Torx is the trademark for a type of screw head with a six-point star-shaped intrusion, hence the generic name star screwdriver. These exist to ensure even more 

Use the square head to turn these screws by hand, or use a wrench when you need more torque. Also known as half dog-point set screws, they have a protruding tip that locks within a mating hole or slot to keep parts aligned. T-Slot Fasteners and Setup Studs. T-Slot Bolts.

In 1908, P.I. Robertson invented the square head screw, which is why the square head screw is also known as the Robertson screw head. The square head screw is used in woodworking, construction, and electrical projects. 13. Button Head Screw. Button head Screws have a over-sized, high profile domed head. The drive on the top of the head is

Square head screws were the industry standard before hex bolts gained importance. #17 Self-drilling Screw. As the name suggests, this type of screw is used to attach a wooden workpiece. A wood screw is commonly made of brass, steel, and bronze materials. Wood screws have different threads and are available in a variety of heads.

Bolts with square heads, commonly known as screws, are meant to be driven with a grip wrench. These bolts are typically employed for aesthetic reasons, such as to lend character to new construction or to match present bolts in older structures. Buy Square Head Bolts Screw From Amazon 8. Socket-Head Cap Screws

In 1908, P.I. Robertson invented the square head screw, which is why the square head screw is also known as the Robertson screw head. The square head screw is used in woodworking, construction, and electrical projects. 13. Button Head Screw Button head Screws have a over-sized, high profile domed head. The drive on the top of the head is hexagonal.

That's a countersunk head bolt. Not even a screw ;).

The Robertson screw, otherwise known as a square-drive screw or Scrulox screw drive, is, as the name suggests, a screw with a square-shaped 

Square-Drive Small-Head Drilling Screwsfor Joining Drywall to Metal Framing. These square-drive screws have a drill point that powers through drywall and into metal studs up to 0.105" thick. Heads are one-third smaller than those of other drywall screws.

Until the square drive screw was invented, nearly all screws were slot head or straight drive screws. Square drives, also known as Robertson 

It is a Canadian screw head called a Roberson. It is superior to Philips heads because they really have a good friction fit to the screwdriver (the square