I thought, probably wrongly, that all the original fixings were triple square and the replacements were hex?
too add to the confusion 12 of my new bolts were flat ended and 12 pointy - the pointy ones were easier to locate.
smallest one i could get £9.96 - i suspect i'll only use the one size as in all my 44 years i've never used a set before....
Possibly, but I think the main reason for Torx, splined etc is for ease of production (bloke hanging upside down on assembly line with air screwdriver). I think Torx were specifically designed to make life in a factory easier: easy to get driver head in and won't cam out once the torque's been reached.
I have noticed that a lot of good wood screws spax ect are going to these instead of cross head types, they do stay on the bit better I have noticed.
I fitted a doorframe with frame fixings a while ago, and if the screws hadn't have been Torx head, I'd never have been able to do them up - really tight. I used my socket set in the end...
When I was a window and door fixer, I soon learned the correct tool for a screw is a hammer. The slot it just for final adjustment.
They bashed slowly-decomposing nails into the doorframe and mortared them in, if the original 70s one was anything to go by. I reckon another 10 years and you could've ripped the door frame out...
My Dad was the only person I ever saw put slot head screws in with a Yankee screwdriver and never slip. I still have a scar on me thumb from trying to do the same.