2a thread class right-hand 0.641" thread length double hexagon extended washer head style 0.109" grip length 18 thread quantity per inch unc thread series
2a thread class right-hand 0.281" thread length flat chamfer head style 32 thread quantity per inch head vertically knurled passivate fastener surface treated unc thread series
3a thread class right-hand 0.593" thread length headless (setscrew) head style 32 thread quantity per inch two drilled holes 0.045 in. dia unf thread series
2a nut thread thread class left-hand stud thread 0.562" stud thread thread length 1.625" overall length 16 nut thread thread quantity per inch w/wrenching flats 0.375 in. l on stud center unc nut thread thread series