GB/T 4459.5-1999: Mechanical drawings. Representation of centre holes

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Scope

This Standard specifies the representation of centre holes.
This Standard applies to standardized centre holes when it is not necessary to
show the exact form and structure in mechanical drawings. Centre holes other
than standardized centre holes may also refer to this Standard.

Basic Data

Standard ID	GB/T 4459.5-1999 (GB/T4459.5-1999)
Description (Translated English)	Mechanical drawings. Representation of centre holes
Sector / Industry	National Standard (Recommended)
Classification of Chinese Standard	J04
Classification of International Standard	01.100.30
Word Count Estimation	7,750
Date of Issue	9/3/1999
Date of Implementation	3/1/2000
Older Standard (superseded by this standard)	GB/T 4459.5-1984
Quoted Standard	GB/T 145-1985; GB/T 10609.4-1989; GB/T 14691-1993; GB/T 17450-1998
Adopted Standard	ISO 6411-1982, MOD
Issuing agency(ies)	State Quality and Technical Supervision
Summary	This standard specifies the representation of the center hole. This standard applies to the standard does not require showing exactly the shape and structure of the central hole in the mechanical drawings. Can also refer to non-standard uses a central hole.