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Weld Neck Flange

Application Scenarios:
● Long-distance oil & gas transmission pipelines, wellhead supporting equipment, core process pipelines of refineries;
● High-temperature and high-pressure steam pipelines for power stations, main delivery pipelines of boilers;
● Coal chemical industry, hydrogenation units, high-pressure reaction pipelines for large-scale chemical plants;
● Offshore oil and gas platforms, LNG cryogenic transmission pipelines, connecting nozzles of high-pressure pressure vessels.

Category:

Flanges

Email:

lipeng@dongjunpipe.com

WhatsApp:

8613121803826

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Product Model

Class 150

Class 900

Description

产品描述

Product Overview

Full pressure rating coverage: American standard Class150~2500, Chinese national standard PN16~PN160. WN flanges are standard fittings for high-pressure wellhead equipment complying with API6A specification.

The flange is integrally formed with a tapered long neck. The pipe and flange neck are joined by full penetration groove butt welding, and welds are eligible for non-destructive testing via RT and UT.

Core Technical Parameter Table

Parameter Item	Parameter Value
Abbreviation	WN
Full Product Name	Welding Neck Flange
GB Standard Materials	Carbon Steel:20# Alloy Steel:16Mn、20MnMo、15CrMo、12Cr1MoV、14Cr1Mo、12Cr2Mo1、12Cr2Mo1V、12Cr5Mo、10Cr9Mo1VNbN、30CrMo、35CrMo Low Temperature Steel:16MnD、20MnMoD、09MnNiD Austenitic Stainless Steel:S30408 (304)、S30403 (304L)、S30409 (304H)、S32168 (321)、S32169 (321H) 、S34778 (347)、S34779 (347H) 、S31608 (316) 、S31603 (316L) 、S31609 (316H) Duplex Stainless Steel:S22053 (2205)
ASTM & ASME Materials	Carbon Steel:A105 Low Temperature Carbon Steel (A350):LF2、LF3、LF6 Line Pipe Steel (A694):F52、F60、F65、 F70 Low Alloy Steel (A182):F5、F5a、F9、F91、F92、F11 (Cl.1/2/3)、F22 (Cl.1/3) Austenitic Stainless Steel (A182):F304、F304L、F304H、F316、F316L、F316H、F321、F321H、F347、F347H Duplex Stainless Steel (A182):F51 (2205)、F60 (S32205)
Sealing Face Type	RF、FF、MFM、TG、RTJ
PN Pressure Rating (GB Standard)	PN2.5 PN06、PN10、PN16、PN25、PN40、PN63、PN100、PN160 PN250 PN320 PN400
Class Pressure Rating (ASME Standard)	Class 150、300、600、900、1500、2500
Certifications	API/ISO/CE
Payment Terms	L/C, D/P, T/T
Delivery Lead Time	10-30 day
Production Capacity	5000TONS/MONTH
Applicable Standard	The company manufactures flange products complying with international and domestic standards including ANSI B16.5, ASME B16.47/16.48, DIN EN 1092-1/2, JIS B2220, GOST 12821-80, GB/T 9124.1, SH/T 3406, SH/T 3426, SH/T 3425, HG/T 20615 and HG/T 20592.

Product Parameters

● HG/T20617-2009(WN)

Class150(PN20)

