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Procedure and Results

  • Hardlock Industry, lead manufacturer of self-locking nuts
  • Technical Information
  • Procedure and Results

Junker testJunker-style Fastener Looseness Test

Reuse testReuse Test

Test of Preload Variance Due to TighteningTest of Preload Variance Due to Tightening

NAS testNAS test

Loosening testLoosening under Transverse Cyclic Loads

  • Products

    • HLN Hardlock Nut
    • HLB Hardlock Bearing Nut
    • HLS Hardlock Set Screw
    • Warning about Imitation Products
  • Technical Information

    • Why Do Fasteners Become Loose?
    • Why the Hardlock Nut Does Not Loosen
    • Testing Apparatus
    • Test Data
    • Articles, Technical Papers
  • Applications

  • About Us

    • Company Outline
    • Corporate Vision
    • Quality Initiatives
    • Locations
    • History
    • News
    • Contact us
    • Privacy Policy
    • Product brochure downloads
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