What to pay attention to when buying special screws

In life, special screws have been widely used, especially the advantages of special screws, which have developed rapidly in the market and are deeply loved by consumers. So what should be paid attention to when buying special screws?

1. Product quality of special screws: clean up surface rust, oil stains, burrs on nut hole wall, weld bead, etc.; The treated contact friction surface shall meet the specified scratch resistance coefficient requirements. The high-strength hot-dip galvanized bolts used shall have matching bolts and washers, which shall be used according to matching requirements and shall not be interchanged. During installation, the friction surface of the treated parts shall not be stained with oil, soil and other sundries. During installation, the friction surface of the parts shall be kept dry and shall not be operated in rain. Before installation, strictly check and correct the deformation of the connecting steel plate. Hammering the nut is strictly prohibited during installation, so as to avoid damaging the nut thread; check the electric wrench regularly during use to ensure the accuracy of torque and follow the correct tightening sequence.

2. Installation safety technology: The size of the wrench opening for the adjustable wrench should be consistent with the size of the nut, and the small wrench should not be added with a sleeve. A fixed wrench shall be used for high altitude operation. When using the live wrench, fix it with a rope and fasten the safety belt; when assembling the connecting bolts of steel members, it is forbidden to insert the connecting surface or probe the screw hole by hand. When picking and placing the pad, the fingers should be placed on both sides of the pad. Attention should be paid to the above problems during the construction of special screws to avoid some unnecessary troubles.

Specific use advantages of special screws:

1. Because its surface is specially treated, the appearance is relatively smooth, the surface is relatively smooth, it is not easy to produce burrs, and it presents silver-white characteristics. In production, its thickness should be controlled within a certain range for proper selection.

2. Excellent performance, good tensile properties, not easy to break, and not affected by temperature during use, ensuring its mechanical properties.

3. Galvanized bolts have excellent corrosion resistance, so they have good availability and strong sealing. Generally speaking, they are not easy to loosen.

Special screws are divided into ordinary special screws and special screws with reamed holes. According to the shape of the head: hexagonal, round, square, countersunk, etc. One of the commonly used is the hexagonal head. Special screw countersunk heads are usually used where connections are required. It is a U-shaped non-standard part, so it is also called a U-bolt. The ends of the special screw have a combinable thread and nut. Mainly used for fixing tubular or sheet objects. It is called a riding bolt because it secures objects in the same way that a person rides a horse.

From the introduction of the above content, we can conclude that when buying special screws, we should not only look at their appearance, but also pay attention to their inherent use value and use function.