Buying Guide

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Revised 7/20/2018
Flange Dimensions
Class 125 Cast Iron Flanges - ASME/ANSI Standard B16.1
Mates with 150-Ib. Steel Flanges ASME Standard B16.5
Dimension in Inches
Diameter Thickness Diameter Bolt Number Diameter *Length
of of of Bolt Hole of of of
Size Flange Flange Circle Diameter Bolts Bolts Bolts
2 6.00 .63 4.75 .75 4 .63 2.25
2¹⁄₂ 7.00 .69 5.50 .75 4 .63 2.50
3 7.50 .75 6.00 .75 4 .63 2.50
3¹⁄₂ 8.50 .81 7.00 .75 8 .63 2.75
4 9.00 .94 7.50 .75 8 .63 3.00
5 10.00 .94 8.50 .88 8 .75 3.00
6 11.00 1.00 9.50 .88 8 .75 3.25
8 13.50 1.13 11.75 .88 8 .75 3.50
10 16.00 1.19 14.25 1.00 12 .88 3.75
12 19.00 1.25 17.00 1.00 12 .88 3.75
14 21.00 1.38 18.75 1.13 12 1.00 4.25
16 23.50 1.44 21.25 1.13 16 1.00 4.50
18 25.00 1.56 22.75 1.25 16 1.13 4.75
20 27.50 1.69 25.00 1.25 20 1.13 5.00
24 32.00 1.88 29.50 1.38 20 1.25 5.50
*When bolting to steel flanges, longer bolts or stud may be required.
Class 250 Cast Iron Flanges - ASME/ANSI Standard B16.1
Mates with 300 Ib. Steel Flanges ASME Standard B16.5
Dimension in Inches
Diameter Thickness Diameter Bolt Number Diameter *Length
of of of Bolt Hole of of of
Size Flange Flange Circle Diameter Bolts Bolts Bolts
2 6.50 .88 5.00 .75 8 .63 2.75
2¹⁄₂ 7.50 1.00 5.88 .88 8 .75 3.25
3 8.25 1.13 6.63 .88 8 .75 3.50
3¹⁄₂ 9.00 1.19 7.25 .88 8 .75 3.50
4 10.00 1.25 7.88 .88 8 .75 3.75
5 11.00 1.38 9.25 .88 8 .75 4.00
6 12.50 1.44 10.63 .88 12 .75 4.00
8 15.00 1.63 13.00 1.00 12 .88 4.50
10 17.50 1.88 15.25 1.13 16 1.00 5.25
12 20.50 2.00 17.75 1.25 16 1.13 5.50
14 23.00 2.13 20.25 1.25 20 1.13 6.00
16 25.50 2.25 22.50 1.38 20 1.25 6.25
18 28.00 2.38 24.75 1.38 24 1.25 6.50
20 30.50 2.50 27.00 1.38 24 1.25 6.75
24 36.00 2.75 32.00 1.63 24 1.50 7.50
*When bolting to steel flanges, longer bolts or stud may be required