DIN 2634 PN25

The Welding neck flanges is normally referred to as the high hub flange. It is designed to transfer stresses to the pipe, thereby reducing high stress concentrations at the base of the flange.

The welding neck flange is the best designed butt-welded flange of those currently available because of its inherent structural value. It is expensive because of the design.

DIN 2634 PN25 DIN 2634 PN25
PipeFlangeNeckRaised faceScrewsWeight of a flange
(7,85 Kg/dm3)
Rated
Diameter
d1Dbkh1d3srh2d4fNumberThreadd2Kg
ISO Series 1DIN Series 2
15-2095166538302464524M 12140,746
21,3-32
20-25105187540382,3465824M 12141,06
26,9-40
25-30115188540422,6466824M 12141,29
33,7-45
32-381401810042522,6667824M 16181,88
42,4-56
40-44,51501811045602,6678834M 16182,33
48,3-64
50-571652012548722,96810234M 16182,82
60,3-75
6576,1-1852214552902,961012238M 16183,74
8088,9-20024160581053,281213838M 16184,75
100-10823524190651283,681216238M 20226,52
114,3-134
125-1332702622068155481218838M 24269,07
139,7-162
150-15930028250751824,5101221838M 242611,8
168,3-192
(175)193,7-35028280752185,61015248312M 242613,4
200219,1-36030310802446,31016278312M 242617
250-26742532370882927,11218335312M 273024,4
273-298
300323,9-485344309235281218395416M 273031,2
350355,6-5553849010039881220450416M 303347,2
-36844,2
400406,4-620405501104528,81220505416M 333661,7
-41957,9
(450)457-670426001105008,81220550420M 333671,9
500508-73044660125558101220615420M 333689,6
600610-84546770125660111220720520M 3639104
700711-96046875125760132024820524M 3942136
800813-108550990135865142224930524M 4548186
900914-11855410901459681624281030528M 4548236
10001016-132058121015510701824281140528M 5256307

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