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U Nut
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The pioneer on lock nut technology
FIJI SEIMITSU CO., LTD., JAPAN, the pioneers of the revolutionary Fine-U-Nut, the locknut with a Stainless Steel Insert, has a reputation built over 30 years of service to the industry. The FUJILOCK Fine-U-Nut is used worldwide in many engineering applications and is recognized as the most reliable of all metal locking nuts. The FUJILOCK Lock-Nuts can be customized to fit your unique requirements with regard to specifications, material dimensions and finish.

The company has its headquarters at Osaka, Japan and has its operations at Japan, U.S.A., Australia, Canada, Taiwan, England, France, Italy and Germany. Being an ISO 9001-2000 certified company, FUJI SEIMITSU CO. LTD., produces a range of lock nuts to suit every engineering application.



Certification
Products
The following are their most sought after Lock Nuts :
  • The FUJILOK U-NUT can be customized to fit your unique requirements with regard to material, dimension, and finish. FUJILOK U-NUT is used by Government civil and defense projects, public utility corporation (water, energy), railways, and many leading manufacturers.

  • 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 FUJILOK U-NUT, we can supply solutions to your most difficult applications

  • 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.



Fine u nut

Fine u nut
Construction and Function
The FUJILOK U-NUT is comprises of a nut and stainless steel function ring spring. The friction ring is attached to the top face of the nut by crimping.

A stress P is produced by the spring effect of the stainless steel friction ring coming into contact with the screw thread as shown in the illustration. The P and its reaction force P' press strongly against the screw threads to produce a frictional torque (prevailing torque) above The prevailing prevents the turning of the screw,generation an excellent locking effect.

Fujilok u nut



Fujilok u nut

The FINE U-NUT is a one piece item where the locking function is performed by a spring peened into the top of the nut. In use the spring bears on the flank of the shaft thread with force .P generating reaction force P'in the screw threads with a resulting high friction torque (prevailing torque). The nut therefore remains locked in position.

fine u nut
Features
  • LABOUR SAVING
    certifications MACHINING OF A SHAFT KEYWAY IS ELIMINATED.
  • SHAFT BALANCING
    LACK OF KEYWAY AND DESIGN OF NUT ENSURES SHAFT IS PERFECTLY BALANCED.

  • SIMPLIFIES ASSEMBLY
    NO TAB WASHER IS REQUIRED REDUCING COSTS AND REMOVING POSSIBILITY OF THE TAB WASHER BEING INCORRECTLY INSTALLED.

  • WEIGHT SAVING
    THINNER WALL HOLLOW SHAFT CAN BE USED COMPARED TO THOSE WHERE A KEYWAY IS REQUIRED THEREBY SAVING WEIGHT.

  • LABOUR SAVING
    MACHINING OF A SHAFT KEYWAY IS ELIMINATED.

  • WORKABILITY
    NO SKILL OR TECHNIQUE IS REQUIRED FOR ASSEMBLY.

  • REUSABLE
    THE FINE U-NUT CAN BE RE-USEABLE.
  • Fine u nut
  • FUNCTIONALITY
    FINE ADJUSTMENTS ARE EASILY ACHIEVED TO OBTAIN OPTIMUM BEARING ASSEMBLY.

  • ECONOMICAL EFFICIENCY
    INVISIBLE COSTS ARE REDUCED AND TOTAL COST REDUCTION IS ACHIEVED.

Twin FU-nut
Construction and function
The TWIN FU-NUT has two friction rings and a spacer which are secured to the upper surface of the nut, as shown above. The two friction rings are arranged so that stress P generated by the spring action and the reaction P' act symmetrically about the shaft centre. This arrangement ensures an even contact force F around the contact face.

Features
Twin FU nut
  • Accuracy of thread is ISO 4H.
  • Excellent locking performance.
  • Bearing surface run out to thread form is held to within a few microns.
  • Simple assembly as for a standard nut.
Durga can import and supply all range of these nuts on placement of orders from the customers.

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