ASME B1.3 pdf download Screw Thread Gaging Systems for Acceptability: Inch and Metric Screw Threads (UN, UNR, UNJ, M, and MJ) GENERAL (a) This Standard presents screw thread gaging systems suitable for determining the acceptability of UNUNR,UNI M,and M screw threads on externally andinternally threaded products. It establishes the criteriafor screw thread acceptance when a gaging system isused. (b) A...