1、Designation: F880 12 (Reapproved 2017)Standard Specification forStainless Steel Socket, Square Head, and Slotted Headless-Set Screws1This standard is issued under the fixed designation F880; the number immediately following the designation indicates the year of originaladoption or, in the case of re
2、vision, 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 specificat
3、ion covers the requirements for austeniticgrade stainless steel socket-set screws (SSS) sizes 0.060through 1.000 in. square head set screws (SHSS) sizes 0.190through 1.500 in., and slotted headless set screws (HSS) 0.060through 0.750 in., in two conditions, AF and CW.1.2 UnitsThe values stated in in
4、ch-pound units are to beregarded as standard. No other units of measurement areincluded in this standard.NOTE 1A complete metric companion to Specification F880 has beendevelopedF880M; therefore, no metric equivalents are shown in thisspecification.1.3 The following hazards caveat pertains only to T
5、estMethod Section, Section 12 of this specification. This standarddoes not purport to address all of the safety concerns, if any,associated with its use. It is the responsibility of the user of thisstandard to establish appropriate safety, health, and environ-mental practices and determine the appli
6、cability of regulatorylimitations prior to use.1.4 This international standard was developed in accor-dance with internationally recognized principles on standard-ization established in the Decision on Principles for theDevelopment of International Standards, Guides and Recom-mendations issued by th
7、e World Trade Organization TechnicalBarriers to Trade (TBT) Committee.2. Referenced Documents2.1 ASTM Standards:2A262 Practices for Detecting Susceptibility to IntergranularAttack in Austenitic Stainless SteelsA342/A342M Test Methods for Permeability of WeaklyMagnetic MaterialsA380 Practice for Clea
8、ning, Descaling, and Passivation ofStainless Steel Parts, Equipment, and SystemsA555/A555M Specification for General Requirements forStainless Steel Wire and Wire RodsA751 Test Methods, Practices, and Terminology for Chemi-cal Analysis of Steel ProductsA967 Specification for Chemical Passivation Tre
9、atments forStainless Steel PartsD3951 Practice for Commercial PackagingE18 Test Methods for Rockwell Hardness of Metallic Ma-terialsF593 Specification for Stainless Steel Bolts, Hex CapScrews, and StudsF788/F788M Specification for Surface Discontinuities ofBolts, Screws, and Studs, Inch and Metric S
10、eriesF1470 Practice for Fastener Sampling for Specified Me-chanical Properties and Performance Inspection2.2 ASME Standard:3B 18.3 Socket Cap, Shoulder and Set Screws, Inch SeriesB 18.6.2 Slotted Head Cap Screws, Square Head Set Screws,and Slotted Headless Set Screws (Inch Series)3. Classification3.
11、1 The designation of the alloy group and condition for thetwo materials and conditions of this specification shall beconsistent with the stainless steel designations in SpecificationF593.3.2 The austenitic stainless steel socket set screw shall bedesignated F880 Group 1 Condition AF (solution anneal
12、ed) orF880 Group 1 Condition CW (cold worked).4. Ordering Information4.1 Orders for material under this specification shall includethe following information:4.1.1 Quantity (number of screws);1This specification is under the jurisdiction of ASTM Committee F16 onFasteners and is the direct responsibil
13、ity of Subcommittee F16.04 on NonferrousFasteners.Current edition approved Dec. 1, 2017. Published December 2017. Originallyapproved in 1986. Last previous edition approved in 2012 as F880 -12. DOI:10.1520/F0880-12R17.2For referenced ASTM standards, visit the ASTM website, www.astm.org, orcontact AS
14、TM Customer Service at serviceastm.org. For Annual Book of ASTMStandards volume information, refer to the standards Document Summary page onthe ASTM website.3Available from American National Standards Institute (ANSI), 25 W. 43rd St.,4th Floor, New York, NY 10036, http:/www.ansi.org.*A Summary of Ch
15、anges section appears at the end of this standardCopyright ASTM International, 100 Barr 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 D
16、ecision on Principles for theDevelopment of International Standards, Guides and Recommendations issued by the World Trade Organization Technical Barriers to Trade (TBT) Committee.14.1.2 Dimensions, including nominal thread designation,thread pitch, nominal screw length (inches) and point configu-rat
