Packaged Items
SinglePack of 25
DescriptionPart NumberThread SizePackage Quantity
365-524 SS STOP NUT04-015085/16-2425


Stainless Steel Stop Nut
California Prop 65 Warning Symbol

WARNING: Cancer and Reproductive Harm -


Great little nut.

Morris M
June 14, 2021

Common high grade commercial fastener.

Gari M
May 6, 2019

Obviously, except for being made of corrosion resistant steel as opposed to whatever grade the cad plated ones are made of, these commercial grade nuts appear to be identical to the AN version. I understand that it is not good practice to use stainless nuts with stainless bolts, but since I rarely install stainless bolts I think Ill start using more stainless stop nuts where appropriate

Robin O
August 24, 2018

Quality commercial grade SS stop nuts. Aircraft Spruce beats the pricing of local home improvement and hardware stores, hands down!

Mike S
June 21, 2018

Great project part for student projects.

Ed B
October 16, 2017

Right size for project. Fast shipping

Ed B
August 11, 2017

A little confusion with the order, but it all got done eventually,

Jeff A
August 26, 2019

Learned that stainless steel bolts are NOT compatible with stainless steel elastic nuts... beats me as to why not but this you tube explains alot.

Lind E
December 22, 2021

requested all steel stop nuts. received nylok type (which is the number in the Cessna parts book.

Kent G
February 8, 2020

absolutely do not use these nuts with stainless steel bolts... the nylon is so tite that they lock up as the bolt goes through it/ the result is literally breaking the bolt to get it off the nut. ended up taking a large amount of time to get them off

Lind E
December 22, 2021


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: What grade of stainless steel are these stop nuts?

These are made from 18-8 stainless steel.

Q: whats the difference between the 364-440 and 365-440 nuts??

365 are standard. 364 are low profile.

Q: What is the difference between 04-01502 (which is a 364-632 SS low profile) and a MS21083C06 Low profile Nyloc)...I see one is called commercial and one that the only difference?...I have both the commercial which has white Nyloc and the MS21083C06 has green Nyloc.

The commercial hardware does not have certs, other than that they are basically the same.

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