VCCA Home Forums TECHNICAL - 1945 AND EARLIER 1937-1945 Name of Screw Head

What is the name of those small screws with the head the shape of a fat hourglass. I used to have a set of those screw drivers but now I only have one and it doesn't fit most of the mentioned screws I come in contact with on my 41. I think they are used to hold the headlight frame to the fender and other places as well. They are not trux, phillips, slot, allen. Best, Charlie

BTW: I could have simply asked Chevgene, who is a tool salesman but I thought others may benefit from the answer also. All I can find are the new fangled stuff with the closest thing being a square tip.

http://images.google.com/imgres?imgurl=http://danlockton.co.uk/research/images/onewayscrew.jpg&imgrefurl=http://architectures.danlockton.co.uk/2008/05/26/one-way-turn-of-the-screw/&usg=__IsNCZc_g3uwvp9qeAzSa5rit99M=&h=310&w=450&sz=27&hl=en&start=7&um=1&tbnid=dHDvb2zFketnMM:&tbnh=87&tbnw=127&prev=/images%3Fq%3Dtamper%2Bproof%2Bscrews%2Buk%26hl%3Den%26rlz%3D1R2ADRA_enUS354%26sa%3DN%26um%3D1

They are meant to be used on something that has little chance of being removed.You need a tool to unscrew them.

Sounds like clutch head.

If I'm wrong, I'll soon know!!

Yes, 41specialdeluxe, Virgina, and Ken, they are indeed Clutch heads!
There are several sizes used in Chevrolets of the 49-54 years and I suppose there may be some in the 55s and up.

I have two sets of clutch head drivers with a 1/4" drive socket heads on them, I bought them at a swap meet (VCCA LSR's swap meet in Trader's Village in Grand Prarie, Texas Lone Star Region Swap Meet

Clutch head

Originated by United Screw and Bolt. The recess in clutch heads looks like a bowtie. In a pinch, a clutch head screw can be driven by a slotted screwdriver. A worn tip on a driver can easily be restored by grinding off the end. Clutch head screws were popular in mobile home construction and electric motors. The size is the maximum diameter in inches of the bit point. 1⁄8″, 5⁄32″, 3⁄16″, 1⁄4″, 5⁄16″

All of the forties and fifties Chevy and GMC trucks have a special type of screw/bolt called a clutch head. When you are working on disassembling the bed of your truck you need the larger 5/16" clutch head screwdriver. When you are working in the cab all of the dash, doors and striker plates require clutch head screwdrivers - from 5/32" to 5/16".

If you try to take one these out with a regular standard screwdriver it just won't work. You will strip out the head and this screws up a good project.

The four piece set includes 5/32", 3/16", 1/4", and 5/16". This set will do anything related to clutchead on a Chevy or GMC trucks. We have also noticed that people who are working on Corvettes need these screwdrivers.

You can find clutch head drivers here:
Skyway tools.com

P.S. I think that information on clutch heads is needed by Chevrolet restorers, I hope this is helpful.
MrMack

Thanks to all the quick respondees. And thanks MRMack for a source.