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Carbon and Stainless Steel Flanges - ASME/ANSI Class 1500

ASME/ANSI B16.5-1996 Pipe Flanges and Flanged Fittings - Class 1500 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 1500 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 1500
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 10-1/2 3.50 8 1-1/4 8
4 12-1/4 4.50 8 1-3/8 9-1/2
5 14-3/4 5.56 8 1-5/8 11-1/2
6 15-1/2 6.63 12 1-1/2 12-1/2
8 19 8.63 12 1-3/4 15-1/2
10 23 10.75 12 2 19
12 26-1/2 12.75 16 2-1/8 22-1/2
14 29-1/2 14.00 16 2-3/8 25
16 32-1/2 16.00 16 2-5/8 27-3/4
18 36 18.00 16 2-7/8 30-1/2
20 38-3/4 20.00 16 3-1/8 32-3/4
24 46 24.00 16 3-5/8 39

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

  • 1 inch = 25.4 mm
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