PN Flange Tables

BS4504 PN 16 Flange Dimensions

DN	D	C1	C2	H1	H2	H3	R	A	N1	N2	B1	d1	f1	DN mm	K mm	L mm	No	Size mm
10	90	14	14	20	35	6	3	17,2	28	30	18	40	2	10	60	14	4	M12
15	95	14	14	20	35	6	3	21,3	32	35	22	45	2	15	65	14	4	M12
20	105	14	14	24	38	6	4	26,9	39	45	27,5	58	2	20	75	14	4	M12
25	115	16	16	24	38	6	4	33,7	46	52	34,5	68	2	25	85	14	4	M12
32	140	18	16	26	40	6	5	42,4	56	60	43,5	78	2	32	100	18	4	M16
40	150	18	16	26	42	7	5	48,3	64	70	49,5	88	3	40	110	18	4	M16
50	165	20	18	28	45	8	5	60,3	74	84	61,5	102	3	50	125	18	4	M16
65	185	20	18	32	45	10	6	76,1	92	104	77,5	122	3	65	145	18	8	M16
80	200	20	20	34	50	10	6	88,9	110	118	90,5	138	3	80	160	18	8	M16
100	220	22	20	40	52	12	6	114,3	130	140	116	162	3	100	180	18	8	M16
125	250	22	22	44	55	12	6	139,7	158	168	141,5	188	3	125	210	18	8	M16
150	285	24	22	44	55	12	8	168,3	184	195	170,5	212	3	150	240	22	8	M20
200	340	26	24	44	62	16	8	219,1	234	246	221,5	268	3	200	295	22	12	M20
250	405	29	26	46	70	16	10	273	288	298	276,5	320	3	250	355	26	12	M24
300	460	32	28	46	78	16	10	323,9	342	350	327,5	378	4	300	410	26	12	M24
350	520	35	30	57	82	16	10	355,6	390	400	359	438	4	350	470	26	16	M24
400	580	38	32	63	85	16	10	406,4	444	456	411,0	490	4	400	525	30	16	M27
450	640	42	34	68	87	16	12	457,0	490	502	462,0	550	4	450	585	30	20	M27
500	715	46	34	73	90	16	12	508,0	546	559	513,5	610	4	500	650	33	20	M30
600	840	52	36	83	95	18	12	610,0	650	658	616,5	725	5	600	770	36	20	M33
700	910	60	36	83	100	18	12	711,0	750	760	-	795	5	700	840	36	24	M33
800	1025	68	38	90	105	20	12	813,0	848	864	-	900	5	800	950	39	24	M36
900	1125	76	40	94	110	20	12	914,0	948	968	-	1000	5	900	1050	39	28	M36
1000	1255	84	42	100	120	22	12	1016,0	1056	1072	-	1115	5	1000	1170	42	28	M39
1200	1485	98	48	-	130	30	12	1220,0	1260	-	-	1330	5	1200	1390	48	32	M45
1400	1685	-	52	-	145	30	12	1420,0	1465	-	-	1530	5	1400	1590	48	36	M45
1600	1930	-	58	-	160	35	12	1620,0	1668	-	-	1750	5	1600	1820	56	40	M52
DN	D	C1	C2	H1	H2	H3	R	A	N1	N2	B1	d1	f1	DN mm	K mm	L mm	No	Size mm

Flange Bolting

K = Bolt Circle Diameter, L = Dia Of Bolt Hole, No = Number of Holes , Size = Size of Bolts

What is DN?

DN stands for 'Diameter Nominale'. Put simply, it is a rough translation of mm from imperial sizes, assuming that an inch is 25mm. We refer to a 12" flange as DN300, when in fact it is 304mm.

What is the PCD?

The PCD of a flange is one of the critical dimensions. PCD (Pitch Circle Diameter) is the diameter of a circle that goes through each of the bolt holes.

½"	DN15	6"	DN150
¾"	DN20	8"	DN200
1"	DN25	10"	DN250
1¼"	DN32	12"	DN300
1½"	DN40	14"	DN350
2"	DN50	15"	DN375
2½"	DN65	16"	DN400
3"	DN80	18"	DN450
4"	DN100	20"	DN500
5"	DN125	24"	DN600

There are several standards for flanges, and we deal with four of them;

British Standard - BS10

Table D
Table E
Table F
Table G
Table H
Table J
Table K

Table E is the most popular for applications with water. All dimensions are specified in inches

Australian Standard - AS2129

Table C
Table D
Table E
Table F
Table G
Table H
Table J

These flanges are equivalent to the BS10 flanges, except that all dimensions are specified in mm. In some sizes, bolt holes are slightly larger to give better clearance

American National Standards Institute (ANSI)

ANSI 125
ANSI 150
ANSI 300
ANSI 600
ANSI 900
ANSI 1500

Higher numbers denote higher pressures. Sometimes people use the word 'Class' instead of ANSI. e.g. an ANSI 150 flange might be called a 'Class 150'. All dimensions are specified in inches.

British Standard - BS4504

BS4504-6
BS4504-10
BS4504-16
BS4504-25
BS4504-40
BS4504-64
BS4504-100

PN6
PN10
PN16
PN25
PN40
PN64
PN100

Engineers use the prefix PN (Pressure Nominale). e.g. a BA4504-16 flange will commonly be referred to as a PN16 Generally, a PN16 flange is designed to withstand pressures up to 16 bar. All dimensions are specified in mm.

Technical Links

Atex Guid (TEST)

Trouble Shooting JIS 10K Flanges

IP Ratings Seals

ANSI Flange Tables Viscosity Tables

Formulae