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MS21042-5 All-Metal Self-Locking Nut | 5/16-24 Aircraft Lock Nut

MS21042-5 All-Metal Self-Locking Nut | 5/16-24 Aircraft Lock Nut

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MS21042-5 All-Metal Self-Locking Nut

The MS21042-5 is an all-metal self-locking aircraft nut, also known as an All-Metal Stop Nut or Self-Locking Nut. It is used in aircraft applications where nylon-insert nuts are not recommended, especially in areas subject to elevated temperatures.

The nut features a 5/16-24 UNJF thread, low-profile design, and all-metal construction, making it shorter than the AN363 nut while maintaining similar locking functionality. The MS21042 family is designed for high-temperature installations, typically up to 450°F, and is manufactured from carbon steel with cadmium plating.

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Why buy from Blackbird Aviation

  • Manufacturer's release with every part. FAA Form 8130-3, EASA Form 1 or the manufacturer's certificate of conformity, exactly as received from the source. Never altered or re-issued.
  • Lot traceability on every shipment. Every order also ships with a Blackbird Certificate of Conformance and lot-split record linking your part to its source certificate, the receipt it arrived under and every quantity released from that lot.
  • Identified and stored under control. Each part is labeled with its part number, lot and certificate reference and kept at a tracked bin location.
  • Stock in the USA and Brazil. Margate, Florida and Cotia, São Paulo.
  • Run by a pilot who flies what we supply. Our founder, Marcus Graciotti, holds FAA and ANAC ATP licenses for airplanes and helicopters and grew up as the son of an aircraft mechanic. Read our story