（mm）

Nominal Dimension		Outside Diameter A	Flange Outside Diameter D		Connection Dimension				Flange Thickness C	Hub Large End Diameter N		Flange Bore B		Flange Height H	Theoretical Weight Kg
DN	NPS	Outside Diameter A	Flange Outside Diameter D		Bolt Circle Diameter K	Bolt Hole Diameter L		Number of Bolt Holes n(pcs )	Flange Thickness C	Hub Large End Diameter N		Flange Bore B		Flange Height H	Theoretical Weight Kg
15	1/2	21.3	90	88.9	60.3	16	15.7	4	9.6	30	30.2	15.5	15.7	46	0.48
20	3/4	26.9	100	98.6	69.9	16	15.7	4	11.2	38	38.1	21	20.8	51	0.71
25	1	33.7	110	108	79.4	16	15.7	4	12.7	49	49.3	27	26.7	54	1.01
32	1 1/4	42.4	115	117.3	88.9	16	15.7	4	14.3	59	58.7	35	35.1	56	1.33
40	1 1/2	48.3	125	127	98.4	16	15.7	4	15.9	65	65	41	40.9	60	1.72
50	2	60.3	150	152.4	120.7	18	19.1	4	17.5	78	77.7	52	52.6	62	2.58
65	2 1/2	76.1	180	177.8	139.7	18	19.1	4	20.7	90	90.4	66	62.7	68	4.11
80	3	88.9	190	190.5	152.4	18	19.1	4	22.3	108	108	77.5	78	68	4.92
100	4	114.3	230	228.6	190.5	18	19.1	8	22.3	135	134.9	101.5	102.4	75	6.84
125	5	139.7	255	254	215.9	22	22.4	8	22.3	164	163.6	127	128.33	87	8.56
150	6	168.3	280	279.4	241.3	22	22.4	8	23.9	192	192	154	154.2	87	10.6
200	8	219.1	345	342.9	298.5	22	22.4	8	27.0	246	246.1	203	202.7	100	17.6
250	10	273	405	406.4	362.0	26	25.4	12	28.6	305	304.8	255	254.5	100	24
300	12	323.9	485	482.6	431.8	26	25.4	12	30.2	365	365.3	303.5	304.8	113	36.5
350	14	355.6	535	533.4	476.3	30	28.4	12	33.4	400	400.1	-	-	125	48.4
400	16	406.4	595	596.9	539.8	30	28.4	16	35.0	475	475.2	-	-	125	60.6
450	18	457	635	635	577.9	33	31.75	16	38.1	505	505	-	-	138	68.3
500	20	508	700	698.5	635.0	33	31.75	20	41.3	559	558.6	-	-	143	84.5
600	24	610	815	812.8	749.3	36	35.1	20	46.1	663	663.4	-	-	151	115

Class300(PN50)

（mm）

Nominal Dimension		Outside Diameter A	Flange Outside Diameter D		Connection Dimension				Flange Thickness C	Hub Large End Diameter N		Flange Bore B		Flange Height H	Theoretical Weight Kg
DN	NPS	Outside Diameter A	Flange Outside Diameter D		Bolt Circle Diameter K	Bolt Hole Diameter L		Number of Bolt Holes n(pcs )	Flange Thickness C	Hub Large End Diameter N		Flange Bore B		Flange Height H	Theoretical Weight Kg
15	½	21.3	95	88.9	66.7	16	15.7	4	12.7	38	38.1	15.5	15.7	51	0.75
20	¾	26.9	115	98.6	82.6	18	15.7	4	14.3	48	47.7	21	20.8	56	1.26
25	1	33.7	125	108	88.9	18	15.7	4	15.9	54	53.8	27	26.7	60	1.52
32	1¼	42.4	135	117.3	98.4	18	15.7	4	17.5	64	63.5	35	35.1	64	2.03
40	1½	48.3	155	127	114.3	22	15.7	4	19.1	70	69.85	41	40.9	67	2.89
50	2	60.3	165	152.4	127.0	18	19.1	8	20.7	84	84	52	52.6	68	3.4
65	2½	76.1	190	177.8	149.2	22	19.1	8	23.9	100	100	66	62.7	75	5.17
80	3	88.9	210	190.5	168.3	22	19.1	8	27.0	117	117.3	77.5	78	78	6.93
100	4	114.3	255	228.6	200.0	22	19.1	8	30.2	146	146	101.5	102.4	84	11.2
125	5	139.7	280	254	235.0	22	22.4	8	33.4	178	177.8	127	128.3	97	15.1
150	6	168.3	320	279.4	269.9	22	22.4	12	35.0	206	206.2	154	154.2	97	19.1
200	8	219.1	380	342.9	330.2	26	22.4	12	39.7	260	260.3	203	202.7	110	29.9
250	10	273	445	406.4	387.4	30	25.4	16	46.1	321	320.5	255	254.5	116	42.7
300	12	323.9	520	482.6	450.8	33	25.4	16	49.3	375	374.6	303.5	304.8	129	61.8
350	14	355.6	585	533.4	514.4	33	28.4	20	52.4	425	425.4	-	-	141	85.8
400	16	406.4	650	596.9	571.5	36	28.4	20	55.6	483	482.6	-	-	144	106
450	18	457	710	635	628.6	36	31.75	24	58.8	533	533.4	-	-	157	131
500	20	508	775	698.5	685.8	36	31.75	24	62.0	587	587.2	-	-	160	158
600	24	610	915	812.8	812.8	42	35.1	24	68.3	702	701.5	-	-	167	230

Class600(PN110)

