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Weld Neck Flange

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Weld Neck Flanges are available in the following specifications:
Size	1/2"NB to 56"NB
Class	150#, 300#, 3000#, 6000#, 9000#
Sch (Schedule)	XS, XXS, STD & Schedule 20, 40, 80, 160
Pressure Ratings	PN 1 - PN 400
Stainless Steel Weld Neck Flanges	ASTM A 182 F - 304 / 304H / 304L / 316 / 316H / 316L / 316Ti, 309, 310, 317L, 321, 347, 904L
Duplex Steel Weld Neck Flanges	ASTM A 182 - F 51, F 53, F 55
Alloy Steel Weld Neck Flanges	ASTM A 182 - F5, F9, F11, F21, F22 & F91
Carbon Steel Weld Neck Flanges	ASTM A 105
Low Temp. Carbon Steel Flanges (LTCS Weld Neck Flanges)	A 350 LF2
Cupro Nickel (Cu-Ni) Weld Neck Flanges	C70600, 90/10, C71500, 70/30, C71640
Nickel Weld Neck Flanges	UNS N02200, UNS N02201
Monel Weld Neck Flanges	UNS N04400, UNS N05500, Alloy 20
Inconel Weld Neck Flanges	UNS N06600, UNS N06601, UNS N06625, UNS N08800, UNS N08810, UNS N08825
Hastelloy Weld Neck Flanges	UNS N10276, UNS N06022, UNS N10665, UNS N06455
Titanium Weld Neck Flanges	Gr. 1, Gr. 2, Gr. 3, DTH 3.7035, DTH 3.7055
Other Services	Hot Dip Galvanized (GI) Weld Neck Flanges Sand Blasting on Weld Neck Flanges Shot Peening on Weld Neck Flanges Epoxy Coating on Weld Neck Flanges FBE Coating on Weld Neck Flanges

Class 150 Weld Neck Flange Dimensions as per ASME B16.5

Size in Inch	Size in mm	Outer Diameter	Flange Thickness	Hub OD	Weld Neck OD	Welding Neck Length	Bore	RF Diameter	RF Height	PCD	Weld Face
		A	B	C	D	E	F	G	H	I	J
1/2	15	90	9.6	30	21.3	46	According to Schedule	34.9	2	60.3	1.6
3/4	20	100	11.2	38	26.7	51		42.9	2	69.9	1.6
1	25	110	12.7	49	33.4	54		50.8	2	79.4	1.6
1 1/4	32	115	14.3	59	42.2	56		63.5	2	88.9	1.6
1 1/2	40	125	15.9	65	48.3	60		73	2	98.4	1.6
2	50	150	17.5	78	60.3	62		92.1	2	120.7	1.6
2 1/2	65	180	20.7	90	73	68		104.8	2	139.7	1.6
3	80	190	22.3	108	88.9	68		127	2	152.4	1.6
3 1/2	90	215	22.3	122	101.6	70		139.7	2	177.8	1.6
4	100	230	22.3	135	114.3	75		157.2	2	190.5	1.6
5	125	255	22.3	164	141.3	87		185.7	2	215.9	1.6
6	150	280	23.9	192	168.3	87		215.9	2	241.3	1.6
8	200	345	27	246	219.1	100		269.9	2	298.5	1.6
10	250	405	28.6	305	273	100		323.8	2	362	1.6
12	300	485	30.2	365	323.8	113		381	2	431.8	1.6
14	350	535	33.4	400	355.6	125		412.8	2	476.3	1.6
16	400	595	35	457	406.4	125		469.9	2	539.8	1.6
18	450	635	38.1	505	457.2	138		533.4	2	577.9	1.6
20	500	700	41.3	559	508	143		584.2	2	635	1.6
24	600	815	46.1	663	610	151		692.2	2	749.3	1.6

Class 300 Weld Neck Flange Dimensions as per ASME B16.5

Size in Inch	Size in mm	Outer Diameter	Flange Thickness	Hub OD	Weld Neck OD	Welding Neck Length	Bore	RF Diameter	RF Height	PCD	Weld Face
		A	B	C	D	E	F	G	H	I	J
1/2	15	95	12.7	38	21.3	51	According to Schedule	34.9	2	66.7	1.6
3/4	20	115	14.3	48	26.7	56		42.9	2	82.6	1.6
1	25	125	15.9	54	33.4	60		50.8	2	88.9	1.6
1 1/4	32	135	17.5	64	42.2	64		63.5	2	98.4	1.6
1 1/2	40	155	19.1	70	48.3	67		73	2	114.3	1.6
2	50	165	20.7	84	60.3	68		92.1	2	127	1.6
2 1/2	65	190	23.9	100	73	75		104.8	2	149.2	1.6
3	80	210	27	117	88.9	78		127	2	168.3	1.6
3 1/2	90	230	28.6	133	101.6	79		139.7	2	184.2	1.6
4	100	255	30.2	146	114.3	84		157.2	2	200	1.6
5	125	280	33.4	178	141.3	97		185.7	2	235	1.6
6	150	320	35	206	168.3	97		215.9	2	269.9	1.6
8	200	380	39.7	260	219.1	110		269.9	2	330.2	1.6
10	250	445	46.1	321	273	116		323.8	2	387.4	1.6
12	300	520	49.3	375	323.8	129		381	2	450.8	1.6
14	350	585	52.4	425	355.6	141		412.8	2	514.4	1.6
16	400	650	55.6	483	406.4	144		469.9	2	571.5	1.6
18	450	710	58.8	533	457	157		533.4	2	628.6	1.6
20	500	775	62	587	508	160		584.2	2	685.8	1.6
24	600	915	68.3	702	610	167		692.2	2	812.8	1.6

