Black steel pipes
Electric resistance welded pipes (ERW) are used as a multi-purpose item, structural steel, firefighting, network pluming, scaffolding and many other usages including gas transmission networks.
Hot dip galvanized steel pipes:
By hot dipping ERW in molten zinc a protective layer is formed to resist corrosion, giving a longer life for steel pipes. The HDG pipe are used for potable water transmission networks, structural pipe for outdoors like fencing, handrails, scaffolding, riser pipes and many other applications for both indoors and outdoors.
Medium and heavy series are available from these standard galvanized and black pipes which are suitable for cold and hot water lines, firefighting, HVAC lines and electric poles. Pipes are galvanized according to DIN 2444
DIN 2440
Nominal width |
Nominal width of associated fittings acc.to DIN 2950 and DIN 2980 Inch |
WhitWorth pipe thread acc. DIN 2999 |
Tube |
Thread |
Companion Socket According to DIN 2986 |
Outside diameter d |
wall thickness a |
Weight of plain tube Kg/m |
Weight of tube including socket Kg/m |
Theoretical thread diameter d |
Thread Per Inch |
Useful thread Length d min.for a max. |
Distance of thread diameter d from tube and |
Outside diameter min. |
Length min. |
a max. |
a min. |
15 |
1/2 |
R 1/2" |
21.3 |
2.65 |
1.22 |
1.23 |
20.955 |
14 |
15 |
10 |
6.4 |
26.4 |
34 |
20 |
2/4 |
R 3/4" |
26.9 |
2.65 |
1.58 |
1.59 |
26.441 |
14 |
16.3 |
11.3 |
7.7 |
31.8 |
36 |
25 |
1 |
R 1" |
33.7 |
3.25 |
2.44 |
2.46 |
33.294 |
11 |
19.1 |
12.7 |
8.1 |
39.5 |
43 |
32 |
1 1/4 |
R 1 1/4" |
42.4 |
3.25 |
3.14 |
3.17 |
41.91 |
11 |
21.4 |
15 |
10.4 |
48.3 |
48 |
40 |
1 1/2 |
R 1 1/2" |
48.3 |
3.25 |
3.61 |
3.65 |
47.803 |
11 |
21.4 |
15 |
10.4 |
54.5 |
48 |
50 |
2 |
R 2" |
60.3 |
3.65 |
5.1 |
5.17 |
59.614 |
11 |
25.7 |
18.2 |
13.6 |
66.3 |
56 |
65 |
2 1/2 |
R 2 1/2 |
76.1 |
3.65 |
6.51 |
6.63 |
75.184 |
11 |
30.2 |
21 |
14 |
82 |
65 |
80 |
3 |
R 3 |
88.9 |
4.05 |
8.47 |
8.64 |
87.884 |
11 |
33.3 |
24.1 |
17.1 |
95 |
71 |
100 |
4 |
R 4 |
114.3 |
4.5 |
12.1 |
12.4 |
113.03 |
11 |
39.3 |
28.9 |
21.9 |
122 |
83 |
125 |
5 |
R 5 |
139.7 |
4.85 |
16.2 |
16.7 |
138.43 |
11 |
43.6 |
32.1 |
25.1 |
147 |
92 |
150 |
6 |
R 6 |
165.1 |
4.85 |
19.2 |
19.8 |
163.83 |
11 |
43.6 |
32.1 |
25.1 |
174 |
92 |
DIN 2441
Nominal width |
Nominal width of associated fittings acc.to DIN 2950 and DIN 2980 Inch |
WhitWorth pipe thread acc. DIN 2999 |
Tube |
Thread |
Companion Socket According to DIN 2986 |
Outside diameter d |
wall thickness s |
Weight of plain tube Kg/m |
Weight of tube including socket Kg/m |
Theoretical thread diameter d |
Thread Per Inch |
Useful thread Length d min.for a max. |
Distance of thread diameter d from tube end |
Outside diameter min. |
Length min. |
a max. |
a min. |
15 |
1/2 |
R 1/2" |
21.3 |
3.25 |
1.45 |
1.46 |
20.955 |
14 |
15 |
10 |
6.4 |
26.4 |
34 |
20 |
2/4 |
R 3/4" |
26.9 |
3.25 |
1.9 |
1.91 |
26.441 |
14 |
16.3 |
11.3 |
7.7 |
31.8 |
36 |
25 |
1 |
R 1" |
33.7 |
4.05 |
2.97 |
2.99 |
33.294 |
11 |
19.1 |
12.7 |
8.1 |
39.5 |
43 |
32 |
1 1/4 |
R 1 1/4" |
42.4 |
4.05 |
3.84 |
3.87 |
41.91 |
11 |
21.4 |
15 |
10.4 |
48.3 |
48 |
40 |
1 1/2 |
R 1 1/2" |
48.3 |
4.05 |
4.43 |
4.47 |
47.803 |
11 |
21.4 |
15 |
10.4 |
54.5 |
48 |
50 |
2 |
R 2" |
60.3 |
4.5 |
6.17 |
6.24 |
59.614 |
11 |
25.7 |
18.2 |
13.6 |
66.3 |
56 |
65 |
2 1/2 |
R 2 1/2 |
76.1 |
4.5 |
7.9 |
8.02 |
75.184 |
11 |
30.2 |
21 |
14 |
82 |
65 |
80 |
3 |
R 3 |
88.9 |
4.85 |
10.1 |
10.3 |
87.884 |
11 |
33.3 |
24.1 |
17.1 |
95 |
71 |
100 |
4 |
R 4 |
114.3 |
5.4 |
14.4 |
14.7 |
113.03 |
11 |
39.3 |
28.9 |
21.9 |
122 |
83 |
125 |
5 |
R 5 |
139.7 |
5.4 |
17.8 |
18.3 |
138.43 |
11 |
43.6 |
32.1 |
25.1 |
147 |
92 |
150 |
6 |
R 6 |
165.1 |
5.4 |
21.2 |
21.8 |
163.83 |
11 |
43.6 |
32.1 |
25.1 |
174 |
92 |
Thread Height Dimensions
Thread Element |
28 Threads per inch |
19 Threads per inch |
14 threads per inch |
11 Threads per inch |
p 0.03571 |
p 0.05263 |
p 0.07143 |
p 0.09091 |
H 0 960237p |
0.0343 |
0.0505 |
0.0686 |
0.0873 |
h 0 640327p |
0.0229 |
0.0337 |
0.0457 |
0.0582 |
r 0 137278p |
0.0049 |
0.0072 |
0.0098 |
0.0125 |