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 plain 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.

Dimensioned pairing drawing of a loose flange type 02 with plain collar 32 (dimension letters to EN 1092-1, parts shown exploded for clarity): A = pipe outside diameter, B₂ = bore of the loose flange (with clearance over the pipe and collar), C₁ = flange thickness, F = collar thickness, d₁ = collar outside diameter (also the sealing face), D = outside diameter of the loose flange. The collar is fillet-welded to the pipe; the bolt hole is shown in section, n × L is given in the tables. Loose flange and collar are cross-hatched in opposite directions. Accent colour on the pipe outside diameter A. Drawing not to scale.

Connection dimensions are the same across types: outside diameter D, bolt circle 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 plain 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 plain collar 32 (PN 6–40)

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

PN 6 – dimension table (DN 10–600)

Loose flange type 02 with collar 32 to EN 1092-1, PN 6 – connection and type dimensions in mm, weights in kg – availability: available (from stock or on order)
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
10	17.2	4 × 11	M10	35	50	75	21	12	10	0.345	0.056
15	21.3	4 × 11	M10	40	55	80	25	12	10	0.388	0.069
20	26.9	4 × 11	M10	50	65	90	31	14	10	0.568	0.108
25	33.7	4 × 11	M10	60	75	100	38	14	10	0.688	0.149
32	42.4	4 × 14	M12	70	90	120	46	16	10	1.12	0.185
40	48.3	4 × 14	M12	80	100	130	53	16	10	1.29	0.244
50	60.3	4 × 14	M12	90	110	140	65	16	12	1.42	0.319
65	76.1	4 × 14	M12	110	130	160	81	16	12	1.76	0.451
80	88.9	4 × 18	M16	128	150	190	94	18	12	2.84	0.606
100	114.3	4 × 18	M16	148	170	210	120	18	14	3.10	0.729
125	139.7	8 × 18	M16	178	200	240	145	20	14	4.12	1.00
150	168.3	8 × 18	M16	202	225	265	174	20	14	4.53	1.01
200	219.1	8 × 18	M16	258	280	320	226	22	16	6.51	1.73
250	273.0	12 × 18	M16	312	335	375	281	24	18	8.32	2.32
300	323.9	12 × 22	M20	365	395	440	333	24	18	11.1	2.88
350	355.6	12 × 22	M20	415	445	490	365	26	18	15.9	4.77
400	406.4	16 × 22	M20	465	495	540	416	28	20	18.8	5.83
500	508	20 × 22	M20	570	600	645	519	30	22	24.9	8.30
600	610	20 × 26	M24	670	705	755	622	32	22	33.0	9.34

PN 10 – dimension table (DN 10–800)

Loose flange type 02 with collar 32 to EN 1092-1, PN 10 – connection and type dimensions in mm, weights in kg – availability: available (from stock or on order) – 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
10	17.2	4 × 14	M12	40	60	90	21	14	12	0.591	0.094
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	24	12.8	4.02
350	355.6	16 × 22	M20	430	460	505	365	30	26	19.4	7.55
400	406.4	16 × 26	M24	482	515	565	416	32	28	26.4	9.38
500	508	20 × 26	M24	585	620	670	519	38	32	38.5	12.6
600	610	20 × 30	M27	685	725	780	622	42	32	52.2	14.3
700 ⁶	711	24 × 30	M27	800	840	895	721	50	–	79.4	–
800 ⁶	813	24 × 33	M30	905	950	1015	824	56	–	112	–

PN 16 – dimension table (DN 10–800)

Loose flange type 02 with collar 32 to EN 1092-1, PN 16 – connection and type dimensions in mm, weights in kg – availability: available (from stock or on order) – 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
10	17.2	4 × 14	M12	40	60	90	21	14	12	0.591	0.094
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	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
500	508	20 × 33	M30	610	650	715	519	46	32	62.0	21.4
600	610	20 × 36	M33	725	770	840	622	55	32	98.8	28.7
700 ⁶	711	24 × 36	M33	795	840	910	721	63	–	107	–
800 ⁶	813	24 × 39	M36	900	950	1025	824	74	–	152	–

