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    Products  Timing Belts, Timing Pulleys, Sprockets, and Chains for Power Transmission Applications

Timing Belts, Timing Pulleys, Sprockets, and Chains for Power Transmission Applications

Commercial and Precision Timing Belt Profiles

Including all timing belt profiles:
40 DP, FHT, GT, HTD L, MXL,
Posi-Drive Synchromesh, T, XL

Metal Timing Belt Pulleys (Inch / Metric)

Inch and Metric Plastic or Metal Timing Belt Pulley

SDP/SI manufactures a wide variety of metal and plastic inch and metric sized pulleys. Molded pulleys are offererd with and without inserts. 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.

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.

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.

Commercial Cable & Fittings

Commercial Cables & Fittings


Miniature Cable is sold in multiples of 10 feet in .024 (inch) thru 1/8 (inch) O.D. Stainless Steel cable is nylon coated, protecting wire and pulleys from abrasion and sealing in lubrication. Threaded plugs, ball end plugs, loop sleeves and thimbles are also offered for use with the miniature cable.

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.

Commercial Clamps

Commercial Clamps


A wide selection of Timing Belt Clamps for use in linear drive systems is offered. Clamps are available in plastic and aluminum for single- and double-sided timing belts.

Commercial Coinidrive® Belts (Metric)

Commercial Coinidrive® Belts


A wide selection of Timing Belt Clamps for use in linear drive systems is offered. Clamps are available in plastic and aluminum for single- and double-sided timing belts.

Commercial Coinidrive® Open Ended Belts (Metric)

Commercial Coinidrive® Open Ended Belts - Metric


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.

Commercial Coinidrive® Mounting Plate (Metric)

Commercial Coinidrive® Mounting Plate


Commercial Flat Belts

Commercial Flat Belts


1/4 inch (6 mm) wide Flat Belts are designed for high-speed applications. Made of polyester woven cord with black neoprene coating, these belts are capable of reaching maximum speed of 20,000 fpm (6,100 meters/min.). Non-standard widths can be cut to size from sleeves available from stock.

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.

Commercial O-rings (Metric)

Commercial O-Rings


Neoprene Round Endless Belts or O-Rings are offered in a variety of diameters and internal diameters for use in mechanical belt drives. These belts can be used with companion pulleys and grooved pulleys – see our online store inch and metric

Commercial Round Endless Belts - (Inch / Metric)

Commercial Round Endless Belts


Commercial Rounthane Belts - (Inch)

Commercial Rounthane Belts - Inch


Non-slip polyurethane belting is available in 3 diameters: 3/16, 1/4 and 5/16 (inch). These belts can be used with companion pulleys and grooved idlers, having diameters at least 8 times belt diameters. Belting can be installed as an open or closed drive system.

Commercial Rounthane Belt Connectors - (Inch)

Commercial Rounthane Belt Connector - Inch


Aluminum connectors are sold for use with our non-slip polyurethane belting.

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.

Commercial V-belts - Fractional H.p (Inch / Metric)

Commercial V-belts - Fractional H.p - Inch


SDP/SI offers a series of inch and metric sized V-belts. Made of reinforced rubber, these belts are oil and heat resistant and are static dissipating. Companion pulleys are also offered.

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.

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).

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.


More Information on Synchromesh

Commercial Synchromesh Attachments

Commercial Synchromesh Attachments


A variety of attachments are offered for use with the synchromesh cable such as loop sleeves, plugs, eyes, for convenient screw mounting and thimbles. Stainless Steel thimbles provide loop support at higher loads & protect cables from wear when motion is present.

More information on Synchromesh

Commercial Tension Tester - Pencil Type (Inch)

Commercial Tension Tester, Pencil Type - Inch


Easy-to-use, lightweight Pencil Type Tension Gauge measures maximum deflection force of 30 lbs.

Commercial Tension Tester - Sonic Type (Inch)

Tension Tester, Sonic Type - Inch


The Sonic Tension Meter works on the theory that belts, like strings, vibrate at a particular natural frequency based on mass and span length. The meter converts this frequency into a measurement of tension. The meter provides fast, accurate tension readings and is suitable for checking multi-ribbed belts, V-belts, and synchronous belts.

Commercial Chain Tensioners

Commercial Chain Tensioners


A variety of chain tensioners are offered by SDP/SI. Maintaining proper chain tension protects equipment and results in long and trouble-free operation of drive systems.

Commercial Ladder Chains

Commercial Ladder Chains


We offer a large selection of ladder chain in various materials, pitches and lengths. Plastic sprockets and metal sprockets are also available.

Commercial Ladder Chain Sprockets

Commercial Ladder Chain Sprockets


SDP/SI offers plastic, steel, Stainless Steel and brass ladder chain sprockets. Sprockets and ladder chain are available off-the-shelf in a wide variety of pitches, bore sizes and number of teeth.

