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2. Self-locking device - Wikipedia

   en.wikipedia.org/wiki/Self-locking_device

   The Wren Industries 'Silent Partner'. To overcome these limitations, the Wren Industries 'Silent Partner' device was developed. This system has four mechanical moving parts inside a frame that is attached to a climber's sit harness and is basically an inertial drum brake with the belay rope connected to the device by tying a clove hitch around ...

3. Safety wire - Wikipedia

   en.wikipedia.org/wiki/Safety_wire

   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 ...

4. Linchpin - Wikipedia

   en.wikipedia.org/wiki/Linchpin

   The word is first attested in the late fourteenth century and derives from Middle English elements meaning "axletree pin". [1] [2] Securing implements onto the three-point hitch of a tractor is an example of application. Linchpins may also be used in place of an R-clip for securing hitch pins. [3]

5. R-clip - Wikipedia

   en.wikipedia.org/wiki/R-clip

   D: Cross-section of a new split pin An R-clip , also known as an R-pin , R-key , hairpin cotter pin , [ 1 ] hairpin cotter , [ 2 ] bridge pin , [ 2 ] hitch pin clip [ 3 ] [ 4 ] or spring cotter pin , [ 5 ] is a fastener made of a durable but flexible material, commonly hardened metal wire, resembling the shape of the letter "R".

6. Positive locking device - Wikipedia

   en.wikipedia.org/wiki/Positive_locking_device

   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

7. Hook-and-loop fastener - Wikipedia

   en.wikipedia.org/wiki/Hook-and-loop_fastener

   [15] [16] Heavy-duty variants (such as "Dual Lock" or "Duotec") feature mushroom-shaped stems on each face of the fastener, providing an audible snap when the two faces mate. A strong pressure sensitive adhesive bonds each component to its substrate. There is a silent version of hook-and-loop fasteners, sometimes called Quiet Closures.