MS21043-3 HEX NUT

Packaged Items
SinglePack of 10
DescriptionThread SizePart Number
MS21043-3 HEX NUT10-3204-01387


MS21043 Hex Nut, often referred to as jet nuts or reduced hex nuts.

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

WARNING: Cancer and Reproductive Harm -


Great light weight high temp nuts that are same strength as a nyloc nut but less than half the weight.

Dave W
May 7, 2021

I was wrong, stainless steel nut

Mcs R
January 2, 2020

these are alloy/aluminum or something.... I ordered bunch of the wrong ones like this, expected steel..... Hope this helps someone

Mcs R
January 2, 2020


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 would be the best suitable screw for MS21043-3 nut?

This specific nut will have a 10-32 threads. The screw you choose will depend on your application. To use MS21043-3 the screw or bolt will just need to have 10-32 threads.

Q: Are these nuts stainless steel? They look to be, the way they are portrayed in the photo but they are not noted as such.

Yes they are Stainless steel. Alloy 660.

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