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Carbon and Stainless Steel Flanges - ASME/ANSI Class 900

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ASME/ANSI B16.5-1996 Pipe Flanges and Flanged Fittings - Class 900 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 900
Pipe Size
(inches)
Flange Outside Diameter
(inches)
Pipe Outside Diameter
(inches)

Number of Bolt HolesBolt Hole Diameter
(inches) 1)
Bolt Circle
(inches)
1/2 4-3/4 0.84 4 7/8 3-1/4
3/4 5-1/8 1.05 4 7/8 3-1/2
1 5-7/8 1.32 4 1 4
1-1/4 6-1/4 1.66 4 1 4-3/8
1-1/2 7 1.90 4 1-1/8 4-7/8
2 8-1/2 2.38 8 1 6-1/2
2-1/2 9-5/8 2.88 8 1-1/8 7-1/2
3 9-1/2 3.50 8 1-1/8 7-1/2
4 11-1/2 4.50 8 1-1/4 9-1/4
5 13-3/4 5.56 8 1-3/8 11
6 15 6.63 12 1-1/4 12-1/2
8 18-1/2 8.63 12 1-1/2 15-1/2
10 21-1/2 10.75 16 1-1/2 18-1/2
12 24 12.75 20 1-1/2 21
14 25-1/4 14.00 20 1-5/8 22
16 27-3/4 16.00 20 1-3/4 24-1/4
18 31 18.00 20 2 27
20 33-3/4 20.00 20 2-1/8 29-1/2
24 41 24.00 20 2-5/8 35-1/2
ANSI B16.5 covers only sizes through 24"
26 42 3/4   20 2 7/8 37 1/2
28 46   20 3 1/8 40 1/4
30 48 1/2   20 3 1/8 42 3/4
32 51 3/4   20 3 3/8 45 1/2
34 55   20 3 5/8 48 1/4
36 57 1/2   20 3 5/8 50 3/4

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

  • 1 inch = 25.4 mm
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