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Reference Table Details

Bolting Dimensions for 400 lb. Flanges

Nom Pipe Size Diam of Bolt Circle Diam of Bolts Nbr. of Bolts Length of Studs 1/4" Raised Face
0.50 2.625 0.500 4 3.000
0.75 3.250 0.625 4 3.250
1.00 3.500 0.625 4 3.500
1.25 3.875 0.625 4 3.750
1.50 4.500 0.750 4 4.000
2.00 5.000 0.625 8 4.000
2.50 5.875 0.750 8 4.500
3.00 6.625 0.750 8 4.750
3.50 7.250 0.875 8 5.250
4.00 7.875 0.875 8 5.250
5.00 9.250 0.875 8 6.500
6.00 10.625 0.875 12 5.750
8.00 13.000 1.000 12 6.500
10.00 15.250 1.125 16 7.250
12.00 17.750 1.250 16 7.750
14.00 20.250 1.250 20 8.000
16.00 22.500 1.375 20 8.500
18.00 24.750 1.375 24 8.750
20.00 27.000 1.500 24 9.500
22.00 29.250 1.625 24 10.000
24.00 32.000 1.750 24 10.500
26.00 34.500 1.750 28 11.500
30.00 39.250 2.000 28 13.000
34.00 43.500 2.000 28 13.750
36.00 46.000 2.000 32 14.000
42.00 52.750 2.500 32 16.250
Stud lengths for lap joint flanges are equal to lengths shown minus 0.5"plus the thickness of two laps of the stub ends.

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