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Nut, Stop MS21042-4

41 Reviews 4 Answered Questions
Packaged Items
SinglePack of 25
Quantity
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TypePart No.Thread
Dry Hex NutMS21042-41/4-28

Overview

The MS21042 all-metal stop nuts are designed for use in high temp installations (up to 450°F). MS21042 nuts are shorter than the AN363 nut but develop the same tensile strength. MS21042 Hex Nuts (Lubed) are the same as MS21042- but have a dry film lube (dark grey).
   
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Reviews

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The only thing that would work

Chip B Verified Purchase

Nut, Stop MS21042-4 (Pack Of 25)
May 6, 2026

Woodaero Verified Purchase

Nut, Stop MS21042-4 (Pack Of 25)
April 17, 2026

These worked perfect was able to get socket on it in tight location

Kyle Verified Purchase

Nut, Stop MS21042-4
January 12, 2026

Kenneth L Verified Purchase

Nut, Stop MS21042-4
December 19, 2025

Perfect

Tarrant C Verified Purchase

Nut, Stop MS21042-4
November 25, 2025

Thanks

Kelie S Verified Purchase

Nut, Stop MS21042-4
September 17, 2025

ok

Morten M Verified Purchase

Nut, Stop MS21042-4 (Pack Of 25)
August 29, 2025

Great for tight places that need a strong lock nut!

David S Verified Purchase

Nut, Stop MS21042-4
August 26, 2025

Correct as expected thank you

William B Verified Purchase

Nut, Stop MS21042-4
August 8, 2025

cant reuse these so buy a bunch! (needed when replacing brake pads)

Larry S Verified Purchase

Nut, Stop MS21042-4 (Pack Of 25)
July 16, 2025

Q&A

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Please note, Aircraft Spruce ®'s personnel are not certified aircraft mechanics and can only provide general support and ideas, which should not be relied upon or implemented in lieu of consulting an A&P or other qualified technician. Aircraft Spruce ® assumes no responsibility or liability for any issue or problem which may arise from any repair, modification or other work done from this knowledge base. Any product eligibility information provided here is based on general application guides and we recommend always referring to your specific aircraft parts manual, the parts manufacturer or consulting with a qualified mechanic.

Q: Is MS21042-06 cad plated steel?

Yes, these are cad plated steel.

Q: What is the equivalent nut in Stainless Steel?

MS21043-4 (our part number 04-01388.)

Q: What is the reason for choosing a dry or lubed version of these Hex Nuts?

It helps prevent corrosion.

Q: Are these MS21042 ALL-METAL HEX STOP NUTS self locking?

Yes.

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