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Long Weld Neck Flanges

Phone : +86 156 1591 7199

Email : sales01@sdzzsteel.com

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

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

Size in Inch	Size in mm	Outer Dia.	Flange Thick.	Hub OD	Weld Neck OD	RF Dia.	RF Height	PCD	Hub Length	No of Bolts	Bolt Size UNC	Machine Bolt Length	RF Stud Length	Hole Size	ISO Stud Size
		A	B	C	D	E	F	G	H
1/2	15	90	9.6	30	21.3	34.9	2	60.3	As Required	4	1/2	50	55	5/8	M14
3/4	20	100	11.2	38	26.7	42.9	2	69.9	As Required	4	1/2	50	65	5/8	M14
1	25	110	12.7	49	33.4	50.8	2	79.4	As Required	4	1/2	55	65	5/8	M14
1 1/4	32	115	14.3	59	42.2	63.5	2	88.9	As Required	4	1/2	55	70	5/8	M14
1 1/2	40	125	15.9	65	48.3	73	2	98.4	As Required	4	1/2	65	70	5/8	M14
2	50	150	17.5	78	60.3	92.1	2	120.7	As Required	4	5/8	70	85	3/4	M16
2 1/2	65	180	20.7	90	73	104.8	2	139.7	As Required	4	5/8	75	90	3/4	M16
3	80	190	22.3	108	88.9	127	2	152.4	As Required	4	5/8	75	90	3/4	M16
3 1/2	90	215	22.3	122	101.6	139.7	2	177.8	As Required	8	5/8	75	90	3/4	M16
4	100	230	22.3	135	114.3	157.2	2	190.5	As Required	8	5/8	75	90	3/4	M16
5	125	255	22.3	164	141.3	185.7	2	215.9	As Required	8	3/4	85	95	7/8	M20
6	150	280	23.9	192	168.3	215.9	2	241.3	As Required	8	3/4	85	100	7/8	M20
8	200	345	27	246	219.1	269.9	2	298.5	As Required	8	3/4	90	110	7/8	M20
10	250	405	28.6	305	273	323.8	2	362	As Required	12	7/8	100	115	1	M24
12	300	485	30.2	365	323.8	381	2	431.8	As Required	12	7/8	100	120	1	M24
14	350	535	33.4	400	355.6	412.8	2	476.3	As Required	12	1	115	135	1 1/8	M27
16	400	595	35	457	406.4	469.9	2	539.8	As Required	16	1	115	135	1 1/8	M27
18	450	635	38.1	505	457.2	533.4	2	577.9	As Required	16	1 1/8	125	145	1 1/4	M30
20	500	700	41.3	559	508	584.2	2	635	As Required	20	1 1/8	140	160	1 1/4	M30
24	600	815	46.1	663	610	692.2	2	749.3	As Required	20	1 1/4	150	170	1 3/8	M33

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

Size in Inch	Size in mm	Outer Dia.	Flange Thick.	Hub OD	Weld Neck OD	RF Dia.	RF Height	PCD	Hub Length	No of Bolts	Bolt Size UNC	Machine Bolt Length	RF Stud Length	Hole Size	ISO Stud Size
		A	B	C	D	E	F	G	H
1/2	15	95	12.7	38	21.3	34.9	2	66.7	As Required	4	1/2	55	65	5/8	M14
3/4	20	115	14.3	48	26.7	42.9	2	82.6	As Required	4	5/8	65	75	3/4	M16
1	25	125	15.9	54	33.4	50.8	2	88.9	As Required	4	5/8	65	75	3/4	M16
1 1/4	32	135	17.5	64	42.2	63.5	2	98.4	As Required	4	5/8	70	85	3/4	M16
1 1/2	40	155	19.1	70	48.3	73	2	114.3	As Required	4	3/4	75	90	7/8	M20
2	50	165	20.7	84	60.3	92.1	2	127	As Required	8	5/8	75	90	3/4	M16
2 1/2	65	190	23.9	100	73	104.8	2	149.2	As Required	8	3/4	85	100	7/8	M20
3	80	210	27	117	88.9	127	2	168.3	As Required	8	3/4	90	110	7/8	M20
3 1/2	90	230	28.6	133	101.6	139.7	2	184.2	As Required	8	3/4	95	110	7/8	M20
4	100	255	30.2	146	114.3	157.2	2	200	As Required	8	3/4	95	115	7/8	M20
5	125	280	33.4	178	141.3	185.7	2	235	As Required	8	3/4	110	120	7/8	M20
6	150	320	35	206	168.3	215.9	2	269.9	As Required	12	3/4	110	120	7/8	M20
8	200	380	39.7	260	219.1	269.9	2	330.2	As Required	12	7/8	120	140	1	M24
10	250	445	46.1	321	273	323.8	2	387.4	As Required	16	1	140	160	1 1/8	M27
12	300	520	49.3	375	323.8	381	2	450.8	As Required	16	1 1/8	145	170	1 1/4	M30
14	350	585	52.4	425	355.6	412.8	2	514.4	As Required	20	1 1/8	160	180	1 1/4	M30
16	400	650	55.6	483	406.4	469.9	2	571.5	As Required	20	1 1/4	165	190	1 3/8	M33
18	450	710	58.8	533	457	533.4	2	628.6	As Required	24	1 1/4	170	195	1 3/8	M33
20	500	775	62	587	508	584.2	2	685.8	As Required	24	1 1/4	185	205	1 3/8	M33
24	600	915	68.3	702	610	692.2	2	812.8	As Required	24	1 1/2	205	230	1 5/8	M39

