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GB/T 5785-2025: Fasteners - Hexagon head bolts - Fine pitch thread
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Std ID	Version	USD	Buy	Deliver [PDF] in	Title (Description)
GB/T 5785-2025	English	379	Add to Cart	4 days [Need to translate]	Fasteners - Hexagon head bolts - Fine pitch thread
GB/T 5785-2016	English	130	Add to Cart	0--9 seconds. Auto-delivery	Hexagon head bolts -- Fine pitch thread
GB/T 5785-2000	English	479	Add to Cart	3 days [Need to translate]	Hexagon head bolts with fine pitch thread
GB/T 5785-1986	English	RFQ	ASK	3 days [Need to translate]	Hexagon head bolts--Fine pitch thread--Product grades A and B

GB/T 5785-2025: Fasteners - Hexagon head bolts - Fine pitch thread

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ICS 21.060.10 CCSJ13 National Standards of the People's Republic of China Replaces GB/T 5785-2016 Fasteners, hexagonal head bolts, fine thread Published on 2025-10-31 Implemented on February 1, 2026 State Administration for Market Regulation The State Administration for Standardization issued a statement.

Table of contents

Preface III 1.Scope 1 2 Normative References 1 3.Terms and Definitions 2 4.Type and Dimensions 2 5 Technical Requirements 8 6.Signs and Labels 9. 7 Mark 9 Appendix A (Normative) Dimensions of Grade B Bolts (8mm~14mm) 11 References 12

Foreword

This document complies with the provisions of GB/T 1.1-2020 "Standardization Work Guidelines Part 1.Structure and Drafting Rules of Standardization Documents". Drafting. This document replaces GB/T 5785-2016 "Hexagonal Head Bolts - Fine Thread". Compared with GB/T 5785-2016, the main differences are in structural adjustments and formatting. Aside from the logical changes, the main technical changes are as follows. a) The M18×2 specification has been added (see Table 2); b) For M14×1.5 specification, dwmin is changed to 19.64mm (see Table 1,.2016 edition); c) Minimum and maximum standard length rules were added, and the minimum and maximum standard lengths were adjusted accordingly (see Figure 1 and Table 2). Tables 1-5 and Table A.1); d) The performance grade 5.6 for steel bolts (see Table 3 in the.2016 edition) has been deleted, and performance grades 12.9/12.9 have been added (see Table 6); e) Add stainless steel bolt groups D4 and D6 and performance grade 80 (see Table 6); f) Remove non-ferrous metal bolts (see Table 3 in the.2016 edition); g) Add signs and labels (see Chapter 6). This document is modified to adopt ISO 8765.2022 "Fasteners - Fine thread hex head bolts - Product grades A and B". The technical differences between this document and ISO 8765.2022, and the reasons therefor, are as follows. ---The statement in ISO 8765 that "If other technical requirements are needed, the performance level can be selected from ISO 898-1, and from ISO 888 or..." has been removed. Dimensions are selected in ISO 4753.(Chapter 1), which is not part of the scope of this document; ---ISO 225 has been replaced with the normatively referenced GB/T 5276 to adapt to my country's technical requirements (see Chapter 4); ---ISO 4753 has been replaced with the normatively referenced GB/T 2 to adapt to my country's technical conditions (see Figure 1); ---ISO 262 has been replaced with the normatively referenced GB/T 9144 to adapt to my country's technical conditions (see Figure 1); ---ISO 888 has been replaced with the normatively referenced GB/T 3106 to adapt to my country's technical conditions (see Tables 3-5); ---ISO 8992 has been replaced with the normatively referenced GB/T 16938 to adapt to my country's technical conditions (see Table 6); ---ISO 965-1 has been replaced with the normatively referenced GB/T 197 to adapt to my country's technical conditions (see Table 6); ---ISO 898-1 has been replaced with the normatively referenced GB/T 3098.1 to adapt to my country's technical conditions (see Table 6, Chapter 6, etc.). Chapter 7); ---ISO 3506-1 has been replaced with the normatively referenced GB/T 3098.6 to adapt to my country's technical conditions (see Table 6, Chapter 6, etc.). Chapter 7); ---ISO 4759-1 has been replaced with the normatively referenced GB/T 3103.1 to adapt to my country's technical conditions (see Table 6); ---ISO 4042 has been replaced with the normatively referenced GB/T 5267.1 to adapt to my country's technical requirements (see Table 6); ---ISO 10683 has been replaced with the normatively referenced GB/T 5267.2 to adapt to my country's technical conditions (see Table 6); ---ISO 6157-1 has been replaced with the normatively referenced GB/T 5779.1 to adapt to my country's technical requirements (see Table 6); ---ISO 6157-3 has been replaced with the normatively referenced GB/T 5779.3 to adapt to my country's technical requirements (see Table 6); ---ISO 3269 has been replaced with the normatively referenced GB/T 90.1 to adapt to my country's technical conditions (see Table 6); ---ISO 1891-4 has been replaced with the normatively referenced GB/T 3099.4 to adapt to my country's technical requirements (see 6.2); ---ISO 8991 has been replaced with the normatively referenced GB/T 1237 to adapt to my country's technical conditions (see Chapter 7); ---Added normative references GB/T 3098.23 and GB/T 90.2 (see Table 6) to conform to my country's basic fastener standards; ---d >The technical requirements for M39 grade 8.8 and 10.9 bolts shall conform to GB/T 3098.23 (see Table 6) to meet the requirements of my country's large-size fasteners. Mechanical performance standards for parts; ---Packaging technical requirements have been added (see Table 6) to comply with my country's basic fastener standards; ---The markup example has been changed to a simplified markup example (see Chapter 7) to conform to GB/T 1237. The following editorial changes have also been made to this document. ---Change the standard name to "Fastener Hex Head Bolts Fine Thread"; ---Using GB/T 3098.24, GB/T 3098.25, GB/T 5267.4, GB/T 5786 and GB /Z 41117 as references Replaces ISO 3506-5, ISO 3506-6, ISO 16048, ISO 18676 and ISO /T R20491; ---The references have been changed. Please note that some content in this document may involve patents. The issuing organization of this document assumes no responsibility for identifying patents. This document was proposed by the China Machinery Industry Federation. This document is under the jurisdiction of the National Fastener Standardization Technical Committee (SAC/TC85). This document was drafted by. Yanqi Lake Basic Manufacturing Technology Research Institute (Beijing) Co., Ltd., Shandong High-Strength Fasteners Co., Ltd., and Ningbo Qun Li Fastener Manufacturing Co., Ltd., Shanghai High Strength Bolt Factory Co., Ltd., and Zhejiang Haili Co., Ltd. This document is subject to interpretation by the National Fastener Standardization Technical Committee. The release history of this document and the document it replaces is as follows. GB/T 30-1958 was first published in 1958, revised for the first time in 1966, and revised for the second time in 1976. GB/T 21-1958 was first published in 1958, revised for the first time in 1966, and revised for the second time in 1976. GB/T 22-1958 was first published in 1958, revised for the first time in 1966, and revised for the second time in 1976. ---In 1986, GB/T 5785-1986 was issued, incorporating GB/T 30-1976 "Hex Head Bolts" and GB/T 21-1976 "Small Hex Head Bolts". The content of GB/T 22-1976 "Small Hexagon Head Guide Neck Bolts" was revised for the first time in.2000 and for the second time in.2016. Revision; ---This is the third revision. Fasteners, hexagonal head bolts, fine thread