（mm）

Nominal Dimension		Outside Diameter A	Flange Outside Diameter D		Connection Dimension				Flange Thickness C	Hub Large End Diameter N		Flange Bore B		Flange Height H	Theoretical Weight Kg
DN	NPS	Outside Diameter A	Flange Outside Diameter D		Bolt Circle Diameter K	Bolt Hole Diameter L		Number of Bolt Holes n(pcs )	Flange Thickness C	Hub Large End Diameter N		Flange Bore B		Flange Height H	Theoretical Weight Kg
20	3/4	26.9	115	98.6	82.6	18	15.7	4	15.9	48	47.8	-	-	57	1.76
25	1	33.7	125	108	88.9	18	15.7	4	17.5	54	53.8	-	-	62	2.49
32	1¼	42.4	135	117.3	98.4	18	15.7	4	20.7	64	63.5	-	-	67	3.49
40	1½	48.3	155	127	114.3	22	15.7	4	22.3	70	69.85	-	-	70	4.36
50	2	60.3	165	152.4	127.0	18	19.1	8	25.4	84	84.1	-	-	73	6.43
65	2½	76.1	190	177.8	149.2	22	19.1	8	28.6	100	100.1	-	-	79	8.53
80	3	88.9	210	190.5	168.3	22	19.1	8	31.8	117	117.3	-	-	83	10.7
100	4	114.3	275	228.6	215.9	26	19.1	8	38.1	152	152.4	-	-	102	17.4

Class600(PN110)

（mm）

Nominal Dimension		Outside Diameter A	Flange Outside Diameter D		Connection Dimension				Flange Thickness C	Hub Large End Diameter N		Flange Bore B		Flange Height H
DN	NPS	Outside Diameter A	Flange Outside Diameter D		Bolt Circle Diameter K	Bolt Hole Diameter L		Number of Bolt Holes n(pcs )	Flange Thickness C	Hub Large End Diameter N		Flange Bore B		Flange Height H
125	5	139.7	330	254	266.7	30	22.4	8	44.5	189	189	-	114	29.2
150	6	168.3	355	279.4	292.1	30	22.4	12	47.7	222	222.3	-	117	34.9
200	8	219.1	420	342.9	349.2	33	22.4	12	55.6	273	273.1	-	133	53.9
250	10	273	510	406.4	431.8	36	25.4	16	63.5	343	342.9	-	152	86.5
300	12	323.9	560	482.6	489.0	36	25.4	20	66.7	409	400.1	-	156	103
350	14	355.6	605	533.4	527.0	39	28.4	20	69.9	432	431.8	-	165	122
400	16	406.4	685	596.9	603.2	42	28.4	20	76.2	495	495.3	-	178	170
450	18	457	745	635	654.0	45	31.75	20	82.6	546	546.1	-	184	204
500	20	508	815	698.5	723.9	45	31.75	24	88.9	610	609.6	-	190	254
600	24	610	940	812.8	838.2	51	35.1	24	101.6	718	717.6	-	203	358

Class900(PN150)

（mm）

Nominal Dimension		Outside Diameter A	Flange Outside Diameter D		Connection Dimension				Hub Large End Diameter N		Flange Bore B		Flange Height H	Theoretical Weight Kg
DN	NPS	Outside Diameter A	Flange Outside Diameter D		Bolt Circle Diameter K	Bolt Hole Diameter L		Number of Bolt Holes n(pcs )	Hub Large End Diameter N		Flange Bore B		Flange Height H	Theoretical Weight Kg
15	1/2	21.3	120	88.9	82.6	22	15.7	4	22.3	38	-	-	60	1.87
20	3/4	26.9	130	98.6	88.9	22	15.7	4	25.4	44	-	-	70	2.56
25	1	33.7	150	108	101.6	26	15.7	4	28.6	52	-	-	73	3.74
32	1 1/4	42.4	160	117.3	111.1	26	15.7	4	28.6	64	-	-	73	4.33
40	1 1/2	48.3	180	127	123.8	30	15.7	4	31.8	70	-	-	83	5.94
50	2	60.3	215	152.4	165.1	26	19.1	8	38.1	105	-	-	102	10.8
65	2 1/2	76.1	245	177.8	190.5	30	19.1	8	41.3	124	-	-	105	15
80	3	88.9	240	190.5	190.5	23	19.1	8	38.1	127	-	-	102	13.7
100	4	114.3	290	228.6	235.0	33	19.1	8	44.5	159	-	-	114	22.5
125	5	139.7	350	254	279.4	36	22.4	8	50.8	190	-	-	127	37.4
150	6	168.3	380	279.4	317.5	33	22.4	12	55.6	235	-	-	140	47.7
200	8	219.1	470	342.9	393.7	39	22.4	12	63.5	298	-	-	162	81.3
250	10	273	545	406.4	469.9	39	25.4	16	69.9	368	-	-	184	119
300	12	323.9	610	482.6	533.4	39	25.4	20	79.4	419	-	-	200	157
350	14	355.6	640	533.4	558.8	42	28.4	20	85.8	451	-	-	213	180
400	16	406.4	705	596.9	616.0	45	28.4	20	88.9	508	-	-	216	217
450	18	457	785	635	685.8	51	31.75	20	101.6	565	-	-	229	292
500	20	508	855	698.5	749.3	55	31.75	20	108.0	622	-	-	248	362
600	24	610	1040	812.8	901.7	68	35.1	20	139.7	749	-	-	292	665

