Stem Pinions | Boston Gear

Boston Gear's stem pinions feature small numbers of teeth that are cut integral to the steel shaft. Using a special, enlarged pitch diameter minimizes the undercutting of the teeth. When run with standard stock spur gears, stem pinions increase the ratios normally found in spur gear drives.

Please note: Stem pinions are not intended to be operated with each other, with internal gears, or with eleven-tooth spur gears. They will, however, run satisfactorily with all other standard 14 1/2° PA spur gears.

Many different gears with a variety of bore sizes, keyways, and setscrews are routinely in stock, but if the particular bore/keyway/setscrew combination needed is not readily available, our machining experts can alter any non-hardened gear and ship it within 24 hours. Just ask!

Product Features

  • Boston Gear's stem pinions have a smaller number of teeth than standard spur gears.
  • Teeth are cut integral to steel shaft for greater dependability.
  • Stem pinions facilitate higher gear ratios than are possible with spur gear drives for improved operation.
  • Boston Stem Pinions can be readily used with standard 14 1/2° PA spur gears.
  • Available from 20 DP to 6DP (Diametral Pitch)

Product Data Sheets

  • p-1930-bg_spur-gears
Click on image below to download pdf. To order hard copies of literature click here.

Product Catalog

  • Rotary Drive Products Gears, Bearings, Couplings & Shaft Accessories

Related Literature

  • Boston Gear Line Card

Product News

Contact Info

Boston Gear
701 Carrier Dr.
Charlotte, NC 28216
Phone: 1-888-999-9860

Boston Gear Stem Pinion