2a single mounting facility thread class 2.812" overall length 1.468" overall width 12 single mounting facility thread quantity per inch un single mounting facility thread series
2.314" overall length 1.734" overall width 32 single mounting facility thread quantity per inch tap, square frame unc single mounting facility thread series
2a single mounting facility thread class 1.620" overall length 1.400" overall width 32 single mounting facility thread quantity per inch unc single mounting facility thread series