Dimension table · Flanges · Type 11

Welding neck flange type 11: dimensions to EN 1092-1

Every dimension of the welding neck flange (type 11) in one table per pressure rating: the connection dimensions outside diameter D, bolt circle K, bolt holes n × L and raised face d₁, together with the type-specific dimensions plate thickness C₂, height H₂, hub diameter N₁ and wall thickness s, plus indicative weights – from PN 6 to PN 40, for all nominal sizes from DN 10 to DN 800. All dimensions in millimetres, dimension letters to EN 1092-1.

Dimensioned drawing of the welding neck flange type 11 in full section (dimension letters to EN 1092-1): C₂ = plate thickness, H₂ = height, N₁ = hub diameter, s = wall thickness at the weld end, H₃ = cylindrical hub end, R₁ = transition radius, f₁ = raised-face height, d₁ = raised-face diameter, A = outside diameter of the hub at the weld end (equals the pipe outside diameter), D = outside diameter. The bolt hole is shown in section; the number and diameter of bolt holes n × L are given in the tables. Accent colour on the pipe outside diameter A. Drawing not to scale.

Connection dimensions are the same across types: outside diameter D, bolt circle K, bolt holes n × L and raised face d₁ apply per DN and PN to all flange types to EN 1092-1 – they are included in the tables here. For the type-independent overview of all pressure ratings, see our flange dimensions PN 6 to PN 40; plate thickness, height and hub are type-specific.

The welding neck flange (type 11) is butt-welded to the pipe with its tapered hub. The continuous force flow from the plate through the hub into the pipe makes it the first choice for higher pressures and temperatures, cyclic loading and critical media – in plant engineering it is the most widely used flange type. For an overview of all styles and their ASME counterparts, see our page flange types international.

DN 10 – DN 800

The column headers use the dimension letters from the drawing above: A = pipe outside diameter, n × ØL = number × diameter of bolt holes, M = bolt size, d₁ = raised face, K = bolt circle, D = outside diameter, C₂ = plate thickness, H₂ = height, N₁ = hub diameter, s = wall thickness.

Jump to pressure rating: PN 6 PN 10 PN 16 PN 25 PN 40

PN 6 – dimension table (DN 10–800)

Welding neck flange type 11 to EN 1092-1, PN 6 – connection and type dimensions in mm, weights in kg – availability: available (from stock or on order)
DN	Pipe OD (mm) ¹	n × ØL (mm)	M ²	Ød₁ (mm)	ØK (mm)	ØD (mm)	C₂ (mm) ³	H₂ (mm)	N₁ (mm)	s (mm) ⁴	Weight (kg) ⁵
10	17.2	4 × 11	M10	35	50	75	12	28	26	1.8	0.353
15	21.3	4 × 11	M10	40	55	80	12	30	30	2.0	0.408
20	26.9	4 × 11	M10	50	65	90	14	32	38	2.3	0.621
25	33.7	4 × 11	M10	60	75	100	14	35	42	2.6	0.762
32	42.4	4 × 14	M12	70	90	120	14	35	55	2.6	1.11
40	48.3	4 × 14	M12	80	100	130	14	38	62	2.6	1.26
50	60.3	4 × 14	M12	90	110	140	14	38	74	2.9	1.43
65	76.1	4 × 14	M12	110	130	160	14	38	88	2.9	1.77
80	88.9	4 × 18	M16	128	150	190	16	42	102	3.2	2.88
100	114.3	4 × 18	M16	148	170	210	16	45	130	3.6	3.41
125	139.7	8 × 18	M16	178	200	240	18	48	155	4.0	4.65
150	168.3	8 × 18	M16	202	225	265	18	48	184	4.5	5.50
200	219.1	8 × 18	M16	258	280	320	20	55	236	6.3	8.60
250	273.0	12 × 18	M16	312	335	375	22	60	290	6.3	11.7
300	323.9	12 × 22	M20	365	395	440	22	62	342	7.1	15.3
350	355.6	12 × 22	M20	415	445	490	22	62	385	7.1	20.3
400	406.4	16 × 22	M20	465	495	540	22	65	438	7.1	23.1
500	508	20 × 22	M20	570	600	645	24	68	538	7.1	30.8
600	610	20 × 26	M24	670	705	755	30	70	640	7.1	44.0
700	711	24 × 26	M24	775	810	860	30	76	740	–	53.7
800	813	24 × 30	M27	880	920	975	30	76	842	–	64.4

