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GB/T 4459.5-1999 PDF English

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

Standard IDUSDBUY PDFDeliveryStandard Title (Description)Status
GB/T 4459.5-1999100 Add to Cart Auto, 9 seconds. Mechanical drawings. Representation of centre holes  
GB/T 4459.5-1984199 Add to Cart 2 days Mechanical drawings--Simplified representation of centre holes Obsolete

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

---This is an excerpt. Full copy of true-PDF in English version (including equations, symbols, images, flow-chart, tables, and figures etc.), auto-downloaded/delivered in 9 seconds, can be purchased online: https://www.ChineseStandard.net/PDF.aspx/GBT4459.5-1999
NATIONAL STANDARD OF THE PEOPLE’S REPUBLIC OF CHINA ICS 01.100.30 J 04 eqv ISO 6411:1982 Replacing GB/T 4459.5-1984 Mechanical drawings - Representation of centre holes ISSUED ON: SEPTEMBER 03, 1999 IMPLEMENTED ON: MARCH 01, 2000 Issued by: State Bureau of Quality and Technical Supervision

Table of Contents

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 Annex A (informative) Relevant dimensions on drawings for type R, A, B and C centre holes ... 10 Annex B (Informative) Proportions and dimensions of symbols of centres holes ... 11 Forward This Standard is drafted in accordance with ISO 6411:1982 “Technical drawings - Simplified representation of centre holes”. It is equivalent to the international standard. This Standard revises and replaces GB/T 4459.5-1984 “Mechanical drawings - Representation of centre holes”, which makes the representation of centre holes consistent with that in the international standard, to meet the needs of international trade, technology and economic exchanges. The representation of centre holes is a special representation in mechanical drawings. This Standard supplements the following main contents as needed: 1. ADD the designation and representation of type C centre holes. 2. ADD the simplified representation, omitting the standard code in the designation of centre holes. 3. For the convenience of selection, the parameter code in Table A1 of Annex A adopts the provisions of GB/T 145, that is, D replaces the pilot diameter d specified in ISO 6411, D1 replaces the tapered hole’s end face diameter D1 (type R), D2 (type A) and D3 (type B) specified in ISO 6411. Annex A and Annex B of this Standard are informative annex. This Standard was proposed by State Bureau of Machinery Industry. This Standard shall be under the jurisdiction of National Technical Committee on Technical Drawings of Standardization Administration of China. Drafting organizations of this Standard: Machinery Standardization Institute, Chongqing Machine Manufacturing School, Dalian Bohai Riping Machine Tool Co., Ltd. Main drafters of this Standard: Qiang Yi, Yang Dongbai, Chen Shuguo, Hou Ying, Huang Ju, Lai Jianguo. Mechanical drawings - Representation of centre holes

1 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.

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 ......
Source: Above contents are excerpted from the full-copy PDF -- translated/reviewed by: www.ChineseStandard.net / Wayne Zheng et al.
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