Standard No.:	GB/T 5781-2016
English Name:	Hexagon head bolts—Full thread—Product grade C
Chinese Name:	六角头螺栓 全螺纹 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Status:	to be superseded
Superseded by:	GB/T 5781-2025 Fasteners - Hexagon head bolts - Full thread - Product grade C
Superseded on:	2026-2-1
Abolished on:	2026-02-01
Superseding:	GB/T 5781-2000 Hexagon head bolts - Full thread - Product grade C
Target Language:	English
File Format:	PDF
Word Count:	3000 words
Translation Price(USD):	80.0
Delivery:	via email in 1 business day

1 Scope This standard specifies the types, dimensions, specifications and designation of hexagon head bolts with full thread of Grade C. This standard is applicable to hexagon head bolts with threads from M5 to M64, full thread, of performance grades 4.6 and 4.8, and of product grade C. Note: This type of product is the same as that covered by IGB/T 5780 with the exception of full thread. 2 Normative References The following referenced documents are indispensable for the application of this document. For dated reference, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies. GB/T 90.1 Fasteners - Acceptance Inspection (GB/T 90.1-2002, IS0 3269:2000, IDT) GB/T 90.2 Fasteners - Marking and Packaging GB/T 193 General Purpose Metric Screw Threads - General Plan (GB/T 193-2003, 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 5780 Hexagon Head Bolts - Product Grade C (GB/T 5780-2016, ISO 4016:2011, 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 Dimensions See Figure 1 and Tables 1 and 2 for types and dimensions of bolts. Symbols and descriptions of dimensions are specified in GB/T 5276.

Foreword i 1 Scope 2 Normative References 3 Dimensions 4 Specifications and Reference Standards 5 Designation