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# Cast Iron Flanges - ASME/ANSI Class 250

## ASME/ANSI B16.1 Cast Iron Pipe Flanges and Flanged Fittings - Class 250 Flanges - outside and inside diameters, bolt circles, numbers and diameters of bolts.

ASME/ANSI B16.1 - 1998 - Cast Iron Pipe Flanges and Flanged Fittings - Class 250 Flanges - outside and inside diameters, bolt circles, numbers and diameters of bolts:

Cast Iron Flanges - ASME/ANSI 250 lb
Pipe Size
(inches)
Outside Diameter
(inches)
Number of Bolt HolesBolt Hole Diameter
(inches)
Bolt Circle
(inches)
1 4-7/8 4 3/4 3-1/2
1-1/4 5-1/4 4 3/4 3-7/8
1-1/2 6-1/8 4 7/8 4-1/2
2 6-1/2 8 3/4 5
2-1/2 7-1/2 8 7/8 5-7/8
3 8-1/4 8 7/8 6-5/8
3-1/2 9 8 7/8 7-1/4
4 10 8 7/8 7-7/8
5 11 8 7/8 9-1/4
6 12-1/2 12 7/8 10-5/8
8 15 12 1 13
10 17-1/2 16 1-1/8 15-1/4
12 20-1/2 16 1-1/4 17-3/4
14 23 20 1-1/4 20-1/4
16 25-1/2 20 1-3/8 22-1/2
18 28 24 1-3/8 24-3/4
20 30-1/2 24 1-3/8 27
24 36 24 1-5/8 32
30 43 28 2 39-1/4
36 50 32 2-1/4 46
42 57 36 2-1/4 52-3/4
48 65 40 2-1/4 60-3/4
• 1 inch = 25.4 mm

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## Related Documents

• ### ANSI - American National Standards Institute

ANSI provides a forum for development of American national standards.
• ### ASME - American Society of Mechanical Engineers

ASME is one of the leading organizations in the world developing codes and standards.
• ### ASME/ANSI B16 Standards for Pipes and Fittings

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

The four basic types of cast iron - white iron, gray iron, ductile iron and malleable iron.
• ### Cast Iron Flanged Pipe Fittings - Working Pressures vs. Temperature

Maximum working pressures for cast iron flanged pipe fittings according ANSI B16.1.
• ### Cast Iron Flanges - ASME/ANSI Class 125

ASME/ANSI B16.1 Cast Iron Pipe Flanges and Flanged Fittings - Class 125 Flanges - outside and inside diameters, bolt circles, numbers and diameters of bolts.
• ### Cast Iron Flanges - ASME/ANSI Class 25

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 - Stud Reference Chart

The number, diameter and length of studs for cast iron flanges class 125 and 250.
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Maximum working pressures for cast iron threaded pipe fittings according ANSI B16.4.

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