how to solve fastening problems
TRANSCRIPT
AS9100 REV B and ISO 9001:2000 Registered
““Your Fastening Solutions Your Fastening Solutions Company”Company”
a division of
Spiralock TechnologySpiralock Technology
What is Spiralock?
A self-locking female thread form with a 30o
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.
Mates with standard male threadFaster to assemble, reduced operator fatigue
Free spinningWedge tightens as clamp load builds
ReusableNo deterioration of lock feature
Self-centering of male fastener Pushed inward from all sides
Radial load distributionLowers chance of shear failure
Improved fatigue lifeLoad carried across all threads
Resistant to vibration looseningEliminates radial clearance - no transverse motion
Resistant to gallingReduced surface contact minimizes galling
Features of SpiralockFeatures of Spiralock
6060° ° ThreadThread Line contact with Spiralock levels out surface finish issues during tightening
SpiralockSpiralock High spots on rough surfaces yield and creep, causing loss of clamp load
Common 60Common 60°° Thread Limitation: Thread Limitation: Surface RoughnessSurface Roughness
6060° ° ThreadThread Male thread engages with Spiralock wedge ramp, avoiding plating buildup in thread root
SpiralockSpiralock Plating buildup causes mis-loading of flanks and lowers tension component of joint
Common 60Common 60°° Thread Limitation: Thread Limitation: Plating BuildupPlating Buildup
6060° ° ThreadThread Line contact with Spiralock
eliminates flank angle issue
SpiralockSpiralock Geometric irregularities
cause non-uniform flank contact and stresses
Common 60Common 60°° Thread Limitation: Thread Limitation: Angle ErrorAngle Error
6060° ° ThreadThread Male thread crest engagement in helical fashion Compatible with 2A & 3A, and 4g6g (metric) external threads Prevents vibration-induced movement
SpiralockSpiralock Significant radial clearance designed in Contributes to thread fit variations Primary reason vibration
loosening can occur
Thread TolerancesThread Tolerances
CLEARANCE
60° Threaded Joint Band-Aids60° 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
All Metal PT Nut
Junkers Vibration TestJunkers Vibration Test
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
Thread Stress DistributionThread Stress Distribution
Spiralock Thread
Standard 60° Thread
Direction of TensionDirection of Tension
Source: Kaynar Corporation
Radial thread loading distributes stress, improves fatigue life
Stress concentrated on first engaged thread
Source: Al Harral
Finite Element AnalysisFinite Element Analysis
Spiralock:Stress distributedover all engaged
threads
60° Thread:Stress concentratedin first few threads
Source: Al Harral
Axial Load vs. Radial LoadAxial Load vs. Radial Load
Spiralock thread has3 times the radial
locking load
Qualification ConsiderationsQualification Considerations
Vibration loosening Fatigue failures Joint Joint tension Thermal cycling Embedment / joint relaxation Tightening method (initial & field service) Galling Thread engagement Corrosion resistance
The Spiralock SystemThe Spiralock System
CustomerG
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Global Customer Service
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Fastener applications for hard joints, or Threaded hole applications using Spiralock taps, thread turning
and thread milling cutters
ControlledPrecision
Thread Gages
ControlledPrecision
Threading Tools
Defined, Tested,ControlledFasteners
Applying Spiralock:
Spiralock Fastener SelectionSpiralock Fastener Selection
Self-clinching nuts Molded & ultrasonic inserts Made-to-order fasteners
Hex flange nuts Wire thread inserts
Tapping - Cut & Forming
Threading Holes with Spiralock Threading Holes with Spiralock ToolsTools
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.
Checking Threads with Spiralock Gages
Three Part Gauging System Checks Pitch Diameter & Thread Geometry
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 Available Spiralock Test StudiesStudies