3a thread class left-hand 1.9370" overall length 0.2495" bore diameter 28 thread quantity per inch chromium inner member surface treated ball type unf thread series
0.3740" overall width 0.8748" bore diameter one outer ring; two inner rings; 7 to 8 drops of specified lubricant from a no. 27 needle; oil impregnated retainer; torque tested