PN 10 – dimension table (DN 10–800)

Welding neck flange type 11 to EN 1092-1, PN 10 – connection and type dimensions in mm, weights in kg – availability: available (from stock or on order)
DN	Pipe OD (mm) ¹	n × ØL (mm)	M ²	Ød₁ (mm)	ØK (mm)	ØD (mm)	C₂ (mm) ³	H₂ (mm)	N₁ (mm)	s (mm) ⁴	Weight (kg) ⁵
10	17.2	4 × 14	M12	40	60	90	16	35	28	1.8	0.678
15	21.3	4 × 14	M12	45	65	95	16	38	32	2.0	0.768
20	26.9	4 × 14	M12	58	75	105	18	40	40	2.3	1.09
25	33.7	4 × 14	M12	68	85	115	18	40	46	2.6	1.30
32	42.4	4 × 18	M16	78	100	140	18	42	56	2.6	1.91
40	48.3	4 × 18	M16	88	110	150	18	45	64	2.6	2.15
50	60.3	4 × 18	M16	102	125	165	18	45	74	2.9	2.53
65 ⁶	76.1	8 × 18	M16	122	145	185	18	45	92	2.9	3.03
80	88.9	8 × 18	M16	138	160	200	20	50	105	3.2	3.92
100	114.3	8 × 18	M16	158	180	220	20	52	131	3.6	4.62
125	139.7	8 × 18	M16	188	210	250	22	55	156	4.0	6.30
150	168.3	8 × 22	M20	212	240	285	22	55	184	4.5	7.81
200	219.1	8 × 22	M20	268	295	340	24	62	234	6.3	11.6
250	273.0	12 × 22	M20	320	350	395	26	68	292	6.3	15.8
300	323.9	12 × 22	M20	370	400	445	26	68	342	7.1	18.3
350	355.6	16 × 22	M20	430	460	505	26	68	385	7.1	25.3
400	406.4	16 × 26	M24	482	515	565	26	72	440	7.1	30.6
500	508	20 × 26	M24	585	620	670	28	75	542	7.1	40.5
600	610	20 × 30	M27	685	725	780	30	82	642	7.1	52.9
700	711	24 × 30	M27	800	840	895	35	85	746	–	75.8
800	813	24 × 33	M30	905	950	1015	38	96	850	–	102

PN 16 – dimension table (DN 10–800)

Welding neck flange type 11 to EN 1092-1, PN 16 – connection and type dimensions in mm, weights in kg – availability: available (from stock or on order)
DN	Pipe OD (mm) ¹	n × ØL (mm)	M ²	Ød₁ (mm)	ØK (mm)	ØD (mm)	C₂ (mm) ³	H₂ (mm)	N₁ (mm)	s (mm) ⁴	Weight (kg) ⁵
10	17.2	4 × 14	M12	40	60	90	16	35	28	1.8	0.678
15	21.3	4 × 14	M12	45	65	95	16	38	32	2.0	0.768
20	26.9	4 × 14	M12	58	75	105	18	40	40	2.3	1.09
25	33.7	4 × 14	M12	68	85	115	18	40	46	2.6	1.30
32	42.4	4 × 18	M16	78	100	140	18	42	56	2.6	1.91
40	48.3	4 × 18	M16	88	110	150	18	45	64	2.6	2.15
50	60.3	4 × 18	M16	102	125	165	18	45	74	2.9	2.53
65 ⁶	76.1	8 × 18	M16	122	145	185	18	45	92	2.9	3.03
80	88.9	8 × 18	M16	138	160	200	20	50	105	3.2	3.92
100	114.3	8 × 18	M16	158	180	220	20	52	131	3.6	4.62
125	139.7	8 × 18	M16	188	210	250	22	55	156	4.0	6.30
150	168.3	8 × 22	M20	212	240	285	22	55	184	4.5	7.81
200	219.1	12 × 22	M20	268	295	340	24	62	235	6.3	11.5
250	273.0	12 × 26	M24	320	355	405	26	70	292	6.3	16.7
300	323.9	12 × 26	M24	378	410	460	28	78	344	7.1	22.1
350	355.6	16 × 26	M24	438	470	520	30	82	390	8.0	32.8
400	406.4	16 × 30	M27	490	525	580	32	85	445	8.0	41.1
500	508	20 × 33	M30	610	650	715	36	84	548	8.0	66.2
600	610	20 × 36	M33	725	770	840	40	88	670	8.8	104
700	711	24 × 36	M33	795	840	910	40	104	755	–	96.5
800	813	24 × 39	M36	900	950	1025	41	108	855	–	122

