TukLoc Blind Fasteners

Blind Fastening System

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. TukLoc is currently available in elliptical head configuration.

Benefits of TukLoc

Process consistency and repeatability
No additional sealants required when wet installed with primer
Rapid installation
Can be easily automated

The TukLoc Tooling System uses a custom pneumatic/hydralic puller unit and PowerPak. As with all of our products, there are variations in the durable tooling. A complete TukLoc system includes (but is not limited to):

Cutting Tools
Mandrel & Mandrel Housing
Threaded Rod
Check Gages (combination & mandrel)
Puller & PowerPak

TukLoc is currently available in elliptical head configuration.

Installation Procedure

TukLoc is installed in the structure by radially expanding the fastener into the hole. This process can be easily used in a number of blind fastening areas and is an excellent replacement for elliptical press nuts and RivNuts. TukLoc's blind fastening system provides consistent and repeatable results and can be easily automated.