How to Solve Fastening Problems

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  • Spiralock Corporation began as Detroit Tool Industries. We have always served the market as a designer and manufacturer of innovative, ultra precision threading tools, taps, thread milling cutters and thread rolls. In the mid ’90s the company changed its name to Spiralock Corporation to focus exclusively on the Spiralock thread form, solving threaded joint problems for our customers.


  • 1. AS9100 REV B and ISO 9001:2000 Registered “ Your Fastening Solutions Company” a division of
  • 2. Spiralock Technology What is Spiralock? A self-locking female thread form with a 30 o wedge ramp at the root of the thread The wedge ramp allows the bolt to spin freely until clamp load is applied. At that point, the crests of the standard male thread are drawn tightly against the wedge ramp, creating a continuous spiral line of contact along the entire length of the thread engagement.
  • 3.
    • Mates with standard male thread
      • Faster to assemble, reduced operator fatigue
    • Free spinning
      • Wedge tightens as clamp load builds
    • Reusable
      • No deterioration of lock feature
    • Self-centering of male fastener
      • Pushed inward from all sides
    • Radial load distribution
      • Lowers chance of shear failure
    • Improved fatigue life
      • Load carried across all threads
    • Resistant to vibration loosening
      • Eliminates radial clearance - no transverse motion
    • Resistant to galling
      • Reduced surface contact minimizes galling
    Features of Spiralock
  • 4. 60 ° Thread
    • Line contact with Spiralock levels out surface finish issues during tightening
    • High spots on rough surfaces yield and creep, causing loss of clamp load
    Common 60 ° Thread Limitation: Surface Roughness
  • 5. 60 ° Thread
    • Male thread engages with Spiralock wedge ramp, avoiding plating buildup in thread root
    • Plating buildup causes mis-loading of flanks and lowers tension component of joint
    Common 60 ° Thread Limitation: Plating Buildup
  • 6. 60 ° Thread
    • Line contact with Spiralock eliminates flank angle issue
    • Geometric irregularities cause non-uniform flank contact and stresses
    Common 60 ° Thread Limitation: Angle Error
  • 7. 60 ° Thread
    • Male thread crest engagement in helical fashion
    • Compatible with 2A & 3A, and 4g6g (metric) external threads
    • Prevents vibration-induced movement
    • Significant radial clearance designed in
    • Contributes to thread fit variations
    • Primary reason vibration loosening can occur
    Thread Tolerances CLEARANCE
  • 8. 60° Threaded Joint Band-Aids
    • Adhesive
    • Patch bolt
    • Lock washers
    • Disk lock - wedge type
    • Serrations
    • Jam nuts
    • Lockwire
    • Cotter pin
    • Tab lock
    • Prevailing torque
      • All metal
      • Nylon ring
      • Interference fit
  • 9. Junkers Vibration Test All Metal PT Nut
    • Test Parameters: ¼”-28 nuts, 20 Hz vibration, ±0.033” amplitude
    Source: Kaynar Corporation Spiralock retains clamp load Free-running nuts lose all tension Locknuts succumb to vibration loosening
  • 10. Thread Stress Distribution Spiralock Thread Standard 60° Thread Direction of Tension Source: Kaynar Corporation
    • Radial thread loading distributes stress, improves fatigue life
    • Stress concentrated on first engaged thread
  • 11. Finite Element Analysis Source: Al Harral Spiralock: Stress distributed over all engaged threads 60 ° Thread: Stress concentrated in first few threads
  • 12. Axial Load vs. Radial Load Source: Al Harral Spiralock thread has 3 times the radial locking load
  • 13. Qualification Considerations
    • Vibration loosening
    • Fatigue failures
    • Joint tension
    • Thermal cycling
    • Embedment / joint relaxation
    • Tightening method (initial & field service)
    • Galling
    • Thread engagement
    • Corrosion resistance
  • 14. The Spiralock System Global Commercial & Logistical Support Global Customer Service Global Design & Technical Expertise
    • Fastener applications for hard joints, or
    • Threaded hole applications using Spiralock taps, thread turning and thread milling cutters
    Controlled Precision Thread Gages Controlled Precision Threading Tools Defined, Tested, Controlled Fasteners Applying Spiralock: Customer
  • 15. Spiralock Fastener Selection
    • Self-clinching nuts
    • Molded & ultrasonic inserts
    • Made-to-order fasteners
    • Hex flange nuts
    • Wire thread inserts
  • 16.
    • Tapping - Cut & Forming
    Threading Holes with Spiralock Tools
    • Thread Turning
    • Thread Milling
    The purchaser of Spiralock® tools shall have the right to use Spiralock® tools to thread blind and through holes in all elements other than "Fasteners", which are defined to mean discrete male and female threaded elements, the primary purpose of which is to engage or accept a complimentary threaded element. If your application requires a Spiralock ® Fastener, Spiralock Corporation offers a full line of Spiralock fasteners to meet your needs.
  • 17. Checking Threads with Spiralock Gages
    • Three Part Gauging System
    • Checks Pitch Diameter & Thread Geometry
  • 18.
    • Dynamic & Static Testing Goddard Space Flight Center
    • Finite Element Analysis Lawrence Livermore National Laboratory
    • Vibration Resistance & Stress Distribution Massachusetts Institute of Technology for Chrysler Corporation
    • Vibration Testing of Spiralock Wire Thread Inserts British Aerospace, Naval Warfare Division
    Available Spiralock Test Studies