The formulation of self-tapping screw performance standards suggests that our manufacturers should follow special standards as the basic standard while formulating self-developed self-tapping screws and self-tapping screw fastener product standards. There are two standards for identifying self-tapping screws and self-locking and anti-loosening screws or whether their performance is good or bad.

Despite the national military standards, only testing methods are provided. One is the national standard, and the military is the national standard. After entering the tempering furnace, iron oxide occurs due to the effect of carbon and temperature, forming a red rust color; The water quenching medium is used for a long time, and the rust prevention in the medium can be reduced to form part rust.

The way to deal with this question, such as pre-treatment before the screw feed into the heat treatment, that is, clean with alkali or acid, and remove the phosphate film on the surface China Concrete Screws factory of the workpiece. After the blackening agent is used for a period of time, usually half a year, the blackening agent must be exchanged throughout the tank. The application temperature should be maintained between 40-50 ℃, and it must be often mixed when not in use to keep the blackening agent in good condition.

The change to abrupt change will eventually damage the application function. For the above questions, the solutions are as follows: Remove the phosphating film; Improve the heating temperature of zone 1 of the mesh belt furnace; When using oil quenching agent, the reasonable temperature should be below 60°C to reduce the aging process of the oil; The control of the carbon potential in the furnace, under the premise of ensuring no decarbonization, reduce the carbon potential as much as possible; Always check the data of water quenching medium, and add rust inhibitor when necessary. 

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Nylon stockings woven with this fiber are both transparent and durable than stockings. They are the three major synthetic fibers (polyester fibers). DuPont made a sensation when it publicly sold nylon stockings at its headquarters on 10 mesh, 1939. Due to the characteristics and wide range of uses of nylon, it developed very rapidly after World War II. After hundreds of failures, finally Invented polyamide (nylon 66) material and picked the jewel on the world's 5000-year-old 'fiber crown'.

From the outbreak of World War II until 1945, the nylon industry was shifted to parachutes, aircraft tire cord fabrics, military uniforms and other military products. mainly produces and sells screws, stainless steel screws, anti-theft screws, special screws, non-standard screws, aluminum pull nails, precision screws , Screw manufacturers, special screws, etc. the synthesis of nylon laid the foundation for the synthetic fiber industry, and the emergence of nylon first gave textiles a new look.Let me talk about history together: Rothers and nylon fasteners

In 1935, the American scientist Carothers (1896～1937) put forward the theory of polycondensation through arduous research process like a golden key, opening the door to the mysterious palace of polymer science. All kinds of nylon products, from stockings, clothing to carpets, fishing nets, etc.

The biggest feature is that it is easy to install and disassemble, and it can be disassembled without tools. They are mostly used for connection and fixing of parts that are not disassembled during use. It is usually used for the connection of plastic parts. Not only are they beautiful, but also other brands.Now the buckle connection technology has been increasingly applied to the connection of automotive interior parts'. However, too small deformation is easy to cause unstable installation; too large deformation is easy to cause installation difficulties or even failure to install, and damage the buckle China Black Screw , Nylon fiber, acrylic fiber). Use 'as thin as spider silk, as strong as steel wire, and as beautiful as spun silk' to praise this fiber

 

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