Stainless steel straight thread screw straight thread step iron screw straight thread knurled screw

Stainless steel screw wire, also known as stainless steel cold pier wire, is mainly used for various fasteners, such as mechanical components and electronic application components. According to different materials, corresponding anti-corrosion and mechanical properties can be obtained. In order to obtain a better formability during cold forging, high quality shall be selected. The appropriate material of wire is particularly important.

A flat key is a key that relies on two sides as the working surface and transmits torque by squeezing the key and keyway sides. It is often installed on the shaft. If used for a long time or in a poor working environment for a long time, it is inevitable that there will be dust, oil stains, etc. stuck between the flat key and the keyway. The flat key is difficult to remove due to the lack of a threaded hole for disassembly, and any carelessness during the disassembly process can cause damage to the flat key.

Generally, a countersunk head is used in areas where the surface is required to be smooth without protrusions after connection, as the countersunk head can be screwed into the part. Round heads can also be screwed into the parts. The tightening force of the square head can be larger, but the size is large. In addition, in order to meet the needs of locking after installation, there are holes in the head and the rod, which can prevent the bolts from loosening when subjected to vibration. Some bolts with no threads need to be made thin, called thin waisted bolts. This type of bolt is beneficial for connection under variable forces. There are specialized high-strength bolts on the steel structure, with larger heads and varying sizes. Additionally, there are special uses for T-groove bolts, which are most commonly used on machine tools and fixtures. They have a special shape and need to be cut off on both sides of the head. Anchor bolts, used for connecting and fixing machines to the ground, come in many shapes. U-bolts, as mentioned earlier. Wait a minute. There are also specialized studs for welding, with threads on one end and no threads on the other end, which can be welded to the parts while directly tightening the nuts on the other side.

The main operation method of locking nut embedded knurled copper nut is injection molding. After heating, it is embedded into the plastic part or directly injected into the mold. If injection molding is used, the melting point of P/NYLOY/PET is above 200 ° C. After the embedded nut is hot melted into the plastic part, the temperature quickly increases. After injection molding, the plastic body quickly cools, crystallizes, and hardens. If the embedded nut temperature is still high, It is possible that the copper nut may come into contact with the plastic part and start to loosen or crack. So in the injection molding of embedded nuts, copper nuts are used instead of carbon steel nuts.

"1. The phenomenon of spring washer expanding is generally not a problem with the spring washer itself
2. The spring washer that undergoes expansion must be subjected to a radial outward tension, which originates from the tightening axial force generated by the tightening torque
3. The outer chamfer of the nut support surface generates a radial component of the axial clamping force, which causes the opening of the spring washer to expand. The smaller the chamfer diameter, the greater the possibility of ring expansion
Adding a flat washer between the nut and spring washer can help slow down or prevent the occurrence of ring expansion, but a flat washer that is too thin or too soft cannot prevent ring expansion
5. The reasons for hydrogen embrittlement fracture of spring washers are generally due to unreasonable heat treatment processes, as well as failure to undergo hydrogen removal treatment in a timely manner after electroplating zinc, resulting in fracture
A large number of experiments and long-term practical experience have confirmed the above analysis"