High-strength fasteners are safety components widely used in automobiles, construction machinery, transportation, railways, bridge construction, aerospace, shipbuilding, electronic appliances and other industries. They are important key functional components and high-end products in fasteners.

In order to guide the healthy, orderly and sustainable development of the fastener industry, curb low-level vicious competition, ensure equipment and personal safety, protect the enthusiasm of enterprises to invest in technology research and development, improve product quality and green manufacturing application level, and meet the host industry's demand for high-quality high-strength Faster product demand, accelerate the transformation and upgrading of my country's fastener industry, and formulate the industry's standard conditions in accordance with relevant laws and regulations and industrial policies.

High-strength fasteners covered by the conditions of this specification are mechanical property classes equal to and higher than Class 8.8 (carbon and alloy steel bolts, studs and screws), Class 8 (carbon and alloy steel nuts), Class 70 ( Stainless steel bolts, studs, screws and nuts), class 21H (set screws) and carburized and quenched self-tapping screws, including high-strength connection pairs, assemblies and ancillary products supplied in sets and grades with the above product categories Equivalent to high-strength fasteners produced by foreign advanced standards.

1. Construction conditions and layout

(1) The layout of fastener enterprises and the determination of factory sites should comply with national industrial policies and relevant laws and regulations, and in line with the development plans of fastener industry and equipment manufacturing industry of each province, autonomous region, and municipality directly under the Central Government.

(2) Fastener enterprises in scenic spots, nature reserves, water sources and other areas that need special protection (Class I areas) designated by the relevant competent departments of the State Council and the people's governments of provinces, autonomous regions and municipalities directly under the Central Government shall not be recognized; Emission standards for various pollutants (air, water, noise, solid waste) of new (expanded) fastener enterprises and original fastener enterprises and disposal measures should comply with the provisions of national and local environmental protection standards.

(3) New (expanded) fastener enterprises should pass the "construction project environmental impact assessment and approval" and "occupational health and safety pre-assessment", and pass the "three simultaneous" acceptance of project environmental protection and occupational health and safety protection facilities.

2. Production technology and equipment

(1) Enterprises should reasonably select low-pollution, low-emission, low-energy-consumption and cost-effective processes according to the variety, performance grade, material, specification, batch and surface treatment requirements of the fastener products produced. No outdated processes, such as coal heating furnaces, salt bath furnaces, etc., are polluted, energy-intensive, and high-consumable equipment.

(2) Enterprises must be equipped with high-efficiency forming equipment that matches production capacity, automatic thread processing equipment, roller mesh belt furnaces and pit furnaces with gas protection, automatic control of temperature and time and other process parameters, and automatic recording of heat treatment process. and other special equipment for heat treatment, and equipped with corresponding effective ventilation and dust removal, sound insulation and noise reduction equipment and systems.

(3) Processes such as material transformation and surface treatment can be outsourced, and there should be a long-term fixed supply contract, clear quality responsibilities, and reliable quality assurance measures. Enterprises engaged in these processes should have pollutant treatment measures.

(4) Enterprises should be equipped with necessary testing equipment for chemical composition analysis, metallography, mechanical properties, torque detection, flaw detection, etc., and should be in normal working condition, and should regularly carry out metrological verification or calibration in accordance with relevant regulations.

(5) The enterprise or the industrial cluster or industrial park where it is located shall have laboratories and necessary testing equipment that match its production capacity and quality assurance, and shall have a long-term cooperation contract and provide evidence of quality inspection and control when using non-enterprise-controlled testing capabilities. .

3. Management system and product quality

(1) Fastener enterprises should establish a quality management system in accordance with GB/T19001-2008 standard (ISO/TS16949, QS9000 or VDA6.1 standard for automotive products) and pass the certification, and the system should also meet GB/T 90.3 requirements. Enterprises should have independent quality management and testing departments, with full-time quality testing personnel, and a sound quality management system.

(2) The fastener products supplied by the enterprise in batch production must conform to the current effective national standards, industry standards, international standards, advanced foreign standards or enterprise standards that have passed the record. Established product production inspection files and quality traceability system. The quality inspection standards and catalogues are shown in Annexes 1, 2 and 3.

