Fasteners knowledge – Shenzhen Shi Shi Tong Screw Factory

Fasteners usually include the following types of parts:

Bolt: a type of fastener consisting of two parts, head and screw (cylindrical body with external thread), to be fitted with a nut for fastening two parts with through-hole.This type of connection is called bolted connection.If the nut is unscrewed from the bolt, it can separate the two parts, so the bolt connection is a detachable connection.

Stud: a type of fasteners without a head, having threads at both ends.When connecting, one end must be screwed into a part with an internal threaded hole, the other end must pass through the part with a through hole, and then screw the nut, even if the two parts are firmly connected as a whole.This type of connection is called a stud connection and is also a detachable connection.It is mainly used for one of the connected parts with large thickness, compact structure, or frequent disassembly.

Screws: also by the head and screw two parts of a class of fasteners, can be divided into three types by use: machine screws, set screws and special purpose screws.Machine screws are mainly used for fastening a part with a fixed threaded hole to a part with a through-hole, and do not require nut fit (this kind of connection is called screw connection, which is also a detachable connection;Also fitted with nuts for fastening between two parts with through-hole.The tightening screw is mainly used to fix the relative position between two parts.Special purpose screws such as rings for lifting parts.

Nuts: with internal threaded holes, usually in the shape of flat hexagon pillar, also in the shape of flat square column or flat cylinder, with bolts, studs or machine screws, used for fastening two parts together to make them a whole.

Self-tapping screw: similar to machine screw, but the screw thread on the screw is for special self-tapping screw thread.It is used for fastening two thin metal members together to make them into a whole. Holes need to be made on the components in advance. As the screws are of high hardness, they can be directly screwed into the holes of the components to form a responsive internal thread in the components.

Wooden screw: also similar to machine screw, but the screw thread on the screw is a special wooden screw thread, which can be directly screwed into the wooden component (or part), for fastening a metal (or non-metal) part with a through hole to a wooden component.This connection is also a detachable connection.

Washer: fasteners in a flat circular shape.It is placed between the supporting surface of bolt, screw or nut and the surface of the connecting part, playing the role of increasing the contact surface area of the connected part, reducing the pressure per unit area and protecting the surface of the connected part from damage.Another type of elastic washer also prevents the nut from loosening.

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