GB/T 1804-2000 PDF EnglishUS$70.00 · In stock · Download in 9 seconds
GB/T 1804-2000: General tolerances - Tolerances for linear and angular dimensions without individual tolerance indications Delivery: 9 seconds. True-PDF full-copy in English & invoice will be downloaded + auto-delivered via email. See step-by-step procedure GB/T 1804: Historical versions
GB/T 1804-2000: General tolerances - Tolerances for linear and angular dimensions without individual tolerance indications---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/GBT1804-2000 GB NATIONAL STANDARD OF THE PEOPLE’S REPUBLIC OF CHINA ICS 17.040.10 J 04 eqv ISO 2768-1.1989 General tolerances - Tolerances for linear and angular dimensions without individual tolerance indications 一般公差 Issued on. JULY 24, 2000 Implemented on. DECEMBER 1, 2000 Issued by. State Bureau of Quality and Technical Supervision Table of ContentsForeword... 3 ISO Foreword... 4 1 Scope... 5 2 Normative references... 5 3 Definitions... 6 4 General principles... 6 5 Tolerance class and limit deviations of general tolerances... 7 6 Method for general tolerance indication on drawings... 8 7 Determination... 8 Annex A (Informative) Concepts behind general tolerance of linear and angular dimensions... 9ForewordThis Standard is formulated through amendment made to GB/T 1804-1992 “General tolerance - Tolerances for linear and angular dimensions without individual tolerance indications” and GB/T 11335-1989 “Limit deviations of angle without tolerance indication” according to the international standard ISO 2768-1.1989 “General tolerance - Part 1.Tolerances for linear and angular dimensions without individual tolerance indications”. It shall be technically equivalent to this Standard. In this way, it shall enable the general tolerance standard for dimensions without individual tolerance indications of China to be as identical or equivalent to the international standard as possible, so as to adapt to the international trade, technological and economic exchanges, as well as the demands for adoption of international standards for rapid development. In comparison with the original GB/T 1804 and GB/T 11335, this Standard has added 4 clauses, namely normative reference, definitions, general principles and determination, and also changed the title of the standard. This Standard has replaced GB/T 1804-1992 and GB/T 11335-1989 from the date of implement. Annex A of this Standard is an informative annex. This Standard is proposed by State Bureau of Machine Building Industry. This Standard shall be under the jurisdiction of National Technical Committee of Standardization for Geometrical Production Specification and Verification. Drafting organization of this Standard. Mechanical Engineering Research Institute. Main drafters of this Standard. Li Xiaopei and Yu Hanqing.1 ScopeThis Standard specifies tolerance classes and limit deviations of general tolerances for linear and angular dimensions without individual tolerance indications. This Standard applies to the dimensions of parts that are produced by metal removal, it also applies to the dimensions of parts that are formed from sheet metal. The dimensions of non-mental materials or other process method may also reference to this Standard. This Standard only applies for the following dimensions which do not have an individual tolerance indication. a) linear dimensions (e.g. external sizes, internal sizes, step sizes, diameters, radius, distances, rounding radius and chamfer heights); b) angular dimensions, including angular dimensions usually not indicated, e.g. right angles (90°); excluding the angles as mentioned in GB/T 1184, or angles of uniform polygons; c) linear and angular dimensions produced by machining assembled parts. This Standard does not apply for the following dimensions. a) linear and angular dimensions which are covered by reference to other standards on general tolerances; b) auxiliary dimensions indicated in brackets; c) theoretically exact dimensions indicated in rectangular frames.2 Normative referencesThe following standards contain provisions which, through reference in this text, constitute provisions of this Standard. At the 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/T 1800.1-1997 Limits and fits - Bases - Part 1.Terminology GB/T 1184-1996 Geometrical tolerancing - Geometrical tolerances for features without individual tolerance indications (eqv ISO 2768-2.1989) GB/T 4249-1996 Tolerancing principle (eqv ISO 8015.1985) GB/T 6403.4-1986 Rounding and chamfered of parts3 Definitions3.1 This Standard adopts the relevant terms and definitions given in GB/T 1800.1. 3.2 General tolerances It refers to the tolerances the can be guaranteed under the normal processing conditions in workshops. If the dimensions adopts general tolerances, there is no need to indicate the limit deviations adjacent to such dimensions.4 General principlesWhen selecting the tolerance class of the general tolerance for dimensions without individual tolerance indications on drawings, the respective customary workshop accuracy shall be taken into consideration and the corresponding technical documents or standards shall give specific specifications.5 Tolerance class and limit deviations of general tolerancesGeneral tolerances are divided into 4 classes, namely fine f, medium m, coarse c and very coarse v. Corresponding tolerance class and limit deviation are given according to linear and angular dimensions without individual tolerance indications 5.1 Linear dimensions Table 1 gives the limit deviation of linear dimensions; Table 2 gives the limit deviations of rounding radius and chamfer height. 