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GB/T 32.3-2020 (GB/T32.3-2020)

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GB/T 32.3-2020: PDF in English (GBT 32.3-2020)
GB/T 32.3-2020
GB
NATIONAL STANDARD OF THE
PEOPLE’S REPUBLIC OF CHINA
ICS 21.060.10
J 13
Replacing GB/T 32.3-1988
Hexagon bolts with wire holes on head - Fine pitch
thread
ISSUED ON: NOVEMBER 19, 2020
IMPLEMENTED ON: JUNE 01, 2021
Issued by: State Administration for Market Regulation;
Standardization Administration of the People’s Republic of
China.
Table of Contents
Foreword ... 3 
1 Scope ... 4 
2 Normative references ... 4 
3 Types and dimensions ... 5 
4 Technical conditions and reference standards ... 6 
5 Designation ... 7 
Foreword
GB/T 32, “Hexagon bolts with wire holes on head”, is divided into 3 parts:
-- GB/T 32.1, Hexagon bolts with wire holes on head;
-- GB/T 32.2, Hexagon bolts with wire holes on head - Reduced shank -
Product grade B;
-- GB/T 32.3, Hexagon bolts with wire holes on head - Fine pitch thread.
This Part is Part 3 of GB/T 32.
This Part was drafted in accordance with the rules given in GB/T 1.1-2009.
This Part replaces GB/T 32.3-1988, “Hexagon bolts with wire holes on head -
Fine pitch thread - Product grade A and B”. Compared with GB/T 32.3-1988,
the major technical changes are as follows:
-- Divide the types and dimensions into two tables according to the preferred
specifications and the non-preferred specifications (see Table 1 and Table
2; Chapter 3 of version 1988);
-- Add a table of technical conditions and reference standards (see Table 3).
This Part was proposed by China Machinery Industry Federation.
This Part shall be under the jurisdiction of National Technical Committee 85 on
Fasteners of Standardization Administration of China (SAC/TC 85).
The drafting organizations of this Part: Ningbo Jiulong Fasteners Manufacture
Co., Ltd., China Productivity Center for Machinery, Shandong Gaoqiang
Fastener Co., Ltd., Shanghai Biao Wu (PMC) High Tensile Fasteners Co., Ltd.,
Jinan Star Fastener Co., Ltd.
This Part shall be under the interpretation of the National Technical Committee
85 on Fasteners of Standardization Administration of China.
The previous versions of the standards which are replaced by this Part are:
-- GB 32-1958, GB 32-1976;
-- GB/T 32.3-1988.
Hexagon bolts with wire holes on head - Fine pitch
thread
1 Scope
This part of GB/T 32 specifies the types and dimensions, technical conditions
and reference standards, and designation of hexagon bolts with wire holes on
head of fine pitch thread.
This Part is applicable to hexagon bolts with wire holes on head, of nominal
thread diameter of d = 8 mm ~ 48 mm, fine pitch thread, property grades of 5.6,
8.8, 10.9, A2-70, A4-70, A2-50, A4-50, CU2, CU3 and AL4, products grades of
A and B.
The bolts which are specified in this Part are made with wire holes in the head
of the products that comply with GB/T 5785.
2 Normative references
The following documents are indispensable for the application of this document.
For dated references, only the dated version applies to this document. For
undated references, the latest edition (including all amendments) applies to this
document.
GB/T 90.1, Fasteners - Acceptance inspection
GB/T 90.2, Fasteners - Marking and packaging
GB/T 193, General purpose metric screw threads - General plan
GB/T 1237, Designation system for fasteners
GB/T 3098.1, Mechanical properties of fasteners - Bolts, screws and studs
GB/T 3098.6, Mechanical properties of fasteners - Stainless steel bolts,
screws and studs
GB/T 3098.10, Mechanical properties of fasteners - Bolts, screws, studs and
nuts made of non-ferrous metals
GB/T 3103.1, Tolerances for fasteners - Bolts, screws, studs and nuts
GB/T 5267.1, Fasteners - Electroplated coatings
GB/T 5267.2, Fasteners - Non-electrolytically applied zinc flake coatings
GB/T 5267.4, Passivation of corrosion-resistant stainless-steel fasteners
GB/T 5276, Fasteners - Bolts, screws, studs and nuts - Symbols and
descriptions of dimensions
GB/T 5278, Fasteners - Split pin holes and wire holes
GB/T 5779.1, Fasteners - Surface discontinuities - Bolts, screws and studs
for general requirements
GB/T 5785, Hexagon head bolts - Fine pitch thread
GB/T 9145, General purpose metric screw threads - Limits of sizes for the
screw threads of medium quality and preferable plan
GB/T 16938, Fasteners - General requirements for bolts, screws, studs and
nuts
3 Types and dimensions
The types of bolts are shown in Figure 1; the preferred specifications and
dimensions are shown in Table 1; the non-preferred specifications and
dimensions are shown in Table 2; the remaining types and dimensions are in
accordance with GB/T 5785.
Symbols and descriptions of dimensions shall comply with GB/T 5276.
Figure 1 - Hexagon bolts with wire holes on head
......
 
(Above excerpt was released on 2021-02-08, modified on 2021-06-07, translated/reviewed by: Wayne Zheng et al.)
Source: https://www.chinesestandard.net/PDF.aspx/GBT32.3-2020