NI Retaining Nut

This series of locknuts with the National Fine Thread Series with 16 threads per inch made to Class 3B tolerances is designed to be used with bearings and other power transmission components with fractional inch bores as well as by manufacturers preferring not to use the SAE-AFBMA series of locknuts which was an inch modification of metric locknuts early in the twentieth century.

Much heavy duty equipment is designed with this series of the BHI self locking series where the WI lockwasher need not be used. Construct ion equipment, metal cutting and metal forming machinery, mining equipment, conveyors, crushers, shipboard machinery, turbines and many other applications where the load is great and with much more shock and vibration these heavier nuts are well suited.

Most importantly, it is a locknut to use when you wish for a good ground floor inch design with the superiority of fine threads and lockwashers.