Dimension table · Flanges · Type 02/04 + collar 32/34

Loose flanges type 02 and 04: dimensions to EN 1092-1

The two-piece loose flange systems to EN 1092-1 in one table per pressure rating: loose flange type 02 with weld-on plate collar 32 (PN 6 to PN 40) and loose flange type 04 with welding neck collar 34 (PN 10 to PN 40) – with bore B₂/B₃, flange thickness C₁, collar thickness F, collar height H₂, the connection dimensions D, K, n × L, d₁ and indicative weights per part. All dimensions in millimetres, dimension letters to EN 1092-1.

Dimension finder: dimensioned drawing for one specific size

Choose the version, pressure rating and nominal size – the drawing and dimension table then show exactly this version, with the values written directly in the drawing instead of just the dimension letters. The tables for the nominal sizes covered here are further down the page. Loose flange with weld-on plate collar and Loose flange with welding neck collar – the differences are explained further down.

Version

Loose flange with weld-on plate collar (Type 02 + 32) Loose flange with welding neck collar (Type 04 + 34)

Pressure rating

Nominal size

EN 1092-1 covers the greyed-out sizes. Our dimension overview does not show them at present.

Loose flange with weld-on plate collar · Type 02+32 · DN 100 · PN 16

Dimensioned drawing of the loose flange type 02 with weld-on plate collar type 32 in DN 100 PN 16: at the top the view, at the bottom the full section of both parts. The loose flange is a ring without a sealing face – it only transmits the bolt force and can be turned until the bolt holes line up with the mating flange. The seal is made on the collar (outside diameter ⌀158 mm). In the section the two parts are drawn separated one above the other and hatched in opposite directions, so that it is clear at a glance that they are two components. The gap between them is for clarity and not a dimension – when installed the ring rests on the collar. The weld-on plate collar type 32 is a flat disc that is slipped over the pipe and welded. At the collar-side edge of bore B there is the chamfer E 6 mm; it lets the ring tilt over the fillet and weld of the collar. The standard only dimensions its length; the angle drawn is a documented convention. The bolt hole is shown rotated into the section plane (revolved section), where the hatching is interrupted; it is dimensioned in the view. Both views to the same scale on a common centre line. Dimension letters to EN 1092-1 in brackets after the value. Drawing calculated from the nominal dimensions.

Technical basis: DIN EN 1092-1:2018-12. Zickwolff has prepared this presentation for practical use, with our own structure, our own designations and a statement of what kind of value each figure is. The original standard governs normative requirements.

Loose flange type 02 with weld-on plate collar type 32, DN 100 PN 16 – nominal dimensions to EN 1092-1, unit given with each value
Property	Value	Type of information
basic data
nominal size	DN 100	standard dimension
pressure rating	PN 16	standard dimension
weight of loose flange (guide value, steel)	4.2 kg	guide value
weight of collar (guide value, steel)	1.3 kg	guide value
availability	from stock or procured	trade information
connecting dimensions The dimensions that decide the fit with the mating flange.
outside diameter D	220 mm	standard dimension
bolt circle diameter K	180 mm	standard dimension
bolt holes n × L	8 × ⌀18 mm	standard dimension
bolt size	M16	standard dimension
flange thickness C1	22 mm	standard dimension
bore of the loose flange B	120 mm – inside diameter of the ring; it sits with clearance over the collar and can be turned for alignment	standard dimension
chamfer at the bore E	6 mm – axial length at the collar-side edge of bore B; the standard does not specify the angle	standard dimension
collar The collar carries the sealing face – the loose flange only transmits the bolt load.
collar outside diameter d1	158 mm – outside diameter of the collar; the seal is made on it	standard dimension
collar thickness F	18 mm	standard dimension

Without an entry in the “Type of information” column: standard dimension. A dimension that EN 1092-1 specifies for this size.

