2a single mounting facility thread class 1.620" overall length 1.620" overall width 40 single mounting facility thread quantity per inch unc single mounting facility thread series
2a single mounting facility thread class 2.180" overall length 0.990" overall width 40 single mounting facility thread quantity per inch used on t-56 engine aircraft unc single mounting facility thread series
0.469" single mounting facility thread length 6.313" overall length 32 single mounting facility thread quantity per inch tap, circular, bushing mount uns single mounting facility thread series
2a single mounting facility thread class 2.500" overall length 2.000" overall width 32 single mounting facility thread quantity per inch any acceptable surface treated rectangular prism unc single mounting facility thread series