1 Scope

This document specifies the type, dimensions, technical requirements, markings, labels, and markings for Class A and B fine-thread hexagonal head bolts. This document applies to threads with a nominal diameter of 8mm to 64mm, fine-pitch threads, and performance grades of 8.8, 10.9, 12.9/12.9, and A2-50. A2-70, A4-50, A4-70, A4-80, D4-70, D4-80, D6-70, D6-80, product grades A and B, hexagonal steel and stainless steel. Head bolts (hereinafter referred to as "bolts").

2 Normative references

The contents of the following documents, through normative references within the text, constitute essential provisions of this document. Dated citations are not included. For references to documents, only the version corresponding to that date applies to this document; for undated references, the latest version (including all amendments) applies. document. GB/T 2 Ends of externally threaded fasteners (GB/T 2-2016, ISO 4753.2011, MOD) GB/T 90.1 Acceptance inspection of fasteners (GB/T 90.1-2023, ISO 3269.2019, MOD) GB/T 90.2 Fastener marking and packaging GB/T 197 Tolerances for Standard Threads (GB/T 197-2018, ISO 965-1.2013, MOD) GB/T 1237 Fastener Marking Method (GB/T 1237-2000, eqv ISO 8991.1986) GB/T 3098.1 Mechanical properties of fasteners - Bolts, screws and studs (GB/T 3098.1-2010, ISO 898-1.2009) MOD) GB/T 3098.6 Mechanical properties of fasteners - Stainless steel bolts, screws and studs (GB/T 3098.6-2023, ISO 3506-1. 2020, MOD) GB/T 3098.23 Mechanical properties of fasteners M42~M72 bolts, screws and studs GB/T 3099.4 Fastener Terminology – Control, Inspection, Delivery, Acceptance and Quality (GB/T 3099.4-2021, ISO 1891-4) 2018, MOD) GB/T 3103.1 Fastener Tolerances - Bolts, Screws and Nuts (GB/T 3103.1-2002, idtISO 4759-1.2000) GB/T 3106 Fasteners - Nominal length and thread length of bolts, screws and studs (GB/T 3106-2016, ISO 888. 2012, MOD) GB/T 5267.1 Electroplating coatings for fasteners (GB/T 5267.1-2023, ISO 4042.2022, MOD) GB/T 5267.2 Non-electrolytic zinc sheet coating for fasteners (GB/T 5267.2-2021, ISO 10683.2018, MOD) GB/T 5276 Fasteners - Bolts, screws, studs and nuts - Dimension designations and markings (GB/T 5276-2015, ISO 225. 2010, MOD) GB/T 5779.1 Surface defects in fasteners - General requirements for bolts, screws and studs (GB/T 5779.1-2000) idtISO 6157-1.1988) GB/T 5779.3 Special requirements for surface defects in fasteners, bolts and studs (GB/T 5779.3-2000) idtISO 6157-3.1988) GB/T 9144 Preferred Series of General Purpose Threads (GB/T 9144-2025, ISO 262.2023, MOD) GB/T 16938 General technical conditions for fasteners—bolts, screws, studs and nuts (GB/T 16938-2008, ISO 8992. 2005, IDT) ...