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Carbon and Stainless Steel Flanges - ASME/ANSI Class 2500

ASME/ANSI B16.5-1996 Pipe Flanges and Flanged Fittings - Class 2500 Flanges - outside and inside diameters, bolt circles, numbers and diameters of bolts.

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ASME/ANSI B16.5-1996 Pipe Flanges and Flanged Fittings - Class 2500 Flanges - outside and inside diameters, bolt circles, numbers and diameters of bolts for Weld neck, Threaded, Slip-on, Lap joint, Socket weld and Blind flanges.

Carbon and stainless steel qualities according ASME B16.5 Table 1A.

Carbon and Stainless Steel Flanges - ASME/ANSI Class 2500
Pipe Size
(inches)		Flange Outside Diameter
(inches)		Pipe Outside Diameter
(inches)
Number of Bolt HolesBolt Hole Diameter
(inches) 1)		Bolt Circle
(inches)
1/2 5-1/4 0.84 4 7/8 3-1/2
3/4 5-1/2 1.05 4 7/8 3-3/4
1 6-1/4 1.32 4 1 4-1/4
1-1/4 7-1/4 1.66 4 1-1/8 5-1/8
1-1/2 8 1.90 4 1-1/4 5-3/4
2 9-1/4 2.38 8 1-1/8 6-3/4
2-1/2 10-1/2 2.88 8 1-1/4 7-3/4
3 12 3.50 8 1-3/8 9
4 14 4.50 8 1-5/8 10-3/4
5 16-1/2 5.56 8 1-7/8 12-3/4
6 19 6.63 8 2-1/8 14-1/2
8 21-3/4 8.63 12 2-1/8 17-1/4
10 26-1/2 10.75 12 2-5/8 21-1/4
12 30 12.75 12 2-7/8 24-3/8

1) Recommended bolts are 1/8 smaller than the nominal bolt hole diameters shown.

  • 1 inch = 25.4 mm
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