what is screw used for?

Screws vary in use depending on the head shape, groove shape, and thread type. So what is screw used for?

When the cross recess screw is tightened, the neutrality is good, the automatic assembly is easy, the productivity is high, the strength of the groove is high, and it is not easy to slip.

Slotted screws, mostly used for the joining of smaller parts.

The countersunk head hexagon socket can withstand large tightening torques and has high joint strength and can replace hex head bolts. The head can be buried in the counterbore of the part, and the shape is smooth and compact.

The cylinder head hexagon socket is the most widely used of all screws. Because it has a large fastening force, it can be operated with an Allen key. It is very convenient to install. It is used in almost all kinds of structures. The appearance is beautiful and neat. The disadvantage is that The tightening force is lower than the outer hexagon, and it is easy to damage the inner hexagon due to repeated use, which makes it impossible to disassemble.

Pan head hexagon socket – mechanically seldom used, mechanical properties are the same as above, mostly used in furniture, the main role is to increase the contact surface with wooden materials and increase the ornamental appearance.

Ordinary hex head – widely used, characterized by relatively large fastening force, the disadvantage is that there must be enough operating space when installing, you can use a spanner or open end wrench when installing, or the wrench above the glasses wrench needs a lot of Operating space.

Set screw: what is screw used for?

The cone point set screw is used to directly tighten the parts by the end, which is generally used in occasions where the parts are not frequently disassembled or the hardness of the parts is not high.

The flat point set screw has a flat end and the end is smooth, so it does not hurt the surface of the part. It is often used for occasions where the load is small and the position is often adjusted.

The cup point set screw, suitable for occasions where the hardness of the part is large.

The half-dog set screw has high carrying capacity and is used for parts that are frequently adjusted or fixedly mounted on the tube shaft. There should be anti-loose measures when using.

The oval point set screw can be pressed into the round of the part in addition to the flat top surface.

The hardness of the set screw is higher than the hardness of the part. Generally, the heat treatment hardness of the screw is 28-38HRC.

The main function of the shoulder screw is to position it, but it can transmit a small load.

The waisted shank screw is often used for the connection with large impact vibration and no escape. A retaining element can be attached to the thin screw.

Self tapping screws are often used for the joining of thinner steel sheets and non-ferrous metal sheets. The hardness of the screw is high, and the heat treatment hardness is generally 50-58HRC. The coupled member may not be pre-formed with a thread, and when engaged, the screw is used to tap the thread.

Special screws are often used for the connection of less loaded tooling equipment.

Precision mechanical fasteners Phillips screws are mainly used in precision machinery such as instruments and meters.

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