This series of BEARHUG Locknuts, with a nylon collar, is the mainstay of the precision self-locking nuts. It is designed for the same shaft dimensions as are the N and AN locknuts, but with the added features of self-locking and super precision wherein it has become a most important component for precision bearing and power transmission assemblies.

The runout of the bearing face of these nuts to the pitch diameter of their threads have a one revolution total indicator reading no greater than: .0004 inches for sizes 00 through 04, .0006 inches for sizes 05 through 20, .0008 inches for sizes 21 through 40.

Seating surface is within 40 micro-inches.