Where exactly it is measured

outside diameter D: largest diameter of the flange plate, measured across the edge
bolt circle diameter K: diameter of the circle through the centres of the bolt holes – with an even number of holes, from hole centre to opposite hole centre
flange thickness C1: measure the thickness of the loose ring, not of the collar
bore of the loose flange B: inside diameter of the ring – it sits with clearance over the collar and can be turned
collar outside diameter d1: outside diameter of the collar – the seal is made on it, not on the loose flange
collar thickness F: thickness of the collar disc
chamfer at the bore E: axial length of the chamfer at the collar-side edge of bore B – it faces the collar

Tolerances (limit deviations): what range the standard permits

For each dimension the range that EN 1092-1 permits is given – minimum and maximum instead of the deviation that would first have to be worked out. In the drawing this is shortened to tolerance – the word everyone uses in practice. In technical terms the two values given are the limit dimensions of the dimension, their distance is the tolerance and the deviations from the nominal size are the limit deviations. The basis is Table 22 and Table 23 – where the standard specifies nothing, that is stated.

These dimensions have two limit deviations – which one applies depends on the specific part

For the following dimensions the standard specifies two limit deviations. Which one applies does not depend on the nominal size but on the specific part. Both cases are therefore written out.

This answer determines: flange thickness C1.

flange thickness C1 – measure the thickness of the loose ring, not of the collar

Is the flange machined on both faces? (this refers to the two annular faces of the flange plate: the sealing face at the front and the nut bearing face at the back, on which the nuts sit. Machined on both faces means both are faced flat – with fine turning marks and an even sheen. A look at the back is enough: turned bright, or left as-forged with forging or rolling skin)

machined on both faces flange thickness limit dimensions 20.5 to 23.5 mm (±1.5 mm)
machined on the front face only, or not machined flange thickness limit dimensions 20.5 to 26 mm (+4 / −1.5 mm)
I don't know both cases remain

Further properties with limit deviations

These properties have no nominal dimension in the dimension table, but the standard limits them. For incoming inspection they are often the decisive ones – they are what makes a bolted joint fail on site.

distance between adjacent bolt holes	limit deviation ±1 mm
eccentricity of bolt circle to bore B	at most 2 mm
parallelism of nut bearing surface and bearing face on the collar	machined: at most 1° · not machined: at most 2°

Measuring on the part: the dimensions in the picture

Every dimension has its reason – whoever knows why they measure, measures better.

Sources of the limit deviations (10 entries)

flange thickness (machined on both faces) – Table 22, flange thickness C1, C2, C3, C4, all types (machined on both faces), over 18 to 50 mm thickness
flange thickness (machined on the front face only, or not machined) – Table 22, flange thickness C1, C2, C3, C4, all types (machined on the front face only), type 02 and 04 (unmachined), over 18 to 50 mm thickness
distance between adjacent bolt holes – Table 22, centre to centre of adjacent bolt holes, all types, bolt size M10 to M24
eccentricity of bolt circle to bore B – Table 22, eccentricity of machined sealing face diameter, all types, over DN 65 (footnote d)
parallelism of nut bearing surface and bearing face on the collar (machined) – Table 22, parallelism between nut bearing face and flange sealing face, all types (machined bearing face), all DN
parallelism of nut bearing surface and bearing face on the collar (not machined) – Table 22, parallelism between nut bearing face and flange sealing face, all types (unmachined bearing face), all DN
outside diameter – Table 22, outside diameter D, all other types, up to DN 150
bolt circle diameter – Table 22, bolt circle diameter K, all types, bolt size M10 to M24
bolt holes – Table 22, hole diameter L, all types, bolt size M10 to M24
collar outside diameter – Table 22, sealing face diameter d1, all types, up to DN 250

This information does not replace the standard itself. Only the limit deviations for the size selected here are reproduced. In full – for all nominal sizes, pressure ratings and flange types – they are given in DIN EN 1092-1:2018-12, Table 22 and Table 23. Where to obtain it: DIN Media.

Why limit deviations exist at all and how to read them is explained on a page of its own: Tolerances and limit deviations.

