WN Flange Sizes & Weights (EN 1092)

Quick Reference

EN 1092-1 Type 11 weld neck flange dimensions (DN 15 to DN 3600) for PN 6, 10, 16, 25, and 40. All dimensions in millimeters.

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EN 1092-1 Weld Neck Flange Dimensions and Weights

What Is a “Type 11” EN 1092-1 Weld Neck Flange?

“Type 11” according to EN 1092-1 designates a weld neck flange, characterized by a long tapered hub that transitions smoothly from the flange to the pipe diameter. The flange is butt-welded to the pipe, creating a continuous, high-integrity connection. EN 1092-1 is a European standard specifying requirements for circular steel flanges ranging from PN 2.5 to PN 400 and sizes up to DN 4000.

Feature	Description
Design	Tapered hub reduces stress concentrations; bore matches pipe ID
Connection	Single butt weld to pipe
Face types	Raised Face (RF) for higher pressures; Flat Face (FF) for lower pressures
Materials	Carbon steel, alloy steel, stainless steel per EN 1092-1
Sizes	DN 15 to DN 3600
Pressure ratings	PN 6 to PN 400

Advantages

Advantage	Description
Durability	Strong connection that withstands significant stress and high impact
Leak prevention	Bore matching minimizes turbulence; high-integrity butt weld prevents leaks
Versatility	Suitable for various pressures, temperatures, and demanding applications

Applications

Weld neck flanges are common in oil and gas pipelines, petrochemical plants, power generation facilities, and processes involving high pressure and temperatures. The weld neck design is preferred for critical service conditions where connection integrity must be maintained.

Dimensions and Weights of EN 1092-1 WN Flanges

WN Flange PN 6

PN 6 weld neck flange dimensions (EN 1092-1 type 11) with stud metric bolts and nuts requirements (all sizes are in millimeters unless otherwise specified)

DN	d1	k	D	b	h1	d3	s	r	h2	d4	f	d2	Thread	Bolt Holes	Weight (KG)
15	21,3	55	80	12	30	30	2,00	4	6	40	2	11	M10	4	0,408
20	26,9	65	90	14	32	38	2,30	4	6	50	2	11	M10	4	0,621
25	33,7	75	100	14	35	42	2,60	4	6	60	2	11	M10	4	0,762
32	42,4	90	120	14	35	55	2,60	6	6	70	2	14	M12	4	1,110
40	48,3	100	130	14	38	62	2,60	6	7	80	3	14	M12	4	1,260
50	60,3	110	140	14	38	74	2,90	6	8	90	3	14	M12	4	1,430
65	76,1	130	160	14	38	88	2,90	6	9	110	3	14	M12	4	1,770
80	88,9	150	190	16	42	102	3,20	8	10	128	3	18	M16	4	2,880
100	114,3	170	210	16	45	130	3,60	8	10	148	3	18	M16	4	3,410
125	139,7	200	240	18	48	155	4,00	8	10	178	3	18	M16	8	4,650
150	168,3	225	265	18	48	184	4,50	10	12	202	3	18	M16	8	5,500
200	219,1	280	320	20	55	236	6,30	10	15	258	3	18	M16	8	8,600
250	273,0	335	375	22	60	290	6,30	12	15	312	3	18	M16	12	11,700
300	323,9	395	440	22	62	342	7,10	12	15	365	4	22	M20	12	15,300
350	355,6	445	490	22	62	385	7,10	12	15	415	4	22	M20	12	20,300
400	406,4	495	540	22	65	438	7,10	12	15	465	4	22	M20	16	23,100
450	457,0	550	595	22	65	492	7,10	12	15	520	4	22	M20	16	27,000
500	508,0	600	645	24	68	538	7,10	12	15	570	4	22	M20	20	30,800
600	610,0	705	755	30	70	640	7,10	12	16	670	5	26	M24	20	44,000
700	711,0	810	860	30	76	740	8,00	12	16	775	5	26	M24	24	53,700
800	813,0	920	975	30	76	842	8,00	12	16	880	5	30	M27	24	64,400
900	914,0	1020	1075	34	78	942	8,00	12	16	980	5	30	M27	24	79,200
1000	1016,0	1120	1175	38	82	1045	8,00	16	16	1080	5	30	M27	28	98,600
1200	1219,0	1340	1405	42	104	1248	8,80	16	20	1295	5	33	M30	32	152,000
1400	1422,0	1560	1630	56	114	1452	8,80	16	20	1510	5	36	M33	36	246,000
1600	1626,0	1760	1830	63	119	1655	10,00	16	20	1710	5	36	M33	40	309,000
1800	1829,0	1970	2045	69	133	1855	11,00	16	20	1920	5	39	M36	44	400,000
2000	2032,0	2180	2265	74	146	2058	12,50	16	25	2125	5	42	M39	48	516,000
2200	2235,0	2390	2475	81	154	2260	14,00	18	25	2335	5	42	M39	52	645,000
2400	2438,0	2600	2685	87	168	2462	15,00	18	25	2545	5	42	M39	56	786,000
2600	2620,0	2810	2905	91	175	2665	16,00	18	25	2750	5	48	M45	60	1.021,000
2800	2820,0	3020	3115	101	188	2865	17,00	18	30	2960	5	48	M45	64	1.256,000
3000	3020,0	3220	3315	102	192	3068	20,00	18	30	3160	5	48	M45	68	1.404,000
3200	3220,0	3430	3525	106	202	3272	20,00	20	30	3370	5	48	M45	72	1.617,000
3400	3420,0	3640	3735	110	214	3475	22,00	20	35	3580	5	48	M45	76	1.877,000
3600	3620,0	3860	3970	124	229	3678	22,00	20	35	3790	5	56	M52	80	2.366,000

