Locking nuts

FINE U-NUT
Prevailing-torque type Locknut
FINE U-NUT was developed in order to minimize the costs involved in securing bearings by Fuji Seimitsu Co., Ltd. a pioneer in lock nut technology.
With more than 30 years experience in the manufacture of FINE U-NUT we can supply solutions to your most difficult applications.

TWIN FU-NUT
Prevailing-torque type Precision Locknut
Fuji Seimitsu Co., Ltd. who developed the FINE U-NUT which does not require a machined key-way for locking, has developed industry´s first TWIN FU-NUT, a prevailing-torque type high precision nut. The TWIN FU-NUT is a breakthrough in bearing locknuts, delivering "accuracy of thread", "accuracy of bearing surface run out", and "locking performance" all in one easily assembled precision lock nut.