To prevent breakage from the valley bottom, increase the diameter of the valley and define the range of the valley bottom radius.
This technical document provides information about Unified screws used for aircraft, specifically "UNJ screws." It details the features of UNJ screws, standard thread profiles, and screw pilot hole diameters, offering a comprehensive overview of the product. [Contents] - Features of UNJ screws - Standard thread profiles of UNJ screws - Screw pilot hole diameters *For more details, please refer to the PDF document or feel free to contact us.
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【Pilot Hole Diameter (Partial)】 <Designation: No.6-32UNJC> ■ Valley Diameter ・ Maximum: 2.938 ・ Minimum: 2.734 ■ Pilot Hole Diameter: 2.89 <Designation: No.6-40UNJF> ■ Valley Diameter ・ Maximum: 3.053 ・ Minimum: 2.888 ■ Pilot Hole Diameter: 3.01 *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.