Anyone know this screw ?

[Ben87hall]

 

[nicebutdim]

Looks to be some type of flange button head security screw.

Any I've encountered had 5 or 6 recesses.

 

[DPG]

As above, it's a security screw. Any decent set of security screwdriver bits will probably have one to suit.

 

[brianmoooore]

As above, it's a security screw. Any decent set of security screwdriver bits will probably have one to suit.

If not, file a notch in the middle of a suitable width flathead screwdriver, engage two of the notches and hope it's not too tight.

 

[DPG]

If not, file a notch in the middle of a suitable width flathead screwdriver, engage two of the notches and hope it's not too tight.

Done that before

 

[SJD]

Or a pair of long nose pliers, in opposite notches, will often work.

 

[westward10]

It's like a System Zero screw.

 

[LukeD]

System zero is the closest in design..But they tend to use a 6 rather than a 4 in this case pattern . Remove and replace with something easier to deal with ! whats it on ??

 

[nicebutdim]

It's like a System Zero screw.

System zero is exactly what I had in mind. While very similar, their drive system is different.

 

[suffolkspark]

Find them on old outside bulkhead lights frequently, i remember once having the propper tool but tend to use pin nose pliers

 

[westward10]

Find them on old outside bulkhead lights frequently, i remember once having the propper tool but tend to use pin nose pliers

That would be one of these.

 

[suffolkspark]

That would be one of these.View attachment 105516

I once had one on a plastic handle that looked like the ones you get with some ceiling lights to put lock rings to hold shades on, but with 2 nubs, i probably left it it was years ago