Turnlock Fasteners

A turnlock fastener is a type of fastener used to secure inspection plates, doors, and other removable panels on an aircraft. Also known as quick-opening, quick-action, and stressed panel fasteners, they are noted for their quick and easy removability for inspection and servicing purposes. The most common types of turnlock fasteners are Dzus, Camloc, and Airloc. In this blog, we will discuss all three and their unique characteristics.

Dzus turnlock fasteners comprise a stud, grommet, and receptacle. The grommet is made from aluminum or a type of aluminum alloy metal and acts as a holding device for the stud. The spring is made from steel and is cadmium plated to prevent corrosion. The spring supplies the force that locks or secures the stud in place when two assemblies are joined. The studs are made from steel and come in three head styles: wing, flush, and oval. The Dzus fastener’s body diameter, length, and head type may be identified by markings on the head of the stud. The fastener is locked by a quarter turn of the stud (clockwise) and can be unlocked by turning the stud counterclockwise. Dzus fasteners can also be unlocked by a Dzus key or specially fashioned screwdriver.
Camloc fasteners come in a wide range of styles and designs. They are used to secure aircraft cowlings and fairings. A camloc fastener consists of three parts: a stud assembly, a grommet, and a receptacle. Two types of camloc fasteners exist: rigid and floating. The stud and grommet are installed in the removable portion and the receptacle is riveted to the structure of the aircraft. The stud and grommet are installed in a plain, dimpled, countersunk, or counterbored hole, depending on the location of the fastener and the thickness of the material it is being attached to. Similar to a Dzus fastener, a quarter turn of the stud clockwise locks the fastener and doing the same counterclockwise will unlock it.
Airloc fasteners consist of three parts: a stud, cross pin, and stud receptacle. The studs are manufactured from steel and case hardened to prevent excessive wear. They also feature a stud hole for a press fit of the cross pin. Before the correct length of stud can be selected, the total amount of material thickness to be secured must be known. Similar to Dzus fasteners, the studs are available in three head styles: wing, flush, and oval. The cross pin is made from chrome-vanadium steel and heat treated to provide maximum strength, wear, and holding power. The cross pin should never be reused. Once it is removed from the stud, it should be replaced with a new pin. The airloc receptacle is manufactured in two types, rigid and floating, and is made from materials such as carbon and heat treated steel.


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