Self tapping screws are also called self drilling screws. They get their name because they drill a hole in the metal as you are driving it to hold two or more pieces of metal together without jiggling them around to make sure the holes line up. This is particularly desirable if you are mounting, say, a television screen on a metal frame, or placing a sheet of corrugated metal on the back side of a set of shelving.
These are wonderful, time-saving devices. You can mount sheet metal or corrugated metal to a steel frame easily and quickly without tearing your hair out or swearing at anybody. They are also useful for mounting surveillance cameras. Other uses for a self-drilling screw include surgery and dental implants.
The heads of these remarkably useful devices are in the Phillips or crosshead configuration. This gives the drill bit a little more leverage when drilling it through two or three layers of metal. Plain ones are also available. It just goes to show how important it is to have the right tool for the job and how a subtle change to form can make a huge difference in function.
The great majority of screws are right-handed, or clockwise in threading. To loosen it, turn the screwdriver counterclockwise; to loosen it, go the other way. Everybody remembers lefty-loosey, righty-tighty. The same rule applies when opening and closing jars or for controlling the radiator.
There are numerous other kinds of screw. There are differences in the pitch (the distance between threads), and they differ in composition (steel, zinc, copper, nickel, brass or chromium). They can have different heads, flat or round; plain or Phillips head (cross head).
Henry F. Phillips bought the design from a guy named John P. Thompson, tinkered with it then patented it. One of his early customers for the new technology were the makers of the Cadillac, General Motors. Phillips, in ailing health, sold the patent to Ford Motor Company in 1945 for a whopping $5 million, a lot of money now and a whole lotta money then.
A left-hand screw is used for something that is going to encounter severe counterclockwise forces, such as the left pedal of a bicycle. In this case, ordinary screws would come undone. Any linear actuator with helically arranged threads may legitimately be termed a screw. Archimedes' screw water pump and ship's propellers are examples.
Self tapping screws are wonderful, simple, labor-saving devices that enable the fixing of two pieces of metal together without needing to drill a pilot hole first. This means not having to fiddle around trying to line up holes afterwards, which can be a bit of a pickle to handle. Sometimes the simple inventions are the best. There are many, many varieties of screw, which vary in diameter, length, pitch and the type of head. They come in different metals, including zinc, nickel, copper, chromium and steel.
These are wonderful, time-saving devices. You can mount sheet metal or corrugated metal to a steel frame easily and quickly without tearing your hair out or swearing at anybody. They are also useful for mounting surveillance cameras. Other uses for a self-drilling screw include surgery and dental implants.
The heads of these remarkably useful devices are in the Phillips or crosshead configuration. This gives the drill bit a little more leverage when drilling it through two or three layers of metal. Plain ones are also available. It just goes to show how important it is to have the right tool for the job and how a subtle change to form can make a huge difference in function.
The great majority of screws are right-handed, or clockwise in threading. To loosen it, turn the screwdriver counterclockwise; to loosen it, go the other way. Everybody remembers lefty-loosey, righty-tighty. The same rule applies when opening and closing jars or for controlling the radiator.
There are numerous other kinds of screw. There are differences in the pitch (the distance between threads), and they differ in composition (steel, zinc, copper, nickel, brass or chromium). They can have different heads, flat or round; plain or Phillips head (cross head).
Henry F. Phillips bought the design from a guy named John P. Thompson, tinkered with it then patented it. One of his early customers for the new technology were the makers of the Cadillac, General Motors. Phillips, in ailing health, sold the patent to Ford Motor Company in 1945 for a whopping $5 million, a lot of money now and a whole lotta money then.
A left-hand screw is used for something that is going to encounter severe counterclockwise forces, such as the left pedal of a bicycle. In this case, ordinary screws would come undone. Any linear actuator with helically arranged threads may legitimately be termed a screw. Archimedes' screw water pump and ship's propellers are examples.
Self tapping screws are wonderful, simple, labor-saving devices that enable the fixing of two pieces of metal together without needing to drill a pilot hole first. This means not having to fiddle around trying to line up holes afterwards, which can be a bit of a pickle to handle. Sometimes the simple inventions are the best. There are many, many varieties of screw, which vary in diameter, length, pitch and the type of head. They come in different metals, including zinc, nickel, copper, chromium and steel.
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