2a thread class right-hand 2.000" thread length flat countersunk head style 40 thread quantity per inch passivate screw surface treated unf thread series
3a thread class right-hand 1.570" thread length hexagon extended washer head style 6 thread quantity per inch 1 hole in threads 0.281 in. dia; unthreaded portion of bolt at end 1.120 in. dia by 1.060 lg unc thread series