The Huck-brand Bobtail lockbolt from Alcoa Fastening System, Waco, Tex. (www.alcoa.com/fastening_systems), is said to provide the highest vibration resistance and fatigue strength of all fasteners in its class. The Bobtail’s collar is pressed onto the hardened threads of the lockbolt and forced into the grooves of the pin — forming a permanent connection. Unlike conventional threaded fasteners, this swaging technique ensures full metal-to-metal contact between the collar and lockbolt. The Bobtail’s shallow thread and large root radius give it 5 to 10 times the fatigue strength of conventional nuts and bolts. Installation using Huck’s tooling can be done in 2 sec with high, consistent clamp loads. The installation tool can also remove lockbolts. The Bobtail is available in Grades 2, 5, and 8 in a variety of standard and metric sizes.

Edited by Stephen J. Mraz