BLACK AND GALVANISED STEEL TUBES AS PER IS : 1239 [PART1] / 1990
NOMINAL
CLASS
OUTSIDE DIAMETER
WALL THICKNESS
PLAIN ENDS
SCREWED AND SOCKETED
BORE (NB mm) Inches
ABS
Minimum mm
Maximum mm
SWG
Kg / Mtr
Mtrs / Tonne
15 (1/2")
L
21
2
14
1056
0.956
1046
M
21.8
12
826
1.22
820
H
694
1.45
690
20 (3/4")
13
725
1.39
719
26.5
27.3
641
1.57
637
535
1.88
532
25 (1")
505
500
33.3
415
2.43
412
4
8
2.93
341
2.95
339
32 (11/4")
394
2.57
389
42
3.1
325
3.13
319
3.79
264
3.82
262
40 (11/2")
11
310
3.27
306
47.9
3.56
281
278
4.37
229
4.41
227
50 (2")
245
4.15
241
59.7
9
199
5.1
196
7
162
6.26
160
65 (21/2")
175
5.83
172
75.3
6.42
156
6.54
153
126
8.05
124
80 (3")
149
6.89
145
88
8.36
120
8.53
117
4.8
6
9.9
101
10.4
96
100 (4")
113
103
113.1
115
82
12.5
5
14.5
69
14.8
68
125 (5")
138.5
140.8
15.9
63
16.4
61
17.9
56
18.4
54
150 (6")
163.9
166.5
18.9
53
19.5
51
21.3
47
21.9
46
