self Locking Nuts!

[var10]

Hello,

Does any one know any MS part numbers for "Non-Self locking nuts". There always seems to be only self locking nuts with or without dry film lubricant.

Like now I want MS21075L06, but I was only able to find this with a self locking feature. I would really appreciate if any one knew the number for without the self locking feature in same or similar sizes. Spoken to suppliers, done searches and found nothing.

Thanks,

Varoon

 

[berkshire]

You are asking for a cage or captive nut . It is most unusual to find these without a thread retaining feature, especially in an aircraft.
B.E.

You are judged not by what you know, but by what you can do.

 

[debodine]

I may not be understanding correctly what you are trying to do. We use a lot of MS21075 nuts (locally we call them nut plates) and I am trying to envision where you would ever want a nut plate that did NOT have the self-locking feature? That is probably why I can't come up with an MS spec off the top of my head. Not that they might not exist, but we don't use them here so I can't recall any such spec.

 

[monkeydog]

You can try a NASM14179 "sorta" self locking, but you can pop-out the polymide insert to get rid of the "sorta" self locking feature.

 

[Sparweb]

The MS spec he's asked for is a little #6 screw, so there can't be much load involved. (hope not)
Maybe the OP is using plate-nuts for an application that is frequently opened, so the threaded features degrade over numerous repeated fastening operations.
If that's the case, may I suggest 1/4 turn fasteners for consideration? These are meant for repeated open-close operations though they will wear out in time, too. They are strictly non-structural fasteners, mind you, and may not be appropriate for whatever you are working on.

STF

 

[var10]

Debodine - some products are not airborne and not subjected to vibrations. They need frequent access as well.

monkeydog - NASM14179 first size is 10, but I need 6-32 and 4-40.

Yes Sparweb. It is not a load critical application. The plates are opened very often and it is quite annoying when the self lock feature has no more material to hold it in place. I had a look at few 1/4 turn fasteners.

Two things - 1. It is too big I was looking more about the size of 15mm L x 10mm W x 5mm H.

2. How does it hold to my part? MS21075L06 is riveted to my part and I use the the threads or the locking feature to connect another piece (using 6-32 and 4-40 screws). I do not want to tap directly in my Aluminium part. I would also prefer a floating threaded nut or a threaded nut which is just sitting there and a screw can be used to hold together (not necessarily MS). The hole depths are also different at different locations - with a screw I could just get a long screw and it would work everywhere. How does the stud perform this function. Please do correct me if I am wrong.

Just for this time I can get away without an MS part as what I am doing wont leave our workshop. But still I would like to know if any one have heard about "Non-self" locking features with MS numbers?

Thanks for your responses.

 

[berkshire]

If you really had to have that, you averted your eyes and ran a tap through the standard fitting, ignoring the notices about, not doing it, posted around the walls of the hangar.
B.E.

You are judged not by what you know, but by what you can do.

 

[debodine]

Thanks, var10. I knew I had to be be overlooking something about the need you are trying to fill with your design. Sorry I could not help.

 

[WKTaylor]

Var10...

Virtually all plain nuts have relatively low tensile strength.

NO aerospace nutplates [NP] that I am aware of are available without self-locking capability.

You are also asking for a reduced rivet spacing NP [MS21075 has reduced rivet spacing].

Perhaps what You really need is something like a Rivenut [NAS1329, NAS1330] with free-running threads or a threaded insert [NSL helical coil, etc].

SPS has various nut retainer that might be adapted for Your purpose: sheet metal retainer installs like a nutplate, while "capturing" a standard nut [may not come in small-enough sizes for Your purpose].

http://www.spstech.com/aero/fastenerfinder/browseStyle.jsp?category=PLATENUTS&type=34&style=1

Lug 12PT


Regards, Wil Taylor

Trust - But Verify!

We believe to be true what we prefer to be true.

For those who believe, no proof is required; for those who cannot believe, no proof is possible.

Unfortunately, in science what You 'believe' is irrelevant – "Orion"

 

[ewh]

I remember using MS non-locking nuts decades ago (non-aerospace), but am unsure if any were smaller than #10. I believe most if not all of those specs have been superceded or cancelled. I will try to check my old binders when I can get into my garage this weekend.

“Know the rules well, so you can break them effectively.”
-Dalai Lama XIV

 

[WKTaylor]

ewh...

Non-locking hex nuts are few... but available [AN310, AN315, AN316, AN320, NAS509, etc].

Var10 is looking for NUTPLATES that are NSL.

I think he is best-off looking at quick-turn structural panel fasteners.

Regards, Wil Taylor

Trust - But Verify!

We believe to be true what we prefer to be true.

For those who believe, no proof is required; for those who cannot believe, no proof is possible.

Unfortunately, in science what You 'believe' is irrelevant – "Orion"

 

[WKTaylor]

I just noticed: MS21075L06 has coarse threads [.1380-32 UNJC-3B].

Regards, Wil Taylor

Trust - But Verify!

We believe to be true what we prefer to be true.

For those who believe, no proof is required; for those who cannot believe, no proof is possible.

Unfortunately, in science what You 'believe' is irrelevant – "Orion"

 

[var10]

Thanks for your responses, appreciate it. I am looking into insertnuts (rivenuts), the only problem being the space. Also thought about clinch nuts. Other than aerospace do any other industries use nut plates or floating anchor nuts?

Reason behind why I didn't want to use helicoil was it will consume more time installing them than when they are in action and each part in average has around 8 holes. So labour will make it less worth.

 

[berkshire]

var10 (Mechanical)
[highlight #EF2929]Other than aerospace do any industries use nut plates or floating anchor nuts[/highlight]

Ok here are a few and you are most likely to be in one of them, Electronics, cabinet and chassis industry. Automobile industry, Food packaging industry, medical device industry, oilfield industry, In fact just about any industry that has a need to quickly remove an access panel or component from a non machined component , then replace it just as quickly.
B.E.

You are judged not by what you know, but by what you can do.

 

[Sparweb]

Just throwing out some names, so you'll have to do the google legwork yourself:
Dzus
Camloc
Southco
Airloc
PEM
Clickbond

...There really is a big big world out there when you start looking for specialty fasteners. Good hunting!


STF

 

[hamblin100]

Not knowing the design requirements it seems that the access required is through a nonstructureal panel. Have you considered a cam lock type application instead?