I know about clutch head screwdrivers used on GM cars and trucks in the 40s and 50s. I have owned many old Chevies with them. Recently i have bought several screwdrivers that somebody called the new style clutch head screwdrivers. They are like a plain everyday driver except they have a straight blade with a round post in the middle. What is the story about them ?

EvilDr235

If I under stand correctly your talking about a tamper resistant screw. Could that be it?

Like this

It has a blade like a straight tip screwdriver that one would use to drive wood screws, but in the middle of the blade it has a round section. i read that is the type of screwdriver that is made for clutch head screws. My grand daughter is not here right now or i would have her post a picture.

EvilDr235

Quote from: Nolatoolguy on May 29, 2015, 04:36:52 PM
Like this

These are called tamper-resistant TORX.


Clutch type screws have a drive hole that looks sort of like an hourglass. These are the bits for them.
http://www.vintagetrailersupply.com/Clutch_Head_Screw_Bits_p/vts-578.htm

There are two types of clutch head type A and type G. You sound like you are describing type A.

They have the one-way clutch head used in many restrooms, & the clutch head types (like an hourglass)..

bill300d has solved the puzzle. It is clutch head type A. I have several of the drivers, but have never seen one of the screws. maybe now i can sleep at night. Thank you bill300d for solving the puzzle.

EvilDr235

I have a couple of type A drivers and have never had a need to use them.  Then again I've never seen a fastener with a type A head on it that I can remember.

bill

Some Mobile homes use clutch heads on the siding

Wow guys you are pretty smart,


What I learn here never seizes to amaze me.

After a lot of years I am firmly convinced there are more types of security screws than there are security screwdrivers.  I have at least 3 "COMPLETE" according to the salesman, sets of security screwdrivers, and still find screws I don't have a driver for.

Hang in there Nola, I got a number of years on you and I still learn new tings almost every day.

Yea If your not learning something new every day no matter what it is your your not paying attention.

bill

Check this site out... everything you ever wanted to know about screw drive bits.  I opened the page at the little known "Fearson" bit, not to be confused with Philips.

http://apexbits.com/apex-frearson-reed-and-prince-screwdriver-bits.aspx

Joe B

Quote from: bill300d on May 30, 2015, 05:01:28 AM
There are two types of clutch head type A and type G. You sound like you are describing type A.

I found this old thread by doing a search on clutch head drivers. I've had this Apex driver for a long time and now I know a little more about it. Thanks, Bill!
-Don