Stock Drive Products/Sterling Instrument 
Rotary Drive Components. 

The leader in design and manufacture of precision and commercial grade drive components."  "Standard or Custom metal and plastic parts from a single source.


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  • Pulleys
  • Belts
  • Gearheads
  • Couplings
  • Gears
  • Bearings
  • Speed Reducers
  • Flexible Shafts
  • Racks & Pinions
  • Shock & Vibration Mounts
Underwood Sales
has been representing SDP/SI in New England since 1982.

We maintain select ineventory and can provide direct answers to most of your
SDP/SI questions.

Contact Us to help assist you in your product representative needs.
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BELT PRODUCTS
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GEARS/GEARHEADS
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FLEXIBLE SHAFTS
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SHOCK/VIBRATION MOUNTS
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RACKS/PINIONS
 


Underwood Sales Corporation | 1-888-781-2900 | sales@underwoodsales.com