Starrett No. C391 Series Center Gage
Extremely handy for use in grinding and setting screw cutting tools, the gage meets American National or U.S. 60°. It also has a useful scale for finding the number of threads per inch through graduations in 14ths, 20ths, 24ths and 32nds of an inch. The gage also has a table of double depths of threads for determining size of tap drills.
Meets American Unified National Standard, 60°
Made of spring-tempered steel with satin chrome finish
Scale for finding the number of screws per inch
Gaging surfaces ground
Specifications
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