Slotted and cross-slotted screws can be seen everywhere in life. In contrast, the inner and outer hexagons are also very common. In addition, there are many other styles of drive slots.

Briefly talk about a few of the more common groove types:

① Cross groove: It is more common in households. Use a Phillips screwdriver for disassembly and assembly. The advantage is that it is easier to apply force than the one-word type. The disadvantage is that the tooth is slippery (the groove is damaged).

② Adding and subtracting slots: It is more common for household use. Use a cross or flat-blade screwdriver to disassemble and assemble. The advantage is that it is highly versatile and has no obvious disadvantages (I don't know if the cost is high)

③ Slotted slot: It is common for household use. Use a slotted screwdriver for disassembly and assembly. The advantage is that the slot is slightly damaged. You can use a simple tool to deepen the slot. The disadvantage is that it is not easy to apply force.

④ Inner triangular slot: generally used for household electrical products, use triangular keys for disassembly and assembly, the advantage is to protect the personal safety of electrical products and users (not let non-professionals without keys open), no obvious disadvantages

⑤ Hexagon socket: mechanical products are more commonly used. Use hexagon wrench for disassembly and assembly. The advantage is that it is highly versatile (in the machinery industry) and there are no obvious disadvantages.

⑥ Torx slot: For mechanical and electrical products, use a Torx wrench to disassemble and assemble. The advantage is to protect the personal safety of electrical products and workers (non-professionals without special wrenches are not allowed to open), no obvious disadvantages

In summary, the flat head and cross head are common in self-tapping screws, and the torque required for tightening with the corresponding screwdriver is not large, and a slightly larger torque will twist. The inner and outer hexagon heads are more common in bolts. They are used in the occasions where the imprisonment torque is large. The outer hexagonal bolts need to be tightened with a plate wrench or a set of wrenches. The inner hexagonal bolts need to be tightened with a hexagonal wrench. The head will not be twisted.