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Carbon and Stainless Steel Flanges - ASME/ANSI Class 150

ASME/ANSI B16.5-1996 Pipe Flanges and Flanged Fittings - Class 150 Flanges - outside and inside diameters, bolt circles, numbers and diameters of bolts.

ASME/ANSI B16.5-1996 Pipe Flanges and Flanged Fittings - Class 150 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 150
Pipe Size
(inches)
Flange Outside Diameter
(inches)
Pipe Outside Diameter
(inches)
Number of Bolt HolesBolt Hole Diameter
(inches) 1)
Bolt Circle
(inches)
1/2 3-1/2 0.84 4 5/8 2-3/8
3/4 3-7/8 1.05 4 5/8 2-3/4
1 4-1/4 1.32 4 5/8 3-1/8
1-1/4 4-5/8 1.66 4 5/8 3-1/2
1-1/2 5 1.90 4 5/8 3-7/8
2 6 2.38 4 3/4 4-3/4
2-1/2 7 2.88 4 3/4 5-1/2
3 7-1/2 3.50 4 3/4 6
3-1/2 8-1/2 4.00 8 3/4 7
4 9 4.50 8 3/4 7-1/2
5 10 5.56 8 7/8 8-1/2
6 11 6.63 8 7/8 9-1/2
8 13-1/2 8.63 8 7/8 11-3/4
10 16 10.75 12 1 14-1/4
12 19 12.75 12 1 17
14 21 14.00 12 1-1/8 18-3/4
16 23-1/2 16.00 16 1-1/8 21-1/4
18 25 18.00 16 1-1/4 22-3/4
20 27-1/2 20.00 20 1-1/4 25
24 32 24.00 20 1-3/8 29-1/2

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

  • 1 inch = 25.4 mm

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