Fasteners are a class of mechanical parts that are used for fastening connections and are widely used. Fasteners are widely used in industries including energy, electronics, electrical appliances, machinery, chemicals, metallurgy, molds, hydraulics, etc., in various machinery, equipment, vehicles, ships, railways, bridges, buildings, structures, tools, and instruments You can see all kinds of fasteners on the top, chemical industry, instruments and supplies, which are the most widely used mechanical basic parts. It is characterized by a large variety of specifications, different performance and use, and the degree of standardization, serialization, and generalization is extremely high. Therefore, some people also refer to a class of fasteners that have national standards as standard fasteners, or simply as standard components.
Custom carbon steel fasteners supplier introduces you the selection and precautions of several common fasteners.
The quality of a combination screw must start with the screw wire of the combination screw. The wire of the screw is the first key to determine the quality of the combined screw. The wire is not good. Even if the production equipment is advanced and the staff is skilled, they can not produce high quality fasteners.
In the second look, the quality of the combination screw is viewed from the overall aesthetics of the combination screw. A combination screw has been formed. The size of the head of the screw, the superior appearance of the flat washer, whether the screw thread can pass through the stop gauge and so on. These need to be detected. A good combination screw can meet the national standard requirements or customer requirements.
High Quality Fasteners
Finally, the quality of the combination screw products is viewed from the plating color. Of course, iron combination screws need to be plated, but stainless steel combination screws are not required. Most of them are passivation, in order to increase the salt spray resistance of stainless steel combination screws. On the plating color of the combination screws, some are not well controlled, which will cause a large color difference. This won't look good.
Carbon steel fasteners construction should be noted
1, quality matters needing attention
(1) Surface rust, oil stains, burrs on the wall of bolt holes, and welding knobs should be cleaned up.
(2) After contacting the friction surface, the required anti-scratch coefficient must be met. The high-strength bolts used should have matching nuts and washers. When used, they should be used in accordance with the matching and must not be interchanged.
(3) Oily soil, dirt and other sundries are not allowed during the installation of the friction surface of the treated components.
(4) The friction surface of the component should be kept dry during installation and should not be operated in the rain.
(5) Strictly check and correct the deformation of the connected steel plates before installation.
(6) Do not hammer into the bolt during installation to prevent damage to the bolt thread.
(7) Electric wrenches that are regularly inspected during use to ensure the accuracy of the torque and operate in the correct tightening sequence.
2. Main safety technical measures
(1) The size of the spanner of the adjustable wrench should match the size of the nut, and a small wrench should not be used to add a sleeve. A dead spanner should be used for high-altitude operations. If you use a spanner to fasten it with a rope, you should fasten your seat belt.
(2) When assembling the connecting bolts of steel members, it is strictly forbidden to insert the connecting surface by hand or explore the screw holes. When placing and placing the shim plate, fingers should be placed on both sides of the shim plate.