Din Norm Flange Dimensions Table

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DIN Norm Flange Dimensions Table (PN 6 – PN 150)

Read this DIN Norm flange dimensions table before ordering: a valve only bolts onto the line if its flange matches the counter-flange already fitted, and the bolt circle and hole count differ between pressure ratings at the same nominal size.

Connection dimensions of DIN Norm flanges from PN 6 to PN 150 for nominal sizes DN 10 to DN 250. Use them to check that a valve flange matches the counter-flange on the line before ordering.All dimensions in millimetres. ØD flange outside diameter · ØF raised face diameter · f raised face height · b flange thickness · Øk bolt circle diameter · Øl bolt hole diameter · n number of bolts.

DN	PN 6							PN 10							PN 16							PN 25
DN	ØD	ØF	f	b	Øk	Øl	n	ØD	ØF	f	b	Øk	Øl	n	ØD	ØF	f	b	Øk	Øl	n	ØD	ØF	f	b	Øk	Øl	n
10	75	35	2	12	50	11	4	90	40	2	14	60	14	4	90	40	2	14	60	14	4	90	40	2	14	60	14	4
15	80	40	2	12	55	11	4	95	45	2	14	65	14	4	95	45	2	14	65	14	4	95	45	2	16	65	14	4
20	90	50	2	14	65	11	4	105	58	2	16	75	14	4	105	58	2	16	75	14	4	105	58	2	16	75	14	4
25	100	60	2	14	75	11	4	115	68	2	16	85	14	4	115	68	2	16	85	14	4	115	68	2	18	85	14	4
32	120	70	2	14	90	14	4	140	78	2	16	100	18	4	140	78	2	16	100	18	4	140	78	2	18	100	18	4
40	130	80	3	14	100	14	4	150	88	3	16	110	18	4	150	88	3	16	110	18	4	150	88	3	18	110	18	4
50	140	90	3	14	110	14	4	165	102	3	18	125	18	4	165	102	3	18	125	18	4	165	102	3	20	125	18	4
65	160	110	3	14	130	14	4	185	122	3	18	145	18	4	185	122	3	18	145	18	4	185	122	3	22	145	18	8
80	190	128	3	16	150	18	4	200	138	3	20	160	18	8	200	138	3	20	160	18	8	200	138	3	24	160	18	8
100	210	148	3	16	170	18	4	220	158	3	20	180	18	8	220	158	3	20	180	18	8	235	162	3	24	190	22	8
125	240	178	3	18	200	18	8	250	188	3	22	210	18	8	250	188	3	22	210	18	8	270	188	3	26	220	26	8
150	265	202	3	18	225	18	8	285	212	3	22	240	22	8	285	212	3	22	240	22	8	300	218	3	28	250	26	8
200	320	258	3	20	280	18	8	340	268	3	24	295	22	8	340	268	3	24	295	22	12	360	278	3	30	310	26	12
250	375	312	3	22	335	18	12	395	320	3	26	350	22	12	405	320	3	26	355	26	12	425	335	3	32	370	30	12