Class 400 Weld Neck Flange Dimensions as per ASME B16.5

Size in Inch	Size in mm	Outer Diameter	Flange Thickness	Hub OD	Weld Neck OD	Welding Neck Length	Bore	RF Diameter	RF Height	PCD	Weld Face
		A	B	C	D	E	F	G	H	I	J
1/2	15	95	14.3	38	21.3	52	According to Schedule	34.9	7	66.7	1.6
3/4	20	115	15.9	48	26.7	57		42.9	7	82.6	1.6
1	25	125	17.5	54	33.4	62		50.8	7	88.9	1.6
1 1/4	32	135	20.7	64	42.2	67		63.5	7	98.4	1.6
1 1/2	40	155	22.3	70	48.3	70		73	7	114.3	1.6
2	50	165	25.4	84	60.3	73		92.1	7	127	1.6
2 1/2	65	190	28.6	100	73	79		104.8	7	149.2	1.6
3	80	210	31.8	117	88.9	83		127	7	168.3	1.6
3 1/2	90	230	35	133	101.6	86		139.7	7	184.2	1.6
4	100	255	35	146	114.3	89		157.2	7	200	1.6
5	125	280	38.1	178	141.3	102		185.7	7	235	1.6
6	150	320	41.3	206	168.3	103		215.9	7	269.9	1.6
8	200	380	47.7	260	219.1	117		269.9	7	330	1.6
10	250	445	54	321	273	124		323.8	7	387.4	1.6
12	300	520	57.2	375	323.8	137		381	7	450.8	1.6
14	350	585	60.4	425	355.6	149		412.8	7	514.4	1.6
16	400	650	63.5	483	406.4	152		469.9	7	571.5	1.6
18	450	710	66.7	533	457	165		533.4	7	628.6	1.6
20	500	775	69.9	587	508	168		584.2	7	685.8	1.6
24	600	915	76.2	702	610	175		692.2	7	812.8	1.6

Class 600 Weld Neck Flange Dimensions as per ASME B16.5

Size in Inch	Size in mm	Outer Diameter	Flange Thickness	Hub OD	Weld Neck OD	Welding Neck Length	Bore	RF Diameter	RF Height	PCD	Weld Face
		A	B	C	D	E	F	G	H	I	J
1/2	15	95	14.3	38	21.3	52	According to Schedule	34.9	7	66.7	1.6
3/4	20	115	15.9	48	26.7	57		42.9	7	82.6	1.6
1	25	125	17.5	54	33.4	62		50.8	7	88.9	1.6
1 1/4	32	135	20.7	64	42.2	67		63.5	7	98.4	1.6
1 1/2	40	155	22.3	70	48.3	70		73	7	114.3	1.6
2	50	165	25.4	84	60.3	73		92.1	7	127	1.6
2 1/2	65	190	28.6	100	73	79		104.8	7	149.2	1.6
3	80	210	31.8	117	88.9	83		127	7	168.3	1.6
3 1/2	90	230	35	133	101.6	86		139.7	7	184.2	1.6
4	100	275	38.1	152	114.3	102		157.2	7	215.9	1.6
5	125	330	44.5	189	141.3	114		185.7	7	266.7	1.6
6	150	355	47.7	222	168.3	117		215.9	7	292.1	1.6
8	200	420	55.6	273	219.1	133		269.9	7	349.2	1.6
10	250	510	63.5	343	273	152		323.8	7	431.8	1.6
12	300	560	66.7	400	323.8	156		381	7	489	1.6
14	350	605	69.9	432	355.6	165		412.8	7	527	1.6
16	400	685	76.2	495	406.4	178		469.9	7	603.2	1.6
18	450	745	82.6	546	457	184		533.4	7	654	1.6
20	500	815	88.9	610	508	190		584.2	7	723.9	1.6
24	600	940	101.6	718	610	203		692.2	7	838.2	1.6

