Mounting Configurations
In order to transfer torque from the mix shaft to the blade, manufacturers use a number of configurations:
CENTER BORE ONLY
A round hole is made in the center of the blade. The blade is sandwiched between an upper and lower surface (this could be a shoulder on the shaft and the retaining bolt or a pair of washers or taper plates). As the bolt is tightened it applies pressure to the blade. It is this pressure that transfers torque to the blade. This design is used on none but the smallest blades, 4" and below. Typically found on aftermarket lab shafts and lab equipment.
- At DisperseTech we use this design for our light-weight lab shafts with blades up to 3" in diameter.
- DisperseTech LLC
- Morehouse Cowles
- Myers Engineering
- Shar Systems

CENTER BORE and PIN HOLES
- Bowers Process Equipment
- Jaygo Incorporated
- Morehouse Cowles
- Myers Engineering
- Schold Machine Corporation
- Shar Systems

CENTER BORE and KEYWAY
COMBINATION KEYWAY and PIN HOLES
Unique to Hockmeyer, this design is typically used with machines over 60 HP and blades over 18" diameter, the bore and keyway is supplemented by the addition of 2 or more pin holes.
- Hockmeyer Equipment Corp.
Mounting Arrangements by Manufacturer

Bowers Process Equipment
- 1-1/2" Center Hole and three (3) 3/8" pin holes on a 2-1/4" bolt circle
- 2-13/16" Center Hole and three (3) 17/32" pin holes on a 4" bolt circle

Cowles / Morehouse Cowles
- 5/8" center hole ONLY
- 5/8" center Hole and two (2) 3/8" pinholes on a 2-1/4" bolt circle
- 5/8" center Hole and four (4) 3/8" pinholes on a 2-1/4" bolt circle
- 3-9/16" center Hole and four (4) 21/32" pinholes on a 4-1/16" bolt circle

Hockmeyer Equipment Corp.
- Lab to 3 HP - 1/2 bore with Keyway
- 5hp to 7.5 hp - 3/4" bore with keyway
- 10 to 30 hp - 1-3/8" bore 40 to
- 60 hp - 2-3/16" Bore
- 100 hp - 2-3/4" Bore *NOTE -
- Large HP 2-3/4" Bore may also have (2) 1/2" Pinholes on 8" bolt circle

Jaygo Incorporated
- 5/8" center Hole and two (2) 9/16" pinholes on a 4" bolt circle

Myers Mixers
- 5/8" Center Hole and two (2) 7/16" pin holes on a 2-3/4" bolt circle
- 5/8" Center Hole and two (2) 7/16" pin holes on a 3-1/4" bolt circle
- 5/8" Center Hole and four (4) 7/16" pin holes on a 5" bolt circle
- 3" Center Hole and four (4) 9/16" pin holes on a 5" bolt circle
- 3-1/2" Center Hole and four (4) 9/16" pin holes on a 5" bolt circle

Schold Machine Company
- 5/8" Center Hole and two (2) 1/2" pin holes on a 2-1/4" bolt circle
- 1" Center Hole and two (2) 1/2" pin holes on a 6" bolt circle

Shar Systems Inc.
- 3/4" Center Hole and two (2) 5/16" pin holes on a 2-1/2" bolt circle
- 1-3/4" Center Hole and two (2) 5/16" pin holes on a 2-1/2" bolt circle
- 3/4" Center Hole and two (2) 3/4" pin holes on a 3-1/2" bolt circle
CLEAR DIAMETER: The clear diameter defines a circle at the center of the blade free from obstruction. It defines the largest reinforcing disk and/or mounting hub that a blade can accommodate. This is more a property of the blade style rather than the disperser. It is most important for blade styles with louvers, rings, and inset teeth, including:
- Constant Shear Impellers
- CONN Blades
- D Blades
- Myers Style Blades
Visit our blade shop to view various replacement configurations.