Class1500(PN260)

（mm）

Nominal Dimension		Outside Diameter A	Flange Outside Diameter D		Connection Dimension				Flange Thickness C	Hub Large End Diameter N	Flange Bore B	Flange Height H	Theoretical Weight Kg
DN	NPS	Outside Diameter A	Flange Outside Diameter D		Bolt Circle Diameter K	Bolt Hole Diameter L		Number of Bolt Holes n(pcs )	Flange Thickness C	Hub Large End Diameter N	Flange Bore B	Flange Height H	Theoretical Weight Kg
15	½	21.3	120	120.6	82.6	22	22.3	4	22.3	38	-	60	1.87
20	¾	26.9	130	130	88.9	22	22.3	4	25.4	44	-	70	2.56
25	1	33.7	150	149.3	101.6	26	25.4	4	28.6	52	-	73	3.74
32	1¼	42.4	160	158.7	111.1	26	25.4	4	28.6	64	-	73	4.33
40	1½	48.3	180	177.8	123.8	30	28.4	4	31.8	70	-	83	5.94
50	2	60.3	215	215.9	165.1	26	25.4	8	38.1	105	-	102	10.8
65	2½	76.1	245	244.3	190.5	30	28.4	8	41.3	124	-	105	15
80	3	88.9	265	266.7	203.2	33	31.7	8	47.7	133	-	117	19.9
100	4	114.3	310	311.1	241.3	36	35	8	54.0	162	-	124	29.9
125	5	139.7	375	374.6	292.1	42	41.1	8	73.1	197	-	156	55.4
150	6	168.3	395	393.7	317.5	39	38.1	12	82.6	229	-	171	68.4
200	8	219.1	485	482.6	393.7	45	44.4	12	92.1	292	-	213	117
250	10	273	585	584.2	482.6	51	50.8	12	108.0	368	-	254	194
300	12	323.9	675	673.1	571.5	55	53.8	16	123.9	451	-	283	288
350	14	355.6	750	749.3	635.0	60	60.45	16	133.4	495	-	298	380
400	16	406.4	825	825.5	704.8	68	66.55	16	146.1	552	-	311	485
450	18	457	915	914.4	774.7	74	73.15	16	162.0	597	-	327	644
500	20	508	985	984.2	831.8	80	79.25	16	177.8	641	-	356	775
600	24	610	1170	1168.4	990.6	94	91.9	16	203.2	762	-	406	1232

Class2500(PN420)

（mm）

Nominal Dimension		Outside Diameter A	Flange Outside Diameter D		Connection Dimension				Hub Large End Diameter N		Flange Bore B	Flange Height H	Theoretical Weight Kg
DN	NPS	Outside Diameter A	Flange Outside Diameter D		Bolt Circle Diameter K	Bolt Hole Diameter L		Number of Bolt Holes n(pcs )	Hub Large End Diameter N		Flange Bore B	Flange Height H	Theoretical Weight Kg
15	½	21.3	135	133.4	88.9	22	22.3	4	30.2	43	-	73	3.12
20	¾	26.9	140	139.7	95.2	22	22.3	4	31.8	51	-	79	3.7
25	1	33.7	160	158.8	108.0	26	25.4	4	35.0	57	-	89	5.24
32	1¼	42.4	185	184.2	130.2	30	28.4	4	38.1	73	-	95	7.74
40	1½	48.3	205	203.2	146.0	33	31.7	4	44.5	79	-	111	10.9
50	2	60.3	235	235	171.4	30	28.4	8	50.9	95	-	127	16.2
65	2½	76.1	265	266.7	196.8	33	31.7	8	57.2	114	-	143	23.7
80	3	88.9	305	304.8	228.6	36	35	8	66.7	133	-	168	36.2
100	4	114.3	355	355.6	273.0	42	41.1	8	76.2	165	-	190	55.3
125	5	139.7	420	419.1	323.8	48	47.8	8	92.1	203	-	229	92.6
150	6	168.3	485	482.6	368.3	55	53.8	8	108.0	235	-	273	143
200	8	219.1	550	552.5	438.2	55	53.8	12	127.0	305	-	318	215
250	10	273	675	673.1	539.8	68	66.55	12	165.1	375	-	419	406
300	12	323.9	760	762	619.1	74	73.15	12	184.2	441	-	464	572

