ANSI FLANGES DIMENSIONS Flanges are commonly used to connect valves into pipework making it easier for removal and maintenance. There are many common flange standards and flanges within the same standard can etiher be flat (commonly cast iron, ductile iron) or raised face (commonly cast steel and stainless steel). Below is a reference table for critical flange dimensions to help identify what standard you have.
15mm (1/2") Standard
Class
Diameter
AS4087 AS 2129
PN14 Table C Table D Table E Table F Table H Table J ANSI 150 ANSI 300 ANSI 600 ANSI 900 ANSI 1500 PN6 PN10 PN16 PN20 PN25 PN40
ANSI B16.5
ISO 7005 (DIN)
20mm (3/4")
95 95 95 95 95 114 114 89 95 95 121 121
Bolt Circle Diameter 67 67 67 67 67 83 83 60 67 67 83 83
Number of Bolts 4 4 4 4 4 4 4 4 4 4 4 4
Bolt Size M12 13 13 13 13 16 16 13 13 13 19 19
Diameter of Bolt Hole 14 14 14 14 14 17 17 16 16 16 22 22
80 95 95 90 95 95
55 65 65 60.5 65 65
4 4 4 4 4 4
M10 M12 M12 M14 M12 M12
11 14 14 16 14 14