GB/T 31.2-2025 Active National standards

GB/T 31.2-2025 Fasteners—Hexagon head bolts with split pin hole on shank—Part 2:Reduced shank—Product grade B

GB/T 31.2-2025 Fasteners—Hexagon head bolts with split pin hole on shank—Part 2:Reduced shank—Product grade B

Publish Date: 2025-10-31 Implement Date: 2026-02-01 For services related to genuine standard inquiry, procurement, translation, and other related services in China, please Contact Us

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Basic Information

Standard Code: GB/T 31.2-2025

Standard Type: National standards

Standard Status: Active

is_force_gb: no

CCS Name: Fasteners

ICS Name: Bolts, screws, and studs

Publish Date: 2025-10-31

Implement Date: 2026-02-01

Pages: 12 pages

Scope

This document specifies the type and dimensions, technical requirements, marking and labeling, and markings of hexagonal head bolts with holes for thin rods.
This document is applicable to bolts with thread specifications of M6 to M20, performance grades of 5.8, 6.8, 8.8, A2-50, and A2-70, with a rod diameter approximately equal to the thread pitch diameter, and a product grade of B for coarse-threaded hexagonal head bolts with holes (hereinafter referred to as "bolts").
The bolts specified in this document have a cotter pin hole machined in the rod portion of the products specified in GB/T 5784.

Development Information

Word Count: 13 Thousand words Pages: 12 pages

Same series standard

GB/T 31.3-2025 Fasteners—Hexagon head bolts with split pin hole on shank—Part 3:Fine pitch thread

Replace the following standards

GB/T 31.2-1988 Hexagon bolts with split pin hole on shank--Reduced shank--Product grade B

Referenced Standards

GB/T 90.1-2002 Fasteners—Acceptance inspection GB/T 90.1-2023 Fasteners—Acceptance inspection GB/T 90.2-2002 Fasteners—Marking and packaging GB/T 197-2003 General purpose metric screw threads—Tolerances GB/T 197-2018 General purpose metric screw threads—Tolerances GB/T 1237-2000 Designation system for fasteners GB/T 3098.1-2000 Mechanical properties of fasteners—Bolts, screws and studs GB/T 3098.1-2010 Mechanical properties of fasteners—Bolts,screws and studs GB/T 3098.6-2000 Mechanical properties of fasteners—Bolts, screws and studs made of stainless-steel GB/T 3098.6-2014 Mechanical properties of fasteners—Stainless steel Bolts,screws and studs GB/T 3098.6-2023 Mechanical properties of fasteners—Stainless steel bolts,screws and studs GB/T 3099.4-2021 Terminology of fasteners—Control,inspection,delivery,acceptance and quality GB/T 3103.1-2002 Tolerances for fasteners—Bolts, screws, studs and nuts GB/T 3106-2016 Fasteners—Bolts,screws and studs—Nominal lengths and thread lengths GB/T 5267.1-2002 Fasteners—Electroplated coatings GB/T 5267.1-2023 Fasteners—Electroplate coating GB/T 5267.2-2002 Fasteners—Non-electrolytically applied zinc flake coatings GB/T 5267.2-2017 Fasteners—Non-electrolytically applied zinc flake coatings GB/T 5267.2-2021 Fasteners—Non-electrolytically applied zinc flake coatings GB/T 5276-2015 Fasteners—Bolts,screws,studs and nuts—Symbols and descriptions of dimensions GB/T 5278 GB/T 5779.1-2000 Fasteners—Surface discontinuities—Bolts,screws and studs for general requirements GB/T 16938-1997 Fasteners—General requirements for blots,screws,studs and nuts GB/T 16938-2008 Fasteners—General requirements for bolts,screws,studs and nuts GB/T 5784-2025 Fasteners—Hexagon head bolts—Reduced shank—Product grade B

Related Standards

GB/T 3750.3-1983 Replaced

GB/T 3750.3-1983 Hollow screws

Publish Date: 1983-06-17

GB/T 5277-1985 Active

GB/T 5277-1985 Fasteners—Clearance holes for bolts and screws

Publish Date: 1985-08-01

GB/T 6560-1986 Replaced

GB/T 6560-1986 Cross recessed pan head thread forming screws

Publish Date: 1986-07-02

GB/T 6561-1986 Replaced

GB/T 6561-1986 Cross recessed countersunk head thread forming screws

Publish Date: 1986-07-02

GB/T 6562-1986 Replaced

GB/T 6562-1986 Cross recessed raised countersunk head thread forming screws

Publish Date: 1986-07-02

GB/T 6563-1986 Replaced

GB/T 6563-1986 Hexagon head thread forming screws

Publish Date: 1986-07-02