HOME   Cart(0)   Quotation   About-Us Policy PDFs Standard-List
www.ChineseStandard.net Database: 189759 (19 Oct 2025)

GB/T 4251-2008 English PDF

US$229.00 · In stock
Delivery: <= 3 days. True-PDF full-copy in English will be manually translated and delivered via email.
GB/T 4251-2008: Machine reamers with carbide tips
Status: Valid

GB/T 4251: Evolution and historical versions

Standard IDContents [version]USDSTEP2[PDF] delivered inStandard Title (Description)StatusPDF
GB/T 4251-2008English229 Add to Cart 3 days [Need to translate] Machine reamers with carbide tips Valid GB/T 4251-2008
GB/T 4251-2004English279 Add to Cart 3 days [Need to translate] Machine reamers with parallel shanks with carbide tips Obsolete GB/T 4251-2004
GB/T 4251-2003EnglishRFQ ASK 3 days [Need to translate] Machine reamers with parallel shanks with carbide tips GB/T 4251-2003
GB/T 4251-1984English199 Add to Cart 2 days [Need to translate] Machine reamers with parallel shanks with carbide tips Obsolete GB/T 4251-1984

PDF similar to GB/T 4251-2008


Standard similar to GB/T 4251-2008

GB/T 33524.2   GB/T 972   GB/T 5104   GB/T 4256   GB/T 4247   GB/T 4243   

Basic data

Standard ID GB/T 4251-2008 (GB/T4251-2008)
Description (Translated English) Machine reamers with carbide tips
Sector / Industry National Standard (Recommended)
Classification of Chinese Standard J41
Classification of International Standard 25.100.30
Word Count Estimation 10,171
Date of Issue 2008-11-04
Date of Implementation 2009-04-01
Older Standard (superseded by this standard) GB/T 4251-2004; GB/T 4252-2004; GB/T 4253-2004
Quoted Standard GB/T 1443; GB/T 2075; GB/T 4246
Regulation (derived from) National Standard Approval Announcement 2008 No.18 (Total No.131)
Issuing agency(ies) General Administration of Quality Supervision, Inspection and Quarantine of the People's Republic of China, Standardization Administration of the People's Republic of China
Summary This standard specifies the carbide straight shank, Morse taper shank machine type and size of the knife money, position tolerances, material and hardness, appearance and surface roughness, signs and basic requirements for packaging. This standard applies to a diameter greater than 5. 3mm to 20mm carbide straight shank cutter machine with a mirror and a diameter greater than 7. 5mm to 40mm carbide taper shank machine mirror knife.

GB/T 4251-2008: Machine reamers with carbide tips

---This is a DRAFT version for illustration, not a final translation. Full copy of true-PDF in English version (including equations, symbols, images, flow-chart, tables, and figures etc.) will be manually/carefully translated upon your order.
Machine reamers with carbide tips ICS 25.100.30 J41 National Standards of People's Republic of China Replacing GB/T 4251 ~ 4253-2004 Carbide machine reamer Posted 2008-11-04 2009-04-01 implementation Administration of Quality Supervision, Inspection and Quarantine of People's Republic of China Standardization Administration of China released

Foreword

This standard replaces GB/T 4251-2004 "Carbide straight shank machine reamers", GB/T 4252-2004 "Carbide Morse taper shank machine Reamer ", GB/T 4253-2004" carbide reamers - Technical requirements. " This standard and GB/T 4251-2004, GB/T 4252-2004, the main changes compared to the GB/T 4253-2004 as follows. --- The GB/T 4251-2004, GB/T 4252-2004 and GB/T 4253-2004 merged into one standard; --- 5.2.2 hinge on the shank or flat tail section hardness has been modified; 0.15IT "requirements; --- Canceled 3.3 length tolerance of "tolerance" word; --- Table A. Added Note 1; --- Made editorial changes. Appendix A of this standard is a normative appendix. The standard proposed by China Machinery Industry Federation. This standard tool by the National Standardization Technical Committee (SAC/TC91) centralized. This standard was drafted. a Tools Co., Ltd., Henan. The main drafters of this standard. Zhao Jianmin, Kong Chunyan, Fan Yingjie, Wang Zhuo Lin, Dong Xiangyang. This standard replaces the standards previously issued as follows. --- GB 4251-1984, GB/T 4251-2004; --- GB 4252-1984, GB/T 4252-2004; --- GB 4253-1984, GB/T 4253-2004. Carbide machine reamer

1 Scope

This standard specifies the carbide straight shank, Morse taper shank machine reamers types and dimensions, position tolerances, material and hardness, and surface appearance Roughness, signs and packaging the basic requirements. This standard applies to a diameter greater than 5.3mm to 20mm carbide straight shank machine reamers and to a diameter larger than 7.5mm 40mm carbide taper shank machine reamers.

2 Normative references

The following documents contain provisions which, through reference in this standard and become the standard terms. For dated references, subsequent Amendments (not including errata content) or revisions do not apply to this standard, however, encourage the parties to the agreement are based on research Whether the latest versions of these documents. For undated reference documents, the latest versions apply to this standard. GB/T 1443 from machine tools and tool handles with clip cone (GB/T 1443-1996, eqv ISO 296.1991) GB/T 2075 Classification and use of cutting large groups and groups of application of hard cutting materials classification code (GB/T 2075- 2007, ISO 513.2004, IDT) GB/T 4246 reamer special tolerances (GB/T 4246-2004, ISO 522. 1975, IDT)

3 Tolerance

3.1 cutting portion Reamer diameter tolerance referring to GB/T 4246 design, the tolerance position according to the workpiece, cutting conditions and other circumstances may be appropriate to move on. Appendix A gives the processing H7, H8, H9 tolerance precision reamer diameter hole. 3.2 shank 3.3 length Reamer length tolerance according to Table 1. Table 1 length tolerance in millimeters To more than tolerance 6 30 ± 1.0 30 120 ± 1.5 120 315 ± 2.0 315 1000 ± 3.0

4 type and size

4.1 straight shank machine reamer of the type according to FIG. 1, give priority to the size of the Table 2, the diameter of the segment's size Table 3. Also needed teeth It can be made into a spiral or helical teeth.

Tips & Frequently Asked Questions:

Question 1: How long will the true-PDF of GB/T 4251-2008_English be delivered?

Answer: Upon your order, we will start to translate GB/T 4251-2008_English as soon as possible, and keep you informed of the progress. The lead time is typically 1 ~ 3 working days. The lengthier the document the longer the lead time.

Question 2: Can I share the purchased PDF of GB/T 4251-2008_English with my colleagues?

Answer: Yes. The purchased PDF of GB/T 4251-2008_English will be deemed to be sold to your employer/organization who actually pays 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+ countries

Question 4: Do you accept my currency other than USD?

Answer: Yes. If you need your currency to be printed on the invoice, please write an email to [email protected]. In 2 working-hours, we will create a special link for you to pay in any currencies. Otherwise, follow the normal steps: Add to Cart -- Checkout -- Select your currency to pay.

Question 5: Should I purchase the latest version GB/T 4251-2008?

Answer: Yes. Unless special scenarios such as technical constraints or academic study, you should always prioritize to purchase the latest version GB/T 4251-2008 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.