2a single threaded bushing thread class 0.156" single threaded bushing thread length 3.670" overall length 24 single threaded bushing thread quantity per inch weapon systen essential cylindrical unf single threaded bushing thread series
2b thread class right-hand 2.776" overall length 1.703" overall width 32 thread quantity per inch cadmium surface treated hood type w/flange unc thread series
Used on armt stm hel m27. 2a single mounting facility thread class 2.780" overall length 2.000" overall width unc single mounting facility thread series