PN 25 – dimension table (DN 10–800)

Loose flange type 02 with collar 32 to EN 1092-1, PN 25 – connection and type dimensions in mm, weights in kg – availability: available (from stock or on order) – 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
10	17.2	4 × 14	M12	40	60	90	21	14	12	0.591	0.094
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 × 26	M24	278	310	360	226	32	26	13.8	4.52
250	273.0	12 × 30	M27	335	370	425	281	35	26	19.4	5.73
300	323.9	16 × 30	M27	395	430	485	333	38	28	25.5	8.42
350	355.6	16 × 33	M30	450	490	555	365	42	32	40.5	14.5
400	406.4	16 × 36	M33	505	550	620	416	48	34	56.1	18.0
500	508	20 × 36	M33	615	660	730	519	58	38	84.6	26.8
600	610	20 × 39	M36	720	770	845	622	68	40	124	34.1
700 ⁶	711	24 × 42	M39	820	875	960	721	85	–	188	–
800 ⁶	813	24 × 48	M45	930	990	1085	824	95	–	259	–

PN 40 – dimension table (DN 10–400)

Loose flange type 02 with collar 32 to EN 1092-1, PN 40 – connection and type dimensions in mm, weights in kg – availability: available (from stock or on order)
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
10	17.2	4 × 14	M12	40	60	90	21	14	12	0.591	0.094
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
250	273.0	12 × 33	M30	345	385	450	281	42	30	28.4	7.87
300	323.9	16 × 33	M30	410	450	515	333	52	34	43.6	12.8
350	355.6	16 × 36	M33	465	510	580	365	58	36	64.9	19.3
400	406.4	16 × 39	M36	535	585	660	416	65	42	95.1	30.4

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 10–600)

Loose flange type 04 with collar 34 to EN 1092-1, PN 10 – connection and type dimensions in mm, weights in kg – availability: available (from stock or on order)
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
10	17.2	4 × 14	M12	40	60	90	31	14	12	35	0.549	0.148
15	21.3	4 × 14	M12	45	65	95	35	14	12	38	0.606	0.189
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
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
125	139.7	8 × 18	M16	188	210	250	162	22	18	55	4.57	2.88
150	168.3	8 × 22	M20	212	240	285	188	24	20	55	6.22	3.46
200	219.1	8 × 22	M20	268	295	340	240	24	20	62	7.90	5.49
250	273.0	12 × 22	M20	320	350	395	294	26	22	68	9.99	7.53
300	323.9	12 × 22	M20	370	400	445	348	26	24	68	11.1	9.11
350	355.6	16 × 22	M20	430	460	505	400	30	26	68	14.7	14.1
400	406.4	16 × 26	M24	482	515	565	450	32	28	72	20.5	17.8
500	508	20 × 26	M24	585	620	670	550	38	32	75	30.7	23.7
600	610	20 × 30	M27	685	725	780	650	42	32	82	43.0	28.9

PN 16 – dimension table (DN 10–600)

Loose flange type 04 with collar 34 to EN 1092-1, PN 16 – connection and type dimensions in mm, weights in kg – availability: available (from stock or on order)
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
10	17.2	4 × 14	M12	40	60	90	31	14	12	35	0.549	0.148
15	21.3	4 × 14	M12	45	65	95	35	14	12	38	0.606	0.189
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
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
125	139.7	8 × 18	M16	188	210	250	162	22	18	55	4.57	2.88
150	168.3	8 × 22	M20	212	240	285	188	24	20	55	6.22	3.46
200	219.1	12 × 22	M20	268	295	340	240	26	20	62	8.37	5.55
250	273.0	12 × 26	M24	320	355	405	294	29	22	70	12.4	7.71
300	323.9	12 × 26	M24	378	410	460	348	32	24	78	16.3	11.4
350	355.6	16 × 26	M24	438	470	520	400	35	26	82	21.5	19.2
400	406.4	16 × 30	M27	490	525	580	454	38	28	85	27.1	23.7
500	508	20 × 33	M30	610	650	715	556	46	32	84	51.1	35.5
600	610	20 × 36	M33	725	770	840	660	55	32	88	78.3	47.9

