ASTM F812/F812M-03

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.

General Information

• Status: Historical
• Publication Date: 30-Sep-2003
• ICS: 21.060.20 - Nuts
• Technical Committee: F16 - Fasteners
• Drafting Committee: F16.93 - Quality Assurance Provisions for Fasteners

Relations

• Replaces: ASTM F812/F812M-02 - Standard Specification for Surface Discontinuities of Nuts, Inch and Metric Series
• Effective Date: 01-Oct-2003
• Replaced By: ASTM F812/F812M-07 - Standard Specification for Surface Discontinuities of Nuts, Inch and Metric Series
• Effective Date: 15-Nov-2007
• Referred By: ASTM F1470-19 - Standard Practice for Fastener Sampling for Specified Mechanical Properties and Performance Inspection
• Effective Date: 01-Oct-2003

Standards Content (Sample)

NOTICE: This standard has either been superseded and replaced by a new version or withdrawn.
Contact ASTM International (www.astm.org) for the latest information
Designation: F 812/F 812M – 03
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 F 606 Test Methods for Determining the Mechanical Prop-
erties of Externally and Internally Threaded Fasteners,
1.1 This specification establishes allowable limits for the
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Washers, and Rivets
various types of surface discontinuities that may occur during
F 606M Test Methods for Determining the Mechanical
the manufacture and processing of metric-series nuts with
Properties of Externally and InternallyThreaded Fasteners,
nominal diameters 5 mm and larger and inch-series nuts with
2
Washers, and Rivets [Metric]
1
nominal diameters ⁄4 in. and larger.
F 1470 GuideforFastenerSamplingforSpecifiedMechani-
1.2 The values stated in either SI (metric) or inch-pound
2
cal Properties and Performance Inspection
units are to be regarded separately as standard. The values
2
F 1789 Terminology for F16 Mechanical Fasteners
stated in each system are not exact equivalents; therefore, each
2.2 ISO Standard:
system must be used independently of the other. Combining
ISO/DIS 6157/II Fasteners, Surface Discontinuities on
values from the two systems may result in nonconformance
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Nuts
with the specification.
1.3 When the engineering requirements of the application
3. Ordering Information
necessitate control of surface discontinuities on nuts, the
3.1 Orders for nuts requiring surface discontinuity control
purchaser shall specify conformance to this ASTM specifica-
shall include:
tion in the original inquiry and purchase order.
3.1.1 ASTM designation and date of issue of this specifica-
1.3.1 When the engineering requirements of the application
tion.
necessitate that surface discontinuities on nuts be controlled
3.1.2 Special requirements, for example, closer discontinu-
within limits closer than those specified in this specification,
ity limits (1.3.1) and inspection sampling plan (6.2).
the purchaser shall specify the applicable limits in the original
inquiry and purchase order.
4. Types of Surface Discontinuities (See Standard F 1789
1.4 The allowable limits established in this specification for
for definitions not provided)
metric nuts, with nominal diameters 5 to 24 mm inclusive, are
4.1 Crack:
essentially identical with requirements given in ISO/DIS 6157/
4.1.1 Quench Cracks—Typical quench cracks are shown in
II. There are no ISO standards for surface discontinuities on
Fig. 1; limits are specified in 5.2.
metric-seriesnutswithnominaldiameterslargerthan24mmor
4.1.2 Forging Cracks—Typical forging cracks are shown in
on any inch-series nuts.
Fig. 2; limits are specified in 5.3.
1.5 The following precautionary caveat pertains only to the
4.1.3 Inclusion Cracks—Normally caused by nonmetallic
test method portion, Section 7, of this specification: This
inclusions or stringers inherent in the raw material. Typical
standard does not purport to address all of the safety concerns,
inclusion cracks are shown in Fig. 2; limits are specified in 5.3.
if any, associated with its use. It is the responsibility of the user
4.1.4 Locking-Element Cracks—Occurduetoapplicationof
of this standard to establish appropriate safety and health
pressure when forming the locking element of prevailing
practices and determine the applicability of regulatory limita-
torque-typenuts.Suchcracksareusuallylocatedinthevicinity
tions prior to use.
of the locking element and may be either on the internal or
2. Referenced Documents external surface. Typical locking element cracks are shown in
Fig. 3; limits are specified in 5.4.
2.1 ASTM Standards:
4.1.5 Washer-Retainer Cracks—Openings in the lip or hub
of metal used to retain a washer on a nut. Washer-retainer
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This specification is under the jurisdiction of ASTM Committee F16 on
Fasteners and is the direct responsibility of Subcommittee F16.93 on Quality
2
Assurance Provisions for Fasteners. Annual Book of ASTM Standards, Vol 01.08.
3
Current edition approved Oct. 1, 2003. Published October 2003. Originally Available from American National Standards Institute (ANSI), 25 W. 43rd St.,
approved in 1983. Last previous edition approved in 2002 as F 812/F 812M – 02. 4th Floor, New York, NY 10036.
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959, United States.
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F 812/F 812M – 03
FIG. 1 Typical Quench C
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