What are these sockets used for?

[Idlem]

I have 3 of these Proto sockets, what are the fasteners called that they are used on?

 

[cvairwerks]

Clutch drives

 

[bob15]

Clutch head. Somewhat tamper proof. Seen then on RV trailers.

 

[Mooreag47]

Looks to me they are used for tamper resistant fasteners

 

[48548]

Clutch head. My 51 chevy uses them for the fuse panel cover on the firewall.

 

[ttpete]

Clutch head screws. GM used them extensively years ago.

 

[Motorhead67]

As mentioned earlier, clutch drive for fasteners used for public restroom partitions etc..

 

[LXCam]

Well just in case no one has mentioned it yet, those are clutch head drivers.

 

[48548]

Are we sure they are clutch head?

 

[HighPlainsWrencher]

I've been told by a couple people those are clutch head but we may need a couple more to confirm.

 

[48548]

Lets change this to show us your clutch head bit/sockets!!!!

 

[KnurledNut]

There are two types, A and G (newer).

 

[spike99250]

As mentioned earlier, clutch drive for fasteners used for public restroom partitions etc..

I know they look like clutch heads, but those screws are tamper proof straight heads. Most partitions now come with the tamperproof torx head.

 

[KnurledNut]

I know they look like clutch heads, but those screws are tamper proof straight heads. Most partitions now come with the tamperproof torx head.

Also known as "one-way screws". They make screwdrivers for removal. They have two hardened prongs that dig into the tamper resistant "ramps".

The tamperproof torx you refer to are likely a TP-27.

 

[Idlem]

Thanks for all your responses, I learned something!

 

[four.cycle]

^ In addition to those applications listed above, older Holley 4150-type four-barrels used them to attach the metering plates to the main body, which is why I have one in my old 3/8" drive socket set.
Unless I'm mistaken, these were the most popular sizes in 3/8" drive:



(snippet from 1972 Indestro catalog. no idea what Proto part numbers would be.)

 

[avmaine]

I've always wondered what those were.

 

[RBFD415]

Love the fact that 1 style couldn't stand the test of time, we had to improve it, and sell more screwdrivers.

Sent from my SM-G900V using Tapatalk

 

[Mr_fixit]

All you need is the right size regular screwdriver to defeat the clutch drive screws.

 

[davethorik]

I have a couple clutch head screwdrivers, iirc both Proto yellow handles. Didnt know there were sockets too.

 

[Richard Cranium]

I have two set of the clutch head screw drivers.

 

[four.cycle]

I have a couple clutch head screwdrivers, iirc both Proto yellow handles. Didnt know there were sockets too.

^ Not hard to understand why they were made as 3/8" drive socket attachments if you've ever tried to remove one of those metering plates from an old Holley with a lot of miles on it - you'd swear the things were welded on!

 

[larry_g]

As said above the 40's - 50's era Chevrolet cars and trucks used those extensively. They are not the modern tamper proof fasteners.

http://www.ebay.com/itm/1939-1940-1...-clutch-head-Screw-Kit-14-piece-/331562508126

lg
no neat sig line

 

[Pitalplace]

Clutch heads were also used on the older two cylinder John Deere's on the sheet metal.

 

[bubinga]

l have a good size Stanley screwdriver like than.
haven't needed it yet.

 

[joe_padavano]

As said above the 40's - 50's era Chevrolet cars and trucks used those extensively. They are not the modern tamper proof fasteners.

http://www.ebay.com/itm/1939-1940-1...-clutch-head-Screw-Kit-14-piece-/331562508126

lg
no neat sig line

Ford used them also. My 1956 F-100 used them in a lot of places to hold sheet metal. As noted, these are NOT tamper-proof screws.

THIS is a clutch-head screw:

This is a tamper-proof screw:

 

[stage20]

those one way tamper proof tools have never worked for me. ive always grinded a slot and impacted them out with a flat head.

that clutch is old school. why didnt they survive? grab better than a phillips most of the time. and look better, IMO.

 

[MFolks]

https://en.wikipedia.org/wiki/List_of_screw_drives

 

[wafrederick]

Clutch drives were used in mobile homes too.Anything clutch drive is getting very hard to find these days.I have a few,a couple NOS Indestro and one Stanley Clutch drive screwdrivers and one of those Proto clutch drive sockets.Not ever getting rid of them.

 

[MikeF2316]

Clutch drives were used in mobile homes too.Anything clutch drive is getting very hard to find these days.I have a few,a couple NOS Indestro and one Stanley Clutch drive screwdrivers and one of those Proto clutch drive sockets.Not ever getting rid of them.

I've found those cheap kits of 1,000,000 (ok, slight exaggeration) screwdriver bits have them. But, of course nobody knows how good they are...

 

[ttpete]

Clutch screw heads were one of the first to be designed for power installation. Better systems later came out including Allen, Robertson, and Torx.

 

[BDT/NWMN]

Clutch screw heads were one of the first to be designed for power installation. Better systems later came out including Allen, Robertson, and Torx.

For the next question; were those systems really an improvement?

Heck, I could vote for any of them..

 

[bcexplorer]

Funny how things work, on saturday i found a clutch drive proto screwdriver at the restore for 50 cents. Remember seeing the screws somewhere but couldnt remember. Never got around to googling it before i saw this. LOL.

 

[cliftonbros89]

Clutch heads were also used on the older two cylinder John Deere's on the sheet metal.

Yeah. I've seen a lot of them on the JD's. Worked on a lot of 2 cylinders. I have a Snap On clutch socket and a Wilde clutch screwdriver that I've used on them several times. Doesn't scar up as bad as a regular wrench or socket after a fresh paint job.

 

[wafrederick]

I've found those cheap kits of 1,000,000 (ok, slight exaggeration) screwdriver bits have them. But, of course nobody knows how good they are...

Matco used to carry the bits,discontinued them.Those two NOS Indestros I have came from a closed down Carquest auto parts store.

 

[Milton Shaw]

My dad had a GMC step van that used those almost everywhere on the body of the van. He bought several of the screwdrivers so he could find one to tighten them up as the van vibrated so much they would work loose.

 

[bubinga]

I better find mine and put it in a good p-lace, make sure l have it.

 

[enrare]

This is a tamper-proof screw:

[/QUOTE]


How do you remove these type of screws? The previous homeowner of my house had a security screen door installed on the front of the house and these one-way screws were ussed for the installation. I'm needing to remove the security screen door so I can install a new front door. Is there a special tool for removing one-way security screws??