Dimensions are nominal dimensions to EN 1092-1 and do not replace the data sheet of the actual item. No statement about pressure or temperature suitability and no statement about the material. DN is a reference number, not a dimension in millimetres – the inside diameter differs from it. Direct link to this size

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

How to measure correctly

Four measurements identify a flange: outside diameter D, bolt circle K, the number and diameter of the bolt holes n × L, and the flange thickness C. Measure the bolt circle from the centre of one hole to the centre of the opposite hole – or, more easily, from the outer edge of one hole to the inner edge of the opposite one, which gives the same value. Measure the flange thickness from the sealing face to the back of the plate: a raised face is already included in C.

outside diameter D: largest diameter of the flange plate, measured across the edge
bolt circle diameter K: diameter of the circle through the centres of the bolt holes – with an even number of holes, from hole centre to opposite hole centre
bolt holes n × L: count the holes, then measure the diameter of one hole – the hole is always larger than the bolt (example: hole 18 mm, bolt M16)
raised-face diameter d1: diameter of the raised face, measured across its outer edge
distance between adjacent bolt holes: with equal holes, measure from the outer edge of one hole to the inner edge of the opposite hole (in the measuring direction that is the same side) – half a hole here cancels half a hole there: exactly the centre distance. Applies to the bolt circle K as to the hole spacing, as long as both holes are the same size
flange thickness C1: measure the thickness of the loose ring, not of the collar
bore of the loose flange B: inside diameter of the ring – it sits with clearance over the collar and can be turned
collar outside diameter d1: outside diameter of the collar – the seal is made on it, not on the loose flange
collar thickness F: thickness of the collar disc
collar height H2: overall height of the welding neck collar including the neck
hub diameter of the collar N1: measure at the transition to the collar disc, where the neck is thickest – not at the weld end
wall thickness at the weld end of the collar S: take at the end face of the neck – that is the thin end
chamfer at the bore E: axial length of the chamfer at the collar-side edge of bore B – it faces the collar

A measured value rarely matches the table exactly: EN 1092-1 allows ±1.0 mm on the bolt circle (bolts up to M24), ±2.0 mm on the outside diameter up to DN 150 and +1.0/−1.3 mm on a flange thickness up to 18 mm. The dimension finder on this page shows the limit deviations for each size.

Connection dimensions are the same across types: outside diameter D, bolt circle (also called bolt circle diameter/BCD or pitch circle diameter/PCD) 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; type-specific here are the bore B₂/B₃, flange thickness C₁, collar thickness F and collar height H₂.

In the loose flange system, the collar welded to the pipe provides the sealing function, while the loose flange turns freely on the pipe and transmits only the bolt loads. That makes assembly easy (bolt-hole patterns can always be aligned) and allows an economical material mix: only the media-wetted collar needs to be stainless steel, while the flange can be galvanised steel. Type 02 pairs with the weld-on plate collar 32 (fillet weld), type 04 with the butt-welded welding neck collar 34. For an overview of all styles, see our page flange types international; the other type pages: type 11, type 05, type 01 and type 13.

The column headers use the dimension letters from the drawings: A = pipe outside diameter, n × ØL = number × diameter of bolt holes, M = bolt size, d₁ = collar outside diameter/sealing face, K = bolt circle, D = outside diameter of the loose flange, B₂/B₃ = bore of the loose flange, C₁ = flange thickness, F = collar thickness, H₂ = collar height (welding neck collar 34 only).

SYSTEM A · TYPE 02 + COLLAR 32 · DN 10 – DN 800

Loose flange type 02 with weld-on plate collar 32 (PN 6–40)

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

PN 6 – dimension table

For PN 6, EN 1092-1 lists a complete range of sizes - our dimension overview does not show their dimensions at present. Tell us the nominal size and we will tell you what we know about it. Some of these sizes are listed below under "Further deliverable dimensions".

PN 10 – dimension table (DN 15–600)

DN	Pipe OD (mm)	n × ØL (mm)	M ¹	Ød₁ (mm) ²	ØK (mm)	ØD (mm)	ØB₂ (mm) ³	C₁ (mm) ⁴	F (mm) ⁵	Flange wt. (kg) ⁷	Collar wt. (kg) ⁷
15	21.3	4 × 14	M12	45	65	95	25	14	12	0.654	0.114
20	26.9	4 × 14	M12	58	75	105	31	16	14	0.909	0.225
25	33.7	4 × 14	M12	68	85	115	38	16	14	1.08	0.296
32	42.4	4 × 18	M16	78	100	140	47	18	14	1.77	0.362

