Published in a table are the internal diameters of metric screw threads and unified screw threads, as well as the diameters of the screw clearance holes!
This document introduces the drill hole diameters for cutting taps. In addition to the drill hole diameters, it also includes a table showing the maximum and minimum values for internal thread diameters. Please take a look to ensure you can process "reliable threads." 【Contents】 ■ For metric threads ■ For unified threads ■ For whitworth threads ■ For parallel pipe threads (Rp) ■ For parallel pipe threads (PS) ■ For parallel pipe threads (PF・G) ■ For tapered pipe threads (PT・Rc) ■ For insert coil metric threads ■ For insert coil unified threads *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.