DN	PN 40							PN 64							PN 100							PN 150
DN	ØD	ØF	f	b	Øk	Øl	n	ØD	ØF	f	b	Øk	Øl	n	ØD	ØF	f	b	Øk	Øl	n	ØD	ØF	f	b	Øk	Øl	n
10	90	40	2	16	60	14	4	100	40	2	20	70	14	4	100	40	2	20	70	14	4	100	40	2	20	70	14	4
15	95	45	2	16	65	14	4	105	45	2	20	75	14	4	105	45	2	20	75	14	4	105	45	2	20	75	14	4
20	105	58	2	16	75	14	4	130	58	2	24	90	18	4	130	58	2	24	90	18	4	130	58	2	24	90	18	4
25	115	68	2	18	85	14	4	140	65	2	24	100	18	4	140	65	2	24	100	18	4	140	65	2	24	100	18	4
32	140	78	2	18	100	18	4	155	75	2	24	110	23	4	155	75	2	24	110	23	4	155	75	2	24	110	23	4
40	150	88	3	18	110	18	4	170	85	3	26	125	23	4	170	85	3	26	125	23	4	170	85	3	28	125	23	4
50	165	102	3	20	125	18	4	180	95	3	26	135	23	4	195	95	3	28	145	27	4	195	95	3	30	145	27	4
65	185	122	3	22	145	18	8	205	120	3	26	160	23	8	220	120	3	30	170	27	8	220	105	3	34	170	27	8
80	200	138	3	24	160	18	8	215	130	3	28	170	23	8	230	130	3	32	180	27	8	230	125	3	36	180	27	8
100	235	162	3	24	190	22	8	250	160	3	30	200	27	8	265	160	3	36	210	30	8	265	145	3	40	210	30	8
125	270	188	3	26	220	26	8	295	185	3	34	240	30	8	315	185	3	40	250	33	8	315	185	3	44	250	33	8
150	300	218	3	28	250	26	8	345	215	3	36	280	33	8	355	215	3	44	290	33	12	355	215	3	50	290	33	12
200	375	285	3	34	320	30	12	415	270	3	42	345	36	12	430	270	3	52	360	36	12	430	260	3	60	360	36	12
250	450	345	3	38	385	33	12	470	325	3	46	400	36	12	505	325	3	60	430	39	12	515	325	3	68	430	42	12

What the Columns Mean

Five figures decide whether two flanges can be bolted together, and the DIN Norm flange dimensions table gives all of them: the outside diameter of the flange, its thickness, the bolt circle diameter, the diameter of the bolt holes and the number of holes. Everything else about a flange — the neck, the bore, the facing — can differ without preventing assembly, and none of it appears in the DIN Norm flange dimensions table.

Of the five, the bolt circle is the one that decides the job. Two flanges with the same outside diameter but different bolt circles will not mate, which is why the DIN Norm flange dimensions table should be read across the row rather than glanced at for the outside diameter alone.

Same Nominal Size, Different Rating

A nominal diameter is not a flange specification. DN 100 appears in every pressure rating from PN 6 upwards, and the DIN Norm flange dimensions table gives a different set of figures for each one. As the rating rises the flange grows thicker, the bolt circle moves outwards and the bolts get larger or more numerous, and each step is a separate row of the DIN Norm flange dimensions table.

This is the most common ordering error: a valve is specified as DN 100 without a PN, arrives with the wrong flange, and cannot be fitted. Quote the nominal diameter and the pressure rating together, both taken from the same row of the DIN Norm flange dimensions table.

Where PN 10 and PN 16 Are Identical

There is one convenient overlap worth knowing. Up to DN 150, PN 10 and PN 16 flanges share the same connecting dimensions, so a PN 10 counter-flange accepts a PN 16 flange and the other way round. The DIN Norm flange dimensions table shows the two ratings running with identical figures over that range.

They separate at DN 200. There the outside diameter and bolt circle still agree, but PN 10 carries eight bolts and PN 16 carries twelve, so the hole positions no longer coincide. Anyone who has learned the overlap at small sizes and assumes it continues will meet that difference on site, which is why the DIN Norm flange dimensions table is checked rather than remembered.

Bolt Holes Straddle the Centreline

By convention the holes are positioned so that they straddle the principal centrelines rather than sitting on them. A flange with an even number of holes therefore has no hole at top dead centre, which keeps the vertical and horizontal axes clear for level gauges, drains and supports. The hole count in the DIN Norm flange dimensions table is what tells you whether that is the case.

It also means a flange can only be rotated in steps. With eight holes the increment is 45 degrees, so a valve with an offset actuator or a lever that has to clear a wall must be planned around those steps. The hole count in the DIN Norm flange dimensions table is what sets the increment.

Facings and Gaskets

The DIN Norm flange dimensions table gives connecting dimensions; the facing is specified separately. Form B1 with a 2 mm raised face is the usual choice for the steel flanges listed in the DIN Norm flange dimensions table, while flat-faced flanges are used with cast iron bodies, where a raised face would put a bending load on a brittle material.

