DIN 2634
WELDING NECK FLANGE NOMINAL PRESSURE 25

Pipe		Flange				Neck				Raised face		Bolts				Weight of one flange (7.85 kg/dm3)kg.
NW	d1	D	b	k	h1	d3	s	r	h2	d4	f	No.	Thread		d2
175	(191)	330	28	280	75	215	5.6	10	15	248	3	12	M24	(7/8")	27	13.4
	193.7					218
200	216	360	30	310	80	240	6.3	10	16	278	3					17.0
	219.1					244
250	267	425	32	370	88	292	7.1	12	18	335	3		M27	(1")	30	24.4
	273					298
300	318	485	34	430	92	345	8	12	18	395	4	16
	323.9					352										31.2
350	355.6	555	38	490	100	398	8	12	20	450	4		M30	(1-1/8")	33
	368															45.0
400	406.4	620	40	550	110	452	8.8	12	20	505	4
	419															58.7
500	508	730	44	660	125	558	10	12	20	615	4	20	M33	(1-1/4")	36
	521															86.1
600	609.6	845	46	770	125	660	11	12	20	720	5		M36	(1-3/8")	39
	622															101