WN Flange PN 10

PN 10 weld neck flange dimensions (EN 1092-1 type 11) with stud metric bolts and nuts requirements (all sizes are in millimeters unless otherwise specified)

DN	d1	k	D	b	h1	d3	s	r	h2	d4	f	d2	Thread	Bolt Holes	Weight (KG)
200	219,1	295	340	24	62	234	6,30	10	16	268	3	22	M20	8	11,600
250	273,0	350	395	26	68	292	6,30	12	16	320	3	22	M20	12	15,800
300	323,9	400	445	26	68	342	7,10	12	16	370	4	22	M20	12	18,300
350	355,6	460	505	26	68	385	7,10	12	16	430	4	22	M20	16	25,300
400	406,4	515	565	26	72	440	7,10	12	16	482	4	26	M24	16	30,600
450	457,0	565	615	28	72	488	7,10	12	16	532	4	26	M24	20	35,100
500	508,0	620	670	28	75	542	7,10	12	16	585	4	26	M24	20	40,500
600	610,0	725	780	30	82	642	8,00	12	18	685	5	30	M27	20	52,900
700	711,0	840	895	35	85	746	8,80	12	18	800	5	30	M27	24	75,800
800	813,0	950	1015	38	96	850	8,80	12	18	905	5	33	M30	24	102,000
900	914,0	1050	1115	38	99	950	12,50	12	20	1005	5	33	M30	28	121,000
1000	1016,0	1160	1230	44	105	1052	12,50	16	20	1110	5	36	M33	28	161,000
1200	1219,0	1380	1455	55	132	1256	12,50	16	25	1330	5	39	M36	32	258,000
1400	1422,0	1590	1675	65	143	1460	14,20	16	25	1535	5	42	M39	36	371,000
1600	1626,0	1820	1915	75	159	1666	16,00	16	25	1760	5	48	M45	40	547,000
1800	1829,0	2020	2115	85	175	1868	17,50	16	30	1960	5	48	M45	44	691,000
2000	2032,0	2230	2325	90	186	2072	17,50	16	30	2170	5	48	M45	48	830,000
2200	2235,0	2440	2550	100	202	2275	20,00	18	35	2370	5	56	M52	52	1.073,000
2400	2438,0	2650	2760	110	218	2478	22,20	18	35	2570	5	56	M52	56	1.329,000
2600	2620,0	2850	2960	110	224	2680	25,00	18	40	2780	5	56	M52	60	1.574,000
2800	2820,0	3070	3180	124	244	2882	25,00	18	40	3000	5	56	M52	64	1.987,000
3000	3020,0	3290	3405	132	257	3085	32,00	18	45	3210	5	62	M56	68	2.476,000

