456AZ Gear Tooth Vernier Caliper

456, 456M Gear Tooth Vernier Calipers
Gear Tooth Vernier Slide Caliper, 0-1-1/4"

The Starrett 456 Gear Tooth Vernier Caliper is designed to measure in .001" or 0.02mm the thickness of gear teeth at the pitch line (the chordal thickness of the teeth) using the distance from the top of a tooth to the chord. For the same purpose, it can also be used for measuring hobs, form and thread tools, etc. 20-2 Diametral Pitch in Case.

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  • Can be used for measuring hobs, form and thread tools
  • Adjusted independently by screws on the graduated bars
  • Thickness of a tooth at the pitch line is measured by an adjustable jaw after the addendum is set by the adjustable tongue


  • Made in America: Yes
  • Range (in): 0 to 1-1/4"
  • Graduations (in): .001"
  • Accuracy (in): +/-.0005" per foot

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    California Proposition 65 Warning

      WARNING: This product can expose you to chemicals including lead, which is known to the State of California to cause cancer, and birth defects or other reproductive harm. For more information go to: www.P65Warnings.ca.gov