PN 25 – dimension table (DN 10–600)

Loose flange type 04 with collar 34 to EN 1092-1, PN 25 – connection and type dimensions in mm, weights in kg – availability: available (from stock or on order)
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
10	17.2	4 × 14	M12	40	60	90	31	14	12	35	0.549	0.148
15	21.3	4 × 14	M12	45	65	95	35	14	12	38	0.606	0.189
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
50	60.3	4 × 18	M16	102	125	165	77	20	16	48	2.47	1.02
65	76.1	8 × 18	M16	122	145	185	96	22	16	52	3.04	1.36
80	88.9	8 × 18	M16	138	160	200	108	24	18	58	3.61	1.90
100	114.3	8 × 22	M20	162	190	235	134	26	20	65	5.18	2.77
125	139.7	8 × 26	M24	188	220	270	162	28	22	68	6.89	3.78
150	168.3	8 × 26	M24	218	250	300	188	30	24	75	8.69	5.25
200	219.1	12 × 26	M24	278	310	360	250	32	26	80	11.6	9.07
250	273.0	12 × 30	M27	335	370	425	302	35	26	88	17.0	12.7
300	323.9	16 × 30	M27	395	430	485	356	38	28	92	22.0	18.0
350	355.6	16 × 33	M30	450	490	555	408	42	32	100	32.1	27.8
400	406.4	16 × 36	M33	505	550	620	462	48	34	110	44.5	36.3
500	508	20 × 36	M33	615	660	730	568	58	38	125	65.9	55.7
600	610	20 × 39	M36	720	770	845	670	68	40	125	98.4	70.5

PN 40 – dimension table (DN 10–400)

Loose flange type 04 with collar 34 to EN 1092-1, PN 40 – connection and type dimensions in mm, weights in kg – availability: available (from stock or on order)
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
10	17.2	4 × 14	M12	40	60	90	31	14	12	35	0.549	0.148
15	21.3	4 × 14	M12	45	65	95	35	14	12	38	0.606	0.189
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
50	60.3	4 × 18	M16	102	125	165	77	20	16	48	2.47	1.02
65	76.1	8 × 18	M16	122	145	185	96	22	16	52	3.04	1.36
80	88.9	8 × 18	M16	138	160	200	108	24	18	58	3.61	1.90
100	114.3	8 × 22	M20	162	190	235	134	26	20	65	5.18	2.77
125	139.7	8 × 26	M24	188	220	270	162	28	22	68	6.89	3.78
150	168.3	8 × 26	M24	218	250	300	188	30	24	75	8.69	5.25
200	219.1	12 × 30	M27	285	320	375	250	36	28	88	14.9	10.2
250	273.0	12 × 33	M30	345	385	450	312	42	30	105	23.8	16.4
300	323.9	16 × 33	M30	410	450	515	368	52	34	115	36.0	25.4
350	355.6	16 × 36	M33	465	510	580	418	58	36	125	50.4	37.8
400	406.4	16 × 39	M36	535	585	660	472	65	42	135	75.5	56.4

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 plain collar 32 and the welding neck collar 34.

⁶ For DN 700 and DN 800, EN 1092-1 does not specify the plain 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.

Order loose flanges and collars

Already know DN, PN and material? Zickwolff supplies loose flanges, plain collars and welding neck collars to EN 1092-1 in carbon and stainless steel, from Germany, across Europe.

Send us your inquiry

← Back to the English flange guide

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. Editorially reviewed: August 2026. Standards and manufacturer status considered: August 2026.