Class 900 Weld Neck Flange Dimensions as per ASME B16.5

Size in Inch	Size in mm	Outer Diameter	Flange Thickness	Hub OD	Weld Neck OD	Welding Neck Length	Bore	RF Diameter	RF Height	PCD	Weld Face
		A	B	C	D	E	F	G	H	I	J
1/2	15	120	22.3	38	21.3	60	According to Schedule	34.9	7	82.6	1.6
3/4	20	130	25.4	44	26.7	70		42.9	7	88.9	1.6
1	25	150	28.6	52	33.4	73		50.8	7	101.6	1.6
1 1/4	32	160	28.6	64	42.2	73		63.5	7	111.1	1.6
1 1/2	40	180	31.8	70	48.3	83		73	7	123.8	1.6
2	50	215	38.1	105	60.3	102		92.1	7	165.1	1.6
2 1/2	65	245	41.3	124	73	105		104.8	7	190.5	1.6
3	80	240	38.1	127	88.9	102		127	7	190.5	1.6
4	100	290	44.5	159	114.3	114		157.2	7	235	1.6
5	125	350	50.8	190	141.3	127		185.7	7	279.4	1.6
6	150	380	55.6	235	168.3	140		215.9	7	317.5	1.6
8	200	470	63.5	298	219.1	162		269.9	7	393.7	1.6
10	250	545	69.9	368	273	184		323.8	7	469.9	1.6
12	300	610	79.4	419	323.8	200		381	7	533.4	1.6
14	350	640	85.8	451	355.6	213		412.8	7	558.8	1.6
16	400	705	88.9	508	406.4	216		469.9	7	616	1.6
18	450	785	101.6	565	457	229		533.4	7	685.8	1.6
20	500	855	108	622	508	248		584.2	7	749.3	1.6
24	600	1040	139.7	749	610	292		692.2	7	901.7	1.6

Class 1500 Weld Neck Flange Dimensions as per ASME B16.5

Size in Inch	Size in mm	Outer Diameter	Flange Thickness	Hub OD	Weld Neck OD	Welding Neck Length	Bore	RF Diameter	RF Height	PCD	Weld Face
		A	B	C	D	E	F	G	H	I	J
1/2	15	120	22.3	38	21.3	60	According to Schedule	34.9	7	82.6	1.6
3/4	20	130	25.4	44	26.7	70		42.9	7	88.9	1.6
1	25	150	28.6	52	33.4	73		50.8	7	101.6	1.6
1 1/4	32	160	28.6	64	42.2	73		63.5	7	111.1	1.6
1 1/2	40	180	31.8	70	48.3	83		73	7	123.8	1.6
2	50	215	38.1	105	60.3	102		92.1	7	165.1	1.6
2 1/2	65	245	41.3	124	73	105		104.8	7	190.5	1.6
3	80	265	47.7	133	88.9	117		127	7	203.2	1.6
4	100	310	54	162	114.3	124		157.2	7	241.3	1.6
5	125	375	73.1	197	141.3	156		185.7	7	292.1	1.6
6	150	395	82.6	229	168.3	171		215.9	7	317.5	1.6
8	200	485	92.1	292	219.1	213		269.9	7	393.7	1.6
10	250	585	108	368	273	254		323.8	7	482.6	1.6
12	300	675	123.9	451	323.8	283		381	7	571.5	1.6
14	350	750	133.4	495	355.6	298		412.8	7	635	1.6
16	400	825	146.1	552	406.4	311		469.9	7	704.8	1.6
18	450	915	162	597	457	327		533.4	7	774.7	1.6
20	500	985	177.8	641	508	356		584.2	7	831.8	1.6
24	600	1170	203.2	762	610	406		692.2	7	990.6	1.6

Class 2500 Weld Neck Flange Dimensions as per ASME B16.5

Size in Inch	Size in mm	Outer Diameter	Flange Thickness	Hub OD	Weld Neck OD	Welding Neck Length	Bore	RF Diameter	RF Height	PCD	Weld Face
		A	B	C	D	E	F	G	H	I	J
1/2	15	135	30.2	43	21.3	73	According to Schedule	34.9	7	88.9	1.6
3/4	20	140	31.8	51	26.7	79		42.9	7	95.2	1.6
1	25	160	35	57	33.4	89		50.8	7	108	1.6
1 1/4	32	185	38.1	73	42.2	95		63.5	7	130.2	1.6
1 1/2	40	205	44.5	79	48.3	111		73	7	146	1.6
2	50	235	50.9	95	60.3	127		92.1	7	171.4	1.6
2 1/2	65	265	57.2	114	73	143		104.8	7	196.8	1.6
3	80	305	66.7	133	88.9	168		127	7	228.6	1.6
4	100	355	76.2	165	114.3	190		157.2	7	273	1.6
5	125	420	92.1	203	141.3	229		185.7	7	323.8	1.6
6	150	485	108	235	168.3	273		215.9	7	368.3	1.6
8	200	550	127	305	219.1	318		269.9	7	438.2	1.6
10	250	675	165.1	375	273	419		323.8	7	539.8	1.6
12	300	760	184.2	441	323.8	464		381	7	619.1	1.6

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