Dimension table · Gaskets

Flat gaskets to EN 1514-1: dimension table form IBC

EN 1514-1 is the current dimensional standard for flat gaskets used with flanges to EN 1092-1. The table shows the dimensions of form IBC (Inside Bolt Circle) – the standard case for flanges with a raised face: inside diameter d1 by nominal size, outside diameter d2 by pressure rating. The ring sits inside the bolt circle and centres itself on the bolts.

Standard: EN 1514-1
Status: Currently valid (replaces DIN 2690–2692)
Form: IBC – inside the bolt circle
Scope: PN 2.5 – PN 40 (table)
Nominal sizes: DN 10 – DN 500 (table)

Besides form IBC, the standard also covers other forms matched to the flange's sealing face: form FF (Full Face) for plain form A flanges, form TG for tongue and groove, and form SR for spigot and recess. The mapping is explained in the gaskets overview. Typical ordering information: "Gasket EN 1514-1, form IBC, DN 250, PN 16, material, s = 2 mm".

Tip: use Ctrl/Cmd + F to jump straight to the nominal size you need.

The standard names dimensions. What is listed here, we carry – from stock or to order; how quickly a size is available we clarify on request.

Flat gaskets EN 1514-1, form IBC: inside Ø d1 and outside Ø d2 by PN rating, all dimensions in millimetres – availability: from stock or to order
DN	Inside Ø d1	PN 2.5	PN 6	PN 10	PN 16	PN 25	PN 40
10	18	39	39	46	46	46	46
15	22	44	44	51	51	51	51
20	27	54	54	61	61	61	61
25	34	64	64	71	71	71	71
32	43	76	76	82	82	82	82
40	49	86	86	92	92	92	92
50	61	96	96	107	107	107	107
60*	72	106	106	117	117	117	117
65	77	116	116	127	127	127	127
80	89	132	132	142	142	142	142
100	115	152	152	162	162	168	168
125	141	182	182	192	192	194	194
150	169	207	207	218	218	224	224
200	220	262	262	273	273	284	290
250	273	317	317	328	329	340	352
300	324	373	373	378	384	400	417
350	356	423	423	438	444	457	474
400	407	473	473	489	495	514	546
450	458	528	528	539	555	564	571
500	508	578	578	594	617	624	628

* DN 60 is a special nominal size provided only for cast-iron flanges. For PN 1, use the PN 2.5 dimensions. Nominal sizes above DN 500 will be added once verified against the manufacturer source. For a few nominal sizes the EN dimensions differ by a few millimetres from the old DIN 2690 (e.g. d1 at DN 20, 25, 80, and d2 in PN 25/40 from DN 125 upward) – when replacing gaskets in existing plant it is worth checking against the DIN 2690 dimension table.

Find the matching gasket directly

We carry flat gaskets to EN dimensions from stock – cut-to-size and special materials on request. The overview shows which material suits which medium and temperature.

Overview

Flat gaskets explained

Materials, forms, selection and installation.

Existing plant

DIN 2690 dimension table

Withdrawn predecessor standard – for identification and maintenance.

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DN, PN, form, material and thickness – we supply the matching part.

Frequently asked questions

Where do I find the dimensions of a flat gasket to EN 1514-1?

The dimension table on this page is the size chart of the flat gasket to EN 1514-1: gasket dimensions per DN and PN for the IBC and FF forms.

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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 manufacturers’ and suppliers’ documentation and against our own product data. What you see here is what the market supplies, checked against the standard – or calculated by us. How we select our sources and keep them up to date: About this knowledge.

Technical basis: EN 1514-1 (dimensions form IBC); figures taken from the manufacturer's dimension table KLINGER Information 70.1.1, verified cell by cell against the original and maintained in our own data layer. All information without guarantee – the current standard text and the manufacturer's technical data sheets always prevail. Selection of values follows our delivery and stock programme; compiled from our own inventory management and long-standing trading practice, cross-checked against publicly available manufacturer data. This table does not replace the standard text – the currently valid standard always prevails.

DN	Inside Ø d1	PN 2.5	PN 6	PN 10	PN 16	PN 25	PN 40
10	18	39	39	46	46	46	46
15	22	44	44	51	51	51	51
20	27	54	54	61	61	61	61
25	34	64	64	71	71	71	71
32	43	76	76	82	82	82	82
40	49	86	86	92	92	92	92
50	61	96	96	107	107	107	107
60*	72	106	106	117	117	117	117
65	77	116	116	127	127	127	127
80	89	132	132	142	142	142	142
100	115	152	152	162	162	168	168
125	141	182	182	192	192	194	194
150	169	207	207	218	218	224	224
200	220	262	262	273	273	284	290
250	273	317	317	328	329	340	352
300	324	373	373	378	384	400	417
350	356	423	423	438	444	457	474
400	407	473	473	489	495	514	546
450	458	528	528	539	555	564	571
500	508	578	578	594	617	624	628

DN	Inside Ø d1	PN 2.5	PN 6	PN 10	PN 16	PN 25	PN 40
10	18	39	39	46	46	46	46
15	22	44	44	51	51	51	51
20	27	54	54	61	61	61	61
25	34	64	64	71	71	71	71
32	43	76	76	82	82	82	82
40	49	86	86	92	92	92	92
50	61	96	96	107	107	107	107
60*	72	106	106	117	117	117	117
65	77	116	116	127	127	127	127
80	89	132	132	142	142	142	142
100	115	152	152	162	162	168	168
125	141	182	182	192	192	194	194
150	169	207	207	218	218	224	224
200	220	262	262	273	273	284	290
250	273	317	317	328	329	340	352
300	324	373	373	378	384	400	417
350	356	423	423	438	444	457	474
400	407	473	473	489	495	514	546
450	458	528	528	539	555	564	571
500	508	578	578	594	617	624	628

DN	Inside Ø d1	PN 2.5	PN 6	PN 10	PN 16	PN 25	PN 40
10	18	39	39	46	46	46	46
15	22	44	44	51	51	51	51
20	27	54	54	61	61	61	61
25	34	64	64	71	71	71	71
32	43	76	76	82	82	82	82
40	49	86	86	92	92	92	92
50	61	96	96	107	107	107	107
60*	72	106	106	117	117	117	117
65	77	116	116	127	127	127	127
80	89	132	132	142	142	142	142
100	115	152	152	162	162	168	168
125	141	182	182	192	192	194	194
150	169	207	207	218	218	224	224
200	220	262	262	273	273	284	290
250	273	317	317	328	329	340	352
300	324	373	373	378	384	400	417
350	356	423	423	438	444	457	474
400	407	473	473	489	495	514	546
450	458	528	528	539	555	564	571
500	508	578	578	594	617	624	628