These tables have been prepared in an effort to familiarize engineers with some of the world standards and American equivalents. In a few cases, dimensions will differ from these tables, particularly in sizes over 48”. It is safest to work from certified prints before fabricating mating rubber or metal flanges. Thicknesses are omitted because of conflicting information in published tables.

American ANSI B.16 Class 125 or 150

Nominal Pipe Size (in)Flanged Outside Dia. (in.)Bolt Circle Dia. (in.)No. of HolesBolt Hole Dia. (in.)Bolt Dia. (in.)
14-1/43-1/845/81/2
1-1/44-5/83-1/245/81/2
1-1/253-7/845/81/2
264-3/443/45/8
2-1/275-1/243/45/8
37-1/2643/45/8
3-1/28-1/2783/45/8
497-1/283/45/8
5108-1/287/83/4
6119-1/287/83/4
813-1/211-3/487/83/4
101614-1/41217/8
1219171217/8
142118-3/4121-1/81
1623-1/221-1/4161-1/81
182522-3/4161-1/41-1/8
2027-1/225201-1/41-1/8
2229-1/227-1/4201-3/81-1/4
243229-1/2201-3/81-1/4
2634-1/431-3/4241-3/81-1/4
2836-1/234281-3/81-1/4
3038-3/436281-3/81-1/4
3241-3/438-3/4281-5/81-1/2
2443-3/440-1/2321-5/81-1/2
364642-3/4321-5/81-1/2
3848-3/445-1/4321-5/81-1/2
4050-3/447-1/4361-5/81-1/2
425349-1/2361-5/81-1/2
4455-1/451-3/4401-5/81-1/2
4657-1/453-3/4401-5/81-1/2
4859-1/256441-5/81-1/2
5061-3/458-1/4441-7/81-3/4
526460-1/2441-7/81-3/4
5466-1/462-3/4441-7/81-3/4
5668-3/465481-7/81-3/4
587167-1/4481-7/81-3/4
607369-1/45221-7/8
6275-1/471-3/45221-7/8
6478745221-7/8
6680765221-7/8
6882-1/478-1/45621-7/8
7084-1/280-1/25621-7/8
7286-1/282-1/26021-7/8
7488-1/284-1/26021-7/8
7690-3/486-1/26021-7/8
789388-3/4602-1/82
8095-1/491602-1/82
8297-1/293-1/4602-1/82
8499-3/495-1/2642-1/82
8610297-3/4642-1/82
88104-1/4100682-1/82
90106-1/2102-1/4682-1/42-1/8
92108-3/4104-1/2682-1/42-1/8
94111106-1/4682-1/42-1/8
96113-1/4108-1/2682-1/22-1/4
98115-1/2110-3/4682-1/22-1/4
100117-3/4113682-1/22-1/4
102120114-1/2722-1/22-1/4
108126-3/4120-3/4722-1/22-1/4
120140-1/4132-3/4762-1/22-1/4
132153-3/4145-3/4802-1/22-1/4
144167-1/4158-1/4842-1/22-1/4

American ANSI B.16 Class 250 or 300

Dimension tables for sizes above 24” are in wide disagreement.
Refer to certified prints applicable to each job.
Nominal Pipe Size (in)Flanged Outside Dia. (in.)Bolt Circle Dia. (in.)No. of HolesBolt Hole Dia. (in.)Bolt Dia. (in.)
1-1/45-1/43-7/843/45/8
1-1/26-1/84-1/247/83/4
26-1/2583/45/8
2-1/27-1/25-7/887/83/4
38-1/46-5/887/83/4
3-1/297-1/487/83/4
4107-7/887/83/4
5119-1/487/83/4
612-1/210-5/8127/87/8
815131217/8
1017-1/215-1/4161-1/81
1220-1/217-3/4161-1/41-1/8
142320-1/4201-1/41-1/8
1625-1/222-3/4201-3/81-1/4
182824-3/4241-3/81-1/4
2020-1/227241-3/81-1/4
223329-1/4241-5/81-1/2
243632241-5/81-1/2
2638-1/434-1/2281-3/41-5/8
2840-3/437281-3/41-5/8
304339-1/4281-7/81-3/4
3245-1/441-1/22821-7/8
3447-1/243-1/22821-7/8
365046322-1/82
3852-1/448322-1/82
4054-1/250-1/4362-1/82
425752-3/5362-1/82
4459-1/455362-1/82
4661-1/257-1/4402-1/82
486560-3/4402-1/82

