[Technical Data] Relationship between Screw Grade and Fit Length
Selecting the appropriate grade and effectively utilizing tolerances leads to stable processing.
I will introduce the relationship between "screw grade and fit length." The grade of a screw is determined by the relationship between the "fit classification" and the "fit length." Since the screw grade indicates the position of the tolerance, selecting the appropriate grade and effectively utilizing the tolerance leads to stable processing. 【Examples of Fit Classification Application】 ■ Precision - Especially for precision screws with minimal play ■ Medium - General-purpose screws used in machinery, instruments, structures, etc. ■ Coarse - Screws used in environments prone to dirt and scratches, such as in construction work and installation, or screws that are difficult to process, like those threaded onto hot-rolled bars or those threaded into long blind holes. *For more details, please refer to the PDF document or feel free to contact us.
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【Fit Length Classification】 <Symbol/Fit Length Classification/Classification Limit Dimensions> ■S/Short Fit Length/2.24Pd0.2 or less ■M/Standard Fit Length/Exceeding 2.24Pd0.2 and up to 6.7Pd0.2 ■L/Long Fit Length/Exceeding 6.7Pd0.2 *For more details, please refer to the PDF document or feel free to contact us.
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For more details, please refer to the PDF document or feel free to contact us.
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Since our founding in 1923, the YAMAWA Group has been dedicated to researching and developing the highest quality cutting tools—such as taps, dies, and center drills—to meet the ever-evolving technological needs of the market. Guided by the founding spirit of contributing to the progress and development of Japan’s machinery industry, we continue to pursue excellence as specialists in cutting tools. YAMAWA products are trusted across a wide range of industries, from space exploration and aerospace to automotive, shipbuilding, machine tools, home appliances, and IT-related sectors—both in Japan and worldwide. Staying true to our philosophy of providing “Reliable Screw Threads”, we constantly refine our technology and quality management systems. As Japan’s first tap manufacturer to obtain ISO 9001 certification, we take pride in our heritage while striving to advance innovation and deliver cutting tools that support manufacturing around the world.