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Crow's foot adapters, sometimes called crowfoot adapters, feature an open end similar to a spanner along with a square hole for a ratchet or breaker bar. They are used to reach otherwise inaccessible fastenings or to hold a tensioning nut at a specific torque whilst allowing access to a locking nut that would be inaccessible with a standard socket.
The cow hitch, also called the lark's head, is a hitch knot used to attach a rope to an object. The cow hitch comprises a pair of single hitches tied in opposing directions, as compared to the clove hitch in which the single hitches are tied in the same direction.
A Chicago fitting (also called a Duck's foot fitting due to its shape) is a one quarter turn fitting used for attaching hoses or piping together. Chicago's fittings are used on both low to medium pressure gas and fluid lines. [1]
A form-fit, form-locking or form-closed connection is a type of mechanical connection between two parts (example: screw and screwdriver), wherein these parts due to their forms interlock and block each other along at least one defined linear or rotational direction. [1] [2] [3] [4]
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 split beam nut; A castellated nut and a split pin; A hex nut or cap screw and a tab washer
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