ASTM F788/F788M-05

Standard Specification for Surface Discontinuities of Bolts, Screws, and Studs, 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 bolts, screws, and studs, 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 800 MPa and greater; and inch series products with nominal diameters of No. 5 (0.1250 in.) and larger and with specified minimum tensile strengths of 90000 psi and greater.
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 bolts, screws, or studs, the purchaser shall specify conformance to ASTM Specification F 788/F 788M, in the original inquiry and purchase order.
1.3.1 When the engineering requirements of the application necessitate that surface discontinuities on bolts, screws, and studs 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 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.

General Information

• Status: Historical
• Publication Date: 30-Sep-2005
• ICS: 21.060.10 - Bolts, screws, studs
• Technical Committee: F16 - Fasteners
• Drafting Committee: F16.93 - Quality Assurance Provisions for Fasteners

Relations

• Replaces: ASTM F788/F788M-02 - Standard Specification for Surface Discontinuities of Bolts, Screws, and Studs, Inch and Metric Series
• Effective Date: 01-Oct-2005
• Replaced By: ASTM F788/F788M-06 - Standard Specification for Surface Discontinuities of Bolts, Screws, and Studs, Inch and Metric Series
• Effective Date: 01-Jun-2006
• Referred By: ASTM F837-20 - Standard Specification for Stainless Steel Socket Head Cap Screws
• Effective Date: 01-Oct-2005
• Referred By: ASTM F1470-19 - Standard Practice for Fastener Sampling for Specified Mechanical Properties and Performance Inspection
• Effective Date: 01-Oct-2005
• Referred By: ASTM A449-14(2020) - Standard Specification for Hex Cap Screws, Bolts and Studs, Steel, Heat Treated, 120/105/90 ksi Minimum Tensile Strength, General Use
• Effective Date: 01-Oct-2005
• Referred By: ASTM F2281-04(2017) - Standard Specification for Stainless Steel and Nickel Alloy Bolts, Hex Cap Screws, and Studs, for Heat Resistance and High Temperature Applications
• Effective Date: 01-Oct-2005
• Referred By: ASTM F3042-13(2018) - Standard Specification for Nonferrous Hex Socket, Slotted Headless, and Square Head Set Screws
• Effective Date: 01-Oct-2005
• Referred By: ASTM A394-08(2015) - Standard Specification for Steel Transmission Tower Bolts, Zinc-Coated and Bare
• Effective Date: 01-Oct-2005
• Referred By: ASTM F880-12(2017) - Standard Specification for Stainless Steel Socket, Square Head, and Slotted Headless-Set Screws
• Effective Date: 01-Oct-2005
• Referred By: ASTM A354-17e2 - Standard Specification for Quenched and Tempered Alloy Steel Bolts, Studs, and Other Externally Threaded Fasteners
• Effective Date: 01-Oct-2005
• Referred By: ASTM F3329-18 - Standard Specification for Carbon and Alloy Steel Metric Rivets
• Effective Date: 01-Oct-2005
• Referred By: ASTM F2882/F2882M-17 - Standard Specification for Screws, Alloy Steel, Heat Treated, 170 ksi and 1170 MPa Minimum Tensile Strength (Inch and Metric)
• Effective Date: 01-Oct-2005

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 788/F 788M – 05
Standard Specification for
Surface Discontinuities of Bolts, Screws, and Studs, Inch
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and Metric Series
This standard is issued under the fixed designation F 788/F 788M; 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 2. Referenced Documents
2
1.1 This specification establishes allowable limits for the 2.1 ASTM Standards:
various types of surface discontinuities that may occur during E 340 Test Method for Macroetching Metals and Alloys
the manufacture and processing of bolts, screws, and studs, F 1470 GuideforFastenerSamplingforSpecifiedMechani-
including heat-treated machine screws, tapping screws, and cal Properties and Performance Inspection
sems (the washers of screw-washer assemblies are excluded). F 1789 Terminology for F16 Mechanical Fasteners
3
This specification covers metric series products with nominal 2.2 ISO Standard:
diameters of 4 mm and larger and with specified minimum ISO 6157/I Fasteners, Surface Discontinuities on Bolts,
tensile strengths of 800 MPa and greater; and inch series Screws and Studs
products with nominal diameters of No. 5 (0.1250 in.) and
3. Ordering Information
larger and with specified minimum tensile strengths of 90 000
psi and greater. 3.1 Orders for bolts, screws, and studs requiring disconti-
nuity control shall include the following:
1.2 The values stated in either SI (metric) or inch-pound
units are to be regarded separately as standard. The values 3.1.1 ASTM designation and date of issue of this specifica-
tion.
stated in each system are not exact equivalents, therefore, each
system must be used independently of the other. Combining 3.1.2 Special requirements, for example, closer discontinu-
ity limits (1.3.1) and inspection sampling plan (6.2).
values from the two systems may result in nonconformance
with the specification.
4. Types of Surface Discontinuities (see Terminology
1.3 When the engineering requirements of the application
F 1789 for definitions not provided)
necessitate control of surface discontinuities on bolts, screws,
4.1 Crack
or studs, the purchaser shall specify conformance to ASTM
4.1.1 Quench Cracks—Typical quench cracks are shown in
Specification F 788/F 788M, in the original inquiry and pur-
Fig. 1. Limits are specified in 5.2.
chase order.
4.1.2 Forging Cracks—Typical forging cracks are shown in
1.3.1 When the engineering requirements of the application
Fig. 2. Limits are specified in 5.3.
necessitate that surface discontinuities on bolts, screws, and
4.2 Burst—Typical bursts are shown in Fig. 3. Limits are
studs be controlled within limits closer than those specified in
specified in 5.4.
this specification, the purchaser shall specify the applicable
4.2.1 Shear Burst—A shear burst is an open break in the
limits in the original inquiry and purchase order.
metal located at approximately a 45° angle to the product axis.
1.4 The allowable limits established in this specification for
Shear bursts occur most frequently at the periphery of products
metric bolts, screws, and studs with nominal diameters from 4
having flanged or circular heads. Shear bursts may also occur
to 24 mm inclusive, are essentially identical with requirements
on the sides of hex-head products. Typical shear bursts are
given in ISO 6157/I. There are no ISO standards for surface
shown in Fig. 3. Limits are specified in 5.4.
discontinuities on any inch-series products.
2
For referenced ASTM standards, visit the ASTM website, www.astm.org, or
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This specification is under the jurisdiction of ASTM Committee F16 on contact ASTM Customer Service at [e-mail]. 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 Oct. 1, 2005. Published October 2005. Originally Available fromAmerican National Standards Institute (ANSI), 25 W. 43rd St.,
approved in 1982. Last previous edition approved in 2002 as F 788/F 788M – 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 788/F 788M – 05
FIG. 1 Typical Quench Cracks
mum) or head diameter (specified maximum) of circular head
products. For metric series products, D and Dc are in millime-
tres; for inch-series products, D and Dc are in inches.
5.2 Quench Cracks—Quench c
...