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# Carbon and Stainless Steel Flanges - ASME/ANSI Class 400

## ASME/ANSI B16.5-1996 Pipe Flanges and Flanged Fittings - Class 400 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 400 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.

Pipe Size
(inches)
Flange Outside Diameter
(inches)
Pipe Outside Diameter
(inches)

Load Calculator!
Number of Bolt HolesBolt Hole Diameter
(inches) 1)
Bolt Circle
(inches)
1/2 3-3/4 0.84 4 5/8 2-5/8
3/4 4-5/8 1.05 4 3/4 3-1/4
1 4-7/8 1.32 4 3/4 3-1/2
1-1/4 5-1/4 1.66 4 3/4 3-7/8
1-1/2 6-1/8 1.90 4 7/8 4-1/2
2 6-1/2 2.38 8 3/4 5
2-1/2 7-1/2 2.88 8 7/8 5-7/8
3 8-1/4 3.50 8 7/8 6-5/8
3-1/2 9 4.00 8 1 7-1/4
4 10 4.50 8 1 8-7/8
5 11 5.56 8 1 9-1/4
6 12-1/2 6.63 12 1 10-5/8
8 15 8.63 12 1-1/8 13
10 17-1/2 10.75 16 1-1/4 15-1/4
12 20-1/2 12.75 16 1-3/8 17-3/4
14 23 14.00 20 1-3/8 20-1/4
16 25-1/2 16.00 20 1-1/2 22-1/2
18 28 18.00 24 1-1/2 24-3/4
20 30-1/2 20.00 24 1-5/8 27
24 36 24.00 24 1-7/8 32

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

• 1 inch = 25.4 mm

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## Related Topics

• Piping Systems - Dimensions of pipes and tubes, materials and capacities, pressure drop calculations and charts, insulation and heat loss diagrams.

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