Dimension table · Gaskets

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

DIN EN 1514-1 is the current dimensional standard for flat gaskets used with flanges to DIN EN 1092-1. The table shows the dimensions of form IBC (Inner 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: DIN 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 DIN 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.

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

* 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.

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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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Technical basis: DIN 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. Editorially reviewed: July 2026. Standards and manufacturer status considered: July 2026.