SDP/SI – Stock Drive Products/Sterling Instrument

Partner Early. Scale Confidently. Produce Efficiently.

SDP/SI specializes in motion control and power transmission technologies, offering a comprehensive portfolio of precision components and engineered subassemblies. The company supports engineers with both off-the-shelf products and highly customized solutions designed to meet the specific requirements of OEM applications.

Its extensive product range includes:

• Gears and gearheads
• Timing belts and pulleys
• Bearings and linear motion products
• Couplings and universal joints
• Speed reducers and increasers
• Shafting and fasteners

Engineers can access these components through the SDP/SI 24/7 e-Store, which provides detailed technical specifications and downloadable 3D CAD models for seamless integration into design workflows. In addition to mechanical components, SDP/SI offers motors, gearheads, and motion control systems, enabling customers to develop complete drive solutions using components engineered to work together efficiently.

A Strategic Manufacturing Partner for OEMs

Beyond supplying high-quality components, SDP/SI serves as a strategic manufacturing partner for original equipment manufacturers (OEMs). The company prioritizes early collaboration during the product development process, allowing its engineering team to provide design-for-manufacturability guidance and identify potential production challenges before they impact cost, quality, or timelines.

By participating in design reviews and prototype development, SDP/SI helps customers refine component designs, validate performance, and prepare products for scalable production. This collaborative approach reduces development risk while improving manufacturing efficiency and overall product reliability.

These capabilities are particularly important for industries such as:

• Medical Devices
• Robotics and Automation
• Aviation, Defense, and Aerospace 

where consistent quality and reliability are essential.

End-to-End Engineering and Manufacturing Support

From prototype development to full-scale production, SDP/SI provides OEMs with comprehensive engineering and manufacturing support. By integrating engineering collaboration, precision component supply, and scalable production capabilities, the company helps customers accelerate development timelines, reduce production costs, and maintain consistent quality.

As a key brand within Designatronics, SDP/SI combines deep engineering knowledge with an extensive component portfolio and advanced manufacturing expertise—providing a reliable source for precision motion control and power transmission solutions that transform innovative designs into successful products.

U.S. Manufacturer of Power Transmission and Motion Control Components since 1950.

Explore all the SDP/SI Options! 

Categories
Heat Treating Services | Gear Blanks | Black Oxiding | Blast Cleaning | Brazing | Induction Hardening | Nitriding | Other Machinery & Equipment | Assembly | Gear Design Consulting | Gear Engineering Consulting | Gear Finishing Services | Cams | Publications and Other Media | Trade Shows | Geared Actuators | Ball Bearings | Angular Contact Ball Bearings | Miniature Ball Bearings | Bush Bearings | Journal Bearings | Linear Bearings | Magnetic Bearings | Pillow Blocks | Plain Bearings | Rod Ends | Needle Roller Bearings | Spherical Roller Bearings | Tapered Roller Bearings | Sintered Bearings | Spherical Bearings | Thrust Bearings | Bushings | Thin-Section Bearings | Chain Drives | Chain-Belt Tensioners | Metal Chain Sprockets | Plastic Chain | Plastic Chain Sprockets | Roller Chain | Belt Drives | Belt-Chain Tensioners | Flat Belt Pulleys | Flat Belting | Polyurethane Belts | Round Belt Pulleys | Round Belting | Sheaves | Synchronous Belt Pulleys | Synchronous Belting | Timing Belts | Polyurethane Timing Belts | Timing Pulleys | V-Belt Pulleys | V-Belting | Electromechanical Brakes | Hysteresis Brakes | Magnetic Particle Brakes | Spring-Wrap Brakes | Combination Clutch-Brakes | Hysteresis Clutches | Magnetic Particle Clutches | Magnetic Synchronous Clutches | Mechanical PTO(Power Take-Off) | Mechanically Actuated Friction Clutches | Slip Clutches | Spring-Wrap Clutches | Motor-Controller Units | Disc Couplings | Flexible Beam Couplings | Flexible Metallic Couplings | Flexible Nonmetallic Couplings | Gear Couplings | Magnetic Couplings | Metal Beam Couplings | Metal Bellows Couplings | Rigid Couplings | Spider Couplings | Universal Joints | Taper Bushes | Flexible Shafts | Shaft Couplings | Bellows Couplings | Aerospace Gears | Coarse Pitch Gears | Custom Gear Manufacturing | Fine Pitch Gears | Geared Shafts | Ground Gears | Helical Gears | Hypoid Gears | Internal Gears | Internal Splines | Medium Pitch Gears | Miniature Gears | Miter Gears | Non-circular Gears | Non-lubricated Gears | Pinion Wire | Planetary Gears | Plastic Gears-Cut | Plastic Gears-Injection Molded | Racks | Ratchets | Ring Gears-Internal | Spiral Bevel Gears | Splined Shafts | Sprockets | Spur Gears | Stock Gears | Straight Bevel Gears | Worm Wheels | Worms | Bevel Gears, Straight | Bevel Gears, Spiral and Hypoid | Gear Blanks | Aerospace Gearboxes | Bevel Gear Drives | Differential Gear Drives | Torque Control Differentials | Non-lubricated Gear Drives | Gearbox Housings | Gearboxes | Custom-Built Gearboxes | Helical-Bevel Gearboxes | Hollow Shaft Gearboxes | Inline Gearboxes | Right Angle Gearboxes | Gearheads | Planetary Gearheads | Gearmotors | Helical Gear Drives | Planetary Gear Drives | Rack and Pinion Drives | Right Angle Drives-Clutching | Right Angle Drives-Reversing | Shaft Mounted Speed Reducers | Speed Increasers | Speed Reducers | Spur Gear Drives | Worm Drives | Bevel Gear Manufacturing | Broaching Services | Deburring Services | Gear Finishing Services | Gear Hobbing Services | Gear Rack Manufacturing Services | Prototype Manufacturing | Stock Gear Manufacturing | Gear Design Consulting | Anti-Backlash Nuts | Ball Screws | Lead Screws | DC Brush-Type Motors | DC Brushless Motors | DC Motors | Gearmotors-Synchronous | Fractional HP motors | Anti Vibration Mounts | Base Plate Fastened Mounts | Bumpers | Bushing & Gromet Mounts | Cam Followers | Cams | Damping Mountings | Drive Tensioners | Pulleys | Gel Mounts | Indexing Drives | Pads & Tapes | Robotic Components | Rubber Mountings | Shaft Collars | Shock Absorbers | Vibration Dampers | Vibration Isolators | Vibration Mounts | Vibration Pads | Retaining Rings | Hardware | Knobs | Pins | Plungers | Wave Springs | Machine Keys | Shims | Spacers | Springs | O-Rings | Trade Associations | Gear Design | Gear Blanks & Raw Material | Heat Treating | Resources | Services | Gears | Gear Drives | Gear Manufacturing Services | Accessories | Bearings | Belting & Belt Drives | Chain & Chain Drives | Brakes | Clutches | Controls | Couplings & U-Joints | Industrial Hardware and Machine Parts | Linear Motion Devices | Motors | Seals |