Show full table · more than 10 rows

Loose flange type 02 with collar 32 to EN 1092-1, PN 10 – connection and type dimensions in mm, weights in kg – availability: from stock or procured – DN 700/800: collar 32 by agreement (footnote 6)
DN	Pipe OD (mm)	n × ØL (mm)	M ¹	Ød₁ (mm) ²	ØK (mm)	ØD (mm)	ØB₂ (mm) ³	C₁ (mm) ⁴	F (mm) ⁵	Flange wt. (kg) ⁷	Collar wt. (kg) ⁷
15	21.3	4 × 14	M12	45	65	95	25	14	12	0.654	0.114
20	26.9	4 × 14	M12	58	75	105	31	16	14	0.909	0.225
25	33.7	4 × 14	M12	68	85	115	38	16	14	1.08	0.296
32	42.4	4 × 18	M16	78	100	140	47	18	14	1.77	0.362
40	48.3	4 × 18	M16	88	110	150	53	18	14	2.02	0.457
50	60.3	4 × 18	M16	102	125	165	65	20	16	2.52	0.653
65 ⁸	76.1	8 × 18	M16	122	145	185	81	20	16	3.05	0.876
80	88.9	8 × 18	M16	138	160	200	94	20	16	3.48	1.07
100	114.3	8 × 18	M16	158	180	220	120	22	18	4.20	1.28
125	139.7	8 × 18	M16	188	210	250	145	22	18	5.21	1.70
150	168.3	8 × 22	M20	212	240	285	174	24	20	6.89	1.96
200	219.1	8 × 22	M20	268	295	340	226	24	20	8.87	2.81
250	273.0	12 × 22	M20	320	350	395	281	26	22	11.2	3.52
300	323.9	12 × 22	M20	370	400	445	333	26	22	12.8	4.02
350	355.6	16 × 22	M20	430	460	505	365	30	22	19.4	7.55
400	406.4	16 × 26	M24	482	515	565	416	32	24	26.4	9.38
450	457	20 × 26	M24	532	565	615	467	36	24	32.2	10.3
500	508	20 × 26	M24	585	620	670	519	38	26	38.5	12.6
600	610	20 × 30	M27	685	725	780	622	42	26	52.2	14.3

PN 16 – dimension table (DN 50–600)

Loose flange type 02 with collar 32 to EN 1092-1, PN 16 – connection and type dimensions in mm, weights in kg – availability: from stock or procured – DN 700/800: collar 32 by agreement (footnote 6)
DN	Pipe OD (mm)	n × ØL (mm)	M ¹	Ød₁ (mm) ²	ØK (mm)	ØD (mm)	ØB₂ (mm) ³	C₁ (mm) ⁴	F (mm) ⁵	Flange wt. (kg) ⁷	Collar wt. (kg) ⁷
50	60.3	4 × 18	M16	102	125	165	65	20	16	2.52	0.653
65 ⁸	76.1	8 × 18	M16	122	145	185	81	20	16	3.05	0.876
80	88.9	8 × 18	M16	138	160	200	94	20	16	3.48	1.07
100	114.3	8 × 18	M16	158	180	220	120	22	18	4.20	1.28
125	139.7	8 × 18	M16	188	210	250	145	22	18	5.21	1.70
150	168.3	8 × 22	M20	212	240	285	174	24	20	6.89	1.96
200	219.1	12 × 22	M20	268	295	340	226	26	20	9.31	2.81
250	273.0	12 × 26	M24	320	355	405	281	29	22	13.5	3.52
300	323.9	12 × 26	M24	378	410	460	333	32	24	18.0	5.27
350	355.6	16 × 26	M24	438	470	520	365	35	26	27.0	10.1
400	406.4	16 × 30	M27	490	525	580	416	38	28	34.6	12.3
600	610	20 × 36	M33	725	770	840	622	55	32	98.8	28.7

PN 25 – dimension table (DN 200)

Loose flange type 02 with collar 32 to EN 1092-1, PN 25 – connection and type dimensions in mm, weights in kg – availability: from stock or procured – DN 700/800: collar 32 by agreement (footnote 6)
DN	Pipe OD (mm)	n × ØL (mm)	M ¹	Ød₁ (mm) ²	ØK (mm)	ØD (mm)	ØB₂ (mm) ³	C₁ (mm) ⁴	F (mm) ⁵	Flange wt. (kg) ⁷	Collar wt. (kg) ⁷
200	219.1	12 × 26	M24	278	310	360	226	32	26	13.8	4.52

