US Manufacturer of Power Transmission and Motion Control Products since 1950

Stock Belt and Pulley Drive Components, from concept to high-volume production.

SDP/SI stock HTD® timing belt pulleys are available in aluminum, nylon, and polycarbonate constructions, with optional metal hubs or inserts. Standard offerings include 3 mm, 5 mm, and 8 mm pitches, with tooth counts ranging from 10 to 80.

In addition, SDP/SI offers HTD® pulley stock manufactured from aluminum or carbon steel, with tooth counts from 9 to 160, available for online purchase. These include Series A 6A22M…, A 6C22M…, A 6A24M…, and A 6C24M….

HTD® pulley series A 6D23… and A 6H25… incorporate the proprietary SDP/SI Fairloc® hub design. These pulleys provide a compact, reliable solution for applications that require precise phasing, accurate timing, and frequent component adjustment or removal.

The Fairloc® fastening system ensures secure, metal-to-metal shaft engagement across the full hub width, reducing wobble and misalignment while maintaining a minimal hub profile. Its self-contained design allows repeated tightening and loosening without shaft damage or loss of torque transmission.

Explore HTD® Timing Belts – timing belt stock can be cut to customized widths, Call us!

Engineering Support and Online Design Resources

Whether supporting new product development or optimizing an existing assembly, SDP/SI provides the engineering and manufacturing expertise required for scalable, long-term production success.

Engineers and OEMs can access a comprehensive online catalog of inch and metric mechanical components, including:

• Product specifications
• 3D CAD model downloads
• Online quotation requests
• Ordering and procurement tools

SDP/SI standard timing pulleys and mechanical components are available online to help streamline design, sourcing, and production workflows. SDP/SI E-Store

Whether you need a synchronous belt and pulley drive solution or a fully customized mechanical or electromechanical assembly, SDP/SI’s engineering team is ready to help. Requests for quote are accepted from drawings or 3D CAD models.

Partner with SDP/SI—where precision, performance, and engineering expertise come together.

SDP/SI - Stock Drive Products/Sterling Instrument, a Designatronics company
250 Duffy Avenue, Hicksville, NY 11801
Phone: (516) 328-3300; (800) 819-8900
https://shop.sdp-si.com