Shaft Couplings feature Fairloc integral fastening system.

Press Release Summary:

Comprised of 45 couplings offered in inch and metric sizes, S51FCZ Series joins shafts from .0900-.2498 in. (2.5-12 mm) dia. Inch to metric or metric to inch couplings are also available. Made of 303 stainless steel, zero backlash couplings are readily adjustable on shaft and feature compact, self-contained Fairloc® hub fastening system, which eliminates marred shafts while adding positive metal-to-metal fastening strength along both hub sections.

Original Press Release:

New Series of 45 Shaft Couplings from Sterling Instrument Feature Fairloc® Integral Fastening System

New Hyde Park, New York - A new series of 45 shaft couplings manufactured by Sterling Instrument in both inch and metric sizes can join shafts of different diameters. This becomes very handy when adding components to existing designs. The couplings 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 along both hub sections. It is compact, self-contained and offers a small coupling hub envelope.

These 303 stainless steel couplings, identified as the S51FCZ Series, feature zero backlash. They are both easy to install and readily adjustable on the shaft. These couplings are designed to fit shafts ranging from .0900" to .2498" (2.5 mm to 12 mm) in diameter. Inch to metric or metric to inch couplings of various diameters available on request.

Each of the two hubs, at either end of the coupling feature 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 $28.23 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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