17、ion. A standard part number may be used for this definition;4.1.3 Name of the screw (SSS, SHSS or HSS);4.1.4 Condition AF/CW;4.1.5 Surface finish, if required. If a finish other thanpassivation is required, it must be specified on the order orproduct standard;4.1.6 ASTM specification and year of iss
18、ue; and4.1.7 Any special or supplemental requirements.4.1.8 If torque testing is required for socket set screws sizesover12 inch.4.2 Example50 000 pieces 0.250-20 0.375 cone pointSSS CW ASTM F880 XX.5. Materials and Manufacture5.1 The screw may be forged, formed, extruded, machined,or ground to meet
19、 the dimensional characteristics and perfor-mance requirements.5.2 Heat TreatmentAustenitic alloys Group 1 ConditionAF screw shall be annealed by heating to 1900 6 50F toobtain maximum corrosion resistance and minimum perme-ability. The screws shall be held for a sufficient time attemperature, then
20、cooled at a rate sufficient to prevent precipi-tation of the carbide and provide the properties in accordancewith Table 1.5.3 When condition CW is specified, the austenitic alloysshall be annealed as specified in 5.2, generally by the rawmaterial manufacturer, and then cold worked to developspecific
21、 properties.6. Chemical Composition6.1 The analysis of the screw material shall conform to thechemical composition specified in Table 2.6.2 Unless otherwise specified in the inquiry and purchaseorder (see Supplementary Requirement S2), the choice of alloyused shall be that of the fastener manufactur
22、er as determinedby his fabrication methods and material availability. Thespecific alloy used by the manufacturer shall be clearlyidentified on all certification required in the purchase order andshall have a chemical composition conforming to the limitsspecified in Table 2.6.3 When chemical analysis
23、 is performed by the purchaserusing finished fasteners representing each lot, the chemicalcontents obtained shall conform to the limits specified in Table2 for the specific alloy. Chemical composition shall conform tothe tolerances specified in Specification A555/A555M.6.3.1 In the event of a discre
24、pancy, a referee analysis of thesamples for each lot as specified in 12.1 shall be made inaccordance with 11.3.1.7. Mechanical Properties7.1 Socket-set screws, when subjected to a torque test inaccordance with 12.3.1, shall withstand application of the testtightening torque specified in Table 1 with
25、out evidence of thesocket reaming or the screw bursting. Socket set screws insizes in nominal diameters over12 in. are not subject to torquestesting unless required by purchaser. The test torque valuesmust be supplied by purchaser and agreed to by the supplier.7.2 The hardness limits from 70 to 95 H
26、RB (125 to 210DPH) for Condition AF and 96 HRB to 33 HRC (216 to 327DPH) for Condition CW shall be met as determined using TestMethods E18.8. Corrosion Resistance Requirements8.1 Carbide Precipitation:8.1.1 Rod, bar, and wire in the austenitic alloy groups 1, 2,and 3, except the free-machining grade
27、s, 303 and 303Se, usedto make fasteners in accordance with this specification shall beTABLE 1 Socket Set Screw Torsional Strength RequirementsANominal Screw Size Shortest Nominal Screw Lengths Subject to Torque Testing Test Torque, in.-lb, minCup and Flat Points,in.Cone and Oval Points Half Dog Poin
28、ts, in. AF CW0 0.060 0.109 0.125 0.109 0.3 0.61 0.073 0.125 0.141 0.125 0.7 1.22 0.086 0.125 0.141 0.141 0.7 1.23 0.099 0.141 0.156 0.156 1.6 3.34 0.112 0.141 0.172 0.156 1.6 3.35 0.125 0.172 0.188 0.172 3 56 0.138 0.188 0.203 0.188 3 58 0.164 0.188 0.219 0.203 9 1610 0.190 0.188 0.250 0.234 16 2614
29、 0.250 0.250 0.312 0.297 40 67516 0.312 0.312 0.391 0.359 79 13538 0.375 0.375 0.438 0.438 138 237716 0.437 0.438 0.547 0.484 220 37812 0.500 0.500 0.609 0.547 358 60058 0.625 0.625 0.875 0.875 . .34 0.750 0.750 1.000 1.000 . .78 0.875 0.875 1.000 1.000 . .1 1.000 1.100 1.250 1.250 . .AFor socket se
30、t screw sizes over12 inch, torsional strength testing is not required unless specified by purchaser. The test torque values must be supplied by purchaserand agreed upon by the supplier.F880 12 (2017)2capable of passing the test for susceptibility to intergranularcorrosion as specified in Practice E
