Search Results

The installation of common threaded aerospace fasteners by the application of a torque to a nut or collar is made possible by an internal wrenching element or recess feature adapted to the threaded end of a pin, which accepts a mating anti-rotation key designed to partially balance the applied torque. In applications such as the mechanical joining of composite structures accomplished by wet clearance fit installations of permanent fasteners, high nut or collar seating torques not adequately opposed by frictional resistance at the contact surfaces of the fastener and joint members effectively shift a greater proportion of the torque reaction requirement onto the recess and mating anti-rotation key which in turn can experience high torsional stresses exceeding their design capability and result in frequent service failures.

A new vibration resistant collar has been developed by Huck International. This collar is suitable to be used with all pins in standard threads such as Aero-Lite manufactured by Huck or other similar products available on the market. The unique feature of this product is its capability to remain free running until it meets the sheet line. Therefore, a user can install it to finger tight, set up the whole assembly, and finish the installation with a standard torque controlled collar runner or with collar runner without torque control, depending on the user's preference with the use of corresponding type of collars. The lock will develop during installation and sufficient clamp force and tensile strength are also developed in the process. A solid round lock is developed in this collar. The developed clamp force and tensile strength is comparable to collars used in similar applications at present.