5.2 Angular dimensions Table 3 gives the limit deviation of angular dimensions, the values of which shall be determined by the short side length of an angle, while that for cone angle it shall be determined by the length of cone generatrix.6 Method for general tolerance indication on drawingsIf general tolerances in accordance with this Standard shall apply, the number of this Standard and the code of tolerance class shall be indicated near the title block on drawings or in technical requirements and technical documents (such as industrial standards). For example, when medium class is selected, it shall be indicated as the following.7 DeterminationUnless otherwise stated, workpieces exceeding the general tolerance shall not lead to automatic rejection provided that the ability of the workpiece to function is not impaired (see clause A.5).Annex A(Informative) Concepts behind general tolerance of linear and angular dimensions A.1 All features on component parts always have a size and a geometrical shape. For the deviation of size and for the deviations of the geometrical characteristics (form, orientation and location) the function of the part requires limitations which, when exceeded, impair this function. Therefore, certain tolerance requirements shall be given when all features on component parts are indicated on drawings. For features having no special requirement for functions, the general tolerances may be given. The general tolerances can be applied in geometrical elements such as linear dimensions, angular dimensions, form and location. For features adopting general tolerances, it is not necessary to indicate the tolerance separately on the drawings, but to give general explanations in the drawings, technical requirements or technical documents (such as industrial standards). A.2 The general tolerances of linear and angular dimensions are the tolerance that can be guaranteed by machine tool equipment under normal process conditions in workshops. Under normal maintenance and operation, it represents the customary processing accuracy of workshops. The tolerance value for the tolerance class of general tolerances shall comply with the customary workshop accuracy. It shall select the corresponding tolerance class according to the service requirements of component parts. The general tolerances of linear dimensions are mainly used for low-accuracy unfitting dimensions. The inspections on the dimensions adopting general tolerances can usually be omitted under the condition that the customary workshop accuracy is guaranteed. A.3 Above certain tolerance values, there is usually no gain in manufacturing economy by enlarging the tolerance. For example, a feature having a 35 mm diameter could be manufactured to a high level of conformance in a workshop with “customary medium accuracy”. Specifying a tolerance of ± 1 mm would be of no benefit in this particular workshop, as the general tolerance values of ± 0.3 mm would be quite adequate. In cases where the function of a feature allows a tolerance equal to or larger than the general tolerance values, it shall adopts general tolerances. Only when the function of the feature allows a larger tolerance than the general tolerances, and the larger tolerance will provide manufacturing economy (e.g. the depth of blind holes drilled at assembly), the corresponding limit deviation shall be indicated individually adjacent to the dimension. However, if, for functional reasons, a feature requires a smaller tolerance value than the “general tolerances”, then corresponding limit deviations shall be indicated individually adjacent to the dimension. This type of tolerance falls outside the scope of general tolerances. A.4 Using general tolerances leads to the following advantages. A.5 The tolerance the function allows is often greater than the general tolerance. The function of the part is, therefore, not always impaired when the general tolerance is (occasionally) exceeded at any feature of the workpiece. Exceeding the general tolerance should lead to a rejection of the workpiece only if the function is impaired. ......Source: Above contents are excerpted from the full-copy PDF -- translated/reviewed by: www.ChineseStandard.net / Wayne Zheng et al. Tips & Frequently Asked Questions:Question 1: How long will the true-PDF of English version of GB/T 1804-2000 be delivered?Answer: The full copy PDF of English version of GB/T 1804-2000 can be downloaded in 9 seconds, and it will also be emailed to you in 9 seconds (double mechanisms to ensure the delivery reliably), with PDF-invoice.Question 2: Can I share the purchased PDF of GB/T 1804-2000_English with my colleagues?Answer: Yes. The purchased PDF of GB/T 1804-2000_English will be deemed to be sold to your employer/organization who actually paid for it, including your colleagues and your employer's intranet.Question 3: Does the price include tax/VAT?Answer: Yes. Our tax invoice, downloaded/delivered in 9 seconds, includes all tax/VAT and complies with 100+ countries' tax regulations (tax exempted in 100+ countries) -- See Avoidance of Double Taxation Agreements (DTAs): List of DTAs signed between Singapore and 100+ countriesQuestion 4: Do you accept my currency other than USD?Answer: Yes. www.ChineseStandard.us -- GB/T 1804-2000 -- Click this link and select your country/currency to pay, the exact amount in your currency will be printed on the invoice. Full PDF will also be downloaded/emailed in 9 seconds.Question 5: Should I purchase the latest version GB/T 1804-2000?Answer: Yes. Unless special scenarios such as technical constraints or academic study, you should always prioritize to purchase the latest version GB/T 1804-2000 even if the enforcement date is in future. Complying with the latest version means that, by default, it also complies with all the earlier versions, technically.How to buy and download a true PDF of English version of GB/T 1804-2000?A step-by-step guide to download PDF of GB/T 1804-2000_EnglishStep 1: Visit website https://www.ChineseStandard.net (Pay in USD), or https://www.ChineseStandard.us (Pay in any currencies such as Euro, KRW, JPY, AUD).Step 2: Search keyword "GB/T 1804-2000". Step 3: Click "Add to Cart". If multiple PDFs are required, repeat steps 2 and 3 to add up to 12 PDFs to cart. Step 4: Select payment option (Via payment agents Stripe or PayPal). Step 5: Customize Tax Invoice -- Fill up your email etc. Step 6: Click "Checkout". Step 7: Make payment by credit card, PayPal, Google Pay etc. After the payment is completed and in 9 seconds, you will receive 2 emails attached with the purchased PDFs and PDF-invoice, respectively. Step 8: Optional -- Go to download PDF. Step 9: Optional -- Click Open/Download PDF to download PDFs and invoice. See screenshots for above steps: Steps 1~3 Steps 4~6 Step 7 Step 8 Step 9 |
