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Introduction to screws and bolts

2022-11-25

Screws and Bolts are two similar types of fasteners, usually made of metal, that are characterized by a spiral ridge called the external thread (external thread).
Definition of thread: A thread is a shape with a uniform spiral thread projection on the external or internal surface of a solid .
screw means Screw (foreign name: Screw), a tool that uses the physics and mathematics of beveled circular rotation and friction of an object to tighten the instrumental mechanism in a progressive manner. Screw is the generic term for fastener, everyday verbal language.
The metric thread is measured in MM (millimeters), and it has a 60 degree tip angle. Both the American and Imperial threads are in inches. American threads also have a tip angle of 60 degrees, while imperial threads have a tip angle of 55 degrees.

Bolt: A mechanical part with a cylindrical threaded fastener with a nut. A type of fastener consisting of two parts, the head and the screw (cylinder with external thread), which needs to be fitted with a nut and is used to fasten the connection of two parts with through holes. This form of connection is called bolt connection. If the nut is screwed off the bolt, and the two parts can be separated, so the bolt connection is a removable connection.

screw

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