Introducing the selection criteria for fit classifications, length classifications, and internal thread tolerance zone classes!
This technical document covers "fitting length." Typically, the tolerance class of screws is selected considering the "fitting category" and "fitting length." To perform screw machining stably, it is necessary to fully understand this relationship and select the appropriate tolerance class for screws. 【Contents】 1. Fitting categories 2. Categories of fitting length 3. Selection criteria for internal and external threads - Selection criteria for internal thread tolerance class - Selection criteria for external thread tolerance class 4. Fitting length *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.