British Imperial Flanges BS 10

Table D

Nominal Pipe Size (in)Flanged Outside Dia. (in.)Bolt Circle Dia. (in.)No. of HolesBolt Hole Dia. (in.)Bolt Dia. (in.)
1-1/44-3/43-7/1645/81/2
1-1/25-1/43-7/845/81/2
264-1/243/45/8
2-1/26-1/2543/45/8
37-1/45-3/443/45/8
3-1/286-1/243/45/8
48-1/2743/45/8
5108-1/483/45/8
6119-1/483/45/8
71210-1/483/45/8
813-1/411-1/283/45/8
914-1/212-3/483/45/8
10161487/83/4
121816127/83/4
1420-3/418-1/21217/8
1521-3/419-1/21217/8
1622-3/420-1/21217/8
1825-1/4231217/8
2027-3/425-1/41617/8
212926-1/21617/8
2432-1/229-3/4161-1/81

Table E

Nominal Pipe Size (in)Flanged Outside Dia. (in.)Bolt Circle Dia. (in.)No. of HolesBolt Hole Dia. (in.)Bolt Dia. (in.)
1-1/44-3/43-7/1645/81/2
1-1/25-1/43-7/845/81/2
264-1/243/45/8
2-1/26-1/2543/45/8
37-1/45-3/443/45/8
3-1/286-1/283/45/8
48-1/2783/45/8
5108-1/483/45/8
6119-1/487/83/4
71210-1/487/83/4
813-1/411-1/287/83/4
914-1/212-3/4127/83/4
101614127/83/4
1218161217/8
1319-1/417-1/41217/8
1420-3/418-1/21217/8
1521-3/419-1/21217/8
1622-3/420/1/21217/8
172421-3/41217/8
1825-1/4231617/8
1926-1/2241617/8
2027-3/425-1/41617/8
212926-1/2161-1/81
223027-1/2161-1/81
233128-1/2161-1/81
2432-1/229-3/4161-1/41-1/8
2735-3/433-1/4201-1/41-1/8
2938-1/435-1/2201-3/81-1/4
3039-1/436-1/2201-3/81-1/4
334340201-3/81-1/4
354542241-3/81-1/4
3646-1/443241-3/81-1/4
3949-1/246-1/4241-1/21-3/8
4252-1/249-1/4281-1/21-3/8
4555-3/452-1/2281-1/21-3/8
4858-3/455-1/2321-1/21-3/8

Table F

Nominal Pipe Size (in)Flanged Outside Dia. (in.)Bolt Circle Dia. (in.)No. of HolesBolt Hole Dia. (in.)Bolt Dia. (in.)
1-1/45-1/43-7/843/45/8
1-1/25-1/24-1/843/45/8
26-1/2543/45/8
2-1/27-1/45-3/483/45/8
386-1/283/45/8
3-1/28-1/2783/45/8
497-1/283/45/8
5119-1/487/83/4
61210-1/4127/83/4
713-1/411-1/2127/83/4
814-1/212-3/4127/83/4
916141217/8
1017151217/8
1219-1/417-1/41617/8
1320-3/418-1/2161-1/81
1421-3/419-1/2161-1/81
1522-3/420-1/2161-1/81
162421-3/4201-1/81
1725-1/423201-1/81
1826-1/224201-1/41-1/8
1927-3/425-1/4201-1/41-1/8
202926-1/2241-1/41-1/8
213027-1/2241-1/41-1/8
223128-1/2241-3/81-1/4
2332-1/229-3/4241-3/81-1/4
2433-1/230-3/4241-3/81-1/4
2736-3/433-3/4241-3/81-1/4
293936241-3/81-1/4
304037281-3/81-1/4
334340321-3/81-1/4
3545-3/442-1/2321-1/21-3/8
3646-3/443-1/2321-1/21-3/8
3950-1/447361-1/21-3/8
4253-1/450361-1/21-3/8
455753-1/2361-5/81-1/2
4860-1/456-3/4401-5/81-1/2

Metric Flanges SABS 1123, BS 4504, DIN 2501

No data available on SABS sizes above 600mm

DIN or PN 6 (6 Bar)

Nominal Pipe Size (mm)Flanged Outside Dia. (mm)Bolt Circle Dia. (mm)No. of HolesBolt Hole Dia. (mm)Bolt Size (mm)
32140100418M16
40150110418M16
50165125418M16
65185145418M16
80200160818M16
100220180818M16
125250210818M16
150285240822M20
175315270822M20
200340295822M20
2503953501222M20
3004454001222M20
3505054601622M20
4005655151626M24
4506155652026M24
5006706202026M24
6007807252030*M27*
7008958402430M27
80010159502433M30
900111510502833M30
1000123011602836M33
1200145513803239M36
1400167515903642M39
1600191518204048M45
1800211520204448M45
2000232522304848M45
2200255024405256M52
2400276026505656M52
2600296028506056M52
2800318030708456M52
3000340532906862M56

DIN or PN 10 (10 Bar)

