The Solution: the spiralock self locking fastener
successfully survived load and fatigue testing to one-million cycles without loosening or backing out.
Each panel is secured together using a state-of-the-art cam locking fastener
Furthermore, we have many projects under development to solve specific threaded joint applications, including a nut that will free spin onto a bolt and have prevailing torque to prevent it from coming off, a locking fastener
for soft joints (a gasket), and a tamper proof nut.
The Biomet engineers examined a snap-fit-type locking fastener
, but selected a self-locking fastener manufactured by Spiralock Corp.
The current AD requires a one-time inspection of the coupling hinge and locking fastener
of the Gamah couplings of the fuel system tubing located in the wing dry bay to detect discrepancies, and follow on corrective actions.
For instance, Sequa used a counter bore locking fastener
arrangement to secure a several thousand pound flywheel to canning machinery.
The final choice came down to a snap-fit type locking fastener
and the Spiralock thread form.
Most locking fasteners
do not address a basic design problem with the standard 60-degree thread form: that the gap between the crest of the male and female threads can lead to vibration-induced thread loosening.
More specialist adhesives include: a flexible gasket maker for low medium strength bonding; an oil tolerant thread locker to help prevent vibration loosening nuts and bolts, with an alternative high strength adhesive for locking fasteners
; and two thread and pipe fast cure sealants, one offering medium strength break torque and the other a low break strength torque.
At Stolle, many application-specific locking fasteners
in various sizes, materials, thread pitches, and retainer configurations have been specified.