JB/T 12605.2-2021Nut-rotating ball screw assemblies - Part 2: Testing of the accuracy (English PDF)

3 Terms and definitions

4 Type and accuracy grades

5 Marking symbols

6 Accuracy inspection

Foreword

This document was issued on 2 December 2021 by the Ministry of Industry and Information Technology of the People's Republic of China, and has been in force since 1 April 2022.

It is the first edition of this standard.

The document is under the responsibility of the Ministry of Industry and Information Technology.

About this edition

JB/T 12605.2-2021 is the first edition of this standard. It was issued on 2 December 2021 and has been in force since 1 April 2022.

There is no earlier edition to compare it with, so a specification that has to refer to this subject can only cite JB/T 12605.2-2021 itself.

The interval between issue and effect is the transition period. It exists so that producers, laboratories and buyers can requalify products, revise procedures and use up documentation before the new text becomes the one that applies. The date on this page is the official one announced by the Ministry of Industry and Information Technology of the People's Republic of China.

Edition history and citation

JB/T 12605.2-2021 is a first edition: there is no earlier version of this standard, so a document that needs to refer to this subject can only cite JB/T 12605.2-2021 itself.

Where an edition is replaced, the Chinese standardization system keeps the number and changes the year: the number identifies the subject, the year identifies the text. That is why a citation without a year is ambiguous and a citation with one is not.

Classification and status

JB/T 12605.2-2021 carries no ICS number in the official record.

The JB/T prefix marks a recommended standard of China's machinery industry, issued by the Ministry of Industry and Information Technology. It is not, in itself, law: it becomes binding when a contract names it, when a regulation or a mandatory standard refers to it, or when a producer declares conformity with it.

The document is under the responsibility of the Ministry of Industry and Information Technology, which is the body that maintains it and that will answer a formal question about its interpretation.

How this standard is designated

The full designation is JB/T 12605.2-2021. A citation should carry the number with its year, because the year identifies the text that applies.