WN Flange PN 16

PN 16 weld neck flange dimensions (EN 1092-1 type 11) with stud metric bolts and nuts requirements (all sizes are in millimeters unless otherwise specified)

DN	d1	k	D	b	h1	d3	s	r	h2	d4	f	d2	Thread	Bolt Holes	Weight (KG)
15	21,3	65	95	16	38	32	2,00	4	6	45	2	14	M12	4	0,678
20	26,9	75	105	18	40	40	2,30	4	6	58	2	14	M12	4	0,768
25	33,7	85	115	18	40	46	2,60	4	6	68	2	14	M12	4	1,090
32	42,4	100	140	18	42	56	2,60	6	6	78	2	18	M16	4	1,300
40	48,3	110	150	18	45	64	2,60	6	7	88	3	18	M16	4	1,910
50	60,3	125	165	18	45	74	2,9	6	8	102	3	18	M16	4	2,530
65	76,1	145	185	18	45	92	2,9	6	10	122	3	18	M16	4	3,030
80	88,9	160	200	20	50	105	3,2	6	10	138	3	18	M16	8	3,920
100	114,3	180	220	20	52	131	3,6	8	12	158	3	18	M16	8	4,620
125	139,7	210	250	22	55	156	4,0	8	12	188	3	18	M16	8	6,300
150	168,3	240	285	22	55	184	4,5	10	12	212	3	22	M20	8	7,810
200	219,1	295	340	24	62	235	6,30	10	16	268	3	22	M20	12	11,500
250	273,0	355	405	26	70	292	6,30	12	16	320	3	26	M24	12	16,700
300	323,9	410	460	28	78	344	7,10	12	16	378	4	26	M24	12	22,100
350	355,6	470	520	30	82	390	8,00	12	16	438	4	26	M24	16	32,800
400	406,4	525	580	32	85	445	8,00	12	16	490	4	30	M27	16	41,100
450	457,0	585	640	34	83	490	8,00	12	16	550	4	30	M27	20	48,500
500	508	650	715,0	36	84	548	8,0	12	16	610	4	33	M30	20	63,400
600	610	770	840,0	40	88	670	10,0	12	18	725	5	36	M33	20	96,000
700	711	840	910,0	40	104	755	10,0	12	18	795	5	36	M33	24	96,500
800	813	950	1025,0	41	108	855	12,5	12	20	900	5	39	M36	24	122,000
900	914	1050	1125,0	48	118	955	12,5	12	20	1000	5	39	M36	28	155,000
1000	1016	1170	1255,0	59	137	1058	12,5	16	22	1115	5	42	M39	28	233,000
1200	1219	1390	1485,0	78	160	1262	14,2	16	30	1330	5	48	M45	32	390,000
1400	1422	1590	1685,0	84	177	1465	16,0	16	30	1530	5	48	M45	36	495,000
1600	1626	1820	1930,0	102	204	1668	17,5	16	35	1750	5	56	M52	40	760,000
1800	1829	2020	2130,0	110	218	1870	20,0	16	35	1950	5	56	M52	44	929,000
2000	2032	2230	2345,0	124	238	2072	22,0	16	40	2150	5	62	M56	48	1.185,000

WN Flange PN 25

PN 25 weld neck flange dimensions (EN 1092-1 type 11) with stud metric bolts and nuts requirements (all sizes are in millimeters unless otherwise specified)

DN	d1	k	D	b	h1	d3	s	r	h2	d4	f	d2	Thread	Bolt Holes	Weight (KG)
200	219,1	310	360	30	80	244	6,3	10	16	278	3	26	M24	12	17,100
250	273	370	425	32	88	298	7,1	12	18	335	3	30	M27	12	24,300
300	323,9	430	485	34	92	352	8,0	12	18	395	4	30	M27	16	31,800
350	355,6	490	555	38	100	398	8,0	12	20	450	4	33	M30	16	48,800
400	406,4	550	620	40	110	452	8,8	12	20	505	4	36	M33	16	63,300
450	457	600	670	46	110	500	8,8	12	20	550	4	36	M33	20	76,000
500	508	660	730	48	125	558	10,0	12	20	615	4	36	M33	20	97,000
600	610	770	845	48	125	660	11,0	12	20	720	5	39	M36	20	121,000
700	711	875	960	50	129	760	14,2	12	20	820	5	42	M39	24	155,000
800	813	990	1085	53	138	864	16,0	12	22	930	5	48	M45	24	205,000
900	914	1090	1185	57	148	968	17,5	12	24	1030	5	48	M45	28	249,000
1000	1016	1210	1320	63	160	1070	20,0	16	24	1140	5	56	M52	28	338,000

