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GB/T 4459.5-1999Mechanical drawings. Representation of centre holes (English PDF)

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Issued by

State Bureau of Quality and Technical Supervision

Level / Type

National · Recommended

Issue date

September 3, 1999

Implementation date

March 1, 2000

Scope

GB/T 4459.5-1999 (Mechanical drawings. Representation of centre holes) is available as an English-translated PDF.

GB/T 4459.5-1999 is the Chinese standard "Mechanical drawings. Representation of centre holes". Its scope clause reads: 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.

Its clauses include references; symbols of centre holes. It was issued by the State Bureau of Quality and Technical Supervision on 1999-09-03 and took effect on 2000-03-01.

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Document preview — GB/T 4459.5-1999

National Standard of the People's Republic of China

ICS: 01.100.30
Classification: J 04

Issued by: State Bureau of Quality and Technical Supervision

Forward...3
ISO Foreword...4
1 Scope...5
2 References...5
3 Symbols of centre holes...5
4 Designation of centre holes...6
5 Representation of centre holes...8

1 Scope

This Standard specifies the representation of centre holes.

2 References

The following standards contain provisions which, through reference in this

Standard, constitute provisions of this Standard. At the time of publication, the editions indicated are valid. All standards are subject to revision. The parties who are using this Standard shall explore the possibility of using the latest version of the following standards.

GB/T 145-1985 Center holes (validated in 1999)

GB/T 10609.4-1989 Technical drawings - Requirements for microcopying (validated in 1999)

GB/T 14691-1993 Technical drawings - Lettering

GB/T 17450-1998 Technical drawings - Basic conventions for lines

3 Symbols of centre holes

3.1 Requirements

On technical drawings, generally there are three different requirements on whether centre holes are remained in the finished part:

a) centre hole is required on the finished part;

b) centre hole may remain on the finished part;

c) centre hole shall not exist on the finished part.

3.2 Symbols

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This preview omits tables, figures, formulas and parts of the technical clauses. The complete document — 8 pages — is available in the English PDF.

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