What is this called ?

[Toolfool]

I have no idea what this is called. Any help ?

 

[MongoTA]

A threaded star insert for tubing.

 

[4xdog]

Commonly used on threadless headsets on bicycles.

 

[The Cobbler]

looks like an insert to push into pipe and thread a caster or threaded foot into that

 

[FigN⋅m]

 

[Toolfool]

Star nut, makes perfect sense. Never seen one before. Thanks folks.

 

[rlitman]

looks like an insert to push into pipe and thread a caster or threaded foot into that

I see that too now that I see it's scale, since it is on a paper towel. My first thumbnail impression was that the thread was 5/8-11, and it's the hub for an angle grinder sanding disc.

 

[413dan]

Star nut, makes perfect sense. Never seen one before. Thanks folks.

ive never seen one either. the video was worth the watch, at least I found it entertaining. cool thread

 

[Beerhippie]

I see that too now that I see it's scale, since it is on a paper towel. My first thumbnail impression was that the thread was 5/8-11, and it's the hub for an angle grinder sanding disc.

My first thought, too. Followed by "SCARY!"