Precision Gears/Assemblies for Military & Defense

Service Detail from Stock Drive Products & Sterling Instrument - SDP/SI

Stock Drive Products / Sterling Instrument (ISO 9001 + AS9100D Registered) is a world-class high quality manufacturer of standard and custom mechanical components and assemblies. For more than 50 years we have provided design, engineering and manufacturing for a wide variety of applications. Our newly expanded manufacturing facility takes advantage of the very latest technology, including running unattended 24/7, allowing a shorter lead time, saving our customers time and money. Our capabilities include turning, milling, precision gear cutting, bevel gear cutting, belt cutting and assembly. Our extensive high-volume manufacturing facility houses Multi-axis CNC Gear Cutting Equipment, CNC Turning & Milling Machines and Machining Centers, Swiss Turn Machines and more.

SDP/SI specializes in high precision gears and assemblies for the military and defense markets. Our magnetic clutches are utilized in Bradley Fighting Vehicles and our intricate gear assemblies are found in missiles such as the Patriot, Standard or Stinger. We support our troops the best way we know how, by ensuring that all the components we manufacture leave our factory foolproof and ready to operate at its highest level of performance.

Precision Components:

  • Precision Gears
  • Gear Assemblies
  • Bevel Gears
  • Differentials
  • Gearboxes
  • Slip Clutches, Clutches & Magnetic Clutches
  • Mechanical Components (All Types)


  • Aircraft Instrumentation
  • Engine Fuel Control
  • Cargo Movers
  • Missiles & Tanks
  • Pan & Tilt Mechanisms (cameras, lighting) 


  • ISO 9001 + AS9100D Certified
  • RoHS Compliant
  • R.E.A.C.H Compliant
  • NADCAP Approved Facilities
  • Boeing BQMS Certified
  • ITAR Complaint - DDTC Registered
  • ISO Class 7 Cleanroom


  • Gear Tolerance AGMA Quality up to 14 (ISO 4)
  • Diametral Pitch down to 200DP (.02 m)
  • Max. Outside Diameter: 8" (200 mm)
  • Min. Outside Diameter: 1/4" (6 mm)
  • Precision +/- .0001 (+/- 0.003 mm) 

SDP/SI offers a wide variety of inch and metric small mechanical components for the design engineer and OEM. Standard components can easily be located and purchased in one convenient place, shop online 24/7. The engineer not only meets all his component requirements, but saves valuable time by not having to search other sources. For custom design and manufacturing, speak to our engineers at (516) 328-3300.

Quotes, online orders, and 3D CAD models are available at our estore at

SDP/SI - Stock Drive Products/Sterling Instrument, a Designatronics company
250 Duffy Avenue, Hicksville, NY 11801
Phone: (516) 328-3300; (800) 819-8900