Designatronics is pleased to announce the launch of its new online store, shop.sdp-si.com. The newly redesigned E-Store will continue to showcase the combined offering of all three Designatronics brands, SDP/SI, QBC, and QTC Metric Gears, while providing an improved customer experience. (read more)

New disk type flexible couplings are an economical option while providing greater torque capability and improved performance in a reduced size. (read more)

Comprehensive selection of precision cut synchronous timing belts are offered by SDP/SI suitable for applications in the fields of medical, defense, automation and robotics. Stock timing belts are available for fast delivery in a wide range of profiles, materials, widths and numbers of grooves. We look forward to working with you. (read more)

Comprehensive selection of high-quality synchronous timing pulleys, many with the Fairloc® Hub design, are manufactured by SDP/SI suitable for applications in the fields of medical, defense, automation and robotics. Stock timing pulleys are offered for fast delivery in a wide range of types, materials, and numbers of grooves. We look forward to working with you. (read more)

Comprehensive selection of high-quality precision gears, many with the Fairloc® Hub design, are manufactured by SDP/SI suitable for applications in the fields of aerospace, medical, defense, and robotics. Stock gears are offered for fast delivery in a wide range of types, pitches, modules, materials, and numbers of teeth. We look forward to working with you. (read more)

As a leader in providing drive solutions, SDP/SI partners with companies to develop integrated systems that meet their specific needs. Offering a comprehensive selection of high-quality products, SDP/SI frameless motors are designed to fit easily into smaller machines requiring precision, high efficiency, low inertia, and high torque density. Learn more. (read more)

Stock Drive Products / Sterling Instrument offers a comprehensive selection of bearings, suitable for a wide variety of applications. Select No Shield, Single Shield, Double Shield and type of lubrication, various materials, and ABEC specifications. Stock components are available online, download product detail and 3D CAD models, Shop SDP-SI! (read more)

Stock Drive Products/Sterling Instrument stock gear racks are available in a wide range of pitches, modules, and materials, including steel, hardened steel, brass, stainless steel, machined cast nylon, molded acetal, and aluminum. Shop SDP/SI - One single source! (read more)

SDP/SI provides engineered mechanical solutions to many of the most recognized names in the medical industry. With proven performance and unsurpassed experience we are an established leader in precision manufacturing of standard and customized gears, mechanical components and complex gear assemblies. We look forward to working with you! (read more)

Uniquely designed flexible coupling provides problem solving benefits. SDP/SI adds flexible couplings that resolve vibration while operating in a high-speed servo system at high gain settings. Satisfy all your mechanical component requirements at SDP/SI. Download product specifications and request our latest catalog, a must have reference tool. (read more)

High-quality special purpose screws provide problem solving benefits. SDP/SI adds stainless steel and alloy steel with black oxide or nickel plating captive screws, low profile screws, miniature captive screws and small head diameter screws. Satisfy all your mechanical component requirements at SDP/SI. Download product specifications and request our latest catalog, a must have reference... (read more)

SDP/SI products are available with a wide range of standard features for easy integration intended for industrial automation applications. The Integrated Motor Controllers include state-of-the-art brushless servo motors with 4096 lines encoder and CANOpen network protocols in an intelligent plug-and-play package. Shop SDP/SI! (read more)

Single core and twin core Posi-Drive Belts and Sprockets excel in applications that require accurate positioning and no lost motion. As an example, 3D printers benefit from this advantage as more precise positioning will result in higher quality parts being created. Another advantage is quiet operation due to the no-flange design of the sprockets. Download product specs! (read more)

SDP/SI stock planetary gearheads include the high performing, extremely efficient PAC series (S91..(A,T)MPAC) and PAN series (S91..(A,T)MPAN) equipped with a NEMA output flange. For dependable performance, design, mounting, and value shop SDP/SI for gearheads, motors, and motion control products. (read more)

For precise alignment and ease of use nothing surpasses the SDP/SI Fairloc® Hub Design. Shaft Collars manufactured by SDP/SI (ISO 9001 + AS9100 Registered) feature this unique hub design. Shop SDP/SI! (read more)

Configure your timing belt and pulley drive system. Timing belts and pulleys in a variety of materials, sizes and numbers of teeth are offered by SDP/SI. Thousands of stock components are available for immediate delivery. Download product specs, technical data and shop 24/7. (read more)

