ASTM F788-2013(2018) Standard Specification for Surface Discontinuities of Bolts Screws and Studs Inch and Metric Series.pdf
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1、Designation: F788 13 (Reapproved 2018)Standard Specification forSurface Discontinuities of Bolts, Screws, and Studs, Inchand Metric Series1This standard is issued under the fixed designation F788; the number immediately following the designation indicates the year of originaladoption or, in the case
2、 of revision, the year of last revision.Anumber in parentheses indicates the year of last reapproval.Asuperscriptepsilon () indicates an editorial change since the last revision or reapproval.This standard has been approved for use by agencies of the U.S. Department of Defense.1. Scope*1.1 This spec
3、ification establishes allowable limits for thevarious types of surface discontinuities that may occur duringthe manufacture and processing of bolts, screws, and studs,including heat-treated machine screws, tapping screws, andsems (the washers of screw-washer assemblies are excluded).This specificati
4、on covers metric series products with nominaldiameters of 4 mm and larger and with specified minimumtensile strengths of 420 MPa and higher; and inch seriesproducts with nominal diameters of No. 5 (0.1250 in.) andlarger and with specified minimum tensile strengths of 60 000psi and higher.1.2 When th
5、e engineering requirements of the applicationnecessitate control of surface discontinuities on bolts, screws,or studs, the purchaser shall specify conformance to ASTMSpecification F788, in the original inquiry and purchase order.1.2.1 When the engineering requirements of the applicationnecessitate t
6、hat surface discontinuities on bolts, screws, andstuds be controlled within limits closer than those specified inthis specification, the purchaser shall specify the applicablelimits in the original inquiry and purchase order.1.3 The allowable limits established in this specification formetric bolts,
7、 screws, and studs with nominal diameters from 4to 24 mm inclusive, are essentially identical with requirementsgiven in ISO 6157I. There are no ISO standards for surfacediscontinuities on any inch-series products.1.4 The values stated in either SI units or inch-pound unitsare to be regarded separate
8、ly as standard. The values stated ineach system may not be exact equivalents; therefore, eachsystem shall be used independently of the other. Combiningvalues from the two systems may result in non-conformancewith the standard.1.5 This international standard was developed in accor-dance with internat
9、ionally recognized principles on standard-ization established in the Decision on Principles for theDevelopment of International Standards, Guides and Recom-mendations issued by the World Trade Organization TechnicalBarriers to Trade (TBT) Committee.2. Referenced Documents2.1 ASTM Standards:2E340 Pra
10、ctice for Macroetching Metals and AlloysF1470 Practice for Fastener Sampling for Specified Me-chanical Properties and Performance InspectionF1789 Terminology for F16 Mechanical Fasteners2.2 ISO Standard:3ISO 6157I Fasteners, Surface Discontinuities on Bolts,Screws and Studs3. Ordering Information3.1
11、 Orders for bolts, screws, and studs requiring disconti-nuity control shall include the following:3.1.1 ASTM designation and date of issue of this specifica-tion.3.1.2 Special requirements, for example, closer discontinu-ity limits (1.2.1) and inspection sampling plan (6.2).4. Types of Surface Disco
12、ntinuities (see TerminologyF1789 for definitions not provided)4.1 Crack4.1.1 Quench CracksTypical quench cracks are shown inFig. 1. Limits are specified in 5.2.4.1.2 Forging CracksTypical forging cracks are shown inFig. 2. Limits are specified in 5.3.4.2 BurstTypical bursts are shown in Fig. 3. Limi
13、ts arespecified in 5.4.1This specification is under the jurisdiction of ASTM Committee F16 onFasteners and is the direct responsibility of Subcommittee F16.93 on QualityAssurance Provisions for Fasteners.Current edition approved Sept. 1, 2018. Published September 2018. Originallyapproved in 1982. La
14、st previous edition approved in 2013 as F788 13. DOI:10.1520/F0788-13R18.2For referenced ASTM standards, visit the ASTM website, www.astm.org, orcontact ASTM Customer Service at serviceastm.org. For Annual Book of ASTMStandards volume information, refer to the standards Document Summary page onthe A
15、STM website.3Available from International Organization for Standardization (ISO), ISOCentral Secretariat, BIBC II, Chemin de Blandonnet 8, CP 401, 1214 Vernier,Geneva, Switzerland, http:/www.iso.org.*A Summary of Changes section appears at the end of this standardCopyright ASTM International, 100 Ba
16、rr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959. United StatesThis international standard was developed in accordance with internationally recognized principles on standardization established in the Decision on Principles for theDevelopment of International Standards, Guides and Recom
17、mendations issued by the World Trade Organization Technical Barriers to Trade (TBT) Committee.14.2.1 Shear BurstA shear burst is an open break in themetal located at approximately a 45 angle to the product axis.Shear bursts occur most frequently at the periphery of productshaving flanged or circular
18、 heads. Shear bursts may also occuron the sides of hex-head products. Typical shear bursts areshown in Fig. 3. Limits are specified in 5.4.4.3 SeamTypical seams are shown in Fig. 4. Limits arespecified in 5.5.4.4 FoldTypical folds are shown in Fig. 5 a, b, and c.Limits are specified in 5.6.4.5 Threa
19、d LapLimits are specified in SupplementaryRequirement S.1.1.4.6 VoidA void is a shallow pocket or hollow on thesurface of a bolt or screw due to nonfilling of metal duringforging. Voids are produced by marks or impressions of chips(shear burrs) or by rust formation on the raw material. They arenot p
20、lanished during forging. Typical voids are shown in Fig.6. Limits are specified in 5.7.4.7 Tool MarksTool marks are longitudinal or circumfer-ential grooves of shallow depth produced by the movement ofmanufacturing tools over the surface of the bolt or screw.Typical tool marks are shown in Fig. 7. L
21、imits are specified in5.8.4.8 Gouge and Nickan indentation on the surface of afastener produced by impact with another fastener, or fromprocessing equipment during manufacture, handling or trans-port.5. Allowable Limits5.1 Letter DefinitionsThroughout the followingrequirements, D designates the nomi
22、nal size (basic majordiameter of thread) of bolts, screws, and studs, except forproducts with shoulders, in which case D designates the largestshoulder diameter; and Dc designates flange diameter (speci-fied maximum) or head diameter (specified maximum) ofcircular head products. For metric series pr
23、oducts, D and Dcare in millimetres; for inch-series products, D and Dc are ininches.5.2 Quench CracksQuench cracks of any depth, anylength, or in any location are not permitted.5.3 Forging CracksForging cracks on the top of the headof bolts and screws are permitted, provided that (a) no crackshall h
24、ave a length exceeding 1.0 D, and ( b) no crack shallhave a width or depth exceeding 0.04 D. See Note 1.NOTE 1Forging cracks within the limits of this specification may beunsightly, but do not affect the mechanical properties or functionalrequirements of the bolt.5.4 Bursts and Shear Bursts (see Not
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