SDP/SI Producers Of Off-The-Shelf: Bearings, Gears, Timing Belts, Timing Pulleys, Couplings, Shafts

Stock Drive Products, ISO Certified and Sterling Instrument, ISO Certified+AS9100 Certified are major operating divisions of Designatronics, Inc. SDP/SI's experienced work force designs, manufactures and distributes a diverse line of inch and metric standard and custom commercial and precision-grade components, as well as electromechanical devices and assemblies. Over 100,000 components are available such as: Gears, Timing Belts, Timing Belt Pulleys, Fairloc® Products, Couplings, Conidrive® Self-Guiding Drive System, Gearheads, Right Angle Drives, ShaftLoc® Products, Speed Reducers, TruMotion® Timing Belts, Multipurpose Feed & Idler Rollers, Roller Chains, Brakes, Clutches, Flexible Shafts, Gear Clamps, Sleeves, Shafts & Accessories, Universal Joints, Bearings, Linear Motion Components, Machine Screws, Motors & Gearmotors, Retaining Rings, Pins, Sprockets, Springs & Vibration Mounts

>> Manufacturing Facilities
SDP/SI offers a variety of Design & Manufacturing services including: Gear Cutting, Turning, Milling, and Molding.

Center Distance Designer is an easy tool used to determine the center distance or belt length of a belt drive system. Instead of doing the calculations and looking through tables of information, this tool does it for you in a few simple steps.


Selecting the right coupling for your application is not always an easy task. Many different application considerations and coupling styles have to be evaluated before the right coupling can be selected. We have compiled some useful information to make the selection process easier.

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