(3) The product quality shall be issued by a third-party testing agency approved by the "Industrial Product Quality Control and Technical Evaluation Laboratory" approved by the Qualification Accreditation (Measurement Certification) and China National Accreditation Service for Conformity Assessment (CNAS), or three within two years. Usage reports provided by the above major customers. The content of the inspection report should at least include mechanical properties, material chemical composition, surface quality, etc. The customer use report should have a detailed description and evaluation of the product quality status, and attach the inspection and testing report or data issued by the above-mentioned third-party testing agency during the same period. Applicable test items and standards shall be proposed by the accepting agency, reported to the Ministry of Industry and Information Technology for approval and announced separately, and shall be changed as required.

4. Environmental protection

The environmental protection work of enterprises should combine prevention and control, actively carry out clean production, and take effective control measures for noise, dust, smoke, waste gas, waste water, waste oil and waste generated in the production process, and should meet the local emission standards. Encourage enterprises to establish environmental and occupational safety management systems in accordance with GB/T24001-2004 and GB/T28001-2011 standards. Clean production and improve the level of enterprise environmental protection management.

5. Personnel quality

(1) Personnel in special positions such as special operations, special equipment operations, physical and chemical inspections, and non-destructive testing should have qualification certificates issued by the corresponding qualification departments, and hold the certificates to work.

(2) The enterprise shall formulate the job conditions and training plans for various types of personnel, and conduct regular training in management, technology, skills, laws, regulations, etc.

6. Recognition and Supervision

(1) The competent industrial department of the State Council shall, in accordance with the conditions of this specification, organize the review of fastener enterprises that apply for access accreditation, and release the fastener enterprises that meet the conditions of the specification to the public in the form of announcements, and relevant national and local departments will Provide relevant policy support.

(2) The competent industrial departments of all provinces (autonomous regions, municipalities directly under the Central Government, and cities under separate state planning) may formulate local "fastener industry standard conditions" that are stricter than the conditions of this standard according to the actual local conditions; responsible for organizing the fastening of local application and access certification The company will conduct a preliminary review, and supervise and inspect the fastener companies that have announced access.

(3) Relevant government departments at all levels should refer to the "standard conditions for the fastener industry" to conduct project filing, land supply, credit financing and other management work for newly (expanded) fastener enterprises.

(4) The administrative measures for the announcement of access enterprises shall be formulated separately by the Ministry of Industry and Information Technology.

7. Supplementary Provisions

(1) The conditions of this specification are applicable to all high-strength fastener manufacturers (including workshops) within the territory of the People's Republic of China (excluding Taiwan, Hong Kong, and Macau).

(2) When the standards cited in this specification are revised, the latest version shall be used.

(3) The conditions of this specification will be revised and announced to the public according to the development of my country's fastener industry and changes in relevant national policies and regulations.

(4) The Ministry of Industry and Information Technology is responsible for the interpretation of the conditions of this specification.

Attachment 1: Fastener Industry Access Announcement Inspection Items

Annex II: Catalogue of performance requirements and inspection standards

Annex 3: Product Standards for High Strength Fasteners

Attachment 1: Fastener Industry Access Announcement Inspection Items

1. Inspection items

The inspection items include the main mechanical performance, working performance and size items specified in the national standard. Once the standards on which the inspection items and inspection methods are based in the access announcement are revised, inspections shall be carried out in accordance with the requirements of the new standards from the date of implementation of the standards. The specific inspection items will be announced in the following format.

Fastener Industry Access Announcement Inspection Items

The serial number is applicable to the product category. The test items are based on the standard sample size and the number of qualified judgments.

Ac ReNote

1 Tensile strength of bolts, screws and studs GB/T 3098.1

GB/T 3098.6

GB/T 3098.2230 1

Guaranteed load 30 1

Hardness 30 1

Decarburization layer test 30 1

Breaking torque GB/T 3098.1330 1 option

Thread through and stop GB/T 197201 2

2 Guaranteed load of nuts GB/T 3098.2

GB/T 3098.4

GB/T 3098.1530 1

Hardness 30 1

Effective torque performance GB/T 3098.930 1

Thread pass and stop GB/T 197201 2

3 Connecting pair of bolts/nut threads through GB/T 197201 2

Bolt wedge load GB/T 1231

GB/T 363230 1

Nut guaranteed load GB/T 1231

GB/T 363230 1

Nut hardness GB/T 1231

GB/T 363230 1

Washer hardness GB/T 1231

GB/T 363230 1

Torque coefficient GB/T 1231 8GB/T 1231 3.3.1

Fastening axial force GB/T 32698GB/T 3632 5.3

4 Vickers hardness of set screw GB/T 3098.330 1

Decarbonization GB/T 3098.330 1

Guaranteed torque GB/T 3098.330 1 is suitable for 45H

5 Core hardness of self-tapping screw GB/T 3098.730 1

Surface hardness GB/T 3098.730 1

Depth of carburized layer GB/T 3098.730 1

Breaking torque GB/T 3098.730 1

Screw in performance GB/T 3098.730 1

2. Representative products

The varieties and specifications of the tested products should be the leading products of the enterprise, and there should be no less than three batches.

