Masonry screws come in two common head types: a flat head for countersinking, or a hex washer head to sit on top of the surface of the material. These Tapcon 1-1/4-in. x 3/16-in, concrete anchors ...

the wrong type of metal for the wood you're using, or a whole host of other common mishaps. No matter the source, the result is a screw head with a mangled internal surface and no hard angles for ...

Not all drive types can be driven ... t or don't want to use a torx screw, your next best bet would be the old standby, Phillips-head drives. They're cheap, common, they do a reasonably good ...

Meanwhile, other engineers worked on their own types of screw heads. The Robertson screwdriver. According to Rybczynski, the one that stuck came from inventor John P. Thompson and businessman Henry F.

Breakthroughs, discoveries, and DIY tips sent every weekday. Terms of Service and Privacy Policy. The common screw may not have been screaming for a makeover, but ...