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NUT, STOP MS21042-08

Packaged Items
SinglePack of 25
TypePart No.Thread
Dry Hex NutMS21042-088-32


The MS21042 all-metal stop nuts are designed for use in high temp installations (up to 450F). 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).

Less 20% for quantity 100/Part No.
California Prop 65 Warning Symbol

WARNING: Cancer and Reproductive Harm -


as described

Roger P Verified Purchase

NUT, STOP MS21042-08 (PACK OF 25)

May 2, 2024

Afelio S Verified Purchase

NUT, STOP MS21042-08 (PACK OF 25)

January 24, 2023

As advertised MS stop nut on easy to navigate website.

Patrick C Verified Purchase

NUT, STOP MS21042-08

January 21, 2022

Order shipped promptly, sales person very polite

Charles M
April 20, 2021

Great nut for small tight places and firewall forward where heat is an issue.

Lewis M
September 23, 2020

Use these on my race car to reduce weight and ensure a secure fit.

March 19, 2020

Highest quality, provides a light weight low profile locking fitting. Great for high heat applications.

February 29, 2020

Frederick C
November 11, 2019

As described. Recommended.

Ronald G
July 11, 2019

Michael D
February 28, 2019


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?


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