Gasket selection follows from the facing. A raised face takes a gasket that sits inside the bolt circle, and a flat face normally takes a full-face gasket drilled for the bolts. Take the gasket outside diameter from the facing dimensions rather than from the flange outside diameter listed in the DIN Norm flange dimensions table.

The Table Applies to Every Flange Type

Weld neck, slip-on, blind, threaded and loose flanges with collars all share the same connecting dimensions at a given DN and PN. The DIN Norm flange dimensions table therefore serves all of them, and the type affects the pipe-side connection and the strength of the joint rather than the bolt pattern.

That is useful when a valve has to meet an existing line: the counter-flange can be any type, as long as its row in the DIN Norm flange dimensions table matches. A blind flange for a pressure test is chosen the same way.

Bolting and Tightening

The hole diameter in the DIN Norm flange dimensions table is not the bolt diameter. A hole of 18 mm is drilled for an M16 bolt, and the clearance is deliberate. Order bolts by their thread size, not by the hole diameter given in the DIN Norm flange dimensions table.

Bolt length is set by two flange thicknesses, the gasket, washers and the nut, so the thickness column matters as much as the hole pattern. Tighten in a star sequence in at least three passes: a joint pulled up on one side first will leak, however correct the parts taken from the DIN Norm flange dimensions table.

Measuring a Flange That Is Already Installed

Bolt circle diameter is rarely easy to measure directly because the centre is occupied by the pipe. With an even number of holes, measure centre to centre across two opposite holes. With an odd number, measure from the centre of one hole to the middle of the gap opposite and take twice that distance before matching it against the DIN Norm flange dimensions table.

Then count the holes, measure one hole and the flange outside diameter, and find the row of the DIN Norm flange dimensions table that matches all three. Identifying an unmarked flange from a single dimension is guesswork; three dimensions together are conclusive.

Cast Iron and Steel Are Not Interchangeable

The dimensions in the DIN Norm flange dimensions table are shared by cast iron and steel flanges at the same rating, but the pressure-temperature behaviour behind them is not. Cast iron loses capacity quickly with temperature and tolerates no bending, whatever the DIN Norm flange dimensions table says about the fit, so a steel flange bolted tightly against a cast iron one can crack it.

Where the two meet, use a full-face gasket, tighten to the lower of the two torque figures and support the pipework so that no weight hangs on the joint. The DIN Norm flange dimensions table confirms the parts fit; the materials still have to be checked separately.

Related Tables

The DIN Norm flange dimensions table covers one half of a mixed-standard job. The ASME B16.5 flange dimensions give the same five figures for the inch series, the ANSI Class to DIN PN conversion matches the ratings, and the inch to mm metric conversion table puts both dimension sets in the same unit. Together they answer whether a valve fits, not only whether it is strong enough.

DIN flange dimensions table for PN 6 to PN 150 — PDF preview — DIN norm flange dimensions, DN 10 to DN 250.

Reference: DIN — the German standards body behind the PN flange series

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DN	PN 6							PN 10							PN 16							PN 25
DN	ØD	ØF	f	b	Øk	Øl	n	ØD	ØF	f	b	Øk	Øl	n	ØD	ØF	f	b	Øk	Øl	n	ØD	ØF	f	b	Øk	Øl	n
10	75	35	2	12	50	11	4	90	40	2	14	60	14	4	90	40	2	14	60	14	4	90	40	2	14	60	14	4
15	80	40	2	12	55	11	4	95	45	2	14	65	14	4	95	45	2	14	65	14	4	95	45	2	16	65	14	4
20	90	50	2	14	65	11	4	105	58	2	16	75	14	4	105	58	2	16	75	14	4	105	58	2	16	75	14	4
25	100	60	2	14	75	11	4	115	68	2	16	85	14	4	115	68	2	16	85	14	4	115	68	2	18	85	14	4
32	120	70	2	14	90	14	4	140	78	2	16	100	18	4	140	78	2	16	100	18	4	140	78	2	18	100	18	4
40	130	80	3	14	100	14	4	150	88	3	16	110	18	4	150	88	3	16	110	18	4	150	88	3	18	110	18	4
50	140	90	3	14	110	14	4	165	102	3	18	125	18	4	165	102	3	18	125	18	4	165	102	3	20	125	18	4
65	160	110	3	14	130	14	4	185	122	3	18	145	18	4	185	122	3	18	145	18	4	185	122	3	22	145	18	8
80	190	128	3	16	150	18	4	200	138	3	20	160	18	8	200	138	3	20	160	18	8	200	138	3	24	160	18	8
100	210	148	3	16	170	18	4	220	158	3	20	180	18	8	220	158	3	20	180	18	8	235	162	3	24	190	22	8
125	240	178	3	18	200	18	8	250	188	3	22	210	18	8	250	188	3	22	210	18	8	270	188	3	26	220	26	8
150	265	202	3	18	225	18	8	285	212	3	22	240	22	8	285	212	3	22	240	22	8	300	218	3	28	250	26	8
200	320	258	3	20	280	18	8	340	268	3	24	295	22	8	340	268	3	24	295	22	12	360	278	3	30	310	26	12
250	375	312	3	22	335	18	12	395	320	3	26	350	22	12	405	320	3	26	355	26	12	425	335	3	32	370	30	12

