GB/T 97.1-2002 English PDF (GBT97.1-2002)

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GB/T 97.1-2002: Plain washers -- Product grade A
GB/T 97.1-2002
GB
NATIONAL STANDARD OF THE
PEOPLE’S REPUBLIC OF CHINA
eqv ISO 7089.2000
Replacing GB/T 97.1-1985
Plain washers - Product grade A
平垫圈 A 级
ISSUED ON. DECEMBER 05, 2002
IMPLEMENTED ON. JUNE 01, 2003
Issued by. General Administration of Quality Supervision, Inspection and
Quarantine of the PRC
Table of Contents
Foreword ... 3 
ISO foreword ... 5 
1 Scope ... 6 
2 Reference standards ... 6 
3 Dimensions ... 7 
4 Specifications and standards of reference ... 8 
5 Designation ... 9 
Foreword
This Standard equivalently adopts the international standard ISO 7089.2000
“Plain washers - Normal series - Product grade A”.
This Standard is part of the series of national standards for “Plain washers”
product. The series includes.
a) GB/T 95-2002 Plain washers - Product grade C;
b) GB/T 96.1-2002 Large series - Product grade A;
c) GB/T 96.2-2002 Large series - Product grade C;
d) GB/T 97.1-2002 Plain washers - Product grade A;
e) GB/T 97.2-2002 Plain Washers - Chamfered-Product Grade A;
f) GB/T 97.3-2000 Plain washers for clevis pins;
g) GB/T 97.4-2002 Plain washers for screw and washer assemblies;
h) GB/T 97.5-2002 Plain washers for tapping sew and washer assemblies;
i) GB/T 848-2002 Plain washers - Small series - Product grade A;
j) GB/T 5287-2002 Plain washers - Extra large series - Product grade C.
ISO 7089 does not specify packaging technical requirements, which are
specified in this Standard (Table 3).
ISO 7089 does not specify a simplified designation. This Standard, according
to the principle of simplification of GB/T 1237, gives simplified designation
examples (5.2).
This Standard is a revised edition of GB/T 97.1-1985. The main changes are as
follows.
a) ADD the scope of application for washers of classes 200 HV and 300 HV
(Clause 1);
b) According to the preferred degree of thread size (thread diameter),
dimensions are classified into. Table 1 -- Preferred dimensions; Table 2 --
Non-preferred dimensions (Table 1 and Table 2);
c) ADD nominal sizes. 18, 22, 27, 33, 39, 42, 45, 48, 52, 56, 60, and 64 mm
(Table 1 and Table 2);
Plain washers - Product grade A
1 Scope
This Standard specifies normal-series, product-grade-A plain washers in the
200 HV and 300 HV hardness classes and of nominal sizes (nominal thread
diameters) ranging from 1.6 mm to 64 mm inclusive.
Washers of hardness class 200 HV are suitable for
- hexagon bolts and screws of product grades A and B in property classes
up to and including 8.8;
- hexagon nuts of product grades A and B in property classes up to and
including 8;
- hexagon bolts, screws and nuts of stainless steel and of similar chemical
composition;
- case-hardened thread rolling screws.
Washers of hardness class 300 HV are suitable for
- hexagon bolts and screws of product grades A and B in property classes
up to and including 10.9;
- hexagon nuts of product grades A and B in property classes up to and
including 10.
If dimensions other than those listed in this Standard are required, they should
be selected from those given in GB/T 5286.
When soft material pieces are clamped, or large clearance holes in the
workpiece are used, the user should check the suitability of this type of washer.
2 Reference standards
The following standards contain provisions which, through reference in this
Standard, constitute provisions of this Standard. At the time of publication of
this Standard, the editions shown are valid. All standards will be revised. Parties
who use this Standard shall investigate the possibility of applying the most
recent editions of the standards indicated below.