Ringfeder^® keyless, shaft-hub locking devices

Ringfeder®  Locking AssembliesTM  RfN 7012 & RfN 7012-IN
Ringfeder® Locking AssembliesTM are completely self-contained, frictional shaft-hub locking devices. Designed to generate an easily adjustable and releasable mechanical shrink-fit, they have been used successfully for many years in heavy-duty applications to transmit high torques and dynamic loads and to provide timing and releasability. Locking Assemblies RfN 7012 These are the original Ringfeder® Locking Assemblies featuring doubletapered thrust rings with selfreleasing tapers. They bridge relatively large fit clearances, areeasy to install, adjust or remove, but are not self-centering. A precentering hub section is usually required. These units are most commonly used on applications in general engineering to transmit high torques and axial loads utilizing larger machining tolerances.
Working Principle
Ringfeder® shaft-hub locking devices are based on the inclined plane or taper principle.
Clamping forces generated by torqued up locking screws are translated into predetermined
contact pressures so as to create mechanical shrink-fit connections.

Advantages • Elimination of keys, keyways or splines and associated fitting costs • Completely tight fit around shaft – no backlash • Impervious to reversing, dynamic or shock loads • Transmission of high torques and axial loads Benefits • Reduced machining costs • Easy installation, assembly and disassembly • Easy axial and angular adjustments and timing

Applications Ringfeder® frictional shaft-hub locking devices have successfully solved shaft-hub connection problems involving: Gears Rolls Cams Levers Winches Sprockets Flanges Couplings Brake drums Sheaves Flywheels Hand wheels Clutches Fan wheels Worm gears Bevel gears Helical gears Mixer shafts Crane wheels Bucket wheels Pump impellers Turbine rotors Conveyer pulleys Ship propellers Windmill propellers Rock-cutting heads Shaft-mounted gear units

Picture	Part Number	MA= Kpm/ ft-lbs	Nominal I.D. (in.)	Nominal O.D. (in.)	In Stock Qty
	22 RfN 7012 22 RfN 7012-IN	1,4 / 10.13	0.866	1.850	12
	35 RfN 7012 35 RfN 7012-IN	1,4 / 10.13	1-3/8	2.365	12
	40 RfN 7012 40 RfN 7012-IN	1,4 / 10.13	1-1/2	2.559	41
	65 RfN 7012 65 RfN 7012-IN	3,5 /  -	2-9/16	3.737	7
	70 RfN 7012 70 RfN 7012-IN	7,0 / 50.63	2-3/4	4.337	3
	75 RfN 7012 75 RfN 7012-IN	7,0 / 50.63	2-15/16	4.528	11
	90 RfN 7012 90 RfN 7012-IN	7,0 / 50.63	3-1/2	5.118	13
	100 RfN 7012 100 RfN 7012-IN	12,5 / 90.41	3-15/16	5.708	12