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3 SLOT "PHILLIPS" SCREW
2

3 SLOT "PHILLIPS" SCREW

3 SLOT "PHILLIPS" SCREW

(OP)
Hi all fastener people.

Yesterday I found a 3 slot philips screw , each slot at 120 °.
Does any one what is it, where are the toll to handle it?.

It is a number 8 x 1/2" length.

Thanks


RE: 3 SLOT "PHILLIPS" SCREW

What was the original application if known?  I'm just guessing this may have been an attempt at making the device in question proprietary; where only the OEM manufacturer would have the correct tool to engage the fastener.  Phillips and Torx fasteners work pretty well for no-slip machine driving of screws, I don't see any advantage in 3 slots other than limiting access to serviceable components such as an automotive EFI computer or emission controls.


Blacksmith

RE: 3 SLOT "PHILLIPS" SCREW

(OP)
Yes the use is known, and nobody could make such a mistake.
It was at the electrical connection lid at a split air conditioner, of course that for a safety reason is a good place , but the OEM must supply a tool to handle it.
I had to dissambly all the unit and unscrew it with a plier from the inside.
I had it on my desk a proof .
Thanks

RE: 3 SLOT "PHILLIPS" SCREW

I noticed awhile back while on a plane (Dash-8) all the screws, at least all I could see,  were 3 wing phillips....Mike

RE: 3 SLOT "PHILLIPS" SCREW

What you have is probably a fastener with a "Tri-Wing" recess.  Do an internet (e.g. google.com) search for "Tri-Wing" (this is a trademarked name) and you will find a wealth of fastener and bit suppliers...

RE: 3 SLOT "PHILLIPS" SCREW

(OP)
Thanks all you boys.

RE: 3 SLOT "PHILLIPS" SCREW

(OP)
I do the searching, only I got was the bits to handle it.
Do you know who is the manufacturer of those screws?

RE: 3 SLOT "PHILLIPS" SCREW

Try http://www4.thomasregister.com/red_search, I did a quick search and came up with a few listings. The only thing I found was the words tri-wing had to be joined with a hyphen or else it wouldn't find a thing...Mike

RE: 3 SLOT "PHILLIPS" SCREW

Edit to above message, has to be tri-wing <U>screws</U>..Mike

RE: 3 SLOT "PHILLIPS" SCREW

Tri-wing fasteners were originaly developed for the Lockheed L-1011 Tri-Star aircraft built in the early '70s. They were one of the worst examples of modern technology to ever have been created. Typicaly, you would use a screw driver to install them and EDM to remove them.

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