CENTER GAGE (U.S. STANDARD 60)

U.S. NATIONAL STANDARD 60. STAINLESS STEEL Used to grind & position thread cutting tool on lathe. Hardened with lapped edges and notches. Has threads per inch scale in graduations of 14th, 20th, 24th, & 32nd thread checking scales. A table of double depths of threads for determining size of tap drills. Spring tempered steel finish.