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.
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【Other Published Content】 ■Chapter 2 Main Materials and Processing Methods of Fasteners - Main Materials: About Steel Materials *For more details, please refer to the PDF document or feel free to contact us.
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Yura Sangyo's Special Sales Department aims to contribute to the screw demand industry by ensuring that we can deliver "better screws" at "more reasonable prices" and "just in time" through our wholesale operations of screws and related products. We strive to perfect our various business activities to achieve this goal. 1. Abundant inventory: Over 50,000 items with more than 10,000 tons of stock. 2. Wide range of suppliers: Partnering with 250 domestic and international suppliers, including SPS Unbrako, which specializes in the aerospace sector. 3. Robust immediate delivery system: Quickly responding to customer needs from small lot orders. 4. Reliable quality control: Conducting thorough inspections and traceability from product arrival to delivery in a separate department from the wholesale division, we also handle engineering fasteners (bolts and nuts) based on customer advice and needs. Our product lineup and business details are as follows. We primarily focus on made-to-order production and also handle some branded products from the wholesale division.