1 Application Scope
This national standard is applicable to the elements which formed in the method of dividing materials, and applicable to the elements formed in other method. It is suitable to determine the manufacturing accuracy for this department at the time of using, and make sure the manufacturing accuracy is in the tolerance value without individual indication specified in this standard.
2 Informative references
The following standards contain provisions which, through reference in this text, constitute provisions of this standard. At time of publication, the editions indicated were valid. All standards are subject to revision, and parties to agreements based on this standard are encouraged to investigate the possibility of applying the most recent editions of the standards indicated below:
GB/T1182-1996 Geometrical Tolerancing - Generalities, Definitions, Synbiks, Indications on drawings GB/T1804-92 General Tolerances - Tolerances for Linear Dimensions without Individual Tolerance Indications
GB/T4249-1996 Tolerancing Principle
3. Definition
This standard adopts definitions given in GB/T1182.
4. General rule The tolerance class specified in this standard was considered with the general manufacturing accuracy of all kinds of factories. For instance, when a higher tolerance requirement is put forward for a certain element owing to functional requirements, it is suitable to label directly on the drawing according to the requirements in GB/T1182; the wider tolerance requirement is required to give clear indication only if it is beneficial to the factory economy. If the form and position tolerance without individual indications specified in this standard is adopted in drawings or related documents, it is suitable to label according to the requirements of Chapter 6 of this standard, it is applicable to all elements of form and position tolerance without separate label.
