2a thread class right-hand 0.6250" thread length 2.0312" overall length 20 thread quantity per inch means for relubrication; black oxide surface treatment optional oxide all external/exposed metal surfaces surface treated cam follower unf thread series
3a thread class right-hand 2.1350" overall length 0.2495" bore diameter 24 thread quantity per inch plastic flush type grease fitting, reduced internal fit cadmium all external/exposed metal surfaces surface treated single row, concave rollers unjf thread series
3b thread class right-hand 2.3440" overall length 0.2500" bore diameter 24 thread quantity per inch inspection hole in shank 0.0700 in. dia cadmium all external/exposed metal surfaces surface treated double row, staggered, ball unf thread series