3a thread class right-hand 1.000" thread length headless (setscrew) head style 20 thread quantity per inch navy special project passivate surface treated unf thread series
2a thread class right-hand 0.255" thread length hexagon head style 32 thread quantity per inch nonstandard point tapered 1 to 50 on dia unf thread series
2a thread class right-hand 0.260" thread length headless (setscrew) head style 36 thread quantity per inch point undercut under thread uns thread series