● HG/T20595-2009(WN)

PN10

（mm）

Nominal Size	Outside Diameter A₁		Connection Dimensions					Flange Thickness		Flange Neck				Flange Height
DN	A	B	Flange Outside Diameter D	Bolt Circle Diameter K	Bolt Hole Diameter L	Number of Bolt Holes n	Bolt Th	C	A	B	S ≥	H₁ ≈	R	H
10	17.2	14	90	60	14	4	M12	16	28	28	1.8	6	4	35
15	21.3	18	95	65	14	4	M12	16	32	32	2.0	6	4	38
20	26.9	25	105	75	14	4	M12	18	40	40	2.3	6	4	40
25	33.7	32	115	85	14	4	M12	18	46	46	2.6	6	4	40
32	42.4	38	140	100	18	4	M16	18	56	56	2.6	6	6	42
40	48.3	45	150	110	18	4	M16	18	64	64	2.6	7	6	45
50	60.3	57	165	125	18	4	M16	18	74	74	2.9	8	5	45
65	76.1	65	185	145	18	8	M16	18	92	92	2.9	10	6	45
80	88.9	89	200	160	18	8	M16	20	105	105	3.2	10	6	50
100	114.3	108	220	180	18	8	M16	20	131	131	3.6	12	8	52
125	139.7	133	250	210	18	8	M16	22	156	156	4	12	8	55
150	168.3	159	285	240	22	8	M20	22	184	184	4.5	12	10	55
200	219.1	219	340	295	22	8	M20	24	234	234	6.3	16	10	62
250	273	273	395	350	22	12	M20	26	292	292	6.3	16	12	68
300	323.9	325	445	400	22	12	M20	26	342	342	7.1	16	12	68
350	355.6	377	505	460	22	16	M20	26	385	402	7.1	16	12	68
400	406.4	426	565	515	26	16	M24	26	440	458	7.1	16	12	72
450	457	480	615	565	26	20	M24	28	488	510	7.1	16	12	72
500	508	530	670	620	26	20	M24	28	542	562	7.1	16	12	75
600	610	630	780	725	30	20	M27	28	642	660	7.1	18	12	80
700	711	720	895	840	30	24	M27	30	746	755	8	18	12	80
800	813	820	1015	950	33	24	M30	32	850	855	8	18	12	90
900	914	920	1115	1050	33	28	M30	34	950	954	10	20	12	95
1000	1016	1020	1230	1160	36	28	M33	34	1052	1054	10	20	16	95
1200	1219	1220	1455	1380	39	32	M36×3	38	1256	1256	11	25	16	115
1400	1422	1420	1675	1590	42	36	M39×3	42	1460	1460	12	25	16	120
1600	1626	1620	1915	1820	48	40	M45×3	46	1666	1666	14	25	16	130
1800	1829	1820	2115	2020	48	44	M45×3	50	1868	1866	15	30	16	140
2000	2032	2020	2325	2230	48	48	M45×3	54	2072	2070	16	30	16	150

