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MS21042-3 All-Metal Self-Locking Nut
The MS21042-3 is an all-metal self-locking aircraft nut, also known as a Stop Nut or Extended Washer Nut. It is used in aircraft fastening applications where mechanical locking is required without nylon inserts.
The MS21042 family is designed for high-temperature applications, with typical operating temperatures up to 450°F, and features steel construction with cadmium plating. The MS21042 specification has been superseded by NASM21042, so equivalency should be validated according to applicable documentation.
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
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