At SDP/SI, QBC, and QTC Metric Gears, we offer a wide range of components and expert services to make your design and product selection process a breeze! Our user-friendly online e-Store is here to simplify everything, with AI-powered search, helpful calculation tools, gear design data, 3D CAD models, and detailed product specs—all designed to help you work smarter and faster.

We know how important quick turnaround times are for your projects, and we’re here to support you every step of the way. With a huge selection of stock components like pulleys, timing belts, gears, bearings, shafting, couplings, speed reducers, fasteners, motors, and gearheads, we make it easy to keep your project moving forward. And if you need extra help, our experienced engineering team is ready to provide guidance, review your design, suggest the right components, and even create custom components or full assemblies tailored to your needs.

Let us help you get the job done!

Standard inch and metric dimensioned components are offered online, many shipping within 24 hours.

Timing Belts and Pulleys

Precision Gears / Commercial Gears

Gearboxes

Molded Components

Coupling

Bearings

Vibration and Shock Absorbing Components

Learn more about our in-house design, engineering, and manufacturing capabilities.

AS9100 and ISO 9001 registered

SDP/SI - Stock Drive Products/Sterling Instrument, a Designatronics company

250 Duffy Avenue, Hicksville, NY 11801

Phone: (516) 328-3300; (800) 819-8900