PN16

（mm）

Nominal Size	Outside Diameter A₁		Connection Dimensions					Flange Thickness		Flange Neck				Flange Height
DN	A	B	Flange Outside Diameter D	Bolt Circle Diameter K	Bolt Hole Diameter L	Number of Bolt Holes n	Bolt Th	C	A	B	S ≥	H₁ ≈	R	H
10	17.2	14	90	60	14	4	M12	16	28	28	1.8	6	4	35
15	21.3	18	95	65	14	4	M12	16	32	32	2.0	6	4	38
20	26.9	25	105	75	14	4	M12	18	40	40	2.3	6	4	40
25	33.7	32	115	85	14	4	M12	18	46	46	2.6	6	4	40
32	42.4	38	140	100	18	4	M16	18	56	56	2.6	6	6	42
40	48.3	45	150	110	18	4	M16	18	64	64	2.6	7	6	45
50	60.3	57	165	125	18	4	M16	18	74	74	2.9	8	5	45
65	76.1	65	185	145	18	8	M16	18	92	92	2.9	10	6	45
80	88.9	89	200	160	18	8	M16	20	105	105	3.2	10	6	50
100	114.3	108	220	180	18	8	M16	20	131	131	3.6	12	8	52
125	139.7	133	250	210	18	8	M16	22	156	156	4.0	12	8	55
150	168.3	159	285	240	22	8	M20	22	184	184	4.5	12	10	55
200	219.1	219	340	295	22	12	M20	24	235	235	6.3	16	10	62
250	273	273	405	355	26	12	M24	26	292	292	6.3	16	12	70
300	323.9	325	460	410	26	12	M24	28	344	344	7.1	16	12	78
350	355.6	377	520	470	26	16	M24	30	390	410	8.0	16	12	82
400	406.4	426	580	525	30	16	M27	32	445	464	8.0	16	12	85
450	457	480	640	585	30	20	M27	40	490	512	8.0	16	12	87
500	508	530	715	650	33	20	M30	44	548	578	8.0	16	12	90
600	610	630	840	770	36	20	M33	54	652	670	8.8	18	12	95
700	711	720	910	840	36	24	M33	36	755	759	8.8	18	12	100
800	813	820	1025	950	39	24	M36×3	38	855	855	10.0	20	12	105
900	914	920	1125	1050	39	28	M36×3	40	955	954	10.0	20	12	110
1000	1016	1020	1255	1170	42	28	M39×3	42	1058	1060	10.0	22	16	120
1200	1219	1220	1485	1390	48	32	M45×3	48	1262	1260	12.5	30	16	130
1400	1422	1420	1685	1590	48	36	M45×3	52	1465	1465	14.2	30	16	145
1600	1626	1620	1930	1820	56	40	M52×4	58	1668	1668	16	35	16	160
1800	1829	1820	2130	2020	56	44	M52×4	62	1870	1870	17.5	35	16	170
2000	2032	2020	2345	2230	62	48	M56×4	66	2072	2072	20	40	16	180

PN25

（mm）

Nominal Size	Outside Diameter A₁		Connection Dimensions					Flange Thickness		Flange Neck				Flange Height
DN	A	B	Flange Outside Diameter D	Bolt Circle Diameter K	Bolt Hole Diameter L	Number of Bolt Holes n	Bolt Th	C	A	B	S ≥	H₁ ≈	R	H
10	17.2	14	90	60	14	4	M12	16	28	28	1.8	6	4	35
15	21.3	18	95	65	14	4	M12	16	32	32	2.0	6	4	38
20	26.9	25	105	75	14	4	M12	18	40	40	2.3	6	4	40
25	33.7	32	115	85	14	4	M12	18	46	46	2.6	6	4	40
32	42.4	38	140	100	18	4	M16	18	56	56	2.6	6	6	42
40	48.3	45	150	110	18	4	M16	18	64	64	2.6	7	6	45
50	60.3	57	165	125	18	4	M16	20	75	75	2.9	8	6	48
65	76.1	76	185	145	18	8	M16	22	90	90	2.9	10	6	52
80	88.9	89	200	160	18	8	M16	24	105	105	3.2	12	8	58
100	114.3	108	235	190	22	8	M20	24	134	134	3.6	12	8	65
125	139.7	133	270	220	26	8	M24	26	162	162	4.0	12	8	68
150	168.3	159	300	250	26	8	M24	28	192	190	4.5	12	10	75
200	219.1	219	360	310	26	12	M24	30	244	244	6.3	16	10	80
250	273	273	425	370	30	12	M27	32	298	298	7.1	18	12	88
300	323.9	325	485	430	30	16	M27	34	352	352	8.0	18	12	92
350	355.6	377	555	490	33	16	M30	38	398	420	8.0	20	12	100
400	406.4	426	620	550	36	16	M33	40	452	472	8.8	20	12	110
450	457	480	670	600	36	20	M33	46	500	522	8.8	20	12	110
500	508	530	730	660	36	20	M33	48	558	580	10	20	12	125
600	610	630	845	770	39	20	M36×3	58	660	680	11	20	12	125