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

Size in Inch	Size in mm	Outer Dia.	Flange Thick.	Hub OD	Weld Neck OD	RF Dia.	RF Height	PCD	Hub Length	No of Bolts	Bolt Size UNC	RF Stud Length	Hole Size	ISO Stud Size
		A	B	C	D	E	F	G	H
1/2	15	95	14.3	38	21.3	34.9	7	66.7	As Required	4	1/2	75	5/8	M14
3/4	20	115	15.9	48	26.7	42.9	7	82.6	As Required	4	5/8	90	3/4	M16
1	25	125	17.5	54	33.4	50.8	7	88.9	As Required	4	5/8	90	3/4	M16
1 1/4	32	135	20.7	64	42.2	63.5	7	98.4	As Required	4	5/8	95	3/4	M16
1 1/2	40	155	22.3	70	48.3	73	7	114.3	As Required	4	3/4	110	7/8	M20
2	50	165	25.4	84	60.3	92.1	7	127	As Required	8	5/8	110	3/4	M16
2 1/2	65	190	28.6	100	73	104.8	7	149.2	As Required	8	3/4	120	7/8	M20
3	80	210	31.8	117	88.9	127	7	168.3	As Required	8	3/4	125	7/8	M20
3 1/2	90	230	35	133	101.6	N/A	7	184.2	As Required	8	7/8	140	1	M24
4	100	255	35	146	114.3	157.2	7	200	As Required	8	7/8	140	1	M24
5	125	280	38.1	178	141.3	185.7	7	235	As Required	8	7/8	145	1	M24
6	150	320	41.3	206	168.3	215.9	7	269.9	As Required	12	7/8	150	1	M24
8	200	380	47.7	260	219.1	269.9	7	330	As Required	12	1	170	1 1/8	M27
10	250	445	54	321	273	323.8	7	387.4	As Required	16	1 1/8	190	1 1/4	M30
12	300	520	57.2	375	323.8	381	7	450.8	As Required	16	1 1/4	205	1 3/8	M33
14	350	585	60.4	425	355.6	412.8	7	514.4	As Required	20	1 1/4	210	1 3/8	M33
16	400	650	63.5	483	406.4	469.9	7	571.5	As Required	20	1 3/8	220	1 1/2	M36
18	450	710	66.7	533	457	533.4	7	628.6	As Required	24	1 3/8	230	1 1/2	M36
20	500	775	69.9	587	508	584.2	7	685.8	As Required	24	1 1/2	240	1 3/4	M39
24	600	915	76.2	702	610	692.2	7	812.8	As Required	24	1 3/4	265	1 7/8	M45

