GB/T 972-2008: Thread rolling flat dies

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Scope

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.

Basic Data

Standard ID	GB/T 972-2008 (GB/T972-2008)
Description (Translated English)	Thread rolling flat dies
Sector / Industry	National Standard (Recommended)
Classification of Chinese Standard	J41
Classification of International Standard	25.100.50
Word Count Estimation	10,196
Date of Issue	2008-06-03
Date of Implementation	2009-01-01
Older Standard (superseded by this standard)	GB/T 972-1994
Quoted Standard	GB/T 192; GB/T 193; GB/T 196; GB/T 197
Regulation (derived from)	National Standard Approval Announcement 2008 No.9 (Total No.122)
Issuing agency(ies)	General Administration of Quality Supervision, Inspection and Quarantine of the People's Republic of China, Standardization Administration of the People's Republic of China
Summary	This standard specifies the common thread for thread rolling plate type size, basic requirements for marking and packaging, etc., tooth- size and bias, technical requirements. This standard applies to processing the common thread (GB/T 192 ~ 193, GB/T 196 ~ 197) of Roll plate. Roll plate into three Accuracy class: 1, 2 and 3. A suitable machining tolerance class 4, external thread 5 of, 2 suitable for machining tolerance class 5, external thread class 6, 3 suitable for machining tolerance class 6, external thread 7 of.