Standard No.:	GB/T 5780-2016
English Name:	Hexagon Head Bolts – Product Grade C
Chinese Name:	六角头螺栓 C级
Chinese Classification:	J13    Fastener
Professional Classification:	GB    National Standard
ICS Classification:	21.060.10 21.060.10    Bolts, screws, studs 21.060.10
Source Content Issued by:	AQSIQ; MOH
Issued on:	2016-02-24
Implemented on:	2016-6-1
Status:	to be superseded
Superseded by:	GB/T 5780-2025 Fasteners - Hexagon head bolts - Product grade C
Superseded on:	2026-2-1
Abolished on:	2026-02-01
Superseding:	GB/T 5780-2000 Hexagon Head Bolts-Product Grade C
Target Language:	English
File Format:	PDF
Word Count:	4000 words
Translation Price(USD):	80.0
Delivery:	via email in 1 business day

1 Scope This standard specifies the type dimensions, technical conditions and designation of Grade C hexagon head bolt. This standard specifies the characteristics of hexagon head bolts with threads from M5 up to and including M64, of product Grade C, property grade of Grades 4.6 and 4.8 and production grade C. 2 Normative References The following documents for the application of this document are essential. For dated reference, only the edition cited applies. For undated references, the latest edition (including any amendments) applies. GB/T 90.1 Fasteners – Acceptance inspection (GB/T 90.1-2002, ISO 3269: 2000, IDT) GB/T 90.2 Fasteners – Marking and Packaging GB/T 193 Purpose Metric Screw Threads – General Plan (GB/T l93-2003, ISO 261:1998, MOD) GB/T 1237 Designation System for Fasteners (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 3103.1 Tolerances for Fasteners-Bolts, Screws and Nuts (GB/T 3103.1-2002, idt ISO 4759-1:2000) GB/T 5267.1 Fasteners – Electroplated Coatings (GB/T 5267.1-2002, ISO 4042:1999, IDT) GB/T 5267.2 Fasteners – Non-electrolytically Applied Zinc Flake Coatings (GB/T 5267.2-2002, ISO 10683:2000, IDT) GB/T 5276 Fasteners – Bolts, Screws, Studs and Nuts – Symbols and Designations of Dimensions (GB/T 5276-2015, ISO 225:2010, MOD) GB/T 5781 Hexagon Head Bolt – Full Thread – Product Grade C (GB/T 5781-2016, ISO 4018:2011, MOD) GB/T 9145 General Purpose Metric Screw Threads – Limits of Sizes for the Screw Threads of Medium Quality and Preferable Plan (GB/T 9145-2003, ISO 965-2:1998, MOD) GB/T 16938 Fasteners – General Requirements for Blots, Screws, Studs and Nuts (GB/T 16938-2008, ISO 8992:2005, IDT) 3 Dimension

Foreword I 1 Scope 2 Normative References 3 Dimension 4 Specifications and Normative References 5 Designation