What is it called

I am looking for a specific type of nut. M8 and m10 thread.

I want it to slide into a hole to become a semi captive nut for a bolt to drop into.

So it is standwrd thread on inside, but smooth round outside. Like a conventional tube nut, but the other way round (thread on inside).

What are they called? Only need about 20 of each but struggling to find any. Had some from a while ago and used them all and cant remember what they are called or where to get them.

Please ?

 

Pretty damn close thanks.

I don't need them splined, smooth would be ideal, but thats the type.

Thank you

 

Now, what about the same thing, but not threaded, so just a sleeve with a collar ?

 

Thats pretty much the things, thanks.

It is a metal square section frame that I am building and bolting together, but I dont want any nuts sticking out, so dropping 1 of those nuts into a hole allows it to be bolted together neatly.

Thanks for all the input and suggestions though.

 

Why do you say that? That site was out of stock, but led me to some.

What am I missing?

The method I use, is to drill a hole to the size required and push 1in, hold it into place and tighten bolt up to secure.

Not sure of the need for rivnut gun

 

Its ok, I understand that.

I dont need mine fully captive though.

They would normally be used for bolting into from the inserted side. I am using them to bolt into from behind so they be semi captive and work as needed.

Although making them permanently fixed wouldn't hurt, it's not essential in my case.

But might get a gun anyway.

Thanks

 

Tight enough for what i need though.

It is a semi rigid structure, no strength needed, just the ability to join frames together and remove as needed and dismantle when finished etc.

If you imagine a temporary barrier type system, used to display artwork and adverts etc, able to be made to be any shape (right angled or straight only), and can be taken down and stored easy, and only takes minutes to build or dismantle. All made from thin wall square section and round tubes. All bolted and collapsible for minimal storage space.

Very unusual requirement, but a system I made and does what is needed, and not stupidly expensive.

 

Thanks. I know them as spire nuts.

But with the rivnut thing mounted inside the square section there is nothing sticking out to catch on anybody/anything.