DN	PN 40							PN 64							PN 100							PN 150
DN	ØD	ØF	f	b	Øk	Øl	n	ØD	ØF	f	b	Øk	Øl	n	ØD	ØF	f	b	Øk	Øl	n	ØD	ØF	f	b	Øk	Øl	n
10	90	40	2	16	60	14	4	100	40	2	20	70	14	4	100	40	2	20	70	14	4	100	40	2	20	70	14	4
15	95	45	2	16	65	14	4	105	45	2	20	75	14	4	105	45	2	20	75	14	4	105	45	2	20	75	14	4
20	105	58	2	16	75	14	4	130	58	2	24	90	18	4	130	58	2	24	90	18	4	130	58	2	24	90	18	4
25	115	68	2	18	85	14	4	140	65	2	24	100	18	4	140	65	2	24	100	18	4	140	65	2	24	100	18	4
32	140	78	2	18	100	18	4	155	75	2	24	110	23	4	155	75	2	24	110	23	4	155	75	2	24	110	23	4
40	150	88	3	18	110	18	4	170	85	3	26	125	23	4	170	85	3	26	125	23	4	170	85	3	28	125	23	4
50	165	102	3	20	125	18	4	180	95	3	26	135	23	4	195	95	3	28	145	27	4	195	95	3	30	145	27	4
65	185	122	3	22	145	18	8	205	120	3	26	160	23	8	220	120	3	30	170	27	8	220	105	3	34	170	27	8
80	200	138	3	24	160	18	8	215	130	3	28	170	23	8	230	130	3	32	180	27	8	230	125	3	36	180	27	8
100	235	162	3	24	190	22	8	250	160	3	30	200	27	8	265	160	3	36	210	30	8	265	145	3	40	210	30	8
125	270	188	3	26	220	26	8	295	185	3	34	240	30	8	315	185	3	40	250	33	8	315	185	3	44	250	33	8
150	300	218	3	28	250	26	8	345	215	3	36	280	33	8	355	215	3	44	290	33	12	355	215	3	50	290	33	12
200	375	285	3	34	320	30	12	415	270	3	42	345	36	12	430	270	3	52	360	36	12	430	260	3	60	360	36	12
250	450	345	3	38	385	33	12	470	325	3	46	400	36	12	505	325	3	60	430	39	12	515	325	3	68	430	42	12

