2b second mounting facility thread class right-hand second mounting facility 3.250" overall length 3.090" overall width 32 second mounting facility thread quantity per inch unc second mounting facility thread series
Used on 4920nc50400p. 2a single mounting facility thread class right-hand single mounting facility 0.171" single mounting facility thread length 1.165" overall length 0.735" overall width 48 single mounting facility thread quantity per inch unc single mounting facility thread series
Used on adapter. 2a single mounting facility thread class right-hand single mounting facility 0.171" single mounting facility thread length 1.375" overall length 0.735" overall width 48 single mounting facility thread quantity per inch unc single mounting facility thread series