What is a non-standard part? What do non-standard parts usually include?
Apr 03, 2021
What is a non-standard part?
Non-standard parts are produced in accordance with national standards, but have not passed the testing certification, or according to the needs of the user design and processing, does not have the standardized, serialized, universal characteristics of the equipment variety.
What do non-standard parts usually include?
Non-standard fasteners usually include the following parts:
(1) Bolt: a kind of fastener composed of a head and a screw, which shall be matched with a nut to fasten and connect two parts with through holes.This type of connection is called bolt connection.If the nut is unscrewed from the bolt, the two parts can be separated, so the bolt connection belongs to the detachable connection.
(2) Stud: a type of fastener with no head and only external threads at both ends.To connect, one end must be screwed into a part with an internal threaded hole, the other end must be screwed through a part with a through hole, and then screw on 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 in the situation where the thickness of the connected parts is large and the structure is compact, or the bolt connection is not suitable because of the frequent disassembly.
(3) screw: is also composed of head and screw two parts of a kind of fastener, according to the use can be divided into three categories: machine screws, setting screws and special purpose screws.Machine screws are mainly used for fastening connection between a part with a fixed threaded hole and a part with a through hole without the need for a nut match.Set screws are mainly used to fix the relative position between two parts.Special purpose screws such as hoisting ring screws for hoisting parts.
(4) Nuts: with internal threaded holes, the shape is generally shown to be flat hexagonal column, also has a flat square column or flat cylindrical, with bolts, studs or machine screws, used to fasten the connect.
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