Long Welding Neck Flanges
Class 150								Unit: mm
Nominal Pipe Size	Outside Diam	O.D. of Raised face	Hub Diameter of Bevel	Diameter of Bore	Thickness if Flange Min.	Length through Hub	Drilling Template
							Diameter or bolt circle	Number of holes	Diameter of holes
	D	G	E	B	t	L	C		d
½	90	34.9	30	12.7	9.6	228.6	60.3	4	15.9
¾	100	42.9	38	19.1	11.2	228.6	69.9	4	15.9
1	110	50.8	49	25.4	12.7	228.6	79.4	4	15.9
1 ¼	115	63.5	59	31.8	14.3	228.6	88.9	4	15.9
1 ½	125	73.0	65	38.1	15.9	228.6	98.4	4	15.9
2	150	92.1	78	50.8	17.5	228.6	120.7	4	19.1
2 ½	180	104.8	90	63.5	20.7	228.6	139.7	4	19.1
3	190	127.0	108	76.2	22.3	228.6	152.4	4	19.1
3 ½	215	139.7	122	88.9	22.3	228.6	177.8	8	19.1
4	230	157.2	135	101.6	22.3	304.8	190.5	8	19.1
5	255	185.7	164	127.0	22.3	304.8	215.9	8	22.2
6	280	215.9	192	152.4	23.9	304.8	241.3	8	22.2
8	345	269.9	246	203.2	27.0	304.8	298.5	8	22.2
10	405	323.8	305	254.0	28.6	304.8	362.0	12	25.4
12	485	381.0	365	304.8	30.2	304.8	431.8	12	25.4
14	535	412.8	400	355.6	33.4	304.8	476.3	12	28.6
16	595	469.9	457	406.4	35.0	304.8	539.8	16	28.6
18	635	533.4	505	457.2	38.1	304.8	577.9	16	31.8
20	700	584.2	559	508.0	41.3	304.8	635.0	20	31.8
24	815	692.2	663	609.6	46.1	304.8	749.3	20	35.0
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.