div class=trans-pagebuttonPage 1button div class=trans-image amp-img class=trans-thumb alt=Page 1: Standard Inch Pitch Diameters - Thread Check Inc · PDF fileun unc unf unef unc unf standard inch pitch basic 2b 3b 2a 3a 32 28 32 20 28 32 18 32 16 24 32 14 20 28 12 13 src=https:reader030fdocumentsusreader030viewer20220215095a9db2457f8b9a96438b7f5ehtml5thumbnails1jpg width=142 height=106 layout=responsive amp-img diva href=http:wwwthreadcheckcom rel=ugc nofollow target=_blankhttp:wwwthreadcheckcomadiv