PDF GB/T 16823.1-1997 English
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Stress area and bearing area for theraded fasteners
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GB/T 16823.1-1997: PDF in English (GBT 16823.1-1997) GB/T 16823.1-1997
GB
NATIONAL STANDARD OF THE
PEOPLE’S REPUBLIC OF CHINA
ICS 21.060.01
J 13
GB/T 16823.1-1997
Stress area and bearing area for threaded fasteners
ISSUED ON: MAY 29, 1997
IMPLEMENTED ON: DECEMBER 01, 1997
Issued by: The State Bureau of Quality and Technical Supervision
Table of Contents
Foreword ... 3
1 Scope ... 4
2 Normative references ... 4
3 Stress area ... 5
4 Bearing area ... 6
Foreword
This Standard is equivalent to the Japanese standard JIS B 1082-1987 “Stress area and
bearing area of threaded fasteners”.
This Standard is part of the series of standards for the design of torsion-tension
relationship of threaded fasteners. The series of standards include:
GB/T 16823.1-1997 Stress area and bearing area for threaded fasteners;
GB/T 16823.2-1997 General rules for tightening threaded fasteners;
GB/T 16823.3-1997 Method of tightening test for threaded fasteners.
This Standard was proposed by Ministry of Machinery Industry of the People’s
Republic of China.
This Standard shall be under the jurisdiction of National Technical Committee on
Fasteners of Standardization Administration of China.
Drafting organizations of this Standard: Machinery Standardization Research Institute
of the Ministry of Machinery Industry is responsible for the drafting, and Standard Parts
Research Institute of Dongfeng Motor Corporation participates in the drafting.
Stress area and bearing area for threaded fasteners
1 Scope
This Standard specifies the stress area of threaded fasteners (hereinafter referred to as
stress area) and the area of the load-bearing part of the bearing surface (hereinafter
referred to as bearing area).
The stress area applies to the stress calculation of external threads and also to the
calculation of the guaranteed load of internal threads. The thread dimensions and
tolerances shall comply with GB 193, GB 196 and GB 197.
2 Normative references
The following standards contain provisions which, through reference in this Standard,
constitute provisions of this Standard. At the time of publication, the editions indicated
are valid. All standards are subject to revision. The parties who are using this Standard
shall explore the possibility of using the latest version of the following standards.
GB 8-88 Square head bolts - Product grade C
GB 67-85 Slotted pan head screws
GB 70-85 Hexagon socket cap head screws
GB 152.2-88 Fasteners - Countersinks for countersunk head screws
GB 152.3-88 Fasteners - Counterbores for hexagon socket head screws and slotted
cheese head screws
GB 152.4-88 Fasteners - Counterbores for hexagon bolts and nuts
GB 193-81 General purpose screw threads - Diameters and pitches
GB 196-81 General purpose screw threads - Basic dimensions for diameter from 1
to 600 mm
GB 197-81 General purpose screw threads - Tolerances and fits for diameter from 1
to 355mm
GB 818-85 Cross recessed pan head screws
GB 3104-82 Fasteners - Widths across flats of hexagon products
GB 5276-85 Fasteners - Bolts, screws, studs and nuts - Symbols and designations of
dimensions
GB 5277-85 Fasteners - Clearance holes for bolts and screws
GB 5787-86 Hexagon flange bolts - Product grade B
3 Stress area
3.1 Calculation of stress area, see formula (1) and (2). If there is no special requirement,
take 3 significant figures.
where: As - stress area of thread, mm2;
d - basic dimension of major diameter of external thread, mm;
d2 - basic dimension of pitch diameter of thread, mm;
d3 - basic dimension of minor diameter of thread (d1) minus 1/6 of height of the
original triangle of thread (H), i.e.: mm;
H - height of the original triangle of thread (H = 0.866025 P), mm;
P - pitch, mm;
π - Pi, π = 3.1416.
3.2 Stress area values
The stress area (As) values of coarse pitch threads M1 ~ M68 (GB 193) and fine pitch
threads M8×1 ~ M130×6 (GB 193) are shown in Table 1.
......
Source: Above contents are excerpted from the PDF -- translated/reviewed by: www.chinesestandard.net / Wayne Zheng et al.
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