Flange Bolt Requirements

Flange Size Bolt Hole qty Bolt Diameter Bolt Length Min Butterfly Length Min
1/2" 4 1/2 2  
3/4" 4 1/2 2  
1" 4 1/2 2-1/4  
1-1/4" 4 1/2 2-1/4  
1-1/2" 4 1/2 2-1/2  
2" 4 5/8 3  
2-1/2" 4 5/8 3-1/4 5
3" 4 5/8 3-1/4 5
4" 8 5/8 3-1/2 5-3/4
5" 8 3/4 3-3/4 7
6" 8 3/4 4 7
8" 8 3/4 4-1/2 8
10" 12 7/8 5 9-1/2
12" 12 7/8 5 10
14" 12 1 5  
16" 12 1 5  
18" 16 1-1/8 5  
20" 20 1-1/8 6  
24" 20 1-1/4 6