3a single threaded bushing thread class 4.875" overall length 20 single threaded bushing thread quantity per inch cylindrical w/flange unf single threaded bushing thread series
2a single threaded bushing thread class 0.436" single threaded bushing thread length 5.200" overall length 1.030" overall width 28 single threaded bushing thread quantity per inch rectangular unef single threaded bushing thread series
2a all threaded stud thread class 0.257" all threaded stud thread length 32 all threaded stud thread quantity per inch disc unc all threaded stud thread series