Dimension table · Flanges

Flange dimensions PN 6 to PN 40 to EN 1092-1

Bolt circle K, outside diameter D, raised-face diameter d1, number and diameter of bolt holes n × L, plus pipe outside diameter and bolt size M – in separate tables for each pressure rating from PN 6 to PN 40, covering all nominal sizes from DN 10 to DN 800. All dimensions in millimetres, dimension letters to EN 1092-1.

Dimensioned drawing in front view and full section (dimension letters to EN 1092-1): D = outside diameter, K = bolt circle, n × Ø L = number × diameter of bolt holes, b = flange thickness, f = raised-face height, d₁ = raised-face diameter, A = welding end, s = wall thickness, B = bore. Accent colour on bolt circle K. Drawing not to scale.

Bolt-hole diameter L is not the bolt diameter: L is the hole in the flange – the matching bolt is always thinner (clearance for assembly and alignment). Example: 18 mm hole → M16 bolt. The bolt size follows from the standard, not from the hole dimension.

DN 10 – DN 800

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

PN 6 – connecting dimensions (DN 10–800)

The standard names dimensions. What is listed here is deliverable – from stock or procured; how quickly a size is available we clarify on request.

DN	Pipe OD (mm) ¹	n × ØL – bolt holes (mm)	M – bolts ²	Ød1 – raised face (mm)	ØK – bolt circle (mm)	ØD – outside (mm)
10	17.2	4 × 11	M10	35	50	75
15	21.3	4 × 11	M10	40	55	80
20	26.9	4 × 11	M10	50	65	90
25	33.7	4 × 11	M10	60	75	100

Show full table · more than 20 rows

Flange dimensions to EN 1092-1, PN 6 – all dimensions in mm – availability: from stock or procured
DN	Pipe OD (mm) ¹	n × ØL – bolt holes (mm)	M – bolts ²	Ød1 – raised face (mm)	ØK – bolt circle (mm)	ØD – outside (mm)
10	17.2	4 × 11	M10	35	50	75
15	21.3	4 × 11	M10	40	55	80
20	26.9	4 × 11	M10	50	65	90
25	33.7	4 × 11	M10	60	75	100
32	42.4	4 × 14	M12	70	90	120
40	48.3	4 × 14	M12	80	100	130
50	60.3	4 × 14	M12	90	110	140
65	76.1	4 × 14	M12	110	130	160
80	88.9	4 × 18	M16	128	150	190
100	114.3	4 × 18	M16	148	170	210
125	139.7	8 × 18	M16	178	200	240
150	168.3	8 × 18	M16	202	225	265
200	219.1	8 × 18	M16	258	280	320
250	273.0	12 × 18	M16	312	335	375
300	323.9	12 × 22	M20	365	395	440
350	355.6	12 × 22	M20	415	445	490
400	406.4	16 × 22	M20	465	495	540
450	457	16 × 22	M20	520	550	595
500	508	20 × 22	M20	570	600	645
600	610	20 × 26	M24	670	705	755
700	711	24 × 26	M24	775	810	860
800	813	24 × 30	M27	880	920	975

Kind of value: standard dimension to EN 1092-1 – number of bolt holes n, bolt hole diameter ØL, bolt M, raised face Ød1, bolt circle ØK, outside diameter ØD. Assignment – pipe outside diameter: it is taken from the pipe standard, not from EN 1092-1.

PN 10 – connecting dimensions (DN 10–800)

DN	Pipe OD (mm) ¹	n × ØL – bolt holes (mm)	M – bolts ²	Ød1 – raised face (mm)	ØK – bolt circle (mm)	ØD – outside (mm)
10	17.2	4 × 14	M12	40	60	90
15	21.3	4 × 14	M12	45	65	95
20	26.9	4 × 14	M12	58	75	105
25	33.7	4 × 14	M12	68	85	115

Show full table · more than 20 rows

Flange dimensions to EN 1092-1, PN 10 – all dimensions in mm – availability: from stock or procured
DN	Pipe OD (mm) ¹	n × ØL – bolt holes (mm)	M – bolts ²	Ød1 – raised face (mm)	ØK – bolt circle (mm)	ØD – outside (mm)
10	17.2	4 × 14	M12	40	60	90
15	21.3	4 × 14	M12	45	65	95
20	26.9	4 × 14	M12	58	75	105
25	33.7	4 × 14	M12	68	85	115
32	42.4	4 × 18	M16	78	100	140
40	48.3	4 × 18	M16	88	110	150
50	60.3	4 × 18	M16	102	125	165
65 ³	76.1	8 × 18	M16	122	145	185
80	88.9	8 × 18	M16	138	160	200
100	114.3	8 × 18	M16	158	180	220
125	139.7	8 × 18	M16	188	210	250
150	168.3	8 × 22	M20	212	240	285
200	219.1	8 × 22	M20	268	295	340
250	273.0	12 × 22	M20	320	350	395
300	323.9	12 × 22	M20	370	400	445
350	355.6	16 × 22	M20	430	460	505
400	406.4	16 × 26	M24	482	515	565
450	457	20 × 26	M24	532	565	615
500	508	20 × 26	M24	585	620	670
600	610	20 × 30	M27	685	725	780
700	711	24 × 30	M27	800	840	895
800	813	24 × 33	M30	905	950	1015

PN 16 – connecting dimensions (DN 10–800)