PN 40 – dimension table (DN 15–300)

DN	Pipe OD (mm)	n × ØL (mm)	M ¹	Ød₁ (mm) ²	ØK (mm)	ØD (mm)	ØB₂ (mm) ³	C₁ (mm) ⁴	F (mm) ⁵	Flange wt. (kg) ⁷	Collar wt. (kg) ⁷
15	21.3	4 × 14	M12	45	65	95	25	14	12	0.654	0.114
20	26.9	4 × 14	M12	58	75	105	31	16	14	0.909	0.225
25	33.7	4 × 14	M12	68	85	115	38	16	14	1.08	0.296
32	42.4	4 × 18	M16	78	100	140	47	18	14	1.77	0.362

Show full table · more than 10 rows

Loose flange type 02 with collar 32 to EN 1092-1, PN 40 – connection and type dimensions in mm, weights in kg – availability: from stock or procured
DN	Pipe OD (mm)	n × ØL (mm)	M ¹	Ød₁ (mm) ²	ØK (mm)	ØD (mm)	ØB₂ (mm) ³	C₁ (mm) ⁴	F (mm) ⁵	Flange wt. (kg) ⁷	Collar wt. (kg) ⁷
15	21.3	4 × 14	M12	45	65	95	25	14	12	0.654	0.114
20	26.9	4 × 14	M12	58	75	105	31	16	14	0.909	0.225
25	33.7	4 × 14	M12	68	85	115	38	16	14	1.08	0.296
32	42.4	4 × 18	M16	78	100	140	47	18	14	1.77	0.362
40	48.3	4 × 18	M16	88	110	150	53	18	14	2.02	0.457
50	60.3	4 × 18	M16	102	125	165	65	20	16	2.65	0.653
65	76.1	8 × 18	M16	122	145	185	81	22	16	3.36	0.876
80	88.9	8 × 18	M16	138	160	200	94	24	18	4.18	1.20
100	114.3	8 × 22	M20	162	190	235	120	26	20	5.87	1.58
125	139.7	8 × 26	M24	188	220	270	145	28	22	7.95	2.08
150	168.3	8 × 26	M24	218	250	300	174	30	24	9.97	2.73
200	219.1	12 × 30	M27	285	320	375	226	36	28	17.4	5.55
300	323.9	16 × 33	M30	410	450	515	333	52	34	43.6	12.8

Further deliverable dimensions (54)

Show full table · more than 50 rows

Further deliverable dimensions – 54 rows, all dimensions in millimetres.
DN	PN
10	6
15	6
20	6
25	6
32	6
40	6
50	6
65	6
80	6
100	6
125	6
150	6
200	6
250	6
300	6
350	6
400	6
450	6
500	6
600	6
10	10
700	10
800	10
10	16
15	16
20	16
25	16
32	16
40	16
450	16
500	16
15	25
20	25
25	25
32	25
40	25
50	25
65	25
80	25
100	25
125	25
150	25
250	25
300	25
350	25
400	25
450	25
500	25
600	25
10	40
250	40
350	40
400	40
450	40

Order dimensions and values calculated by us; deliverable from stock or procured, availability on request. Limit deviations and figures from the standard: see the main table and the standard itself.

SYSTEM B · TYPE 04 + WELDING NECK COLLAR 34 · DN 10 – DN 600

Loose flange type 04 with welding neck collar 34 (PN 10–40)

Dimensioned pairing drawing of a loose flange type 04 with welding neck collar 34 (parts shown exploded for clarity): A = pipe outside diameter at the weld end, B₃ = bore of the loose flange (with clearance over the hub of the collar), C₁ = flange thickness, F = collar thickness, H₂ = collar height, d₁ = collar outside diameter (also the sealing face), D = outside diameter of the loose flange. The welding neck collar is butt-welded to the pipe; its hub matches the geometry of the welding neck flange. Loose flange and collar are cross-hatched in opposite directions. Accent colour on the pipe outside diameter A. Drawing not to scale.

