Reliability

Nissei Vibration Bolt Loosening Testing

Laboratory tests have proven that vibration cannot shake the PLB loose, and that the PLB stays tight and completely intact under acceleration of up to 20Gs.  Vibration loosening tests were performed by the Japan Quality Association (JQA) on single threaded bolts (both single and double nut structure) and the PLB.  The test consisted of 30,000 oscillations, or about 17 continuous minutes of vibration, or when the fastener obviously loosened, whichever came first.  Single threaded bolts shook loose in less than one minute while the PLB stayed fastened, even when the test was extended for an additional 10 hours!  Not only did the fastening torque show no decrease in strength, but the PLB also performed flawlessly without any physical damage to the bolt.