ASTM F812/F812M-02
(Specification)Standard Specification for Surface Discontinuities of Nuts, Inch and Metric Series
Standard Specification for Surface Discontinuities of Nuts, Inch and Metric Series
SCOPE
1.1 This specification establishes allowable limits for the various types of surface discontinuities that may occur during the manufacture and processing of metric-series nuts with nominal diameters 5 mm and larger and inch-series nuts with nominal diameters 1/4 in. and larger.
1.2 The values stated in either SI (metric) or inch-pound units are to be regarded separately as standard. The values stated in each system are not exact equivalents; therefore, each system must be used independently of the other. Combining values from the two systems may result in nonconformance with the specification.
1.3 When the engineering requirements of the application necessitate control of surface discontinuities on nuts, the purchaser shall specify conformance to this ASTM specification in the original inquiry and purchase order.
1.3.1 When the engineering requirements of the application necessitate that surface discontinuities on nuts be controlled within limits closer than those specified in this specification, the purchaser shall specify the applicable limits in the original inquiry and purchase order.
1.4 The allowable limits established in this specification for metric nuts, with nominal diameters 5 to 24 mm inclusive, are essentially identical with requirements given in ISO/DIS 6157/II. There are no ISO standards for surface discontinuities on metric-series nuts with nominal diameters larger than 24 mm or on any inch-series nuts.
1.5 The following precautionary caveat pertains only to the test method portion, Section 6, of this specification: This standard does not purport to address all of the safety concerns, if any, associated with its use. It is the responsibility of the user of this standard to establish appropriate safety and health practices and determine the applicability of regulatory limitations prior to use.
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Designation: F 812/F 812M – 02
Standard Specification for
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Surface Discontinuities of Nuts, Inch and Metric Series
This standard is issued under the fixed designation F 812/F 812M; the number immediately following the designation indicates the year
of original adoption or, in the case of revision, the year of last revision. A number in parentheses indicates the year of last reapproval.
A superscript epsilon (e) indicates an editorial change since the last revision or reapproval.
This standard has been approved for use by agencies of the Department of Defense.
1. Scope erties of Externally and Internally Threaded Fasteners,
2
Washers, and Rivets
1.1 This specification establishes allowable limits for the
F 606M Test Methods for Determining the Mechanical
various types of surface discontinuities that may occur during
Properties of Externally and Internally Threaded Fasteners,
the manufacture and processing of metric-series nuts with
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Washers, and Rivets [Metric]
nominal diameters 5 mm and larger and inch-series nuts with
1 F 1470 Guide for Fastener Sampling for Specified Mechani-
nominal diameters ⁄4 in. and larger.
3
cal Properties and Performance Inspection
1.2 The values stated in either SI (metric) or inch-pound
3
F 1789 Terminology for F 16 Mechanical Fasteners
units are to be regarded separately as standard. The values
2.2 ISO Standard:
stated in each system are not exact equivalents; therefore, each
ISO/DIS 6157/II Fasteners, Surface Discontinuities on
system must be used independently of the other. Combining
4
Nuts
values from the two systems may result in nonconformance
with the specification.
3. Ordering Information
1.3 When the engineering requirements of the application
3.1 Orders for nuts requiring surface discontinuity control
necessitate control of surface discontinuities on nuts, the
shall include:
purchaser shall specify conformance to this ASTM specifica-
3.1.1 ASTM designation and date of issue of this specifica-
tion in the original inquiry and purchase order.
tion.
1.3.1 When the engineering requirements of the application
3.1.2 Special requirements, for example, closer discontinu-
necessitate that surface discontinuities on nuts be controlled
ity limits (1.3.1) and inspection sampling plan (6.2).
within limits closer than those specified in this specification,
the purchaser shall specify the applicable limits in the original
4. Types of Surface Discontinuities (See Standard F 1789
inquiry and purchase order.
for definitions not provided)
1.4 The allowable limits established in this specification for
4.1 Crack:
metric nuts, with nominal diameters 5 to 24 mm inclusive, are
4.1.1 Quench Cracks—Typical quench cracks are shown in
essentially identical with requirements given in ISO/DIS 6157/
Fig. 1; limits are specified in 5.2.
II. There are no ISO standards for surface discontinuities on
4.1.2 Forging Cracks—Typical forging cracks are shown in
metric-series nuts with nominal diameters larger than 24 mm or
Fig. 2; limits are specified in 5.3.
on any inch-series nuts.
4.1.3 Inclusion Cracks—Normally caused by nonmetallic
1.5 The following precautionary caveat pertains only to the
inclusions or stringers inherent in the raw material. Typical
test method portion, Section 6, of this specification: This
inclusion cracks are shown in Fig. 2; limits are specified in 5.3.
standard does not purport to address all of the safety concerns,
4.1.4 Locking-Element Cracks—Occur due to application of
if any, associated with its use. It is the responsibility of the user
pressure when forming the locking element of prevailing
of this standard to establish appropriate safety and health
torque-type nuts. Such cracks are usually located in the vicinity
practices and determine the applicability of regulatory limita-
of the locking element and may be either on the internal or
tions prior to use.
external surface. Typical locking element cracks are shown in
Fig. 3; limits are specified in 5.4.
2. Referenced Documents
4.1.5 Washer-Retainer Cracks—Openings in the lip or hub
2.1 ASTM Standards:
of metal used to retain a washer on a nut. Washer-retainer
F 606 Test Methods for Determining the Mechanical Prop-
cracks may occur when pressure is applied to the lip or hub
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This specification is under the jurisdiction of ASTM Committee F16 on
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Fasteners and is the direct responsibility of Subcommittee F16.93 on Quality Annual Book of ASTM Standards, Vol 01.08.
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Assurance Provisions for Fasteners. Annual Book of ASTM Standards, Vol 01.08.
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Current edition approved April 10, 2002. Published May 2002. Originally Available from American National Standards Institute, 11 West 42nd Street,
published as F 812/F 812M – 83. Last previous edition F 812/F 812M – 97a. 13th Floor, New York, NY 10036.
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