A screw is one of many types of stainless steel fasteners that have a spiral ridge column, known as a threads, and slots on the head for easy use of the screwdriver. The historical use of screws, which is still the most common use today, is their ability to hold items together and to hold items in position. The screw first appeared in ancient Greece by the first century BC, however, exactly when it was invented is not unknown. Greek philosopher, Archimedes was the first to qualify the screw as a type of machine. Much has been made of this simple mechanism over the centuries. In general, all the Greek philosophers have defined this fastener as one of the simplest machines. In particular, they had tremendous respect for its capabilities within domestic and battlefield uses. These stainless steel fasteners have a head, which is a specially designed to allow the screw to be turned, or even pounded in, if need be. The head of the fastener is usually much larger than the thread column of the screw, which keeps the fastener from being turned and driven in to the material deeper than its length. This provides a bearing surface. The design of a screw was created so you can increase the rotational force or torque on the shaft as you drive it in to the material. This stainless steel fastener will accept a great amount of pressure so it will continue to tighten up. The tighter the thread column or pitch, (which s the distance between the threads) the greater force can be applied. It's important to note that the majority of stainless steel fasteners are tightened in a clockwise direction or what is known as a right hand thread. Fasteners with left hand threads are used quite rarely. For example, on a bike, the left side pedal will have a left-hand thread.
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