DN	Pipe OD (mm) ¹	n × ØL – bolt holes (mm)	M – bolts ²	Ød1 – raised face (mm)	ØK – bolt circle (mm)	ØD – outside (mm)
10	17.2	4 × 14	M12	40	60	90
15	21.3	4 × 14	M12	45	65	95
20	26.9	4 × 14	M12	58	75	105
25	33.7	4 × 14	M12	68	85	115

Show full table · more than 20 rows

Flange dimensions to EN 1092-1, PN 16 – all dimensions in mm – availability: from stock or procured
DN	Pipe OD (mm) ¹	n × ØL – bolt holes (mm)	M – bolts ²	Ød1 – raised face (mm)	ØK – bolt circle (mm)	ØD – outside (mm)
10	17.2	4 × 14	M12	40	60	90
15	21.3	4 × 14	M12	45	65	95
20	26.9	4 × 14	M12	58	75	105
25	33.7	4 × 14	M12	68	85	115
32	42.4	4 × 18	M16	78	100	140
40	48.3	4 × 18	M16	88	110	150
50	60.3	4 × 18	M16	102	125	165
65 ³	76.1	8 × 18	M16	122	145	185
80	88.9	8 × 18	M16	138	160	200
100	114.3	8 × 18	M16	158	180	220
125	139.7	8 × 18	M16	188	210	250
150	168.3	8 × 22	M20	212	240	285
200	219.1	12 × 22	M20	268	295	340
250	273.0	12 × 26	M24	320	355	405
300	323.9	12 × 26	M24	378	410	460
350	355.6	16 × 26	M24	438	470	520
400	406.4	16 × 30	M27	490	525	580
450	457	20 × 30	M27	550	585	640
500	508	20 × 33	M30	610	650	715
600	610	20 × 36	M33	725	770	840
700	711	24 × 36	M33	795	840	910
800	813	24 × 39	M36	900	950	1025

PN 25 – connecting dimensions (DN 200–800)

Flange dimensions to EN 1092-1, PN 25 – all dimensions in mm – availability: from stock or procured
DN	Pipe OD (mm) ¹	n × ØL – bolt holes (mm)	M – bolts ²	Ød1 – raised face (mm)	ØK – bolt circle (mm)	ØD – outside (mm)
200	219.1	12 × 26	M24	278	310	360
250	273.0	12 × 30	M27	335	370	425
300	323.9	16 × 30	M27	395	430	485
350	355.6	16 × 33	M30	450	490	555
400	406.4	16 × 36	M33	505	550	620
450	457	20 × 36	M33	555	600	670
500	508	20 × 36	M33	615	660	730
600	610	20 × 39	M36	720	770	845
700	711	24 × 42	M39	820	875	960
800	813	24 × 48	M45	930	990	1085

PN 40 – connecting dimensions (DN 10–600)

DN	Pipe OD (mm) ¹	n × ØL – bolt holes (mm)	M – bolts ²	Ød1 – raised face (mm)	ØK – bolt circle (mm)	ØD – outside (mm)
10	17.2	4 × 14	M12	40	60	90
15	21.3	4 × 14	M12	45	65	95
20	26.9	4 × 14	M12	58	75	105
25	33.7	4 × 14	M12	68	85	115

Show full table · more than 10 rows

Flange dimensions to EN 1092-1, PN 40 – all dimensions in mm – availability: from stock or procured
DN	Pipe OD (mm) ¹	n × ØL – bolt holes (mm)	M – bolts ²	Ød1 – raised face (mm)	ØK – bolt circle (mm)	ØD – outside (mm)
10	17.2	4 × 14	M12	40	60	90
15	21.3	4 × 14	M12	45	65	95
20	26.9	4 × 14	M12	58	75	105
25	33.7	4 × 14	M12	68	85	115
32	42.4	4 × 18	M16	78	100	140
40	48.3	4 × 18	M16	88	110	150
50	60.3	4 × 18	M16	102	125	165
65	76.1	8 × 18	M16	122	145	185
80	88.9	8 × 18	M16	138	160	200
100	114.3	8 × 22	M20	162	190	235
125	139.7	8 × 26	M24	188	220	270
150	168.3	8 × 26	M24	218	250	300
200	219.1	12 × 30	M27	285	320	375
250	273.0	12 × 33	M30	345	385	450
300	323.9	16 × 33	M30	410	450	515
350	355.6	16 × 36	M33	465	510	580
400	406.4	16 × 39	M36	535	585	660
450	457	20 × 39	M36	560	610	685
500	508	20 × 42	M39	615	670	755
600	610	20 × 48	M45	735	795	890

¹ Pipe OD = outside diameter of the matching pipe. Depending on the flange type, the flange bore is slightly larger (clearance) or, for welding neck flanges, follows the pipe inside diameter – see the note above.

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

³ For DN 65 at PN 10 and PN 16, EN 1092-1 specifies 8 bolt holes. Older flanges to the former DIN 2501 have 4 holes here and are still common in existing plants – check the bolt-hole pattern before ordering replacements or extensions.

PN 40 is not standardised for DN 700 and DN 800. For DN 10 to DN 40 the dimensions of PN 10, PN 16 and PN 25 are identical to PN 40; for DN 50 to DN 150 the same applies to PN 10 with PN 16 and to PN 25 with PN 40.

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How this data is compiled. This page does not reproduce a standard. It shows the dimensions you need for an enquiry, an order and installation – for sizes we supply, checked against documents from manufacturing works and suppliers and against our own range. Each value states what kind of value it is: specified by the standard, calculated by us or customary in the trade. The currently valid standard is binding. It is available from DIN Media or from your national standards body. How we select our sources and keep them up to date: About this knowledge.

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. These tables do not replace the standard – the current edition of the standard always governs.