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ASTM F788/F788M-20e1

(Specification)

Standard Specification for Surface Discontinuities of Bolts, Screws, Studs, and Rivets, Inch and Metric Series

Standard Specification for Surface Discontinuities of Bolts, Screws, Studs, and Rivets, Inch and Metric Series

ABSTRACT
This specification establishes allowable limits for the various types of surface discontinuities that may occur during the manufacture and processing of bolts, screws, and studs, including heat-treated machine screws, tapping screws, and sems. Types of surface discontinuities are: crack; burst; seam; fold; thread lap; void; tool marks; and gouge and nick. These surface discontinuities shall be inspected in accordance with the specified requirements.
SCOPE
1.1 This specification establishes allowable limits for the various types of surface discontinuities that may occur during the manufacture and processing of bolts, screws, studs, and rivets including heat-treated machine screws, tapping screws, and sems (the washers of screw-washer assemblies are excluded). This specification covers metric series products with nominal diameters of 4 mm and larger and with specified minimum tensile strengths of 420 MPa and higher; and inch series products with nominal diameters of No. 5 (0.1250 in.) and larger and with specified minimum tensile strengths of 60 000 psi and higher.  
1.2 When the engineering requirements of the application necessitate control of surface discontinuities on bolts, screws, studs, or rivets, the purchaser shall specify conformance to ASTM Specification F788/F788M, in the original inquiry and purchase order.  
1.2.1 When the engineering requirements of the application necessitate that surface discontinuities on bolts, screws, studs, and rivets 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.  
1.3 The allowable limits established in this specification for metric bolts, screws, and studs with nominal diameters from 4 to 24 mm inclusive, are essentially identical with requirements given in ISO 6157/I. There are no ISO standards for surface discontinuities on any inch-series products, or for rivets.  
1.4 The values stated in either SI units or inch-pound units are to be regarded separately as standard. The values stated in each system may not be exact equivalents; therefore, each system shall be used independently of the other. Combining values from the two systems may result in non-conformance with the standard.  
1.5 This international standard was developed in accordance with internationally recognized principles on standardization established in the Decision on Principles for the Development of International Standards, Guides and Recommendations issued by the World Trade Organization Technical Barriers to Trade (TBT) Committee.

General Information

Status
Published
Publication Date
31-Mar-2020
ICS
21.060.10 - Bolts, screws, studs
Technical Committee
F16 - Fasteners
Drafting Committee
F16.93 - Quality Assurance Provisions for Fasteners
Current Stage
Ref Project

