DIN 2441-78 STEEL TUBES HEAVY WEIGHT FOR SUITABLE FOR SCREWING

DIN 2441-78 STEEL TUBES HEAVY WEIGHT FOR SUITABLE FOR SCREWING

1. SCOPE

This Standard applies to medium-weight tubes suitable for screwing. They are suitable for nominal pressure 2 for liquids and nominal pressure 10 for air nd non-hazardous gases.

2. Other relevant Standards

DIN 2444 Zinc coatings on steel tubes; quality standard for the hot galvanizing of steel tubes for installation purposes

DIN 2999 Part 1 Whitworth pipe threads for tubes and fittings; cylindrical internal thread and conical external

DIN 17100 Steels for general structural purposes; quality specifications

DIN 50136 Testing of metallic materials; flattenin test on tubes.

3. Dimensions, designation

Designation of a medium-weight tube suitable for screwing, nominal width 40, seamlesly gavenized(B), in manufacturing lengths:

Table 1. Threaded tube DIN 2440 – DN 40-seamless B

Nominall width Conn-
ecting
nomin-
al width
of the
flttings
according
to DIN
2950 and
DIN 2980
Whit-
worth-
pipe
threads
according
to
DIN
2999
Part1
Tube Screw thread Corresponding
socket according
to DIN 2986
Outside
diameterd1
Wall
thick-
nesss
Weight Theo-
retical
screw
thread
diameter
d2
Threads
per
25.4mm
Usable
screw
thread
length
J
min
at
a
max.
Distance of
screw thread
dlameter
d2
from tube end
Outside
diameter
Length
Plain-end
tube
kg/m
socketed
tubekg/m
a
max.
a
min.
min. min.
6 1/8 R 1/8 10.2 2.65 0.493 0.496 9.728 28 7.4 4.9 3.1 14 17
8 1/4 R 1/4 13.5 2.9 0.769 0.713 13.157 19 11.0 7.3 4.7 18.5 25
10 3/8 R 3/8 17.2 2.9 1.02 1.03 16.662 19 11.4 7.7 5.1 21.3 26
15 1/2 R 1/2 21.3 3.25 1.45 1.46 20.955 14 15.0 10.0 6.4 26.4 34
20 3/4 R 3/5 26.9 3.25 1.90 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 33.249 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 41.910 11 21.4 15.0 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 15.0 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 7.90 8.02 75.184 11 30.2 21.0 14.0 82 65
80 3 R 3 88.9 4.85 10.1 10.3 87.884 11 33.3 241 17.1 95 71
100 4 R 4 114.3 5.4 14.4 14.7 113.030 11 39.3 28.9 21.9 122 83
125 5 R 5 139.7 5.4 17.8 18.3 138.430 11 43.6 32.1 25.1 147 92
150 6 R 6 165.1 5.4 21.2 21.8 163.830 11 43.6 32.1 25.1 174 92
1) Referred to an average length of 6m

A decision with regard to the method of designation for fittings will be taken the time when the currently existing ISO Recommendations are converted to ISO Standard, due consideration being given to international practice regarding the designation of tubes suitable for screwing.

Research use only,Commercial use is prohibited .

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