M4 M5 M6 Carbon Gal Steel B7 Phillips Drive Hex Socket Truss Screw

The tail of the screw is generally shown as the shape of drilling tail. The hardness of this screw is very strong, compared with ordinary screws, not only the ability to maintain better, but the effect of connecting the object is very firm. For this performance of the screw, generally no auxiliary processing is needed. You can directly drill a hole on the object to lock it, which is not only very convenient to use but can also greatly improve work efficiency. This kind of drilling screw can be said to be the first choice of staff in various fields.

The main purpose is to make industrial products composed of a fixed body. In use, teeth and teeth often cannot be close, too hard to lock the screw head is broken, or poor dental lock is not tight and fails to meet the conditions of use - these are precision problems. Screws are "quantity products", not hand-made artworks. In mass production, the goal is to achieve high precision, stable quality and popular price supply to consumers.

The values of 4.8 and 8.8 are classified by performance. The higher the value, the better the performance. The differences between grade 4.8 and grade 8.8 bolts are as follows:

• Grade 4.8 is generally called common bolts, while grade 8.8 is called high-strength bolts.
• 8.8 grade bolts are made of low-carbon alloy steel or medium carbon steel and have undergone heat treatment (quenching, tempering), while 4.8 grade bolts are not.
• 4.8 grade bolts are made of unprocessed round steel, with less precise dimensions. They deform significantly during shear connections but are easy to install and have low production cost. They are mostly used for tensile connections or temporary fixation during installation.
• The bolt rods of grade 8.8 bolts are processed by lathes, with smooth surfaces, precise dimensions, complex manufacturing and installation, and relatively high prices. They are rarely used.

Bolts are classified into eight grades according to their performance: 3.6, 4.8, 5.6, 5.8, 8.8, 9.8, 10.9 and 12.9.

If you have another question, please feel free to contact us.