C391 Center Gage 51475

The Starrett C391 Center Gage features inch graduations, meets the American Unified National Standard and US 60 degree standards. American unified National Standard, 60 Deg.

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  • Extremely handy for use in grinding and setting screw cutting tools
  • American National or U.S. 60 Deg standards
  • Very useful for finding number of threads per inch through graduations in 14ths, 20ths, 24ths and 32nds of an inch.
  • Gage also has a table of double depths of threads for determining size of tap drills.
  • Made of spring-tempered steel with satin chrome finish.
  • Ground gaging surfaces


  • Range (Deg): American Unified National Standard, 60º
  • Material: Steel