DN	PN 6							PN 10							PN 16							PN 25
DN	ØD	ØF	f	b	Øk	Øl	n	ØD	ØF	f	b	Øk	Øl	n	ØD	ØF	f	b	Øk	Øl	n	ØD	ØF	f	b	Øk	Øl	n
10	75	35	2	12	50	11	4	90	40	2	14	60	14	4	90	40	2	14	60	14	4	90	40	2	14	60	14	4
15	80	40	2	12	55	11	4	95	45	2	14	65	14	4	95	45	2	14	65	14	4	95	45	2	16	65	14	4
20	90	50	2	14	65	11	4	105	58	2	16	75	14	4	105	58	2	16	75	14	4	105	58	2	16	75	14	4
25	100	60	2	14	75	11	4	115	68	2	16	85	14	4	115	68	2	16	85	14	4	115	68	2	18	85	14	4
32	120	70	2	14	90	14	4	140	78	2	16	100	18	4	140	78	2	16	100	18	4	140	78	2	18	100	18	4
40	130	80	3	14	100	14	4	150	88	3	16	110	18	4	150	88	3	16	110	18	4	150	88	3	18	110	18	4
50	140	90	3	14	110	14	4	165	102	3	18	125	18	4	165	102	3	18	125	18	4	165	102	3	20	125	18	4
65	160	110	3	14	130	14	4	185	122	3	18	145	18	4	185	122	3	18	145	18	4	185	122	3	22	145	18	8
80	190	128	3	16	150	18	4	200	138	3	20	160	18	8	200	138	3	20	160	18	8	200	138	3	24	160	18	8
100	210	148	3	16	170	18	4	220	158	3	20	180	18	8	220	158	3	20	180	18	8	235	162	3	24	190	22	8
125	240	178	3	18	200	18	8	250	188	3	22	210	18	8	250	188	3	22	210	18	8	270	188	3	26	220	26	8
150	265	202	3	18	225	18	8	285	212	3	22	240	22	8	285	212	3	22	240	22	8	300	218	3	28	250	26	8
200	320	258	3	20	280	18	8	340	268	3	24	295	22	8	340	268	3	24	295	22	12	360	278	3	30	310	26	12
250	375	312	3	22	335	18	12	395	320	3	26	350	22	12	405	320	3	26	355	26	12	425	335	3	32	370	30	12

DN	PN 40							PN 64							PN 100							PN 150
DN	ØD	ØF	f	b	Øk	Øl	n	ØD	ØF	f	b	Øk	Øl	n	ØD	ØF	f	b	Øk	Øl	n	ØD	ØF	f	b	Øk	Øl	n
10	90	40	2	16	60	14	4	100	40	2	20	70	14	4	100	40	2	20	70	14	4	100	40	2	20	70	14	4
15	95	45	2	16	65	14	4	105	45	2	20	75	14	4	105	45	2	20	75	14	4	105	45	2	20	75	14	4
20	105	58	2	16	75	14	4	130	58	2	24	90	18	4	130	58	2	24	90	18	4	130	58	2	24	90	18	4
25	115	68	2	18	85	14	4	140	65	2	24	100	18	4	140	65	2	24	100	18	4	140	65	2	24	100	18	4
32	140	78	2	18	100	18	4	155	75	2	24	110	23	4	155	75	2	24	110	23	4	155	75	2	24	110	23	4
40	150	88	3	18	110	18	4	170	85	3	26	125	23	4	170	85	3	26	125	23	4	170	85	3	28	125	23	4
50	165	102	3	20	125	18	4	180	95	3	26	135	23	4	195	95	3	28	145	27	4	195	95	3	30	145	27	4
65	185	122	3	22	145	18	8	205	120	3	26	160	23	8	220	120	3	30	170	27	8	220	105	3	34	170	27	8
80	200	138	3	24	160	18	8	215	130	3	28	170	23	8	230	130	3	32	180	27	8	230	125	3	36	180	27	8
100	235	162	3	24	190	22	8	250	160	3	30	200	27	8	265	160	3	36	210	30	8	265	145	3	40	210	30	8
125	270	188	3	26	220	26	8	295	185	3	34	240	30	8	315	185	3	40	250	33	8	315	185	3	44	250	33	8
150	300	218	3	28	250	26	8	345	215	3	36	280	33	8	355	215	3	44	290	33	12	355	215	3	50	290	33	12
200	375	285	3	34	320	30	12	415	270	3	42	345	36	12	430	270	3	52	360	36	12	430	260	3	60	360	36	12
250	450	345	3	38	385	33	12	470	325	3	46	400	36	12	505	325	3	60	430	39	12	515	325	3	68	430	42	12