HICKSVILLE, N.Y., July 8, 2025 /PRNewswire/ — Stock Drive Products/Sterling Instrument (SDP/SI), a Designatronics brand and leading U.S. manufacturer of high-quality mechanical components, offers a wide range of timing pulleys featuring multiple hub fastening options, including the exclusive Fairloc® hub design for secure, precise mounting.
Engineered as a fully self-contained system, the Fairloc® hub minimizes shaft misalignment and unwanted movement after installation, making it a preferred solution for applications where reliability and precision are critical. This innovative fastening method is not only reusable and cost-effective, but it also offers significant design flexibility for OEMs and product engineers.
Unlike traditional fastening methods that often require drilling, tapping, or machining keyways and flats, the Fairloc® design allows pulleys to be easily mounted, repositioned, or removed—without shaft damage or loss of torque transmission capability. Integrated directly into the hub, the Fairloc® system is ideal for miniature to medium-sized pulleys (up to 2-inch bore diameter).
Fairloc hub pulleys are available off-the-shelf in both aluminum and polycarbonate, and offered in a variety of belt profiles, including: MXL (A 6D16-… and A 6D16M…), XL (A 6H 3-… and A 6H 3M…), HTD (A 6D23-…, A 6D23M…, A 6H25-… and A 6H25M…), and GT®2 / GT®3 (A 6D51-…, A 6D51M…, A 6D53-…, and A 6D53M…).
“While the purchase price of a pulley with a Fairloc hub is comparable to other solutions, the real value comes in reduced assembly and maintenance costs,” said Simon Brazier, Director of Sales at Designatronics. “There are no keyways or flats to machine, no holes to drill or tap, and no additional components to purchase—making it a cleaner, faster, and more cost-efficient solution.”
To learn more about Fairloc® hub pulleys or explore product specifications, visit SDP/SI online.
About Stock Drive Products/Sterling Instrument (SDP/SI) a Designatronics company
Stock Drive Products/Sterling Instrument (SDP/SI), an ISO 9001:2015 and AS9100D registered company, specializes in engineering, manufacturing, and assembly of mechanical and electromechanical subassemblies. Their capabilities include precision gears, high-quality mechanical components, and custom-engineered solutions. With over 100,000 standard inch and metric components available for quick delivery, SDP/SI supports a wide range of design needs.
About Designatronics
Founded in 1950, parent company Designatronics, Inc. oversees its brands—SDP/SI, QBC (Quality Bearings & Components), QTC Metric Gears and Wybur Tools —to deliver comprehensive mechanical and electromechanical solutions that add value across global markets.
SDP-SI News Release 057, 7.8.2025
250 Duffy Avenue, Hicksville, NY 11801 (516) 328-3300 www.sdp-si.com
View original content to download multimedia:https://www.prnewswire.com/news-releases/sdpsis-exclusive-fairloc-hub-advancing-precision-performance-and-design-flexibility-in-drive-systems-302497164.html
SOURCE SDP/SI
