Download or read book GB/T 972-2008 Translated English of Chinese Standard (GB/T 972-2008, GB/T 972-2008) written by https://www.chinesestandard.net and published by https://www.chinesestandard.net. This book was released on 2023-03-07 with total page 12 pages. Available in PDF, EPUB and Kindle. Book excerpt: This Standard stipulates the basic requirements for the type and size, profile size and deviation, technical requirements, marking and packaging of thread rolling flat dies for general purpose metric screw threads. This Standard applies to thread rolling flat dies for processing general purpose metric screw threads (GB/T 192~193, GB/T 196~197). Thread rolling flat dies are divided into three precision grades: grade 1, grade 2 and grade 3. Grade 1 applies to the processing of external threads with tolerance grades 4 and 5; grade 2 applies to the processing of external threads with tolerance grades 5 and 6; grade 3 applies to the processing of external threads with tolerance grades 6 and 7.