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2. 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

3. Washer (hardware) - Wikipedia

   en.wikipedia.org/wiki/Washer_(hardware)

   Tab washer A locking washer that works by having a side tab that can be bent into place against a nut. Metallic or non-metallic, the tab washer notch prevents rotation relative to the shaft or fastener. Variations include single, multiple, formed and flat. [18] Wedge lock washer

4. 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 ...

5. Bolted joint - Wikipedia

   en.wikipedia.org/wiki/Bolted_joint

   Some portion of the nut deforms elastically during tightening to provide a locking action. Spring washers and lock washers A washer that bends axially during tightening. Spring washers create additional axial force whereas lock washers have parts that engage the surfaces in a way to provide more direct resistance against rotation.

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7. List of DIN standards - Wikipedia

   en.wikipedia.org/wiki/List_of_DIN_standards

   Product grade A washers – with a hardness up to 300 HV designed for use with hexagon head bolts and nuts: Withdrawn: DIN EN ISO 7089, DIN EN ISO 7090: ISO 7089, ISO 7090: DIN 126: Product grade C washers – designed for use with hexagon head bolts and nut: Withdrawn: DIN EN ISO 7091: ISO 7091: DIN 127: Spring lock washers with square ends or ...