PN40

（mm）

Nominal Size	Outside Diameter A₁		Connection Dimensions					Flange Thickness		Flange Neck			Flange Height
DN	A	B	Flange Outside Diameter D	Bolt Circle Diameter K	Bolt Hole Diameter L	Number of Bolt Holes n	Bolt Th	C	A	B	S ≥	H₁≈	R
10	17.2	14	90	60	14	4	M12	16	28	28	1.8	6	4
15	21.3	18	95	65	14	4	M12	16	32	32	2.0	6	4
20	26.9	25	105	75	14	4	M12	18	40	40	2.3	6	4
25	33.7	32	115	85	14	4	M12	18	46	46	2.6	6	4
32	42.4	38	140	100	18	4	M16	18	56	56	2.6	6	6
40	48.3	45	150	110	18	4	M16	18	64	64	2.6	7	6
50	60.3	57	165	125	18	4	M16	20	75	75	2.9	8	6
65	76.1	76	185	145	18	8	M16	22	90	90	2.9	10	6
80	88.9	89	200	160	18	8	M16	24	105	105	3.2	12	8
100	114.3	108	235	190	22	8	M20	24	134	134	3.6	12	8
125	139.7	133	270	220	26	8	M24	26	162	162	4.0	12	8
150	168.3	159	300	250	26	8	M24	28	192	192	4.5	12	10
200	219.1	219	375	320	30	12	M27	34	244	244	6.3	16	10
250	273	273	450	385	33	12	M30	38	306	306	7.1	18	12
300	323.9	325	515	450	33	16	M30	42	362	362	8.0	18	12
350	355.6	377	580	510	36	16	M33	46	408	430	8.8	20	12
400	406.4	426	660	585	39	16	M36×3	50	462	482	11.0	20	12
450	457	480	685	610	39	20	M36×3	57	500	522	12.5	20	12
500	508	530	755	670	42	20	M39×3	57	562	584	14.2	20	12
600	610	630	890	795	48	20	M45×3	72	666	686	16.0	20	12

PN63

（mm）

Nominal Size	Outside Diameter A₁		Connection Dimensions					Flange Thickness		Flange Neck				Flange Height
DN	A	B	Flange Outside Diameter D	Bolt Circle Diameter K	Bolt Hole Diameter L	Number of Bolt Holes n	Bolt Th	C	A	B	S ≥	H₁ ≈	R	H
10	17.2	14	100	70	14	4	M12	20	32	32	1.8	6	4	45
15	21.3	18	105	75	14	4	M12	20	34	34	2.0	6	4	45
20	26.9	25	130	90	18	4	M16	22	42	42	2.6	8	4	48
25	33.7	32	140	100	18	4	M16	24	52	52	2.6	8	4	58
32	42.4	38	155	110	22	4	M20	24	62	62	2.9	8	6	60
40	48.3	45	170	125	22	4	M20	26	70	70	2.9	10	6	62
50	60.3	57	180	135	22	4	M20	26	82	82	2.9	10	6	62
65	76.1	76	205	160	22	8	M20	26	98	98	3.2	12	6	68
80	88.9	89	215	170	22	8	M20	28	112	112	3.6	12	8	72
100	114.3	108	250	200	26	8	M24	30	138	138	4.0	12	8	78
125	139.7	133	295	240	30	8	M27	34	168	168	4.5	12	8	88
150	168.3	159	345	280	33	8	M30	36	202	202	5.6	12	10	95
200	219.1	219	415	345	36	12	M33	42	256	256	7.1	16	10	110
250	273	273	470	400	36	12	M33	46	316	316	8.8	18	12	125
300	323.9	325	530	460	36	16	M33	52	372	372	11.0	18	12	140
350	355.6	377	600	525	39	16	M36×3	56	420	442	12.5	20	12	150
400	406.4	426	670	585	42	16	M39×3	60	475	495	14.2	20	12	160

PN100

（mm）

Nominal Size	Outside Diameter A₁		Connection Dimensions					Flange Thickness		Flange Neck				Flange Height
DN	A	B	Flange Outside Diameter D	Bolt Circle Diameter K	Bolt Hole Diameter L	Number of Bolt Holes n	Bolt Th	C	A	B	S ≥	H₁ ≈	R	H
10	17.2	14	100	70	14	4	M12	20	32	32	1.8	6	4	45
15	21.3	18	105	75	14	4	M12	20	34	34	2.0	6	4	45
20	26.9	25	130	90	18	4	M16	22	42	42	2.6	8	4	48
25	33.7	32	140	100	18	4	M16	24	52	52	2.6	8	4	58
32	42.4	38	155	110	22	4	M20	24	62	62	2.9	8	6	60
40	48.3	45	170	125	22	4	M20	26	70	70	2.9	10	6	62
50	60.3	57	195	145	26	4	M24	28	90	90	3.2	10	6	68
65	76.1	76	220	170	26	8	M24	30	108	108	3.6	12	6	76
80	88.9	89	230	180	26	8	M24	32	120	120	4.0	12	8	78
100	114.3	108	265	210	30	8	M27	36	150	150	5.0	12	8	90
125	139.7	133	315	250	33	8	M30	40	180	180	6.3	12	8	105
150	168.3	159	355	290	33	12	M30	44	210	210	7.1	12	10	115
200	219.1	219	430	360	36	12	M33	52	278	278	10.0	16	10	130
250	273	273	505	430	39	12	M36×3	60	340	340	12.5	18	12	157
300	323.9	325	585	500	42	16	M39×3	68	400	400	14.2	18	12	170
350	355.6	377	655	560	48	16	M45×3	74	460	482	16.0	20	12	189

