[PJB]

Anyone have any idea what this nut is called?
From a cheap Chinese scooter company. and they are no help

[Countrysailor]

It looks to me like some sort of locking nut. Does the flat bit at the back bend over the nut to lock it on the flat part of the nut?

[Ben J]

Thats new one for me. Its a variation of tri-groove or tri-wing.
I wonder if a standard six or 12 point socket could be forced to work getting it off.

[lurkinglime]

I have a link for this security nut manufacturer somewhere. They sell a special tool, not too expensive or difficult to purchase. In my case, I just used one of those "universal" gator grip sockets (about $10 at home depot) and it did the trick with a moderately powerful impact wrench. You'll need steady downward pressure and good contact. Keep your receipt. I had my first socket get destroyed, but they were happy to replace it.

[PJB]

lurk if u have the link that would be awsome.

ya the nut has a tab going into the back

[JonDon]

Either use one of this bolt remover nuts or just cut two notches with an angle grinder so that you can use a regular wrench.

[roger2544]

tri?