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Screws can be divided into three categories by use

Date:2015 / 06 / 17    Source:本站

Screws can be divided into three categories according to purpose: machine screws, set screws and special purpose screws. Machine screws are used primarily for fastening connections between a threaded threaded hole part and a part with a through hole, without the need for a nut fit (this type of connection is referred to as a screw connection or a detachable connection; Used with nuts for fastening connections between two parts with through holes.) It is also the most common screw.


The set screw is used primarily to hold the relative position between two parts. Our saying is called "head screw", the role of the equivalent of the role of positioning pin.


Special purpose screws are used for hoisting parts such as eyebolts.


Carbon steel bolts grade is divided into 3.6,4.6,4.8,5.6,6.8,8.8,9.8,10.9,12.9 more than 10 grades, the figures before and after the decimal point, respectively, said bolts of the nominal tensile strength and yield ratio, for example: Marking 8.8 bolts that the material tensile strength of 800MPa, yield ratio of 0.8 to yield strength of 800X0.8 = 640MPa welcome to consult the purchase.

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