PN 25 – dimension table (DN 10–800)

Welding neck flange type 11 to EN 1092-1, PN 25 – connection and type dimensions in mm, weights in kg – availability: available (from stock or on order)
DN	Pipe OD (mm) ¹	n × ØL (mm)	M ²	Ød₁ (mm)	ØK (mm)	ØD (mm)	C₂ (mm) ³	H₂ (mm)	N₁ (mm)	s (mm) ⁴	Weight (kg) ⁵
10	17.2	4 × 14	M12	40	60	90	16	35	28	1.8	0.678
15	21.3	4 × 14	M12	45	65	95	16	38	32	2.0	0.768
20	26.9	4 × 14	M12	58	75	105	18	40	40	2.3	1.09
25	33.7	4 × 14	M12	68	85	115	18	40	46	2.6	1.30
32	42.4	4 × 18	M16	78	100	140	18	42	56	2.6	1.91
40	48.3	4 × 18	M16	88	110	150	18	45	64	2.6	2.15
50	60.3	4 × 18	M16	102	125	165	20	48	75	2.9	2.85
65	76.1	8 × 18	M16	122	145	185	22	52	90	2.9	3.68
80	88.9	8 × 18	M16	138	160	200	24	58	105	3.2	4.78
100	114.3	8 × 22	M20	162	190	235	24	65	134	3.6	6.46
125	139.7	8 × 26	M24	188	220	270	26	68	162	4.0	8.86
150	168.3	8 × 26	M24	218	250	300	28	75	192	4.5	11.7
200	219.1	12 × 26	M24	278	310	360	30	80	244	6.3	17.1
250	273.0	12 × 30	M27	335	370	425	32	88	298	7.1	24.3
300	323.9	16 × 30	M27	395	430	485	34	92	352	8.0	31.8
350	355.6	16 × 33	M30	450	490	555	38	100	398	8.0	48.8
400	406.4	16 × 36	M33	505	550	620	40	110	452	8.8	63.3
500	508	20 × 36	M33	615	660	730	48	125	558	10.0	97.0
600	610	20 × 39	M36	720	770	845	48	125	660	11.0	121
700	711	24 × 42	M39	820	875	960	50	129	760	–	155
800	813	24 × 48	M45	930	990	1085	53	138	864	–	205

PN 40 – dimension table (DN 10–600)

