GB/T 794-2021 English PDF (GBT794-2021)

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GB/T 794-2021: Strenthened cup head square neck bolts
GB/T 794-2021
NATIONAL STANDARD OF THE
PEOPLE’S REPUBLIC OF CHINA
ICS 21.060.10
CCS J 13
Replacing GB/T 794-1993
Strengthened cup head square neck bolts
ISSUED ON. DECEMBER 31, 2021
IMPLEMENTED ON. JULY 01, 2022
Issued by. State Administration for Market Regulation;
Standardization Administration of the People’s Republic of China.
Table of Contents
Foreword... 3 
1 Scope... 5 
2 Normative references... 5 
3 Terms and definitions... 6 
4 Type and size... 6 
5 Technical conditions and reference standards... 9 
6 Designation... 10 
References... 11 
Foreword
This document was drafted in accordance with the rules given in GB/T 1.1-2020,
Directives for standardization - Part 1.Rules for the structure and drafting of
standardizing documents.
This document is one of the series national standards of "Square Neck Bolts", of which
the following documents has been issued.
-- GB/T 10, Countersunk head square neck bolts;
-- GB/T 12, Cup head square neck bolts;
-- GB/T 14, Mushroom head square neck bolts;
-- GB/T 794, Strengthened cup head square neck bolts;
-- GB/T 801, Cup head square neck bolts with small head and short neck - Product
grade B.
This document replaces GB/T 794-1993 Strengthened cap head square neck bolts;
compared with GB/T 794-1993, in addition to editorial changes, the main technical
changes of this document are as follows.
a) Replace "commodity specification range" with "optical length range" (see Table
1, Table 2; Table 1 and Table 2 of the 1993 edition);
b) Unify the referenced thread standards as GB/T 193, GB/T 9145, GB/T 9146 (see
Table 3; Table 3 of the 1993 edition);
c) Add the general technical conditions, which shall be in accordance with GB/T
16938 (see Table 3);
d) Delete grade 3.6 from, and add grade 4.6 to, type B products (see Table 3; Table
3 of the 1993 edition);
e) Delete the oxidized surface treatment (see Table 3 of the 1993 edition);
f) Add the technical requirements for electroplating of steel bolts, which shall be in
accordance with GB/T 5267.1 (see Table 3);
g) Add the technical requirements for non-electrolytically applied zinc flake coatings,
which shall be in accordance with GB/T 5267.2 (see Table 3);
h) Add the technical requirements for hot-dip galvanizing of steel bolts, which shall
be in accordance with GB/T 5267.3 (see Table 3);
Strengthened cup head square neck bolts
1 Scope
This document specifies the type, size, technical conditions and marking of
strengthened cup head square neck bolts.
This document is applicable to strengthened cup head square neck bolts with thread
specifications of M6 ~ M20 and product grades of B (type A) and C (type B).
2 Normative references
The following documents, in whole or in part, are normatively referenced in this
document and are indispensable for its application. For dated references, only the
version corresponding to that date is applicable to this document; for undated references,
the latest version (including all amendments) is applicable to this document.
GB/T 2, Fasteners - Ends of parts with external thread
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 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 5267.3, Fasteners - Hot dip galvanized coatings
GB/T 5276, Fasteners - Bolts, screws, studs and nuts - Symbols and descriptions of
dimensions
GB/T 5779.1, Fasteners - Surface discontinuities - Bolts, screws and studs for
general requirements