Miniature pillow block mounted ball bearings are ideal in applications with limited space. With an aluminum housing, stainless steel bearing and double shielding, they have excellent corrosion resistance, making them suitable for medical, scientific and pharmaceutical applications. (read more)

Specializing in problem solving components and engineered solutions, SDP/SI manufactures precision gears that offer the best of both worlds: noise reduction benefits of acetal rim gear teeth along with the strength and stability of an aluminum core assembled onto a stainless steel hub. Identified as S1268Z-…M series, get product specifications here. Note the unique Fairloc... (read more)

Constant force extension springs are designed to be used in any application that requires a smooth, even, uniform load through the entire length of travel (deflection) for retracting or extending. (read more)

Fasten rotating components to a shaft quickly. Because of its uncomplicated 2-piece design, the Shaftloc® Fastener is easy to install and is low cost. Since there are no set screws, it can be reused and adjusted repeatedly without damaging the shaft. (read more)

SDP/SI manufactures metal and nonmetallic pulleys in a variety of profiles, sizes, styles and numbers of teeth. To ensure long life and quiet operation in your application our pulleys are made to the exact timing belt profile. To complete your drive system, get your timing belts from SDP/SI. (read more)

SDP/SI specializes in linear motion applications, manufacturing precision shafting in steel and stainless steel to tight dimensional tolerances and exceptional straightness. Customized options such as grooves, lengths, diameters, finishes and special features are available. (read more)

Precision shaft differentials manufactured by SDP/SI, feature built-in anti-backlash characteristics for eliminating play in shaft rotations. Identified as part number S9540A-TS9, the differential provides a high level of precision in instrument drives and is particularly effective at adding and subtracting shaft rotations in servo systems. (read more)

Made of wear-resistant polymer and shock-resistant reinforced plastic, these bearings are lightweight, vibration dampening and provide excellent performance in moisture, chemicals and dusty environments. Strong and durable, they have a high strength-to-weight ratio and long service life. (read more)

Precision anti-backlash gears manufactured by Stock Drive Products/Sterling Instrument,ISO 9001 + AS9100 certified, feature the exclusive Fairloc® integral hub which allows precise positioning on the shaft. These gears are compact, self-contained and offer a small gear hub envelope. (read more)

Designed for miniature applications the SDP/SI right angle gear drives feature lightweight, non-corrosive, all metal construction. Identified as the A 2Z1A-... series, the standard mount gear drives are made of anodized aluminum housings and hardened steel helical gears. Also offered are base-mounted and panel-mounted miniature right angle helical gear drives with a fiberglass rei... (read more)

Precision gear & dial hubs from SDP/SI are designed to fit gears or dials and eliminate keys or splines. Identified as the S2F06Y-.... series, these 303 stainless steel hubs feature our patented Fairloc® design. The compact self-contained design is perfect when hub O.D. is limited. (read more)

SDP/SI offers a new, low backlash variant on its existing line of multi-plate in-line slip clutches. Both versions feature an all mechanical design, which makes them considerably cheaper than electromechanical alternatives. Identified as the S98CA7-... series, these low backlash clutches are perfect when precision is required and space is limited. (read more)

Anti-backlash gears manufactured by SDP/SI (ISO 9001 + AS9100D Registered) feature an effective way to eliminate backlash in gear trains that include small-diameter gears. Designated as pin-type mini-lash gears, each gear is composed of a set of two gear halves that give the appearance of a split gear. (read more)

Identified as the A 6H25-... inch series and the A 6H25M... metric series, these 5 mm pitch HTD® timing belt pulleys, for 9 mm (.354") wide belts are available from off-the-shelf stock in single or double flange styles. They are designed to fit onto shafts that range from 3/16" to 5/16" (4 mm to 8 mm) in diameter. The number of grooves per pulley ranges from 11 to 50. (read more)

Bellows couplings from SDP/SI incorporate the patented integral Fairloc® hubs which feature built-in overload protection, full use of the bore, easy adjustment, eliminates marred shafts, and offers a compact self-contained design. These couplings correct for angular and parallel axis misalignment, provide zero backlash, offer constant angular velocity, and dampens vibration and noise. (read more)

