3b thread class right-hand 2.2000" overall length 0.2500" bore diameter 28 thread quantity per inch size no. 50 hole in shank 0.440 in. from shank end parallel w/bore, size no. 50 hole in. shank 0.900 in. fromshank end 90 deg from bore cadmium outer ring surface treated single row, concave rollers unjf thread series