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    Products   Timing Belt Pulleys for Small Power Transmission Applications

Timing Belt Pulleys for Small Power Transmission Applications

Timing Belts

We supply hobbyists, students, distributors and a wide variety of OEMs with high-quality machined timing belt pulleys and molded pulleys at affordable prices.

SDP/SI offers a broad range of off-the-shelf inch and metric timing belt pulleys. Aluminum, steel or plastic pulleys are available with or without metal inserts, metal hubs, set screws or Fairloc® hubs.

As a complete source for small power transmission components, our pulleys are offered in the same profiles as our timing belt selection: 40 D.P., miniature FHT® 1, 2, & 3 mm, Gates PowerGrip GT®2, Gates PowerGrip GT®3, Gates HTD, L, MXL, T, and XL.

For over 50 years we have helped design engineers build synchronous drive systems. Our engineers can assist in the selection of a standard catalog item to meet your need. Sometimes, there are applications where the standard catalog item doesn't meet all requirements. Modifications, custom components or custom drive systems can be designed, engineered, manufactured and assembled in-house.

Design Your Belt and Pulley Drive System

Design your belt drive system using our Center Distance Designer. This calculator computes belt lengths for various center distances and checks the number of teeth in mesh for both pulleys. It calculates pulley drive ratios and the minimal center distance for a designated pulley pair.

The Center Distance Designer shows all available pulleys and belts that fit within your criteria. Click on the part number for instant access to product specifications, 3D CAD Models, pricing and availability. Belts and pulleys ship within 24 hours from stock. If a standard catalog item doesn't meet your needs we can provide custom alternatives, call 516-328-3300 for engineering assistance.






Conidrive® Pulleys Metric

Commercial Conidrive® Pulleys


The self-guiding Conidrive System is made up of pulleys without flanges and belts that are 10, 20 and 30 mm wide. The clear anodized aluminum pulleys are made with the unique Fairloc® hub. If the standard catalog items don't meet your needs other sizes can be made on special order.



Flat Timing Belt Pulleys (Inch / Metric)

Commercial Flat Timing Belt Pulleys


Inch and metric Flat Belt Pulleys are made of fiberglass reinforced polycarbonate with either brass or aluminum inserts and are available off-the-shelf. Pulleys with nonstandard diameters or of special design are available custom-made to your drawings.


Grooved Idler Pulleys (Inch)

Commercial & Precision Grooved Idler Pulleys



Grooved Pulleys (Inch)

Commercial & Precision Grooved Pulleys


Precision and commercial quality Grooved Pulleys are available from stock. Pin or clamp type made in stainless steel or molded with brass insert.


Idler Pulleys with Needle Bearings (Inch)

Commercial Idler Pulleys with Needle Bearings


Steel Idler Pulleys with Needle type Bearings are available for flat belts, v-belts, sprockets and timing pulleys. Standard bore sizes are: 3/16 (inch), 1/4 (inch) and 1/2 (inch).


Metal Timing Belt Pulleys (Inch / Metric)

Commercial & Precision Metal Timing Belt Pulleys


SDP/SI manufactures a wide variety of metal inch and metric sized pulleys. For each profile offered there is a wide selection of available grooves, widths, single-flange, double-flange and no-flange. Other bore sizes, keyways or modifications are available on special order. We stock the timing belts to run with all our pulleys.


Plastic Timing Belt Pulleys (Inch / Metric)

Commercial Plastic Timing Belt Pulleys


Thousands of plastic timing belt pulleys are available off-the-shelf. Molded with and without inserts our pulleys are offered in a wide variety of sizes and standard bore sizes, other bore sizes, keyways or other modifications are available on special request. We stock the timing belts to run with all our pulleys.


Posi-Drive Pulleys (Inch / Metric)

Precision Posi-Drive Sprockets


Posi-Drive Sprockets are designed to run with posi-drive belts. Posi-drive belts are a low-cost alternative to miniature steel chain. The Posi-drive sprockets are made in aluminum or steel and are available with a clamp or pin type hub.


Shaftloc® Pulleys (Inch)

Commercial Shaftloc® Pulleys


Our Shaftloc® Pulleys are molded with a metal insert and are available with single or double flanges. They are available in XL, L, HTD® 3mm, and HTD® 5mm pitches.


Synchromesh Pulleys (Inch / Metric)

Commercial Synchromesh Pulleys


Synchromesh Pulleys are plastic drive pulleys with helical grooves on their outside diameter to enable accurate engagement with the spiral pattern on the drive cable. The pulleys are available in the following pitches: .120, .150, .200 and .250.


Timing Pulley Stock (Inch / Metric)

Commercial Timing Pulley Stock


Available in aluminum or steel, our inch and metric Pulley Stock is offered in a wide variety of number of grooves and groove profiles. See our E-store for availability or call our Sales Group.


V-Belt Pulleys (Inch / Metric)

Commercial V-Belt Pulleys


SDP/SI stocks inch and metric sized Companion Pulleys for 1/4 inch (6 mm) V-belts. Pulleys offered are molded and molded with aluminum insert and range from 1 (inch) thru 6 (inch) (25 mm thru 152 mm) in diameter.