Everything you never knew you needed to know about Recessed Screw Drives
Combination drives (Combo-head, Combi-head)
You will find these on Kitchen fittings and knock-down fasteners. The combination reccessed drive heads mean that you can use what ever driver you have handy…
Double slot
Not strictly speaking a combination drive, this head has two slots so you can pick the most convenient one to stick your driver in. Usually seen on roofing bolts.
Combination Phillips-Robertson, Quadrex, Recex
Combines the Best Features of Cross recess and square socket drives. The Quadrex recess increases productivity by incorporating the torque transmission and cling fit of the Square Socket drive with the desirable field repair and retrofitting features of the Phillips drive.
Here is a good visual of the Quadrex drive
Robertson also have a version, know as the Recex drive system.
Square-Drive, PoziSquare-Driv
Phillips have their own brand Square-Driv and PoziSquare-Driv combination drive systems.
Combination Phillips-Slot, Cross-Slot
Apparently popular in the electrical field. Also used on concealed (European Style) Cabinet hinges.
Combination Slot-Robertson, Slot-Square
I have no further comment…
They is what they is…
Combination Hex-slot
Combination Torx-Slot
Combination Hex-Slotted
Combination Hex-Phillips
Qua-Drive, Combination hex, slotted, Phillips, square
The Qua-Drive is from Avanti screws
Tri-Drive, Slotted, Philips, Square
The Tri-Drive is another product from Avanti
Next – Security screw drives…
Nice one Paul, a very detailed analysis. One I’ve been using recently is the coach screw with an external hex head like a but. Were the early tapered screws cut or pressed?
Hi Andy,
That’s a great question! As far as I can tell, all early screws were hand cut until automation came in with Jesse Ramsden’s screw-cutting lathe in 1770.
Paul
Don’t forget JIS, the crosshead that is neither Phillips or Pozi that you find when dismantling consumer electronics. Hard to find drivers for (at least there in the UK), but they are very handy.
Ahhh! Great find Richard – thanks ;)
Here’s a great article that shows the difference between JIS (Japanese Industry Standard – Cross point Recessed Drive)
http://www.vesseltools.com/hand-tools/screwdrivers/jis-japanese-industrial-standard/view-all-products.html
Paul
McMaster-carr has a high security screw
http://www.mcmaster.com/#socket-head-cap-screws/=f4p5a0
Thanks for the link.
http://www.ifixit.com/blog/blog/2011/01/20/apples-diabolical-plan-to-screw-your-iphone/