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Specifications

The product is formed with high quality welded tube and advanced galvanization technology and equipment.The galvanization layer is equally galvanized and smooth finished.Both inside and outside surface are smooth,without black spot or  bleb.It features high corrosion resistance and is widely used as wire tubing under the poor condition.
GB/T3092-93 GB/T3091-93
Nominal Diameter
Outside Diameter（mm）
Wall thkckness（mm）
Wenght
（kg/m）
mm
In
Nominal Diameter
Allowed tolerance
Nominal Diameter
Allowed tolerance
15
1/2
21.3
±0.5mm
2.75
+12%
1.26
20
3/4
26.8
2.75
 
1.63
25
1
33.5
3.25
 
2.42
32
1－1/4
42.3
3.25
 
3.13
40
1－1/2
48
3.5
 
3.83
50
2
60
±1%
3.5
-15%
4.88
65
2－1/2
75.5
3.75
 
6.64
80
3
88.5
4
 
8.34
100
4
114.0
4
 
10.85
125
5
140.0
4
 
13.42
150
6
165.0
4.5
 
17.81
BS31-1940
Nominal Dia.(in)
Outside Diameter(mm)
Wall Thickness
Nominal Weight Screwed Without Coupler
Min
Std
Max
Nominal
Minmum
mm
mm
Kg/m
1/2
12.43
12.70
12.73
1.42
1.32
0.40
3/4
18.76
15.05
19.08
1.63
1.52
0.69
1
25.11
25.40
25.43
1.63
1.52
0.95
1-1/4
31.46
31.75
31.78
1.63
1.52
1.21
1-1/2
37.80
38.10
38.13
1.83
1.73
1.64
2
50.50
50.80
50.83
2.03
1.93
2.44
2-1/2
63.20
63.50
63.53
2.03
1.93
3.03