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

PN 10 – dimension table (DN 100–300)

Loose flange type 04 with collar 34 to EN 1092-1, PN 10 – connection and type dimensions in mm, weights in kg – availability: from stock or procured
DN	Pipe OD (mm)	n × ØL (mm)	M ¹	Ød₁ (mm) ²	ØK (mm)	ØD (mm)	ØB₃ (mm) ³	C₁ (mm) ⁴	F (mm) ⁵	H₂ (mm)	Flange wt. (kg) ⁷	Collar wt. (kg) ⁷
100	114.3	8 × 18	M16	158	180	220	134	22	18	52	3.78	2.12
300	323.9	12 × 22	M20	370	400	445	348	26	22	68	11.1	9.11

PN 16 – dimension table (DN 50–100)

Loose flange type 04 with collar 34 to EN 1092-1, PN 16 – connection and type dimensions in mm, weights in kg – availability: from stock or procured
DN	Pipe OD (mm)	n × ØL (mm)	M ¹	Ød₁ (mm) ²	ØK (mm)	ØD (mm)	ØB₃ (mm) ³	C₁ (mm) ⁴	F (mm) ⁵	H₂ (mm)	Flange wt. (kg) ⁷	Collar wt. (kg) ⁷
50	60.3	4 × 18	M16	102	125	165	77	20	16	45	2.34	0.974
65 ⁸	76.1	8 × 18	M16	122	145	185	96	20	16	45	2.76	1.29
80	88.9	8 × 18	M16	138	160	200	108	20	16	50	3.17	1.67
100	114.3	8 × 18	M16	158	180	220	134	22	18	52	3.78	2.12

PN 25 – dimension table

For PN 25, EN 1092-1 lists a complete range of sizes - our dimension overview does not show their dimensions at present. Tell us the nominal size and we will tell you what we know about it. Some of these sizes are listed below under "Further deliverable dimensions".

PN 40 – dimension table (DN 20–150)

Loose flange type 04 with collar 34 to EN 1092-1, PN 40 – connection and type dimensions in mm, weights in kg – availability: from stock or procured
DN	Pipe OD (mm)	n × ØL (mm)	M ¹	Ød₁ (mm) ²	ØK (mm)	ØD (mm)	ØB₃ (mm) ³	C₁ (mm) ⁴	F (mm) ⁵	H₂ (mm)	Flange wt. (kg) ⁷	Collar wt. (kg) ⁷
20	26.9	4 × 14	M12	58	75	105	42	16	14	40	0.836	0.340
25	33.7	4 × 14	M12	68	85	115	49	16	14	40	0.990	0.444
32	42.4	4 × 18	M16	78	100	140	59	18	14	42	1.65	0.572
40	48.3	4 × 18	M16	88	110	150	67	18	14	45	1.85	0.734
150	168.3	8 × 26	M24	218	250	300	194	30	24	75	8.69	5.25

Further deliverable dimensions (45)

Show full table · more than 40 rows

Further deliverable dimensions – 45 rows, all dimensions in millimetres.
DN	PN
10	10
15	10
20	10
25	10
32	10
40	10
50	10
65	10
80	10
125	10
150	10
200	10
250	10
10	16
15	16
20	16
25	16
32	16
40	16
125	16
150	16
200	16
250	16
10	25
15	25
20	25
25	25
32	25
40	25
50	25
65	25
80	25
100	25
125	25
150	25
200	25
10	40
15	40
50	40
65	40
80	40
100	40
125	40
200	40
250	40

Order dimensions and values calculated by us; deliverable from stock or procured, availability on request. Limit deviations and figures from the standard: see the main table and the standard itself.

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

Both parts are designated separately – each with type number, sealing face form (for the collar), nominal size, pressure rating and material. A loose flange system DN 100, PN 16 with a galvanised steel flange and a stainless steel collar is therefore designated, for example:

Flange EN 1092-1/02/DN 100/PN 16/S235JR
Collar EN 1092-1/32 B1/DN 100/PN 16/1.4571

Correspondingly for the system with welding neck collar: Flange EN 1092-1/04/DN 100/PN 16/S235JR plus Collar EN 1092-1/34 B1/DN 100/PN 16/1.4571. The sealing face form belongs to the collar – the loose flange has no sealing face.