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

Size in Inch	Size in mm	Outer Dia.	Flange Thick.	Hub OD	Weld Neck OD	RF Dia.	RF Height	PCD	Hub Length	No of Bolts	Bolt Size UNC	RF Stud Length	Hole Size	ISO Stud Size
		A	B	C	D	E	F	G	H
1/2	15	95	14.3	38	21.3	34.9	7	66.7	As Required	4	1/2	75	5/8	M14
3/4	20	115	15.9	48	26.7	42.9	7	82.6	As Required	4	5/8	90	3/4	M16
1	25	125	17.5	54	33.4	50.8	7	88.9	As Required	4	5/8	90	3/4	M16
1 1/4	32	135	20.7	64	42.2	63.5	7	98.4	As Required	4	5/8	95	3/4	M16
1 1/2	40	155	22.3	70	48.3	73	7	114.3	As Required	4	3/4	110	7/8	M20
2	50	165	25.4	84	60.3	92.1	7	127	As Required	8	5/8	110	3/4	M16
2 1/2	65	190	28.6	100	73	104.8	7	149.2	As Required	8	3/4	120	7/8	M20
3	80	210	31.8	117	88.9	127	7	168.3	As Required	8	3/4	125	7/8	M20
3 1/2	90	230	35	133	101.6	N/A	7	184.2	As Required	8	7/8	140	1	M24
4	100	275	38.1	152	114.3	157.2	7	215.9	As Required	8	7/8	145	1	M24
5	125	330	44.5	189	141.3	185.7	7	266.7	As Required	8	1	165	1 1/8	M27
6	150	355	47.7	222	168.3	215.9	7	292.1	As Required	12	1	170	1 1/8	M27
8	200	420	55.6	273	219.1	269.9	7	349.2	As Required	12	1 1/8	190	1 1/4	M30
10	250	510	63.5	343	273	323.8	7	431.8	As Required	16	1 1/4	215	1 3/8	M33
12	300	560	66.7	400	323.8	381	7	489	As Required	20	1 1/4	220	1 3/8	M33
14	350	605	69.9	432	355.6	412.8	7	527	As Required	20	1 3/8	235	1 1/2	M36
16	400	685	76.2	495	406.4	469.9	7	603.2	As Required	20	1 1/2	255	1 5/8	M39
18	450	745	82.6	546	457	533.4	7	654	As Required	20	1 5/8	275	1 3/4	M42
20	500	815	88.9	610	508	584.2	7	723.9	As Required	24	1 5/8	285	1 3/4	M42

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

Size in Inch	Size in mm	Outer Dia.	Flange Thick.	Hub OD	Weld Neck OD	RF Dia.	RF Height	PCD	Hub Length	No of Bolts	Bolt Size UNC	RF Stud Length	Hole Size	ISO Stud Size
		A	B	C	D	E	F	G	H
1/2	15	120	22.3	38	21.3	34.9	7	82.6	As Required	4	3/4	110	7/8	M20
3/4	20	130	25.4	44	26.7	42.9	7	88.9	As Required	4	3/4	115	7/8	M20
1	25	150	28.6	52	33.4	50.8	7	101.6	As Required	4	7/8	125	1	M24
1 1/4	32	160	28.6	64	42.2	63.5	7	111.1	As Required	4	7/8	125	1	M24
1 1/2	40	180	31.8	70	48.3	73	7	123.8	As Required	4	1	140	1 1/8	M27
2	50	215	38.1	105	60.3	92.1	7	165.1	As Required	8	7/8	145	1	M24
2 1/2	65	245	41.3	124	73	104.8	7	190.5	As Required	8	1	160	1 1/8	M27
3	80	240	38.1	127	88.9	127	7	190.5	As Required	8	7/8	145	1	M24
4	100	290	44.5	159	114.3	157.2	7	235	As Required	8	1 1/8	170	1 1/4	M30
5	125	350	50.8	190	141.3	185.7	7	279.4	As Required	8	1 1/4	190	1 3/8	M33
6	150	380	55.6	235	168.3	215.9	7	317.5	As Required	12	1 1/8	190	1 1/4	M30
8	200	470	63.5	298	219.1	269.9	7	393.7	As Required	12	1 3/8	220	1 1/2	M36
10	250	545	69.9	368	273	323.8	7	469.9	As Required	16	1 3/8	235	1 1/2	M36
12	300	610	79.4	419	323.8	381	7	533.4	As Required	20	1 3/8	255	1 1/2	M36
14	350	640	85.8	451	355.6	412.8	7	558.8	As Required	20	1 1/2	275	1 5/8	M39
16	400	705	88.9	508	406.4	469.9	7	616	As Required	20	1 5/8	285	1 3/4	M42
18	450	785	101.6	565	457	533.4	7	685.8	As Required	20	1 7/8	325	2	M48
20	500	855	108	622	508	584.2	7	749.3	As Required	20	2	350	2 1/8	M52
24	600	1040	139.7	749	610	692.2	7	901.7	As Required	20	2 1/2	440	2 5/8	M64