Welding neck flange type 11 to EN 1092-1, PN 40 – connection and type dimensions in mm, weights in kg – availability: available (from stock or on order)
DN	Pipe OD (mm) ¹	n × ØL (mm)	M ²	Ød₁ (mm)	ØK (mm)	ØD (mm)	C₂ (mm) ³	H₂ (mm)	N₁ (mm)	s (mm) ⁴	Weight (kg) ⁵
10	17.2	4 × 14	M12	40	60	90	16	35	28	1.8	0.678
15	21.3	4 × 14	M12	45	65	95	16	38	32	2.0	0.768
20	26.9	4 × 14	M12	58	75	105	18	40	40	2.3	1.09
25	33.7	4 × 14	M12	68	85	115	18	40	46	2.6	1.30
32	42.4	4 × 18	M16	78	100	140	18	42	56	2.6	1.91
40	48.3	4 × 18	M16	88	110	150	18	45	64	2.6	2.15
50	60.3	4 × 18	M16	102	125	165	20	48	75	2.9	2.85
65	76.1	8 × 18	M16	122	145	185	22	52	90	2.9	3.68
80	88.9	8 × 18	M16	138	160	200	24	58	105	3.2	4.78
100	114.3	8 × 22	M20	162	190	235	24	65	134	3.6	6.46
125	139.7	8 × 26	M24	188	220	270	26	68	162	4.0	8.86
150	168.3	8 × 26	M24	218	250	300	28	75	192	4.5	11.7
200	219.1	12 × 30	M27	285	320	375	34	88	244	6.3	21.0
250	273.0	12 × 33	M30	345	385	450	38	105	306	7.1	34.2
300	323.9	16 × 33	M30	410	450	515	42	115	362	8.0	47.6
350	355.6	16 × 36	M33	465	510	580	46	125	408	8.8	69.3
400	406.4	16 × 39	M36	535	585	660	50	135	462	11.0	98.0
500	508	20 × 42	M39	615	670	755	57	140	562	14.2	130
600	610	20 × 48	M45	735	795	890	72	150	666	16.0	209

How to order unambiguously: the designation to EN 1092-1

The standard specifies a consistent designation system: Flange EN 1092-1, then type and sealing face form, nominal size, pressure rating and material. A welding neck flange type 11 with sealing face form B1, DN 200, PN 40 in P250GH is therefore designated:

Flange EN 1092-1/11 B1/DN 200/PN 40/P250GH

If the hub is to have a wall thickness that deviates from the standard value – for example to match a thick-walled pipe – the required wall thickness s in millimetres is added before the material, for example Flange EN 1092-1/11 B1/DN 200/PN 40/10/P250GH for s = 10 mm. Anyone who supplies both figures receives the matching flange without a query – the bore of the welding neck flange is matched to the pipe inside diameter.

¹ Pipe OD = outside diameter of the matching pipe (in the standard: “outside diameter of the hub” A). The bore of the welding neck flange follows the pipe inside diameter and therefore depends on the pipe wall thickness – state this when ordering.

² M = metric bolt size to EN 1092-1; the bolt-hole diameter ØL is always larger than the bolt thread.

³ Plate thickness C₂ including raised-face height f₁ (sealing face form B1).

⁴ s = wall thickness at the weld end (standard value). Deviating hub wall thicknesses are permitted under EN 1092-1 and are stated in the designation – see the ordering example. From DN 700 the standard does not specify a wall thickness (“–”) – execution by agreement, usually matched to the pipe wall thickness.

⁵ Weights are indicative values for steel flanges; minor deviations are possible depending on manufacturer and design.

⁶ DN 65 has 8 bolt holes at PN 10 and PN 16 to EN 1092-1. Older flanges to DIN 2501 have 4 holes here and are still common in existing plant – check the bolt-hole pattern for replacement and extension orders.

For DN 10 to DN 40 the type 11 dimensions of pressure ratings PN 10, PN 16 and PN 25 are identical to PN 40; for DN 50 to DN 150 this applies to PN 10 with PN 16 and to PN 25 with PN 40 respectively. For DN 700 and DN 800, pressure rating PN 40 is not standardised.

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Technical basis: EN 1092-1. All information without guarantee – the current standard texts and the manufacturers’ technical data sheets always prevail. Values selected according to our delivery and stock programme; compiled from our own ERP data and long-standing trading practice, cross-checked against publicly available manufacturer information and reference tables. These tables do not replace the standard text – the current edition of the standard always governs. Editorially reviewed: August 2026. Standards and manufacturer status considered: August 2026.