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SPI Spindle Squares

Product Description


SPI Spindle Squares

3/8 Inch Shank Diameter, Drop Indicator Spindle Squares
For Use with Dial Indicators

A simple solution to squaring your machine. Just zero indicators on flat surface (like a granite plate), install in milling machine spindle, bring the spindle down to the table and adjust the head until both indicators read the same.


  • 3/8" shank.
  • Fully assembled with indicators mounted and ready for use.
  • No more tramming or split reading, compensating for loose, worn gears or mirrors.
  • Can also be used with a sine bar or protractor to set angle.
  • Constructed of steel with precision ground contact points for durability and accuracy
  • Mini inch model designed for mini-milling or table-top machines and comes in leather pouch.
  • All other models furnished in fitted case.