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.
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Research use only,Commercial use is prohibited .