Commercial and precision spur gears manufactured by Stock Drive Products/Sterling Instrument are produced to ISO Class 7 specs and stocked in a wide variety of materials including stainless steel, aluminum, aluminum alloy, nylon, acetal, brass and steel. Our spur gears are available in 120, 96, 80, 72, 64, 48, 32, & 24 Pitch with pressure angles of 20° degrees and 14-1/2° deg... (read more)

SDP/SI's Miniature Fairloc® bellows couplings are zero backlash, easy to install and corrects for angular and parallel axis misalignment. Readily repositioned, the miniature couplings dampen vibration and noise making them a perfect choice for medical device manufacturers. (read more)

These shaft reducers and extenders from SDP/SI eliminate the need for special shafting. There are 20 inch and 27 metric size stainless steel adapters, identified as the S52FCY-... inch series and S52FCYM... metric series, are high precision, with tight tolerances on bores, shank and bore/shank concentricity. The female end of the adapter is designed to fit shaft diameters r... (read more)

SDP/SI offers an off-the-shelf series of inch and metric size splined sleeve type flexible couplings that offer torsional resiliency to absorb load pulsations and shocks in instrumentation applications. The couplings can accommodate up to 7 degrees of angular misalignment and transmit up to 1/2 hp at 1750 rpm. (read more)

A new series of inch couplings from SDP/SI feature unique lattice design allows for very large axial, radial, and angular misalignments while transmitting high torque loads with zero backlash. The 34 couplings identified as the S50CLM-... and S50CLP-... inch series, feature a maximum angular offset of 7°. A complete series of 24 metric lattice couplings with similar spe... (read more)

SDP/SI (ISO 9001 + AS9100D Registered) offers several different series of pulleys for 1/5" small pitch timing belts. They offer positive, efficient power transmission for belt drives, with no slip or backlash and minimal vibration. These pulleys are designed to operate with synchronous toothed belts. (read more)

SUPER-PLAST^® molded universal joints offer the best of both worlds: the economy of plastic, and the fastening characteristics of metal-to-metal contact. Developed for a wide variety of instrumentation applications, these joints have thick-walled molded plastic hubs for a lightweight, durable and economical design. (read more)

Precision internal gears from Stock Drive Products / Sterling Instrument (ISO 9001 + AS9100D Registered) are available from stock in inch and metric sizes. These 20° pressure angle inch gears are offered in 303 stainless steel or 2024-T4 anodized aluminum. The metric gears in Modules 0.5, 0.8, & 1 are ISO Class 7 and are stocked in 5, 8 & 10 mm face widths. (read more)

SDP/SI's lead screw selection is vast, with many different diameters, lengths, and number of starts available, as well as left-hand threads for certain sizes. The nuts come in several different materials and styles, including anti-backlash, ensuring that every linear motion application can be fitted with just right part. (read more)

Plastic cam followers, identified as the S7NSRY-... series, are designed to transmit motion and carry load in today's high-speed and light-duty machines in medical, packaging, and semi-conductor equipment. These cam followers allow clean operation and will not contaminate product or surroundings with lubricant or metal flakes. (read more)

SDP/SI offers a large selection of precision ground shafting to fit a wide variety of applications. With straightness as low as .0002 inches per inch, they provide highly precise alignment where necessary. Diameters start as low as .0311”, and shaft lengths as low as 1”, so they can be used for miniature applications as well. (read more)

Established 1950, SDP/SI provides engineering development and CNC manufacturing for a wide range of applications. Creating precision gears, superior mechanical components, and customized solutions our engineers assist with aerospace, medical, defense, and robotics applications. ISO9001+AS9100 certified. Call or request a quote online. SDP/SI, stock and custom – one single source. (read more)

SDP/SI manufactures gears, mechanical components, and complex gear assemblies for many of the most well-known names in aerospace, medical and robotics. Engineering and manufacturing processes are done in house, giving us better control over lead times and responsiveness to our customer's requests. See what we can do for you! (read more)

Drawing from 70 years of gear and small mechanical component manufacturing experience, customers benefit from our expertise. Design improvements may include a more streamline design, smaller and lighter weight, and better manufacturability leading to cost saving benefits. Our engineers look forward to working with you – let’s talk about your next project! (read more)