TukLoc, the first mechanically attached blind fastening
system for use in primary and
secondary structures utilizes a blind nut that is installed
into the aircraft structure using FTI's state of the art
cold expansion process. TukLoc is installed in the structure
by radially expanding the fastener into the hole. This
expansion creates an interference fit that is resistant
to torque and pushout that also meets or exceeds the NASM25027
specification.
The expansion process locks the fastener
into the structure and then common aerospace screws
are installed to finish the fastened joint. The unique
tooling utilized by this fastening system provides the
first blind fastener that incorporates the benefits
of Fatigue Technology's proprietary cold expansion systems
to provide resistance to fatigue cracking. TukLoc™
is available in two versions non-sealed or sealed applications
such as fuel tanks.
The mechanical expansion provides
a secure, permanent sealing in applications where sealing
is required. Unlike competitive products, the nut is
installed without the need for machining complex elliptical
countersinks or the need for special surface preparation.
• Straightforward hole prep -- no elliptical countersink
or stringent surface prep requirements
• Process consistency and repeatability
• No additional sealants required
• Rapid installation
• Can be easily automated
• Fuel sealed joints (wing skin attachment)
• Fatigue critical joints
• "Blind" repairs
• Replacement of elliptical press nuts and RivNuts
Step 1. Use the air motor to thread the nut on
to the threaded rod until the rod contacts the thread
locking crimp
Step 2.Insert the nut
into the starting hole. May be wet installed with primer
if necessary.
Step 3. With the puller
in hydraulic mode, activate the trigger to push the mandrel
into the nut and simultaneously collapse the back of the
nut body firmly locking the nut into the hole.
Step 4. Thread out the
outer nose cap forward (clockwise) until it contacts the
parent material. Retract the mandrel by holding the bottom
(retract) trigger as shown.
Step 5. In air motor
mode, unthread the puller from the nut.
The TukLoc tooling system uses a custom pneumatic/hydraulic
puller unit and PowerPak . There are also variations in
the mandrels and durable tooling.
The TukLoc tooling system includes:
Cutting Tools
Mandrel
Mandrel Housing
Threaded Rod
Combination Gage Mandrel Gage
Puller
Power Pack
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