Commercial Roller Chains

Commercial Roller Chains


Molded subminiature roller chain, miniature roller chain, plastic roller chain, stainless steel and hardened steel roller chain are offered here. Find the roller chain and roller chain sprocket for your power transmission system.

Commercial Roller Chain Sprockets

Commercial Roller Chain Sprockets


Inch and metric sized sprockets designed to operate with roller chain are available as standard catalog items. A broad selection of materials, sizes, number of teeth and pitches are offered. Bore sizes start as small as 3/32 (inch). Plastic and metal roller chains are also available. Can't find a standard to meet your needs – our engineering staff can offer alternative solutions from simple modifications to custom design, engineering and manufacturing.



Synchronous drives employ the positive engagement of two sets of meshing teeth. Due to this design, they do not slip and there is no relative motion between the two elements in mesh. The positive nature of these drives makes them capable of transmitting large torques and withstand large accelerations. However, chain drives are often used where positive synchronization between shafts and transmission of substantial torque is required. 

SDP/SI supplies hobbyists, students, distributors and a wide variety of OEMs with high-quality machined timing belt pulleys, molded pulleys, timing belts, sprockets, and chains at affordable prices.

Synchronous drives can be divided into 3 categories:
  • Chains and Sprockets
  • Gears
  • Belt Drives

Belt drives are particularly useful in applications where layout flexibility is important. They enable the designer to place components in more advantageous locations at larger distances without paying a price penalty.

SDP/SI offers a broad range of off-the-shelf inch and metric timing belts, timing belt pulleys, chains, and sprockets; timing pulleys in aluminum, steel or plastic with or without metal inserts, metal hubs, set screws or Fairloc® hubs.

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.

SDP/SI carries a large inventory of single and double-sided timing belts in standard inch and metric widths. Belt stock in fiberglass reinforced neoprene and polyurethane reinforced with steel tensile cords are also available. If your requirement is a non-standard width, on-hand timing belt sleeves can be cut to your exact need, often overnight for fast turn-around.

Get the timing belt you need!
  • 40 D.P.
  • Miniature FHT® 1, 2, & 3 mm
  • Gates PowerGrip GT®2
    Gates PowerGrip® GT®3
    Gates HTD
  • L
  • MXL
  • T
  • XL

Other drive components offered are: PosiDrive, Synchromesh, round belts, flat belts, fractional H.P. V-belts and belt clamps.

Also available from Gates is their PowerGrip® TruMotion® polymer timing belts. Specify these belts when your application demands a clean running - reduced dust operation, low noise and a durable wear surface which withstands high and low temperatures.


Need help in identifying a timing belt?
Call for assistance or click here.

Design Your Belt and Pulley Drive System

Timing Belt Design and Installation Guidelines and Suggestions:
General Guide Lines
Timing Belt Design and Installation Guidelines and Suggestions: Operations Use our Center Distance Design Tool Download: Belt and Pulley Technical Data View Custom & Secondary Operations View Shafts and Shaft Accessories Learn more about Fairloc® Learn more about Shaftloc®


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.

Sprocket and Chain Drive Systems

The most economical chain drive selection usually consists of a combination of:
  • The shortest pitch single strand chain which has the required “design horsepower” rating when used with the desired size sprocket at the selected sprocket speed.
  • The selection of a center-distance that insures a chain wrap of at least 120° (meshing with at least 1/2 of the teeth) on the smaller sprocket.

When selecting sprockets:
  • For long service life and smooth performance, select sprockets with 17 or more teeth, but less than 67.
  • When space limitations are a factor or running at slow speeds, sprockets with less than 17 teeth can be used.

Chain life will vary appreciably depending on the way the drive is lubricated. A properly lubricated chain can last more than 100 times as long as the same chain with poor lubrication.

Ladder chain links interlock and are fabricated from wire. Ladder chain is inexpensive and easy to install and can be found in many household appliances, vending machines and various timing and electrical devices.

SDP/SI offers a wide selection of inch and metric dimensioned roller chain and ladder chain. To complete your drive system both plastic sprockets and metal sprockets designed to work with the chain are available.

Correct operating tension is an important factor in the satisfactory performance and life of a drive system. SDP/SI offers chain and belt tensioning products, as well as tension monitoring tools.

Our engineering staff is available to assist you in selecting the best components for your drive system.

Ball & Lead Screws Bearings Brakes & Clutches Chains & Sprockets Couplings & Flexible Shafts Fairloc® Components Gearheads & Speed Reducers Gears Hardware & Miscellaneous Components Linear Guide Systems Miniature Belts & Pulleys Miniature Gears Miniature Shaft & Shaft Accessories Motors Right Angle Drives Rollers - Feed & Idler Shafts & Accessories Shaftloc® & Accessories Synchromesh Drive Systems Timing Belts & Cables GT® Timing Belts HTD® Timing Belts 40 D.P. Timing Belts MXL Timing Belts XL Timing Belts L Timing Belts Timing Belt Profile (Detail) Timing Belt Pulleys Universal Joints Vibration Mounts
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