Positive locking device

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title: "Positive locking device" type: doc version: 1 created: 2026-02-28 author: "Wikipedia contributors" status: active scope: public tags: ["fasteners"] topic_path: "general/fasteners" source: "https://en.wikipedia.org/wiki/Positive_locking_device" license: "CC BY-SA 4.0" wikipedia_page_id: 0 wikipedia_revision_id: 0

::figure[src="https://upload.wikimedia.org/wikipedia/commons/1/15/Car_hub_cotter_pin.jpg" caption="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:

  • A split beam nut
  • A castellated nut and a split pin
  • A hex nut or cap screw and a tab washer
  • A hex nut or cap screw and a lock plate
  • Safety wiring with various types of fasteners ::quote[attribution="nut]], [[Bolt (fastener)"] 7-122. GENERAL. The word safetying is a term universally used in the aircraft industry. Briefly, safetying is defined as: "Securing by various means any [[Nut (hardware) ::

::quote

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File:Nut lock plate.svg|A locking plate File:Nut tab washer.svg|A tab washer

References

  • {{cite book |url=http://www.faa.gov/regulations_policies/advisory_circulars/index.cfm/go/document.information/documentid/99861 |title=AC 43.13-1B - Acceptable Methods, Techniques, and Practices - Aircraft Inspection and Repair |chapter=7. Aircraft Hardware, Control Cables, and Turnbuckles |chapter-url=http://rgl.faa.gov/Regulatory_and_Guidance_Library/rgAdvisoryCircular.nsf/list/AC%2043.13-1B/$FILE/Chapter%2007.pdf |date=8 September 1998 |access-date=2012-12-11 |ref=

References

  1. Timings, Roger Leslie. (2005). "Newnes Mechanical Engineer's Pocket Book". Newnes.

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fasteners