GB/T 972-2008 PDF EnglishUS$130.00 · In stock · Download in 9 seconds
GB/T 972-2008: Thread rolling flat dies Delivery: 9 seconds. True-PDF full-copy in English & invoice will be downloaded + auto-delivered via email. See step-by-step procedure Status: Valid GB/T 972: Historical versions
Similar standardsGB/T 972-2008: Thread rolling flat dies---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/GBT972-2008GB NATIONAL STANDARD OF THE PEOPLE’S REPUBLIC OF CHINA ICS 25.100.50 J 41 Replacing GB/T 972-1994 Thread rolling flat dies 搓丝板 ISSUED ON: JUNE 03, 2008 IMPLEMENTED ON: JANUARY 01, 2009 Issued by: General Administration of Quality Supervision, Inspection and Quarantine; Standardization Administration of the People’s Republic of China. Table of ContentsForeword ... 3 1 Scope ... 4 2 Normative references ... 4 3 Type and size of thread rolling flat dies ... 4 4 Technical requirements ... 10 5 Marking and packaging ... 11 Thread rolling flat dies1 ScopeThis Standard stipulates the basic requirements for the type and size, profile size and deviation, technical requirements, marking and packaging of thread rolling flat dies for general purpose metric screw threads. This Standard applies to thread rolling flat dies for processing general purpose metric screw threads (GB/T 192~193, GB/T 196~197). Thread rolling flat dies are divided into three precision grades: grade 1, grade 2 and grade 3. Grade 1 applies to the processing of external threads with tolerance grades 4 and 5; grade 2 applies to the processing of external threads with tolerance grades 5 and 6; grade 3 applies to the processing of external threads with tolerance grades 6 and 7.2 Normative referencesThe terms in the following documents become the terms of this Standard by reference to this Standard. For dated references, all subsequent amendments (not including errata content) or revisions do not apply to this standard. However, parties to agreements that are based on this Standard are encouraged to study whether the latest versions of these documents can be used. For undated references, the latest edition applies to this Standard. GB/T 192, General purpose metric screw threads - Basic profile (GB/T 192-2003, ISO 68-1:1998, MOD) GB/T 193, General purpose metric screw threads - General plan (GB/T 193-2003, ISO 261:1998, MOD) GB/T 196, General purpose metric screw threads - Basic dimensions (GB/T 196- 2003, ISO 724:1993, MOD) GB/T 197, General purpose metric screw threads - Tolerances (GB/T 197-2003, ISO 965-1:1998, MOD)3 Type and size of thread rolling flat dies3.1 The type and size of thread rolling flat dies shall be as specified in Figure 1, as well as in Table 1, Table 2 and Table 3. The installation angle of the thread rolling flat dies for processing screw threads of d≤6 mm can also be made into 90°. The thread rolling flat die of coarse pitch thread -- nominal diameter of processed thread 8 mm, pitch 1.25 mm, width 50 mm, fixed thread rolling flat die length 110 mm, precision grade 2, thread profile A: Thread rolling flat die AM8×50/110-2 GB/T 972- 2008 The thread rolling flat die of fine pitch thread -- nominal diameter of processed thread 8 mm, pitch 1.00 mm, width 50 mm, fixed thread rolling flat die length 110 mm, precision grade 2, thread profile A: Thread rolling flat die AM8×1×50/110-2 GB/T 972- 2008 Thread rolling flat dies for left screw threads shall be marked with “LH” after the precision.4 Technical requirements4.1 The surface of the thread rolling flat die must be free of cracks, nicks, rust, grinding burns and other defects that affect the performance. 4.2 The thread rolling flat die is made of 9SiCr or Cr12MoV alloy tool steel. The uniformity of carbides of Cr12MoV is not more than grade 3. 4.3 The deviation of dimensions LD, LG, and B shall be h14. The width difference between the fixed thread rolling flat die and the movable thread rolling flat die in a pair of thread rolling flat dies shall not be greater than 0.1 mm. 4.4 The surface roughness of the thread rolling flat dies is not greater than: -- Thread profile surface: Rz 6.3 μm; -- Supporting surface, device surface: Ra 0.8 μm. 4.5 The hardness of the working part of the thread rolling flat dies is 59HRC~62HRC; there shall be no decarburization and lower hardness on the working surface. 4.6 For the parallelism tolerance OF the intersection line between the plane perpendicular to the supporting surface of the thread rolling flat die and the crest plane TO the supporting surface, the width direction shall be in accordance with Table 5, and the length direction shall be in accordance with Table 6. When inspecting the parallelism of the crest of the thread rolling flat die to the supporting surface, the first complete profile on both sides of the width direction can be ignored. When inspecting the parallelism between the crest of the movable thread rolling flat die and the supporting surface, the range of the two ends of the length direction of the thread rolling flat die equal to the length (L) of the fixed thread rolling flat die’s pressed part can be ignored. ......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 972-2008 be delivered?Answer: The full copy PDF of English version of GB/T 972-2008 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 972-2008_English with my colleagues?Answer: Yes. The purchased PDF of GB/T 972-2008_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 972-2008 -- 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 972-2008?Answer: Yes. Unless special scenarios such as technical constraints or academic study, you should always prioritize to purchase the latest version GB/T 972-2008 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.How to buy and download a true PDF of English version of GB/T 972-2008?A step-by-step guide to download PDF of GB/T 972-2008_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 972-2008". 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 |
