DIN 2631 PN6

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.

 

Rated Diameter	Flange			Screws			Weight of a flange (7,85 Kg/dm3)
	D	b	k	Number	Thread	d2	Shape B
							Kg
15	95	14	65	4	M 12	14	0,72
20	105	16	75				1,01
25	115	16	85				1,23
32	140	16	100		M 16	18	1,8
40	150	16	110				2,09
50	165	18	125				2,88
65	185	18	145				3,66
80	200	20	160				4,77
100	220	20	180	8			5,65
125	250	22	210				8,42
150	285	22	240		M 20	22	10,4
200	340	24	295				16,5
250	395	26	350	12			24
300	445	26	400				30,9
350	505	26	460	16			40,6
400	565	26	515		M 24	26	49,4
500	670	28	620	20			75