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

Size in Inch	Size in mm	Outer Dia.	Flange Thick.	Hub OD	Weld Neck OD	RF Dia.	RF Height	PCD	Hub Length	No of Bolts	Bolt Size UNC	RF Stud Length	Hole Size	ISO Stud Size
		A	B	C	D	E	F	G	H
1/2	15	120	22.3	38	21.3	34.9	7	82.6	As Required	4	3/4	110	7/8	M20
3/4	20	130	25.4	44	26.7	42.9	7	88.9	As Required	4	3/4	115	7/8	M20
1	25	150	28.6	52	33.4	50.8	7	101.6	As Required	4	7/8	125	1	M24
1 1/4	32	160	28.6	64	42.2	63.5	7	111.1	As Required	4	7/8	125	1	M24
1 1/2	40	180	31.8	70	48.3	73	7	123.8	As Required	4	1	140	1 1/8	M27
2	50	215	38.1	105	60.3	92.1	7	165.1	As Required	8	7/8	145	1	M24
2 1/2	65	245	41.3	124	73	104.8	7	190.5	As Required	8	1	160	1 1/8	M27
3	80	265	47.7	133	88.9	127	7	203.2	As Required	8	1 1/8	180	1 1/4	M30
4	100	310	54	162	114.3	157.2	7	241.3	As Required	8	1 1/4	195	1 3/8	M33
5	125	375	73.1	197	141.3	185.7	7	292.1	As Required	8	1 1/2	250	1 5/8	M39
6	150	395	82.6	229	168.3	215.9	7	317.5	As Required	12	1 3/8	260	1 1/2	M36
8	200	485	92.1	292	219.1	269.9	7	393.7	As Required	12	1 5/8	290	1 3/4	M42
10	250	585	108	368	273	323.8	7	482.6	As Required	12	1 7/8	335	2	M48
12	300	675	123.9	451	323.8	381	7	571.5	As Required	16	2	375	2 1/8	M52
14	350	750	133.4	495	355.6	412.8	7	635	As Required	16	2 1/4	405	2 3/8	M56
16	400	825	146.1	552	406.4	469.9	7	704.8	As Required	16	2 1/2	445	2 5/8	M64
18	450	915	162	597	457	533.4	7	774.7	As Required	16	2 3/4	495	2 7/8	M72
20	500	985	177.8	641	508	584.2	7	831.8	As Required	16	3	540	3 1/8	M76
24	600	1170	203.2	762	610	692.2	7	990.6	As Required	16	3 1/2	615	3 5/8	M90

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

Size in Inch	Size in mm	Outer Dia.	Flange Thick.	Hub OD	Weld Neck OD	RF Dia.	RF Height	PCD	Hub Length	No of Bolts	Bolt Size UNC	RF Stud Length	Hole Size	ISO Stud Size
		A	B	C	D	E	F	G	H
1/2	15	135	30.2	43	21.3	34.9	7	88.9	As Required	4	3/4	120	7/8	M20
3/4	20	140	31.8	51	26.7	42.9	7	95.2	As Required	4	3/4	125	7/8	M20
1	25	160	35	57	33.4	50.8	7	108	As Required	4	7/8	140	1	M24
1 1/4	32	185	38.1	73	42.2	63.5	7	130.2	As Required	4	1	150	1 1/8	M27
1 1/2	40	205	44.5	79	48.3	73	7	146	As Required	4	1 1/8	170	1 1/4	M30
2	50	235	50.9	95	60.3	92.1	7	171.4	As Required	8	1	180	1 1/8	M27
2 1/2	65	265	57.2	114	73	104.8	7	196.8	As Required	8	1 1/8	195	1 1/4	M30
3	80	305	66.7	133	88.9	127	7	228.6	As Required	8	1 1/4	220	1 3/8	M33
4	100	355	76.2	165	114.3	157.2	7	273	As Required	8	1 1/2	255	1 5/8	M39
5	125	420	92.1	203	141.3	185.7	7	323.8	As Required	8	1 3/4	300	1 7/8	M45
6	150	485	108	235	168.3	215.9	7	368.3	As Required	8	2	345	2 1/8	M52
8	200	550	127	305	219.1	269.9	7	438.2	As Required	12	2	380	2 1/8	M52
10	250	675	165.1	375	273	323.8	7	539.8	As Required	12	2 1/2	490	2 5/8	M64
12	300	760	184.2	441	323.8	381	7	619.1	As Required	12	2 3/4	540	2 7/8	M72

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