FUJI BEARING LOCKNUTS Rotational Life Test
eliminate keyways and tab washers
General Information
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Fuji Locknuts ROTATIONAL LIFE TEST
Test Conditions
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| Sample size | Â | M55 x 2.0 |
| Speed of revolution | Â | 2,300rpm |
| Testing cycles |  | One cycle (forward rotation, stop, reverse rotation, stop): 10 seconds |
| Stopping time |  | One forward rotation: 0.30 seconds. For reverse rotation: 0.27 seconds |
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Internal force applied to the nut during stopping | ||
Sample Nut | Inertial Force : N.m (kgf.cm) | |
For forward rotation | For reverse rotation | |
Standard Bearing Nut | 0.14 (1.42) | 0.15 (1.57) |
FUJI Locknut | 0.15 (1.52) | 0.17 (1.69) |
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RESULTS | ||
Sample Nut | Sample No | Result on endurance text |
Standard Bearing Nut & Washer | 1 | Washer damaged & nut came off at approx. 110,000 cycles |
2 | Washer damaged & nut came off at approx. 330,000 cycles | |
FUJI Locknut | 3 | No change after 500,000 cycles |
4 | ||
An interesting point to note is the difference in failure times between the two lock washers caused by inconsistent assembly. This is avoided by using the FUJI Locknut.
| External view of testing machine |  | External view of damaged & detached washers (sample No 2) |
