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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.
The annular snap-fit utilizes a hoop-strain to hold into place. Hoop-strain is the expansion of the circumference of the more elastic piece as it is pushed onto the more rigid piece. In most cases the design is circular. Some popular examples are pen caps, ball and socket joints, snap fasteners and some water bottle caps.
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
Locking pliers (also called Vise-Grips, Mole wrench or Mole grips) are pliers that can be locked into position, using an "over-center" cam action. Locking pliers are available with many different jaw styles, such as needle-nose pliers, wrenches, clamps and various shapes to fix metal parts for welding.
The self-locking property is also key to the screw's use in a wide range of other applications, such as the corkscrew, screw top container lid, threaded pipe joint, vise, C-clamp, and screw jack. Screws are also used as linkages in machines to transfer power, in the worm gear, lead screw, ball screw, and roller screw.
Clamp-style shaft collars are designed to solve the problems associated with the set-screw collar. They come in one- and two-piece designs. Instead of protruding into the shaft, the screws act to compress the collar and lock it into place. The connection between the shaft and the collar is made with friction.