A positive locking device is a device used in conjunction with a fastener in order to positively lock the

fastener A fastener (US English) or fastening (UK English) is a hardware device that mechanically joins or affixes two or more objects together. In general, fasteners are used to create non-permanent joints; that is, joints that can be removed or disman ...

. This means that the fastener cannot work loose from

vibration Vibration () is a mechanical phenomenon whereby oscillations occur about an equilibrium point. Vibration may be deterministic if the oscillations can be characterised precisely (e.g. the periodic motion of a pendulum), or random if the os ...

s. The following is a list of positive locking devices: *A

split beam nut A split beam nut, also known as a split hex nut. or slotted beam nut, is a locknut A locknut, also known as a lock nut, locking nut, self-locking nut, prevailing torque nut,. stiff nut or elastic stop nut, is a Nut (hardware), nut that resists ...

*A castellated nut and a

split pin A split pin, also known as a cotter pin, or cotter key in the United States of America, US, is a metal fastener with two wiktionary:tine, tines that are bent during installation, similar to a staple (fastener), staple or rivet. Typically made o ...

hex nut A nut is a type of fastener with a screw thread, threaded hole. Nuts are almost always used in conjunction with a mating bolt (fastener), bolt to fasten multiple parts together. The two partners are kept together by a combination of their threads ...

or cap screw and a tab washer *A hex nut or cap screw and a lock plate * Safety wiring with various types of fasteners 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={{sfnref, AC43.13, 1998 Fasteners