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Pier Helix Diameter
Helix Diameter vs. Shaft Length
 
The critical factors that dictate the helix size are:
   
  axial load tension load
  torque considerations installation equipment
  soil conditions pipe shaft size
 
The following Table shows the helix configurations that will fit on various pipe shaft sizes. The minimum sizes are the minimum physical sizes that will fit on pipe and the maximum are the maximum practical sizes available.
 
  HELIX DIAMETER (inches)
6 8 10 12 14 16 18 20 22 24 26 28 30 32 34 36 38 40 42 44 46 48
  2-7/8 X X X X X X                                
3-1/2   X X X X X X X                            
4-1/2     X X X X X X X X                        
5-1/2       X X X X X X X X X X                  
6-5/8         X X X X X X X X X X X X            
8-5/8         X X X X X X X X X X X X X X X X    
10-3/4           X X X X X X X X X X X X X X X X X
12-3/4             X X X X X X X X X X X X X X X X
14               X X X X X X X X X X X X X X X
16                   X X X X X X X X X X X X X
20                       X X X X X X X X X X X
24                         X X X X X X X X X X
30                               X X X X X X X
36                                     X X X X
 
 

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