3a nut thread thread class right-hand nut thread 1.688" stud thread thread length 9.750" overall length 12 nut thread thread quantity per inch concentric extension on stud end 0.062 in. lg by 1.062 in. dia incl inlg of thd unc stud thread thread series
2a thread class right-hand 1.750" thread length flat countersunk head style 40 thread quantity per inch cadmium screw surface treated unc thread series
3a thread class right-hand 0.335" thread length round extended washer head style 28 thread quantity per inch cadmium screw surface treated unf thread series
2a thread class right-hand 0.626" thread length flat countersunk head style 32 thread quantity per inch passivate screw surface treated unc thread series
3a thread class right-hand 0.562" thread length flat chamfer head style 16 thread quantity per inch head chamfered 1/16 in. by 15 deg unc thread series