Used on recording subsystem sdv mk8 mod1. 2a thread class right-hand 0.312" thread length flat countersunk head style 56 thread quantity per inch screw machine 82 degrees unc thread series
3a thread class right-hand 0.425" thread length dished hexagon head style 0.740 mils grip length 28 thread quantity per inch bolt tension hex head close tolerance A286 cres long thread reduced major thread dia self locking item is unplated bolt with a drilled shank passivate surface treated unjf thread series