Shaft Reducers/Extenders have Fairloc hub fastening system.

Press Release Summary:

Comprised of 48 models, S52FCY Series is manufactured in inch and metric sizes to extend shafts to same or different diameters. Hub end of coupling features Fairloc® integral hub fastening system, which eliminates marred shafts. Made of 303 stainless steel, extenders offer zero backlash and are readily adjustable on shaft. They are designed to fit shafts from .120-.500 in. (3-12 mm) dia on female side and .1250-.500 in. (3-12 mm) dia on male side.

Original Press Release:

New Series of 48 Shaft Reducers & Extenders from Sterling Instrument Features Fairloc® Integral Fastening System

New Hyde Park, New York - A new series of 48 shaft reducers and extenders manufactured by Sterling Instrument in both inch and metric sizes can extend shafts to the same or different diameters. This becomes very handy when adding components to existing designs. The extenders feature the patented Fairloc® integral hub fastening system which eliminates marred shafts. The choice of Fairloc® rotating component fastening system helps phase adjustment, timing, position adjustment and frequent removal problems while adding positive metal-to-metal fastening strength. It is compact, self-contained and offers a small coupling hub envelope.

These 303 stainless steel extenders, identified as the S52FCY Series, feature zero backlash. They are both easy to install and readily adjustable on the shaft. These shaft extenders are designed to fit shafts ranging from .120" to .500" (3 mm to 12 mm) in diameter on the female side and .1250" to .500" (3 mm to 12 mm) in diameter on the male side. Inch to metric or metric to inch extensions are also available on request.

The hub end of the coupling features the Fairloc® system. It consists of two slots that are machined into the hub, one orientated radially the other angularly, to create a transverse wedge which remains attached to the solid portion of the hub on one side. The resultant cantilevered clamping section has a tapped hole to accept a cap screw which passes through a clearance hole in the solid portion of the hub, and into a threaded hole in the transverse wedge section. As the screw is tightened, the cantilevered section clamps the shaft securely. The socket head cap screw can be tightened and released repeatedly without marring the shaft or affecting its torque transmitting abilities.

Availability is from stock. Prices start at $27.62 in single unit quantity with substantial quantity discounts offered. Additional specifications are contained in Catalog D790 (Inch) and Catalog D785 (Metric), available free upon request from Sterling Instrument, 2101 Jericho Turnpike, P.O. Box 5416, New Hyde Park, NY 11042-5416. Phone: 516-328-3300 o Fax: 516-326-8827. Web:

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