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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 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 400
Pipe Size
(inches)
Flange Outside Diameter
(inches)
Pipe Outside Diameter
(inches)

Number of Bolt HolesBolt Hole Diameter
(inches) 1)
Bolt Circle
(inches)
1/2 3-3/4 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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