Long Welding Neck Flanges
Class 300								Unit: mm
Nominal Pipe Size	Outside Diam	Hub Diameter of Bevel	O.D. of Raised face	Thickness	Diameter	Length through Hub	Drilling Template
				if Flange Min.	of Bore		Diameter or bolt circle	Number of holes	Diameter of holes
	D	E	G	t	B	L	C		d
½	95	38	34.9	12.7	12.7	228.6	66.7	4	15.9
¾	115	48	42.9	14.3	19.1	228.6	82.6	4	19.1
1	125	54	50.8	15.9	25.4	228.6	88.9	4	19.1
1 ¼	135	64	63.5	17.5	31.8	228.6	98.4	4	19.1
1 ½	155	70	73.0	19.1	38.1	228.6	114.3	4	22.2
2	165	84	92.1	20.7	50.8	228.6	127.0	8	19.1
2 ½	190	100	104.8	23.9	63.5	228.6	149.2	8	22.2
3	210	117	127.0	27.0	76.2	228.6	168.3	8	22.2
3 ½	230	133	139.7	28.6	88.9	228.6	184.2	8	22.2
4	255	146	157.2	30.2	101.6	304.8	200.0	8	22.2
5	280	178	185.7	33.4	127.0	304.8	235.0	8	22.2
6	320	206	215.9	35.0	152.4	304.8	269.9	12	22.2
8	380	260	269.9	39.7	203.2	304.8	330.2	12	25.4
10	445	321	323.8	46.1	254.0	304.8	387.4	16	28.6
12	520	375	381.0	49.3	304.8	304.8	450.8	16	31.8
14	585	425	412.8	52.4	355.6	304.8	514.4	20	31.8
16	650	483	469.9	55.6	406.4	304.8	571.5	20	35.0
18	710	533	533.4	58.8	457.2	304.8	628.6	24	35.0
20	775	587	584.2	62.0	508.0	304.8	685.8	24	35.0
24	915	702	692.2	68.3	609.6	304.8	812.8	24	41.3
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.