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Flange dimensions, Flange Bolt sizes, Number of flange bolts, Diameter of Flange bolts, Length of Flange bolts        

 

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APP-DATA SHEET

 

 

Flange dimensions are determined by the pipe size and pressure class required for the application.

These dimensions have been standardized and published as ANSI, ASME, API or other standardization organization specifications.

ASME/ANSI B16.5 provides dimensions and tolerances for flanges in pipe sizes from 1/2" through 24" and in classes ranging 150 through 2500.

Nominal Pipe Size
NPS
(inches)
Class 150
Diameter of
Flange
(inches)
No.
of
Bolts
Diameter of
Bolts
(inches)
Bolt
Circle
(inches)
1/43-3/841/22-1/4
1/23-1/241/22-3/8
3/43-7/841/22-3/4
14-1/441/23-1/8
1-1/44-5/841/23-1/2
1-1/2541/23-7/8
2645/84-3/4
2-1/2745/85-1/2
37-1/245/86
3-1/28-1/285/87
4985/87-1/2
51083/48-1/2
61183/49-1/2
813-1/283/411-3/4
1016127/814-1/4
1219127/817
142112118-3/4
1623-1/216121-1/4
1825161-1/822-3/4
2027-1/2201-1/825
2432201-1/429-1/2
Nominal Pipe Size
NPS
(inches)
Class 300
Diameter of
Flange
(inches)
No.
of
Bolts
Diameter of
Bolts
(inches)
Bolt
Circle
(inches)
1/43-3/841/22-1/4
1/23-3/441/22-5/8
3/44-5/845/83-1/4
14-7/845/83-1/2
1-1/45-1/445/83-7/8
1-1/26-1/843/44-1/2
26-1/285/85
2-1/27-1/283/45-7/8
38-1/483/46-5/8
3-1/2983/47-1/4
41083/47-7/8
51183/49-1/4
612-1/2123/410-5/8
815127/813
1017-1/216115-1/4
1220-1/2161-1/817-3/4
1423201-1/820-1/4
1625-1/2201-1/422-1/2
1828241-1/424-3/4
2030-1/2241-1/427
2436241-1/232
Nominal Pipe Size
NPS
(inches)
Class 400
Diameter of
Flange
(inches)
No.
of
Bolts
Diameter of
Bolts
(inches)
Bolt
Circle
(inches)
1/43-3/841/22-1/4
1/23-3/441/22-5/8
3/44-5/845/83-1/4
14-7/845/83-1/2
1-1/45-1/445/83-7/8
1-1/26-1/843/44-1/2
26-1/285/85
2-1/27-1/283/45-7/8
38-1/483/46-5/8
3-1/2987/87-1/4
41087/87-7/8
51187/89-1/4
612-1/2127/810-5/8
81512113
1017-1/2161-1/815-1/4
1220-1/2161-1/417-3/4
1423201-1/420-1/4
1625-1/2201-3/822-1/2
1828241-3/824-3/4
2030-1/2241-1/227
2436241-3/432
Nominal Pipe Size
NPS
(inches)
Class 600
Diameter of
Flange
(inches)
No.
of
Bolts
Diameter of
Bolts
(inches)
Bolt
Circle
(inches)
1/43-3/841/22-1/4
1/23-3/441/22-5/8
3/44-5/845/83-1/4
14-7/845/83-1/2
1-1/45-1/445/83-7/8
1-1/26-1/843/44-1/2
26-1/285/85
2-1/27-1/283/45-7/8
38-1/483/46-5/8
3-1/2987/87-1/4
410-3/487/88-1/2
5138110-1/2
61412111-1/2
816-1/2121-1/813-3/4
1020161-1/417
1222201-1/419-1/4
1423-3/4201-3/820-3/4
1627201-1/223-3/4
1829-1/4201-5/825-3/4
2032241-5/828-1/2
2437241-7/833
Nominal Pipe Size
NPS
(inches)
Class 900
Diameter of
Flange
(inches)
No.
of
Bolts
Diameter of
Bolts
(inches)
Bolt
Circle
(inches)
1/24-3/443/43-1/4
3/45-1/843/43-1/2
15-7/847/84
1-1/46-1/447/84-3/8
1-1/27414-7/8
28-1/287/86-1/2
2-1/29-5/8817-1/2
39-1/287/87-1/2
411-1/281-1/89-1/4
513-3/481-1/411
615121-1/812-1/2
818-1/2121-3/815-1/2
1021-1/2161-3/818-1/2
1224201-3/821
1425-1/4201-1/222
1627-3/4201-5/824-1/2
1831201-7/827
2033-3/420229-1/2
2441202-1/235-1/2
Nominal Pipe Size
NPS
(inches)
Class 1500
Diameter of
Flange
(inches)
No.
of
Bolts
Diameter of
Bolts
(inches)
Bolt
Circle
(inches)
1/24-3/443/43-1/4
3/45-1/843/43-1/2
15-7/847/84
1-1/46-1/447/84-3/8
1-1/27414-7/8
28-1/287/86-1/2
2-1/29-5/8817-1/2
310-1/281-1/88
412-1/481-1/49-1/2
514-3/481-1/211-1/2
615-1/2121-3/812-1/2
819121-5/815-1/2
1023121-7/819
1226-1/216222-1/2
1429-1/2162-1/425
1632-1/2162-1/227-3/4
1836162-3/430-1/2
2038-3/416332-3/4
2446163-1/239
Nominal Pipe Size
NPS
(inches)
Class 2500
Diameter of
Flange
(inches)
No.
of
Bolts
Diameter of
Bolts
(inches)
Bolt
Circle
(inches)
1/25-1/443/43-1/2
3/45-1/243/43-3/4
16-1/447/84-1/4
1-1/47-1/4415-1/8
1-1/2841-1/85-3/4
29-1/4816-3/4
2-1/210-1/281-1/87-3/4
31281-1/49
41481-1/210-3/4
516-1/281-3/412-3/4
6198214-1/2
821-3/412217-1/4
1026-1/2122-1/221-1/4
1230122-3/424-3/8