Flat head screw
One of the most basic tools in any toolbox is the flathead screwdriver, and it’s also one of the most abused. Clever (or impatient) handymen and handywomen put their flathead screwdriver to work as a chisel, a nail-puller, a paint scraper, an awl or even a pry bar. It’s important to always keep a good quality screwdriver in your tool box and replace it when the blade begins to show signs of degradation or it becomes too worn to function properly.
There are several different types of flat head screws, and each has a unique application. John walks you through the basics of each type and offers some tips about selecting the right screw for your project.
For example, he explains the difference between Pozi and Phillips drive flat head screws, which are used for woodworking. The Pozi head is slightly domed and has a flat underside, while the Phillips drive screw has a flat top surface and a raised, countersunk countersink on the underside. He also explains how to select the correct screw for your job, including what length and threading you need and whether you’ll benefit from using a hex or square drive screw.
He also discusses other types of flat head screws such as oval or round heads. The big distinction is in whether the shank of the screw needs to be tapered for a countersink or not. If it does, then a round head is the way to go. If it doesn’t, then an oval or a flat head is perfect. The other big difference is that a round head protrudes further than an oval or flat head, which is useful if you’re accenting an upholstery edge or mounting a piece of hardware with a flat, non-countersunk screw hole. Flat Head Screw