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Fuji Bearing Lock Nuts

eliminate keyways and tab washers

axial impact vibration test

Test Conditions 

Machine - NAS high speed screw loosening tester 

Sample size  M20 x 1.0 
Frequency  21Hz 
Excitation stroke  11mm 
Impact stroke  10mm 
Vibrating acceleration of excitation table         10G 
Test time  60 minutes 
Direction of impact  Bolt axis direction 
Clamping torque  53.9N.m (550kgf.cm) 









Test Results

Sample Nut

Excitation Time (Minutes)

      10           20            30           40           50          60

Test Results

Standard bearing nut with tongued washer



     Δ - x damaged washer (11 minutes)


Nut came off

FUJI Locknut


No effect


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