3b thread class right-hand 1.8125" overall length 0.3120" bore diameter 24 thread quantity per inch chromium inner member surface treated ball type unf thread series
3a thread class right-hand 1.9680" overall length 0.2485" bore diameter 28 thread quantity per inch chromium inner member surface treated ball type unf thread series
12.0mm overall width 17.0mm bore diameter 250b single row, non-locating, one lip inner ring, cylindrical outer ring with two roller retainment rings on outer, separable