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

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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