What's new
CK5
Register an account today to become a member! Once signed in, you'll be able to participate on this site by adding your own topics and posts, as well as connect with other members.

fastener identification

anwat

anwat

1/2 ton status
 Premium
Joined
Apr 28, 2019
Posts
801
Reaction score
609
Location
Long Beach, CA
Anyone ever seen a fastener like this? More importantly what type of tool installs/removes this? I have a store nearby that sells surplus aircraft industry stuff, and fasteners are by the pound. Wasn't paying attention, and thought it was a dirty phillips head, so I bought a few pounds worth. Useless unless I can figure out how to drive them. Obviously something to do with the underside of the head, but I'm lost from there.
Markings on the head appear to be "SPS" over an "s". Or maybe "SFS" over an "S". Nothing else I can find in the way of markings.

Anyone?

IMG_0745.JPG

IMG_0747.JPG

IMG_0749.JPG
 
Don't know and never want to see those ever. I would use a left hand drill bit to try and remove.
 
Kinda looked like those are put into place like a carriage bolt and actually fastened from the 'nut' except for the self drilling head.
 
Def some kind of security screw.. Would never be able to come out again, once it's driven in. May be ok for cansiter damascus knife blade though.. :D
 
That's what I was thinking, especially since the "prongs" are serrated in one direction....I just can't figure out what would drive that flush with the surface. It seems that drive area would have to remain above the surface, meaning the whole thing would protrude more than necessary. I'm thinking along aircraft lines, based on where I bought them, but really can't think of how such a thing would be used. Someone will recognize them for sure.
 
My dad would put one on each interior panel in the cars he built. Then he knew if anyone had messed with it later if there were issues. Especially over wiring areas.
 
ktmoutfront said:
My dad had a bit that drove some like that. Had a sleeve that slid down to clamp the prongs under the head of the screw. We never had to use one.
Click to expand...

Wow. I was tired when I wrote that. Sentence just ended.

We never had to use one to try and remove them. It supposedly would.
 
ktmoutfront said:
Wow. I was tired when I wrote that. Sentence just ended.

We never had to use one to try and remove them. It supposedly would.
Click to expand...
Yeah, there's a special driver on that PDF that supposedly removes them. It's a bit expensive for my blood just to be different and have a cool screw. But if I already had one for another purpose, I'd have those things everywhere.
 
I was interested just to see what the result was going to be. Would’ve have never guessed what they were for
 
See them all the time on metal deck.
Metal deck being the roofing for industrial construction.
 
You must log in or register to reply here.

Latest Posts

Top Bottom