Proprietary
SLEEVbolt®
The SLEEVbolt® is a two piece assembly used in either interference fit applications where fatigue enhancement is required or as a hole fill fastener in composite type applications. The SLEEVbolt® consists of a tapered bolt and an internally tapered flanged outer sleeve, ground straight externally for use in straight-sided clearance holes. Interference fit, in proportion to the bolt protrusion from the sleeve, is realized as the bolt head comes in contact with the structure.
Several aircraft that currently use the SLEEVbolt® Fastening System include the Military with the F-22, F/A-18, C-17, B-1, B-2 and Commercial aircraft such as 787, 747, 767 and even NASA's Space Shuttle.
Taper-Lok®
The Taper-Lok® is an integrated fastening system which is used specifically for interference fit applications. It's comprised of a tapered, conical-shank fastener, installed into a precision tapered hole. The static preload, radial compression, and peripheral tension, induced by the interference fit effectively reduces stress amplitude to proportionately enhance fatigue life.
Taper-Lok® has been around for over 40 years and has been used on such aircraft as the Military's B-1, B-52, C-130, C-141, and Commercial Aircraft such as 707, 727, DC-10, MD-11, Airbus Aircraft and more.