Our brands supplying:
Timing Belts, Timing Belt Pulleys, Sprockets, & Chains
Timing Belt Center Distance Designer
Get the right pulley and timing belt combination and instantly identify the appropriate part numbers that meet your specifications.
Try the 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.
Timing Belt Design and Installation Guidelines and Suggestions: General Guide Lines
Timing Belt Design and Installation Guidelines and Suggestions: Operations
Download: Belt and Pulley Technical Data
View Custom & Secondary Operations
View Shafts and Shaft Accessories
Learn more about Fairloc®
Learn more about Shaftloc®
LOOKING FOR A CUSTOM TIMING PULLEY?
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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
• 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 70 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 your apllication's 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
Other drive components offered are: PosiDrive, Synchromesh, round belts, flat belts, fractional H.P. V-belts and belt clamps.
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.
COMMERCIAL AND PRECISION TIMING BELT PROFILES:
Materials: Neoprene, Polymer Compound, Polyurethane, Nylon, Stainless Steel
Pitch: 1mm - 9.525mm or 3/8 in
Circular Pitch: 0.09820 in. (2.494mm) - 0.15708 in. (3.99mm)
Profiles: 40 DP, GT®, HTD®, L, MXL, Posi-Drive Synchromesh, T, XL
INCH AND METRIC PLASTIC OR METAL TIMING BELT PULLEY:
Materials: Aluminum, Steel, Acetal, Nylon, Polycarbonate
Pitch: 0.080mm - 9.525mm
Profiles: 40 DP, GT®, HTD®, FHT®, L, MXL, T, XL
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.
COMMERCIAL TIMING PULLEY STOCK:
Materials: Aluminum, Steel, Carbon Steel
Profiles: GT®, HTD®, FHT®, L, MXL, T, XL
Pitch: 3mm or 1/5 in
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.
COMMERCIAL SHAFTLOC® PULLEYS:
Materials: Nylon with Steel Insert
Pitch: 3/8mm or 1/5 in
Profiles: XL, L, HTD®
Our Shaftloc® Pulleys are molded with a metal insert and are available with single or double flanges.
COMMERCIAL CABLES AND FITTINGS:
Materials: Stainless Steel, Nylon Coating with Brass Fitting
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.
PRECISION POSI-DRIVE SPROCKETS:
Materials: Stainless Steel, Aluminum
Pitch: 20 & 32
Circular Pitch: 0.1475
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.
Materials: Polycarbonate, Aluminum
Profiles: XL, L, HTD®, GT®2, AT. T. MXL
COMMERCIAL FLAT BELTS:
Materials: Woven Polyester, Neoprene
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.
COMMERCIAL FLAT TIMING BELT PULLEYS:
Materials: Polycarbonate pulley with Brass or Aluminum insert
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.
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:
COMMERCIAL ROUNTHANE BELTS - INCH:
COMMERCIAL ROUNTHANE BELT CONNECTOR - INCH:
Aluminum connectors are sold for use with our non-slip polyurethane belting.
COMMERCIAL & PRECISION GROOVED IDLER PULLEYS:
Materials: Nylon, Acetal, Stainless Steel
Aluminum connectors are sold for use with our non-slip polyurethane belting.
COMMERCIAL & PRECISION GROOVED PULLEYS:
Materials: Acetal, Brass
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 HP - INCH:
Materials: Reinforced Rubber
Pitch: 9.6 - 32
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.
COMMERCIAL V-BELT PULLEYS:
Materials: Nylon, Aluminum Hub
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.
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).
COMMERCIAL SYNCHROMESH PULLEYS:
Materials: Acetal with Brass Insert
Pitch: .120 - .250
* Aluminum inserts used on .250 pitch 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.
COMMERCIAL SYNCHROMESH ATTATCHMENTS:
Materials: Copper, Stainless Steel, Nylon
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.
COMMERCIAL TENSION TESTER, PENCIL TYPE - INCH:
TENSION TESTER, SONIC TYPE - INCH:
COMMERCIAL BELT & CHAIN TENSIONERS:
Materials: Aluminum or Steel with Nylon, Acetal, Steel, and Stainless Steel Roller
A variety of chain tensioners are offered by SDP/SI. Maintaining proper belt and chain tension protects equipment and results in long and trouble-free operation of drive systems.
COMMERCIAL LADDER CHAINS:
Materials: Stainless Steel, Brass, Steel
Pitch: .167 - .375
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:
Materials: Stainless Steel, Brass, Steel, Acetal
Pitch: .1227 - 3/8
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:
Materials: Stainless Steel, Nylatron GS, Polypropylene, Acetal, Polyvinylidene
Pitch: .1227 - 3/8
Molded sub-miniature 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 CHAINS SPROCKETS:
Materials: Stainless Steel, Nylatron GS, Steel, Acetal, Nylon
Pitch: .1227 - .250
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.
Our sister division, QBC, offers monitoring and maintenance tools for power transmission components.Attain Fast and Accurate Pulley Alignment
Get tools that are easy to use:
Fast and accurate readings
Easy one-person operation
Displays parallel and angular misalignment
Both horizontal and vertical mounted machines
Safely Mount Bearings in the Workshop or On Site
Use safe, environmentally friendly and energy efficient tools to mount bearings and other drive components:
Portable Handheld Induction Heaters
Portable Table-Top Induction Heaters
Impact Fitting Tools to avoid unnecessary damage and premature failure
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