Understanding the Basics of Screws: A Textbook on Screws Learned from the Ground Up

Do you know about the performance evaluation of screws? Screws are often perceived as standard products, but many of the precision screws we handle are developed through various performance evaluations based on customer requirements. Screws are fastening components that significantly impact the strength of mechanical structures. Loosening or breaking of screws can lead to major accidents. The performance evaluation of screws includes many items, such as the unique "axial force," "loosening," and "tensile strength," as well as the screw's own "durability," "mechanical strength," and "fatigue strength." Our company is equipped with testing facilities to conduct evaluations for each of these performance aspects. We have summarized the types of equipment we use for performance evaluation. Each test is explained with photos, detailing the overview of the testing machines, as well as the purpose and content of the tests. Some of the testing machines have been developed in collaboration with academic institutions. *Specific examples of tightening tests and delayed fracture tests have been added. Please take a look at the performance evaluations accumulated by Daiichi Kogyo Co., Ltd. as a total fastener manufacturer. Feel free to contact us with any inquiries.

"Fastening" means to "connect" things together. Daiichi Kogyo is a "specialized group of fastening components." We have renewed our website. We have newly launched the Bolt and Screw Division site, the "Fastening Components Sales Site." With our four strengths: "Technical Development Capability," "Production Technology Capability / Manufacturing Technology Capability," "Quality Control Capability," "Procurement Capability," we will meet our customers' fastening needs. On the Bolt and Screw Division site, you can download technical materials on "Screw Performance Evaluation." You can also download technical materials on "Screw Manufacturing Methods." You can also find basic knowledge about screws in the "Useful Information about Screws" section. We introduce products by "Category" and "Function." Please take a look through the link.

We are currently offering a free copy of "Textbook on Screws Vol. 3 [Loosening and Countermeasures]," which summarizes the basic knowledge of screws (looseness of screws) in an easy-to-understand manner. Do you know about the "loosening" of screws? Screws are used in various machines and architectural structures, but they can unexpectedly loosen due to external forces or vibrations. When screws loosen, it can lead to serious accidents, such as malfunctioning, disassembly, or destruction of mechanical structures. Therefore, preventing loosening is an important issue for ensuring the reliability of the strength and performance of screw joints. This document explains the basics of screw "loosening," including the types of loosening, prevention measures, and testing methods for loosening resistance, using diagrams for clarity. Please take a look. [Contents] ◆ Mechanism of loosening ◆ Types of loosening (rotational loosening and non-rotational loosening) ◆ Prevention measures for loosening ◆ Measurement methods for loosening resistance