3. Evaluation principles

When the sampling requirements are specified in the relevant standards, the sampling shall be carried out according to the relevant standards, and if there are no regulations, the requirements shall be in accordance with GB/T90.1.

Annex II: Catalogue of performance requirements and inspection standards

GB/T 90.1-2002 Fastener acceptance inspection

GB/T 90.2-2002 Fasteners Marking and Packaging

GB/T 90.1-2002 Fastener Quality Assurance System

GB/T 196-2003 common thread basic size

GB/T 197-2003 Ordinary thread tolerance

GB/T 1231-2006 Technical requirements for high-strength large hexagon head bolts, large hexagon nuts and washers for steel structures

GB/T 3632-2008 Torsional shear type high-strength bolt connection pair for steel structure

GB/T 3098.1-2010 Mechanical properties of fasteners Bolts, screws and studs

GB/T 3098.2-2000 Mechanical properties of fasteners Nuts Coarse thread

GB/T 3098.3-2000 Mechanical properties of fasteners Set screws

GB/T 3098.4-2000 Mechanical properties of fasteners Nuts Fine thread

GB/T 3098.5-2000 Mechanical properties of fasteners Self-tapping screws

GB/T 3098.6-2000 Mechanical properties of fasteners Stainless steel bolts, screws and studs

GB/T 3098.7-2000 Mechanical properties of fasteners Self-extrusion screws

GB/T 3098.8-2010 Mechanical properties of fasteners - Bolted connection parts used at -200℃～+700℃

GB/T 3098.9-2010 Mechanical properties of fasteners Effective torque profile steel lock nut

GB/T 3098.10-1993 Mechanical properties of fasteners Bolts, screws, studs and nuts made of non-ferrous metals

GB/T 3098.11-2002 Mechanical properties of fasteners Self-drilling self-tapping screws

GB/T 3098.13-1996 Mechanical properties of fasteners Torque test and breaking torque of bolts and screws Nominal diameter 1～10mm

GB/T 3098.14-2000 Mechanical properties of fasteners Nut reaming test

GB/T 3098.15-2000 Mechanical properties of fasteners Stainless steel nuts

GB/T 3098.22-2009 Mechanical properties of fasteners Fine-grained non-quenched and tempered steel bolts, screws and studs

GB/T 5267.1-2002 Fastener Electroplating

GB/T 5267.2-2002 Fasteners Electroless zinc flake coating

GB/T 5267.3-2008 Fasteners Hot-dip galvanized coating

GB/T 5779.1-2000 Surface defects of fasteners - Bolts, screws and studs General requirements

GB/T 5779.2-2000 Surface defects of fasteners Nuts

GB/T 5779.3-2000 Surface defects of fasteners - Bolts, screws and studs - Special requirements

GB/T 16939-1997 High-strength bolts for steel grid bolts and ball joints

GB/T 70.5-2008 Internal Hexagonal Gauge

JB/T 9151.1-1999 Fasteners Test Methods Dimensional and Geometric Accuracy Bolts, Screws, Studs and Nuts

JB/T 9151.3-1999 Fastener test method Dimension and geometric accuracy Self-tapping screw

JB/T 7384.1-1994 Fasteners Diagonal Width End Stop Inspection Die

JB/T 7384.4-1994 Fasteners - inspection die for wrenching height

JB/T 7384.6-1994 Fasteners Hexagonal Diagonal Width Through-End Gauge

JB/T 7384.11-1994 Fastener Nut thread vertical gauge

JB/T 7384.12-1994 Fastener screw straightness inspection die

JB/T 7384.13-1994 Fastener Self-tapping locking screw circumcircle diameter gauge

Annex 3: Product Standards for High Strength Fasteners

GB/T 70.1-2008 Hexagon socket head cap screws