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Nuts and bolt heads are also produced in 12-point double hexagon shapes and various types of splines, more common to aircraft and aerospace applications. When working with common 6-point hexagonal fasteners, the 12-point shaped socket offers double the number of starting points or possible positions by which to put the socket on the nut, and so ...
The nut/pin must be checked before the flight, even though real-world examples of the Jesus nut/pin failing are rare. For example, in 2000, the mast nut of a Bell 206B was removed to be repainted and was not restored and checked prior to a test flight. The helicopter crashed within ten minutes of takeoff, killing the two occupants.
A 12-point screw drive uses two overlapped hexagon shapes, one rotated by 30°. Standard 12-point hex socket bits and wrenches fit these screws. The screw heads are typically flanged, and may fit into standard Allen hex socket cap screw counterbores molded or machined into parts to be fastened.
A wheel hub with a castellated nut secured in the center using a cotter pin to prevent it from unscrewing. A positive locking device is a device used in conjunction with a fastener in order to positively lock the fastener. This means that the fastener cannot work loose from vibrations. The following is a list of positive locking devices: [1] A ...
An F-14 Tomcat with a commanding officer's modex of 101 on the nose, fin tip, and the top of the flaps. A C-1 Trader displaying 000 (aka "triple nuts") on the nose.. A modex is a number that is part of the Aircraft Visual Identification System, along with the aircraft's tail code.
A safety wire is used to ensure proper security for a fastener. The wire needed is long enough to reach from a fixed location to a hole in the removable fastener, such as a pin — a clevis fastener, sometimes a linchpin or hitch-pin through a clevis yoke for instance — and the wire pulled back upon itself, parallel to its other end, then twisted, a single end inserted through a fastener ...