The FARR Coupling is utilised whenever a rigid connection is needed involving the reduced velocity shaft of a gearbox as well as the head shaft of the conveyor, bucket elevator, mixer or any over-hung or suspended load. When sized adequately, the FARR Coupling will carry the applica-tion torque, excess weight of gearbox, motor and swing plate. In the case of a mixer, it’ll carry the excess weight of the shaft and impeller, thrust forces and resulting bending moments.
Parts of a FARR Coupling include male and female piloted hubs created from 4140 alloy steel. The hubs are extended to assure 80% hub to shaft get hold of. Keeper plates are included for safety. The two hubs are assembled with Grade 8 bolts and Grade À Prevailing Torque nuts. Common coupling sizes possess a nominal torque vary from 11,300 to 5,736,000 in-lbs. Larger sizes can be found depending on the application.
Attributes
Heat Handled 4140 alloy steel
Male and Female pilots
Enhanced Torque Capacity
Grade 8 Bolts / Grade ?¡ãC?¡À Prevailing Torque Nuts
Extended length through bore
Keeper Plate style and design
FARR Coupling Choice Guidebook
A. Obtain The next Info:
Application
Horsepower & RPM
Gearbox (Reducer) Ratio
Output Velocity
All Shaft Sizes
Overhang Load
Lever Arm
(Distance from end of Gearbox output Shaft to Center-Line of Gearbox or Center Line of Gravity)
B.Calculate Application Torque:
T (in-lb) = ¡ê¡§HP x 63025¡ê?/RPM
C.Calculate Style Torque by applying 2.0 Service Factor to application torque.
D.Select coupling with a torque capability equal to or greater than the Design Torque from the Performance Data table.
E.Verify that the Bore capability of the coupling will meet the application shaft requirements.
F.The Male pilot hub to always be utilized around the Reducer (Gearbox or Driver) shaft along with the Female pilot hub to always be employed over the Head 
(Driven) shaft.
G.Drive System Analysis must be performed by Application Engineering to verify coupling choice.
