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The basic end and application function of the bolt


 Bolt: A type of fastener consisting of two parts, a head and a screw (cylinder with external threads). It needs to be matched with a nut to fasten and connect two parts with through holes.

Because bolts are also a kind of railway fittings, railway fittings are part of railway lines. The track referred to here includes steel rails, sleepers, connecting parts, track beds, anti-climbing equipment, rail supports, and turnouts.
As an integral engineering structure, the track is laid on the roadbed, which plays a guiding role in the operation of the train, and directly bears the huge pressure of rolling stock and its load. Under the power of train operation, its various components must have sufficient strength and stability to ensure that the train runs safely, smoothly and uninterrupted at the specified maximum speed.
Many people think that bolts just connect various things together, and it seems that there is nothing particularly peculiar about it. But did you know that there are more secrets behind seemingly insignificant bolts and screws? Without them, all appliances and machines would fall apart.
Bolts are one of the most commonly used parts in architectural and mechanical design. They connect everything together-from small screws in razors, electric toothbrushes and door hinges to the large number of concrete pillars used to secure buildings. bolt
Early screws were made by hand. When making, first forge the nail blank of the screw, and then use a hammer to knock out the nail head and round nail body on the nail blank; then, use a saw to cut a groove on the nail head, and then use a kind of "Die" screw steel plate manufacturing thread.
Although the history of threads can be traced back to 400 BC, the most important developments in modern bolts and screw technology have been made in the past 150 years, and experts hold different views on the origins of trivial nuts and bolts.
Frederick E. Graves pointed out in his article "Nuts and Bolts" that the history of threaded bolts and matching nuts used as fasteners can only be traced back to the 15th century. He came to this conclusion based on the first printed screw in a book in the early 15th century.
   However, Graves also admitted that although threaded bolts date back to the 15th century, bolts without threads can be traced back to Roman times, when these bolts were used to latch doors. He also said that the Romans made the first screws out of bronze or even silver. The thread is manually frustrated. The wire is wound on the screw first, and then the thread is formed after welding.
   According to the research of bolt expert Bill Eccles, the history of thread is even earlier. Archimedes discovered the spiral principle and used it to build equipment for lifting water. The equipment is built of wood and is used to irrigate the land and drain sewage from the bottom of the ship.
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