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ASTM F788/F788M-20e1 - Standard Specification for Surface Discontinuities of Bolts, Screws, Studs, and Rivets, Inch and Metric SeriesASTM F788/F788M-20e1 - Standard Specification for Surface Discontinuities of Bolts, Screws, Studs, and Rivets, Inch and Metric Series
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ASTM F788/F788M-20e1 - Standard Specification for Surface Discontinuities of Bolts, Screws, Studs, and Rivets, Inch and Metric Series
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This international standard was developed in accordance with internationally recognized principles on standardization established in the Decision on Principles for the
Development of International Standards, Guides and Recommendations issued by the World Trade Organization Technical Barriers to Trade (TBT) Committee.
´1
Designation: F788/F788M − 20
Standard Specification for
Surface Discontinuities of Bolts, Screws, Studs, and Rivets,
1
Inch and Metric Series
This standard is issued under the fixed designation F788/F788M; 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 (´) indicates an editorial change since the last revision or reapproval.
1
ε NOTE—Editorially updated designation in September 2023.
This standard has been approved for use by agencies of the U.S. Department of Defense.
1. Scope* 1.5 This international standard was developed in accor-
dance with internationally recognized principles on standard-
1.1 This specification establishes allowable limits for the
ization established in the Decision on Principles for the
various types of surface discontinuities that may occur during
Development of International Standards, Guides and Recom-
the manufacture and processing of bolts, screws, studs, and
mendations issued by the World Trade Organization Technical
rivets including heat-treated machine screws, tapping screws,
Barriers to Trade (TBT) Committee.
and sems (the washers of screw-washer assemblies are ex-
cluded). This specification covers metric series products with
2. Referenced Documents
nominal diameters of 4 mm and larger and with specified
2
2.1 ASTM Standards:
minimum tensile strengths of 420 MPa and higher; and inch
E340 Practice for Macroetching Metals and Alloys
series products with nominal diameters of No. 5 (0.1250 in.)
F1470 Practice for Fastener Sampling for Specified Me-
and larger and with specified minimum tensile strengths of
chanical Properties and Performance Inspection
60 000 psi and higher.
F1789 Terminology for F16 Mechanical Fasteners
1.2 When the engineering requirements of the application
3
2.2 ISO Standard:
necessitate control of surface discontinuities on bolts, screws,
ISO 6157 ⁄I Fasteners, Surface Discontinuities on Bolts,
studs, or rivets, the purchaser shall specify conformance to
Screws and Studs
ASTM Specification F788/F788M, in the original inquiry and
purchase order.
3. Ordering Information
1.2.1 When the engineering requirements of the application
3.1 Orders for bolts, screws, studs, and rivets requiring
necessitate that surface discontinuities on bolts, screws, studs,
discontinuity control shall include the following:
and rivets be controlled within limits closer than those speci-
3.1.1 ASTM designation and date of issue of this specifica-
fied in this specification, the purchaser shall specify the
tion.
applicable limits in the original inquiry and purchase order.
3.1.2 Special requirements, for example, closer discontinu-
1.3 The allowable limits established in this specification for
ity limits (1.2.1) and inspection sampling plan (6.2).
metric bolts, screws, and studs with nominal diameters from 4
to 24 mm inclusive, are essentially identical with requirements
4. Types of Surface Discontinuities (see Terminology
given in ISO 6157 ⁄I. There are no ISO standards for surface
F1789 for definitions not provided)
discontinuities on any inch-series products, or for rivets.
4.1 Crack
1.4 The values stated in either SI units or inch-pound units
4.1.1 Quench Cracks—Typical quench cracks are shown in
are to be regarded separately as standard. The values stated in
Fig. 1. Limits are specified in 5.2.
each system may not be exact equivalents; therefore, each
4.1.2 Forging Cracks—Typical forging cracks are shown in
system shall be used independently of the other. Combining
Fig. 2. Limits are specified in 5.3.
values from the two systems may result in non-conformance
with the standard.
2
For referenced ASTM standards, visit the ASTM website, www.astm.org, or
1
This specification is under the jurisdiction of ASTM Committee F16 on contact ASTM Customer Service at service@astm.org. For Annual Book of ASTM
Fasteners and is the direct responsibility of Subcommittee F16.93 on Quality Standards volume information, refer to the standard’s Document Summary page on
Assurance Provisions for Fasteners. the ASTM website.
3
Current edition approved April 1, 2020. Published May 2020. Originally Available from International Organization for Standardization (ISO), ISO
approved in 1982. Last previous edition approved in 2018 as F788 – 13(2018). DOI: Central Secretariat, BIBC II, Chemin de Blandonnet 8, CP 401, 1214 Vernier,
10.1520/F0788_F0788M-20E01. Geneva, Switzerland, http://www.iso.org.
*A Summary of Changes section appears at the end of this standard
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, Wes
...

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1.1 This specification covers the requirements for quenched and tempered alloy steel hexagon socket button (SBHCS) 0.060 through 0.625 thread sizes, flat countersunk (SFHCS) 0.060 through 1.5 thread sizes and low (SLHCS) 0.1120 through 0.625 thread sizes head cap screws having material properties for high-strength requirements.  
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1.1 This specification2 covers the chemical and mechanical requirements of two grades of carbon steel bolts and studs in sizes 1/4 in. through 4 in. The fasteners are designated by “Grade” denoting tensile strength and intended use, as follows:    
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1.5 Supplementary Requirement S1 of an optional nature is provided, which describes additional restrictions to be applied when bolts are to be welded. It shall apply only when specified in the inquiry, order, and contract.  
1.6 Terms used in this specification are defined in Terminology F1789 unless otherwise defined herein.  
1.7 This international standard was developed in accordance with internationally recognized principles on standardization established in the Decision on Principles for the Development of International Standards, Guides and Recommendations issued by the World Trade Organization Technical Barriers to Trade (TBT) Committee.

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1.7 The values stated in inch-pound units are to be regarded as standard. No other units of measurement are included in this standard.  
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SCOPE
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Type I  
Plain carbon steel, carbon boron steel, alloy steel, or alloy boron steel    
Type 2  
Withdrawn 2003    
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1.4 Terms used in this specification are defined in Terminology F1789 unless otherwise defined in this specification.  
1.5 The values stated in inch-pound units are to be regarded as standard. No other units of measurement are included in this standard.  
1.6 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, health, and environmental practices and determine the applicability of regulatory limitations prior to use.  
1.7 This international standard was developed in accordance with internationally recognized principles on standardization established in the Decision on Principles for the Development of International Standards, Guides and Recommendations issued by the World Trade Organization Technical Barriers to Trade (TBT) Committee.

  • Technical specification
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    English language
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