PN160

（mm）

Nominal Size	Outside Diameter A₁		Connection Dimensions					Flange Thickness		Flange Neck				Flange Height
DN	A	B	Flange Outside Diameter D	Bolt Circle Diameter K	Bolt Hole Diameter L	Number of Bolt Holes n	Bolt Th	C	A	B	S ≥	H₁ ≈	R	H
10	17.2	14	100	70	14	4	M12	20	32	32	2.0	6	4	45
15	21.3	18	105	75	14	4	M12	20	34	34	2.0	6	4	45
20	26.9	25	130	90	18	4	M16	24	42	42	2.9	6	4	52
25	33.7	32	140	100	18	4	M16	24	52	52	2.9	8	4	58
32	42.4	38	155	110	22	4	M20	28	60	60	3.6	8	5	60
40	48.3	45	170	125	22	4	M20	28	70	70	3.6	10	6	64
50	60.3	57	195	145	26	4	M24	30	90	90	4	10	6	75
65	76.1	76	220	170	26	8	M24	34	108	108	5	12	6	82
80	88.9	89	230	180	26	8	M24	36	120	120	6.3	12	8	86
100	114.3	108	265	210	30	8	M27	40	150	150	8	12	8	100
125	139.7	133	315	250	33	8	M30	44	180	180	10	14	8	115
150	168.3	159	355	290	33	12	M30	50	210	210	12.5	14	10	128
200	219.1	219	430	360	36	12	M33	60	278	278	16	16	10	140
250	273	273	515	430	42	12	M39X3	68	340	340	20	18	12	155
300	323.9	325	585	500	42	16	M39X3	78	400	400	22.2	18	12	175

Production Process

FAQs

Basic info about your pipe fitting factory, establishment year and location?

Cangzhou Dongjun Pipe was founded in 2000, located in Buzhai Industrial Zone, Mengcun — China’s well-known capital of elbows and pipe fittings. We enjoy convenient transport near Huanghua Port, Beijing and Tianjin. Our annual production capacity reaches 20,000 tons, with 230 employees including 45 professional technical engineers. Factory visits are welcome.

What main pipe fitting products can you provide?

We manufacture high, medium and low pressure steel pipeline components. Main products include flanges, elbows, tees, reducers, socket weld inserts, nozzles and pipe supports. We have more than 1000 specifications covering mainstream pipeline accessories to realize one-stop procurement.

What metal materials are available for your pipe fittings?

We supply carbon steel, alloy steel, stainless steel, duplex steel and nickel-based alloy to fit different temperature, pressure and corrosion environments. If you need special custom metal materials for special working conditions, our technical team can also meet your requirements.

Which international standards do your products comply with?

Our products support GB, ASME, DIN and JIS standards. Every batch of goods can be matched with EN10204:2004 official test reports, which are widely recognized by engineering supervisors in global projects.

How do you control product quality before delivery?

We own over 200 sets of professional production and testing equipment, including full NDT devices, spectrometers and mechanical testing machines. Raw material inspection, semi-finished product testing and finished product full inspection will be completed strictly before shipment to avoid defective goods.

What certifications does your factory hold for project bidding?

We have ISO9001/14001/45001 system certificates, API Spec Q1 10th Edition certificate and China Special Equipment Manufacturing License for pressure pipeline components. All valid certificates can be provided for your tender review at any time.

Qualification

Weld Neck Flange

Email:

lipeng@dongjunpipe.com

WhatsApp:

8613121803826

OUR SERVICE

We offers a wealth of product support resources, including a range of technical and downloadable product manuals to product certifications.

Our Service Product Catalog

COMPANY STRENGTHS

Experience

26 years of professional pipe fittings production and customization experience, with 45 senior technical engineers to support project development.

OEM/ODM

Full support OEM & ODM customization. We produce carbon/alloy/stainless steel fittings with 1000+ specs complying with GB, ASME, DIN, JIS standards.

Reliable Quality

Strict raw material selection & full-process inspection. Our lab equips complete devices for chemical analysis, mechanical test and NDT.

Certification

Possess full authoritative qualifications: ISO triple system, API Spec Q1, national pressure pipeline manufacturing license, EN10204 test certificates available.

Export

Located in Mengcun pipe fittings hub adjacent to Huanghua Port. Products cover all China provinces and export to Southeast Asia, Middle East, South America and more.

Advanced Equipment & Tech

200+ sets of advanced forging, CNC machining and full inspection equipment, annual output reaches 20,000 tons of high-pressure pipe fittings.