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Screw – This is a product belonging to the category of threaded fasteners. Its appearance is approximately the same as that of the bolt, but these connecting parts differ in the preferred installation method. So, if a bolt is used most often in conjunction with a nut, then the screw is used mainly as an independent fastening device. By design, the screw looks like a rod with threads rolled along its entire length or on some part.
Fasteners – provide attachment of one part to another.
Installation – fix the position of one part relative to another.
The screw consists of a rod that is screwed directly into the material and a head, which is necessary to give it a torque. The shapes of the heads, in many ways, form the types of screws and give them a name.
Hexagonal – According to OST 1 31509-80, OST 1 31508-80, OST 1 31507-80, OST 1 31501-80, OST 1 31502-80, OST 1 31503-80
Cylindrical – OST 1 31522-80, OST 1 31516-80, OST 1 31521-80, OST 1 31515-80, OST 1 31514-80
Secret – OST 1 31542-80, OST 1 31543-80, OST 1 31552-80, OST 1 31544-80, OST 1 31551-80
Semicircular – strong> OST 1 31528-80, OST 1 31529-80, OST 1 31566-80
Plano-convex – OST 1 31537-80, OST 1 31538-80, OST 1 31539- 80
Screws shall be manufactured in accordance with the requirements of this standard. The quality of the materials and semi-finished products used must be confirmed by accompanying documentation (certificates, analyzes, etc.).
Wire and bar upset.
Turning from bars.
It is allowed to use wire and rods intended for upsetting for turning, and used for turning for upsetting.
Screws are made from various grades of steel and alloys:
Heat treatment improves the properties of metals and alloys without changing the chemical composition of the metal.
Usually, parts are thermally treated at the initial or final, and sometimes intermediate stages of preparation. Heat treatment is carried out in order to soften or strengthen the workpiece. Each type of metal has its own temperature of thermal action, respectively, and the types of heat treatment are also different.
JSC “ PLANT MIR ” performs all types of heat treatment:
To increase the service life of hardware, anti-corrosion coatings specified in the regulatory documents are provided.
The processes of electroplating metal coating differ in their characteristics depending on the material used.
The types of electroplated coatings are: