Embedded screws (or embedded bolts) are screws that are integrated with washers. This type of screw is designed to improve work efficiency by eliminating the need to separately prepare or install washers during fastening.

Overview of Embedded Screws

Features and Main Applications

Embedded screws are small screws or bolts pre-assembled with washers. *Washers are used to prevent screws from loosening and to avoid sinking of the seating surface due to tightening pressure. Since washers are assembled before threading the screw, there is no need to insert the washer during tightening, preventing washer loss or installation omission and improving work efficiency. Additionally, the inner diameter of the assembled washer is smaller than the screw thread diameter (outer diameter), ensuring that the washer does not fall off after threading.

Main Materials and Manufacturing Methods

There are two main manufacturing methods for screws: “cutting,” which creates threads by machining, and “rolling,” which forms threads by applying pressure. In this process, simply attaching a washer is not enough, and specialized machines for assembling washers are required.

The Role of Embedded Screws

Role in Assembly

The primary purpose of embedded screws is similar to the use of washers: preventing loosening and avoiding sinking of the seating surface. A significant feature is the added improvement in work efficiency. For instance, using flat washers increases the contact surface area compared to fastening with screws alone. This results in greater friction, providing a stronger anti-loosening effect.

Types of Embedded Screws

There are various types of embedded screws to match different kinds of washers (W=Washer). This section is omitted, but there are examples such as P=1, P=2, etc. A single washer assembly is called a single SEMS, and a double washer assembly is called a double SEMS. Therefore, when selecting embedded screws, it is necessary to choose a type based on the purpose and specify screw diameter, shaft length, etc.

Conclusion

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