The quality of the raw materials used in stainless steel screws is problematic.

The quality of the stainless steel screw wire is not good. There are many impurities and impurity, which causes the hardness of the stainless steel screw to be insufficient.

The customer uses too much force when using the stainless steel screw.

Generally, you do a torque test to see the minimum breaking force, and then adjust the torque. Process problems in producing stainless steel screws.

For example, stainless steel screws with eccentric heads, and the Q value is too deep and the R position is too small during the undershooting operation during manufacturing.

Stainless steel screws are classified into austenitic stainless steel, ferritic stainless steel, martensitic stainless steel, and precipitation hardening stainless steel.

The pressure riveting screws are made of austenitic stainless steel, which has stronger anti-rust performance than 200 series stainless steel materials.

You must choose a good supplier, and you must choose those companies that can provide material inspection reports and have long-term cooperation experience with Japanese and German companies.

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Choose a stainless steel screw supplier, depending on whether his stainless steel screws can reach foreign developed countries. Requirements.

The important indicator is whether it can cooperate with import and export trading companies for a long time and whether it can be directly exported to European and American countries.

Inspection of thread grinding. Of course, the most important thing for screw friction is the dental plate.

Screw type

It is also a type of fasteners composed of two parts, a head and a screw, which can be divided into three categories according to their uses: machine screws, set screws and special purpose screws.

The machine screw is mainly used for fastening a part with a threaded hole and a fastening connection between a part with a through hole, and does not need a nut to cooperate with the fastening screw is mainly used for fixing the relative position between two parts.

Special purpose screws such as eyebolts are used for lifting parts.

Screw stop loss rules

All the teeth wiped from a good dental board should be able to pass the general stop loss rules, the other is to check the pitch, thread, etc.

It is also necessary to meet the customer requirements of the screw national standard.

Finally, the color of the electroplated screws was checked and a salt spray test was carried out. See if the color of the plated screws is good.

The combination screw refers to a screw with a spring pad and a flat pad by rubbing teeth,

The thickness of the fastened part is less than the height of the head of the countersunk screw, which is common in sheet metal parts in mechanical equipment.

Such as the connection of the hinge of the chassis and the door and the box; the connection of the sheet metal cover of the equipment and the equipment, etc.

Due to the small thickness of the part, the screw through hole of the fastened sheet metal part is completely a conical hole.

In this case, when the countersunk screw is tightened, the screw head is not a conical surface to compress the sheet metal part .