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Cast Iron Flanges - ASME/ANSI Class 25

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ASME/ANSI B16.1 - 1998 - Cast Iron Pipe Flanges and Flanged Fittings - Class 25 Flanges - outside and inside diameters, bolt circles, numbers and diameters of bolts.

Cast Iron Flanges - ASME/ANSI 25 lb
Pipe Size
(inches)		Outside Diameter
(inches)		Number of Bolt HolesBolt Hole Diameter
(inches)		Bolt Circle
(inches)
4 9 8 3/4 7-1/2
5 10 8 3/4 8-1/2
6 11 8 3/4 9-1/2
8 13-1/2 8 3/4 11-3/4
10 16 12 3/4 14-1/4
12 19 12 3/4 17
14 21 12 7/8 18-3/4
16 23-1/2 16 7/8 21-1/4
18 25 16 7/8 22-3/4
20 27-1/2 20 7/8 25
24 32 20 7/8 29-1/2
30 38-3/4 28 1 36
36 46 32 1 42-3/4
42 53 36 1-1/8 49-1/2
48 59-1/2 44 1-1/8 56
54 66-1/4 44 1-1/8 62-3/4
60 73 52 1-1/4 69-1/4
72 86-1/2 60 1-1/4 82-1/2
84 99-3/4 64 1-3/8 95-1/2
96 113-1/4 68 1-3/8 108-1/2
  • 1 inch = 25.4 mm
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ANSI provides a forum for development of American national standards.

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The ASME B16 standards covers pipes and fittings in cast iron , cast bronze, wrought copper and steel.

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Cast Iron Flanges - ASME/ANSI Class 125

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Cast Iron Flanges - ASME/ANSI Class 250

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The number, diameter and length of studs for cast iron flanges class 125 and 250.

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