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.

• 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.

• Construction
• Presses
• Feed drives
• Packaging
• Material handling