WN Flange PN 40

PN 40 weld neck flange dimensions (EN 1092-1 type 11) with stud metric bolts and nuts requirements (all sizes are in millimeters unless otherwise specified)

DN	d1	k	D	b	h1	d3	s	r	h2	d4	f	d2	Thread	Bolt Holes	Weight (KG)
15	21,3	65	95	16	38	32	2,00	4	6	45	2	14	M12	4	0,768
20	26,9	75	105	18	40	40	2,30	4	6	58	2	14	M12	4	1,090
25	33,7	85	115	18	40	46	2,60	4	6	68	2	14	M12	4	1,300
32	42,4	100	140	18	42	56	2,60	6	6	78	2	18	M16	4	1,910
40	48,3	110	150	18	45	64	2,60	6	7	88	3	18	M16	4	2,150
50	60,3	125	165	20	48	75	2,90	6	8	102	3	18	M16	4	2,850
65	76,1	145	185	22	52	90	2,90	6	10	122	3	18	M16	8	3,680
80	88,9	160	200	24	58	105	3,20	8	12	138	3	18	M16	8	4,780
100	114,3	190	235	24	65	134	3,60	8	12	162	3	22	M20	8	6,460
125	139,7	220	270	26	68	162	4,00	8	12	188	3	26	M24	8	8,860
150	168,3	250	300	28	75	192	4,50	10	12	218	3	26	M24	8	11,700
200	219,1	320	375	34	88	244	6,30	10	16	285	3	30	M27	12	21,000
250	273,0	385	450	38	105	306	7,10	12	18	345	3	33	M30	12	34,200
300	323,9	450	515	42	115	362	8,00	12	18	410	4	33	M30	16	47,600
350	355,6	510	580	46	125	408	8,80	12	20	465	4	36	M33	16	69,300
400	406,4	585	660	50	135	462	11,00	12	20	535	4	39	M36	16	98,000
450	457,0	610	685	57	135	500	12,50	12	20	560	4	39	M36	20	105,000
500	508,0	670	755	57	140	562	14,20	12	20	615	4	42	M39	20	130,000
600	610,0	795	890	72	150	666	16,00	12	20	735	5	48	M45	20	209,000

Tolerance EN1092-1 WN Flanges

EN 1092-1 specifies dimensional tolerances for circular steel flanges from DN 10 to DN 4000 and PN 2.5 to PN 400. Tolerance values vary by flange size (DN), pressure class (PN), and flange type. The full tolerance tables are published in the EN 1092-1 standard document.

Below are the main tolerance categories applicable to weld neck flanges (Type 11):

Diameter of Bolt Circle (P):

Tolerance values ensure that bolt holes align correctly with mating flanges for proper bolting without strain.

Diameter of Bolt Holes (D):

Bolt holes are slightly larger than the nominal bolt size to accommodate variations in bolt size and allow for easier assembly.

Flange Thickness (C):

Flange thickness tolerances account for manufacturing variations while maintaining the required pressure capacity.

Outside Diameter of Flange (D):

This tolerance ensures the flange fits within mating equipment or pipework, accounting for manufacturing variations.

Flange Hub Diameter at Base and Length (E and F):

These tolerances control the fit between flange and pipe. For weld neck flanges, a smooth hub-to-pipe transition is required to avoid turbulence and stress concentrations.

Bore Diameter (B):

The bore must match the pipe inside diameter to maintain a smooth flow path and proper alignment.

For specific tolerance values, refer to the tables and annexes of the EN 1092-1 standard. Values vary across sizes and pressure classes. The full standard document is available through national standards organizations (e.g., BSI, DIN, AFNOR).