AS/EN/JISQ9100 REV B and ISO 9001:2008 Registered Company www.spiralock.com An effective, proven and reliable solution to prevent threaded joint loosening problems
Spiralock Corporation has re-engineered the standard (female) internal thread form and added a 30° wedge ramp at the root of the thread. Through this unique design, Spiralock® thread form is exceptionally resistant to thread loosening and stripping, caused by transverse vibration. Eliminating the need for secondary locking devices, Spiralock provides reliable fastening solutions for applications in a wide range of industries, including aerospace, military, automotive, truck, diesel and IC engines, medical, oil/gas and power generation, farm and construction and others.
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1. AS/EN/JISQ9100 REV B and ISO 9001:2008 Registered Company
www.spiralock.com An effective, proven and reliable solution to
prevent threaded joint loosening problems
2. Copyright Notice
This presentation is a property of
Spiralock Corporation .
Reproduction, distribution, display
and use of the presentation without
the written permission from Spiralock is strictly
prohibited.
Spiralock Corporation Management
3. 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.
4.
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
5. 60 Thread
Male thread crest engagement in helical fashion
Compatible with 2A & 3A, and 4g6g (metric) external
threads
Prevents vibration-induced movement
Spiralock
Significant radial clearance designed in
Contributes to thread fit variations
Primary reason vibration loosening can occur
Thread Tolerances CLEARANCE
6. 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
None of these fixes address the root cause of loosening!
Primarily a fail-safe to hold the hardware after loss of
tension
Spiralock modifies basic joint behavior instead of relying on
thread friction
7. Vibration Loosening
Junkers Test
Cam driven transverse movement
Most severe condition to accelerate self-loosening
Treats fastener like it is undersized for application
Contact Pressure Variation Rotation of the Nut Bending Moment
Micro-Slip Between Threads External Load
8. Junkers Vibration Test
Test Parameters: -28 nuts, 20 Hz vibration, 0.033
amplitude
Source: Kaynar Corporation
9. 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
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.
Taps - Cutting & Forming
Spiralock Product Selection
Thread Turning
Thread Milling
Hex flange nuts
Wire thread inserts
Self-clinching nuts
Molded & ultrasonic inserts
Made-to-order fasteners
Three Part Gauging System
Checks Pitch Diameter & Thread Geometry
12. Industries served Medical Aerospace Automotive Oil, Gas
& Power Generation Heavy Truck Farm/Construction Equipment
Diesel & IC Engines Military
