Junker Test for Lock Nuts: HARDLOCK® Performance Under Transverse Vibration A Junker Test lock nut must prove that it can maintain preload under severe transverse vibration. For engineers working in railway, steel plants, wind power, automotive, bridges and heavy machinery, this test is one of the clearest ways to compare anti-loosening fasteners and select a … Continue reading Junker Test Lock Nut: HARDLOCK® Vibration Proof Nut