Standard F Style
Double engagement (F flex-flex) for parallel and angular misalignment
Single engagement (FFR flex-rigid) accommodates angular misalignment only and it is ideal for floating shaft applications
Field typical flange bolt patterns
FHD Type regular for sizes ten as a result of thirty (other sizes obtainable on request)
Rigid-Rigid FRR Sort
Created for connecting two rigidly mounted shafts without any misalignment capability
Alloy Rigid-Rigid FARR Variety
Longer piloted hubs sustain rigidity and concentricity
Applied 
for cantilevered loads for instance gear boxes that hang off conveyor systems
Alloy steel out there for greater strength (FARR)
Mill Motor FMM Style
First hub created with longer universal hub on one particular end to accommodate straight or tapered shafts
Second hub bored to client specs
Regular style and design accommodates AISE Mill Motor frame sizes
Sleeves and 2nd hub are regular