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

² d₁ = outside diameter of the collar, also the raised-face diameter of the sealing face (the collar forms the sealing face of the system).

³ B₂/B₃ = bore of the loose flange (in the standard: “bore diameter”; B₂ applies to type 02, B₃ to type 04). It is sized so the flange fits with clearance over the pipe and collar (type 02) or over the hub of the welding neck collar (type 04).

⁴ C₁ = flange thickness of the loose flange (without raised face – the sealing face sits on the collar).

⁵ F = collar thickness; it applies equally to the weld-on plate collar 32 and the welding neck collar 34.

⁶ For DN 700 and DN 800, EN 1092-1 does not specify the weld-on plate collar 32 (“–”) – lap joint stub ends (type 33/36) or execution by agreement are common there, available on request.

⁷ Weights are indicative values for steel parts per individual component (flange or collar); minor deviations are possible depending on manufacturer and design.

⁸ 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.

The type 04 system with welding neck collar 34 is not standardised in PN 6. For DN 10 to DN 40 the 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. At PN 40, both systems end at DN 400.

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

DN	PN
10	6
15	6
20	6
25	6
32	6
40	6
50	6
65	6
80	6
100	6
125	6
150	6
200	6
250	6
300	6
350	6
400	6
450	6
500	6
600	6
10	10
700	10
800	10
10	16
15	16
20	16
25	16
32	16
40	16
450	16
500	16
15	25
20	25
25	25
32	25
40	25
50	25
65	25
80	25
100	25
125	25
150	25
250	25
300	25
350	25
400	25
450	25
500	25
600	25
10	40
250	40
350	40
400	40
450	40

DN	PN
10	10
15	10
20	10
25	10
32	10
40	10
50	10
65	10
80	10
125	10
150	10
200	10
250	10
10	16
15	16
20	16
25	16
32	16
40	16
125	16
150	16
200	16
250	16
10	25
15	25
20	25
25	25
32	25
40	25
50	25
65	25
80	25
100	25
125	25
150	25
200	25
10	40
15	40
50	40
65	40
80	40
100	40
125	40
200	40
250	40

DN	PN
10	6
15	6
20	6
25	6
32	6
40	6
50	6
65	6
80	6
100	6
125	6
150	6
200	6
250	6
300	6
350	6
400	6
450	6
500	6
600	6
10	10
700	10
800	10
10	16
15	16
20	16
25	16
32	16
40	16
450	16
500	16
15	25
20	25
25	25
32	25
40	25
50	25
65	25
80	25
100	25
125	25
150	25
250	25
300	25
350	25
400	25
450	25
500	25
600	25
10	40
250	40
350	40
400	40
450	40

DN	PN
10	10
15	10
20	10
25	10
32	10
40	10
50	10
65	10
80	10
125	10
150	10
200	10
250	10
10	16
15	16
20	16
25	16
32	16
40	16
125	16
150	16
200	16
250	16
10	25
15	25
20	25
25	25
32	25
40	25
50	25
65	25
80	25
100	25
125	25
150	25
200	25
10	40
15	40
50	40
65	40
80	40
100	40
125	40
200	40
250	40

DN	PN
10	6
15	6
20	6
25	6
32	6
40	6
50	6
65	6
80	6
100	6
125	6
150	6
200	6
250	6
300	6
350	6
400	6
450	6
500	6
600	6
10	10
700	10
800	10
10	16
15	16
20	16
25	16
32	16
40	16
450	16
500	16
15	25
20	25
25	25
32	25
40	25
50	25
65	25
80	25
100	25
125	25
150	25
250	25
300	25
350	25
400	25
450	25
500	25
600	25
10	40
250	40
350	40
400	40
450	40

DN	PN
10	10
15	10
20	10
25	10
32	10
40	10
50	10
65	10
80	10
125	10
150	10
200	10
250	10
10	16
15	16
20	16
25	16
32	16
40	16
125	16
150	16
200	16
250	16
10	25
15	25
20	25
25	25
32	25
40	25
50	25
65	25
80	25
100	25
125	25
150	25
200	25
10	40
15	40
50	40
65	40
80	40
100	40
125	40
200	40
250	40