* Note SABS 1123 deviations:
600 size 10 bar hole diameter is 26 mm for M24 bolt.
Nominal Pipe Size (mm)Flanged Outside Dia. (mm)Bolt Circle Dia. (mm)No. of HolesBolt Hole Dia. (mm)Bolt Size (mm)
32140100418M16
40150110418M16
50165125418M16
65185145418M16
80200160818M16
100220180818M16
125250210818M16
150285240822M20
175315270822M20
200340295822M20
2503953501222M20
3004454001222M20
3505054601622M20
4005655151626M24
4506155652026M24
5006706202026M24
6007807252030*M27*
7008958402430M27
80010159502433M30
900111510502833M30
1000123011602836M33
1200145513803239M36
1400167515903642M39
1600191518204048M45
1800211520204448M45
2000232522304848M45
2200255024405256M52
2400276026505656M52
2600296028506056M52
2800318030708456M52
3000340532906862M56

DIN or PN 16 (16 Bar)

*Note SABS 1123 deviations:
400 and 450 size 16 bar hole diameter is 26 mm for M24 bolt.
600 size 16 bar hole diameter is 33 mm for M30 bolt.
Nominal Pipe Size (mm)Flanged Outside Dia. (mm)Bolt Circle Dia. (mm)No. of HolesBolt Hole Dia. (mm)Bolt Size (mm)
32140100418M16
40150110418M16
50165125418M16
65185145418M16
80200160818M16
100220180818M16
125250210818M16
150285240822M20
175315270822M20
2003402951222M20
2504053551226M24
3004604101226M24
3505204701626M24
4005805251630*M27*
4506405852030*M27*
5007156502033M30
6008407702036*M33*
7009108402436M33
80010259502439M36
900112510502839M36
1000125511702842M39
1200148513903248M45
1400168515903648M45
1600193018204056M52
1800213020204456M52
2000234522304862M56
2200255524005262M56

DIN or PN 25 (25 Bar)

*Note SABS 1123 deviations:
250 and 300 size 25 bar hole diameter is 26 mm for M24 bolt.
400 and 500 size 25 bar hole diameter is 33 mm for M30 bolt.
Nominal Pipe Size (mm)Flanged Outside Dia. (mm)Bolt Circle Dia. (mm)No. of HolesBolt Hole Dia. (mm)Bolt Size (mm)
32140100418M16
40150110418M16
50165125418M16
65185145818M16
80200160818M16
100235190822M20
125270220826M24
150300250826M24
1753302801226M24
2003603101226M24
2504253701230*M27*
3004854301630*M27*
3505554901633M30
4006205501636*M33*
45006706002036M33
5007306602036*M33*
6008457702039M36
7009608752442M39
80010859902448M45
900118510902848M45
1000132012102856M52
1200153014203256M52
1400175516403662M56
1600197518604062M56
1800219520704470M64
2000242523004870M64

DIN or PN 40 (40 Bar)

Nominal Pipe Size (mm)Flanged Outside Dia. (mm)Bolt Circle Dia. (mm)No. of HolesBolt Hole Dia. (mm)Bolt Size (mm)
32140100418M16
40150110418M16
50165125418M16
65185145818M16
80200160818M16
100235190822M20
125270220826M24
150300250826M24
1752502951230M27
2002753201230M27
2504503851233M30
3005154501633M30
3505805101636M33
4006605851639M36
4506856102039M36
5007556702042M39
6008907952048M45
7009959002448M45
800114010302456M52
900125011402856M52
1000136012502856M52
1200157514603262M56
1400179516803662M56
1600202519004070M64

Japanese and Korean Flanges

JIS-B-2212, JIS-B-2214 & KS-B-1503

JIS 10 & KOREAN 1- Kgf/cm2

Nominal Pipe Size (mm)Flanged Outside Dia. (mm)Bolt Circle Dia. (mm)No. of HolesBolt Hole Dia. (mm)Bolt Size (mm)
109065415M12
159570415M12
2010075415M12
2512590419M16
32135100419M16
40140105419M16
50155120419M16
65175140419M16
80185150819M16
90195160819M16
100210175819M16
125250210823M20
150280240823M20
1753052651223M20
2003302901223M20
2253503101223M20
2504003551225M22
3004454001625M22
3504904451625M22
4005605101627M24
4506205652027M24
5006756202027M24
5507456802033M30
6007957302433M30
6508457802433M30
7009058402433M30
7509709002433M30
80010209502833M30
850107010002833M30
900112010502833M30
1000123511802839M36

JIS 20 & KOREAN 20 Kgf/cm2

Nominal Pipe Size (mm)Flanged Outside Dia. (mm)Bolt Circle Dia. (mm)No. of HolesBolt Hole Dia. (mm)Bolt Size (mm)
109065415M12
159570415M12
2010075415M12
2512590419M16
32135100419M16
40140105419M16
50155120819M16
65175140819M16
80200160823M20
90210170823M20
100225185823M20
125270225825M22
1503052601225M22
2003503051225M22
2504303801227M24
3004804301627M24
3505404801633M30
4006055401633M30
4506756052033M30
5007306602033M30
5507957202039M36
6008457702439M36