Basic Knowledge of Screws: About Screw Standards

We are providing a reference document summarizing the history of screws, the precision of metric screws, and the methods of expressing the finishing levels of screw components, along with the standards for screws.

This document includes the history of screws, "The Journey to International Standardization" and "The Journey to Standardization in Our Country," as well as screw standards such as "How to Express the Precision of Metric Screws" and "How to Express the Finish Level of Screw Parts." It introduces events in chronological order, such as the establishment of the "Japanese Industrial Standards (JIS) in 1921" and the "First Metric Screw established as JIS Standard No. 13 in 1924 (Metric Coarse Thread Screw)." Additionally, it explains "Main Materials and Processing Methods for Screws." We encourage you to read it. 【Contents (Partial)】 ■ Chapter 1 About Screw Standards - The Journey to International Standardization - The Journey to Standardization in Our Country - How to Express the Precision of Metric Screws - How to Express the Finish Level of Screw Parts - Main Standards and Annex Standards *For more details, please refer to the PDF document or feel free to contact us.

Joints between components