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Reference Table Details

Bolting Dimensions for 150 lb. Flanges

Nom Pipe Size Diam of Bolt Circle Diam of Bolts Nbr. of Bolts Length of Studs 1/16" Raised Face Bolt Length
0.50 2.375 0.500 4 2.250 1.750
0.75 2.750 0.500 4 2.250 2.000
1.00 3.125 0.500 4 2.500 2.000
1.25 3.500 0.500 4 2.500 2.250
1.50 3.875 0.500 4 2.750 2.250
2.00 4.750 0.625 4 3.000 2.750
2.50 5.500 0.625 4 3.250 3.000
3.00 6.000 0.625 4 3.500 3.000
3.50 7.000 0.625 8 3.500 3.000
4.00 7.500 0.625 8 3.500 3.000
5.00 8.500 0.750 8 3.750 3.250
6.00 9.500 0.750 8 3.750 3.250
8.00 11.750 0.750 8 4.000 3.500
10.00 14.250 0.875 12 4.500 3.750
12.00 17.000 0.875 12 4.500 4.000
14.00 18.750 1.000 12 5.000 4.250
16.00 21.250 1.000 16 5.250 4.500
18.00 22.750 1.125 16 5.750 4.750
20.00 25.000 1.125 20 6.000 5.250
22.00 27.250 1.250 20 6.500 5.500
24.00 29.500 1.250 20 6.750 5.750
26.00 31.750 1.250 24 7.000 6.000
30.00 36.000 1.250 28 7.250 6.250
34.00 40.500 1.500 32 8.000 7.000
36.00 42.750 1.500 32 8.250 7.000
42.00 49.500 1.500 36 8.750 7.500
Stud lengths for lap joint flanges are equal to lengths shown plus the thickness of two laps of the stub ends.
Bolting arrangements for 125 lb. cast iron flanges are the same as shown for 150 lb. steel flanges.

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