American Standard Thread ring gauge 4" - 6"

The American standard thread ring gauges are applied to inspect outter threaded workpieces produced by American national standards as well as American federal standards. Specification Accuracy ≥d d2 d1 D B 4-4UNC Go 2A 101.514 97.363 94.615 170 56 NoGo 101.514 97.095 95.728 170 32 4-12UN Go 2A 101.549 100.155 99.243 170 20 NoGo 101.549 100.005 99.553 170 16 4-16UN Go 2A 101.554 100.503 99.819 170 20 NoGo 101.554 100.368 100.03 170 16 4 1/8-12UN Go 2A 104.724 103.32 102.41 170 20 NoGo 104.724 103.177 102.728 170 16 4 1/8-16UN Go 2A 104.729 103.668 102.987 170 20 NoGo 104.729 103.541 103.205 170 16 4 1/4-12UN Go 2A 107.899 106.495 105.585 170 20 NoGo 107.899 106.352 105.903 170 16 4 1/4-16UN Go 2A 107.904 106.843 106.162 170 20 NoGo 107.904 106.716 106.38 170 16 4 3/8-12UN Go 2A 111.074 109.67 108.76 170 20 NoGo 111.074 109.527 109.078 170 16 4 3/8-16UN Go 2A 111.079 110.018 109.337 170 20 NoGo 111.079 109.891 109.555 170 16 4 1/2-12UN Go 2A 114.