Long Welding Neck Flanges
Class 600								Unit: mm
Nomnal Pipe Size	Outside Diam	Hub Diameter of Bevel	O.D. of Raised face	Thickness if Flange Min.	Diameter of Bore	Length through Hub	Drilling
							Diameter or bolt circle	Number of holes	Diameter of holes
	D	E	G	B	t	L	C		d
½	95	38	34.9	12.7	14.3	228.6	66.7	4	15.9
¾	115	48	42.9	19.1	15.9	228.6	82.6	4	19.1
1	125	54	50.8	25.4	17.5	228.6	88.9	4	19.1
1 ¼	135	64	63.5	31.8	20.7	228.6	98.4	4	19.1
1 ½	155	70	73.0	38.1	22.3	228.6	114.3	4	22.2
2	165	84	92.1	50.8	25.4	228.6	127.0	8	19.1
2 ½	190	100	104.8	63.5	28.6	228.6	149.2	8	22.2
3	210	117	127.0	76.2	31.8	228.6	168.3	8	22.2
3 ½	230	133	139.7	88.9	35.0	228.6	184.2	8	25.4
4	275	152	157.2	101.6	38.1	304.8	215.9	8	25.4
5	330	189	185.7	127.0	44.5	304.8	266.7	8	28.6
6	355	222	215.9	152.4	47.7	304.8	292.1	12	28.6
8	420	273	269.9	203.2	55.6	304.8	349.2	12	31.8
10	510	343	323.8	254.0	63.5	304.8	431.8	16	35.0
12	560	400	381.0	304.8	66.7	304.8	489.0	20	35.0
14	605	432	412.8	355.6	69.9	304.8	527.0	20	38.1
16	685	495	469.9	406.4	76.2	304.8	603.2	20	41.3
18	745	546	533.4	457.2	82.6	304.8	654.0	20	44.5
20	815	610	584.2	508	88.9	304.8	723.9	24	44.5
24	940	718	692.2	609.6	101.6	304.8	838.2	24	50.8
Notes:
(1) Bore (B) is the same as nominal pipe size.
(2) Welding Necks longer than listed are available in all sizes on special order.