Long Welding Neck Flanges
Class 1500								Unit: mm
Nominal  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	t	B	L	C		d
½	120	38	34.9	22.3	12.7	228.6	82.6	4	22.2
¾	130	44	42.9	25.4	19.1	228.6	88.9	4	22.2
1	150	52	50.8	28.6	25.4	228.6	101.6	4	25.4
1 ¼	160	64	63.5	28.6	31.8	228.6	111.1	4	25.4
1 ½	180	70	73.0	31.8	38.1	228.6	123.8	4	28.6
2	215	105	92.1	38.1	50.8	228.6	165.1	8	25.4
2 ½	245	124	104.8	41.3	63.5	304.8	190.5	8	28.6
3	265	133	127.0	47.7	76.2	304.8	203.2	8	31.8
4	310	162	157.2	54.0	101.6	304.8	241.3	8	35.0
5	375	197	185.7	73.1	127.0	304.8	292.1	8	41.3
6	395	229	215.9	82.6	152.4	304.8	317.5	12	38.1
8	485	292	269.9	92.1	203.2	304.8	393.7	12	44.5
10	385	368	323.8	108.0	254.0	406.4	482.6	12	50.8
12	675	451	381.0	123.9	304.8	406.4	571.5	16	54.0
14	750	495	412.8	133.4	355.6	To be specified by purchaser	635.0	16	60.3
16	825	552	469.9	146.1	406.4		704.8	16	66.7
18	915	597	533.4	162.0	457.2		774.7	16	73.0
20	985	641	584.2	177.8	508.0		831.8	16	79.4
24	1,170	762	692.2	203.2	609.6		990.6	16	92.1
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.