Knowledge bag for when you're in trouble: Recommended tap grade for Unify 3B class male threads.
Resolving common questions and concerns about screws! Cutting tap edition.
YAMAWA will respond to inquiries received from customers. This document includes detailed explanations as well. 【Contents】 ■Inquiry We are planning to undertake work on aircraft components, specifically tapping UNJ threads of 1/4-28UNJF and 5/16-24UNJF. I understand that by using taps for Unified threads, 1/4-28UNF and 5/16-24UNF, which can process 3B class threads, and adjusting the pilot hole diameter to the specified inner diameter dimensions, we can process UNJF threads. However, what is the recommended grade for taps that can process 3B class threads? *For more details, please refer to the PDF document at the link below.
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basic information
【Other Published Content】 ■Response ■Explanation ■Materials ・Recommended grades for ANSI standard Unified external threads 3B class processing taps (excerpt) *For more details, please refer to the PDF materials 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.
Company information
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.
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