what this metal ring called?

These collars are found in a variety of applications large and small, this particular one came out of a broken flatbed scanner. I've seen variants with bearings on the inside ring allowing full rotation in industrial settings and small hobby ones used for axles.

So, is there a name for these?

Comments

[iceng]

It's called a  Rigid coupling shaft collar
http://www.directindustry.com/prod/misumi/rigid-couplings-shaft-collars-32592-390652.html

A

[iceng]

Oh yea the Pic.

[Lorddrake]

agreed

[mikeasaurus]

awesome, thanks!

[I am in the shed!]

I've always believed it to be a locking collar.

[sam D]

Somtimes referred to as a collet.

[Jayefuu]

It's not a collet...

[Jayefuu]

A bush.

[CameronSS]

That's one in the hand. Is it worth two in the bush?

[pacuzzo]

Hello, it's name is bushing.