2a thread class right-hand 0.325" thread length pan head style 40 thread quantity per inch passivate screw surface treated enamel color gray unc thread series
2a thread class right-hand 0.200" thread length flat countersunk head style 28 thread quantity per inch passivate screw surface treated 0.188 in. min 0.190 in. max dia thru hole on longitudinal axis unf thread series
2a thread class right-hand 0.190" thread length flat countersunk head style 24 thread quantity per inch passivate screw surface treated 0.138 in. min 0.143 in. max thru hole on longitudinal axis unc thread series
2a thread class right-hand 0.202" thread length knurled no. 4 head style 32 thread quantity per inch navy special project passivate surface treated unc thread series
flush (flat) countersunk (included angle - less than 135 deg w or w/o chamfer) head style 0.376" grip length ns" letters after the material code "b" indicate no preference to lock type (may be visible or internal) . rivets with no letter code (indicating visible lock type) cadmium stem surface treated