31、of Practices A262.8.1.2 As stated in Practices A262, samples may be subjectedto the faster and more severe screening test in accordance withPractice A. Failing Practice A, specimens shall be tested toPractice E and be considered satisfactory if passing Practice E.9. Dimensions9.1 Unless otherwise sp
32、ecified, the product shall conform tothe requirements of ASME B 18.3 or B 18.6.2 as applicable.10. Workmanship, Finish, and Appearance10.1 Surface TreatmentUnless otherwise specified, screwsshall be cleaned, descaled, and passivated in accordance withPractice A380 or Specification A967 at the option
33、 of themanufacturer.10.2 Surface Discontinuities:10.2.1 The surface discontinuities for these products shallconform to Specification F788/F788M and the additionallimitations specified herein.10.2.1.1 Processing cracks that connect the socket to theperiphery of the screw are not permissible. Defects
34、originatingon the periphery with a traverse indicating a potential tointersect are not permissible. For peripheral discontinuities, themaximum depth may be 0.06 D.11. Number of Tests11.1 The requirements of this specification shall be met incontinuous mass production for stock and the manufacturersh
35、all make sample inspections to ensure that the productconforms to the specified requirements. Additional tests ofindividual shipments of fasteners are not ordinarily necessary.A record of the individual heat of steel in each lot shall bemaintained. The containers shall be coded to permit identifi-ca
36、tion of the lot.11.2 When specified in the purchase order, the manufacturershall furnish a test report of the last complete set of chemicalanalysis and mechanical tests for each stock size in eachshipment.11.3 When tests of individual shipments are required,Supplementary Requirement S1 must be speci
37、fied in theinquiry and order.11.3.1 When the purchaser does not specify the samplingplan and basis of acceptance, the following shall apply.11.3.1.1 The lot, for purposes of selecting samples, shallconsist of all products offered for inspection and testing at onetime, that are of the same style, nom
38、inal diameter, thread pitch,nominal length, material type, and condition, and surfacefinish.11.3.1.2 From each lot, samples shall be selected at randomand tested for each requirement in accordance with thefollowing:Number of Pieces in LotNumber ofSamples800 and less 1Over 800 to 8000, incl 2Over 800
39、0 to 22 000, incl 3Over 22 000 511.3.1.3 Should any sample fail to meet the requirements ofa specified test, double the number of samples from the samelot shall be retested for the requirement(s) in which it failed.All of the additional samples shall conform to the specificationor the lot shall be r
40、ejected.11.3.1.4 If the failure of a test specimen is due to improperpreparation of the specimen or an incorrect testing technique,the specimen shall be discarded and another test specimensubmitted.11.4 Corrosion Resistance Tests:11.4.1 Unless otherwise specified, inspection for corrosionresistance
41、shall be in accordance with the manufacturersstandard quality control practices. No specific method ofinspection is required but the screws shall be produced fromsuitable raw material and manufactured by properly controlledpractices to maintain resistance to corrosion. When corrosiontests are requir
42、ed, Supplementary Requirement S4 must bespecified in the inquiry and order except as noted in 11.4.2.11.4.2 Products that have been hot worked shall be solutionannealed and tested to determine freedom from precipitatedcarbides. Not less than one corrosion test shall be made fromTABLE 2 Chemical Requ
43、irementsUNSDesignationAlloyComposition, % maximum except as shownCarbon Manganese Phosphorus Sulfur Silicon Chromium Nickel CopperMolybdenumAustenitic AlloysS30300 303 0.15 2.00 0.20 0.15 min 1.00 17.0 to 19.0 8.0 to 10.0 0.60 maxAS30323 303Se 0.15 2.00 0.20 0.060 1.00 17.0 to 19.0 8.0 to 10.0 Se 0.
44、15 minS30400 304 0.08 2.00 0.045 0.030 1.00 18.0 to 20.0 8.0 to 10.5 1.00 . . .S30403 304L 0.030 2.00 0.045 0.030 1.00 18.0 to 20.0 8.0 to 12.0 1.00 . . .S30500 305 0.12 2.00 0.045 0.030 1.00 17.0 to 19.0 10.5 to 13.0 1.00 . . .S38400 384 0.08 2.00 0.045 0.030 1.00 15.0 to 17.0 17.0 to 19.0 . . .S20
45、300 XM1 0.08 5.0 to 6.5 0.040 0.18 to 0.35 1.00 16.0 to 18.0 5.0 to 6.5 1.75 to 2.25 0.50 maxAS30430 189LW 0.10 2.00 0.045 0.030 1.00 17.0 to 19.0 8.0 to 10.0 3.0 to 4.0 . . .S30433 302HQ 0.03 2.00 0.045 0.030 1.00 17.0 to 19.0 8.0 to 10.0 3.0 to 4.0 . . .S31600 316 0.03 2.00 0.045 0.030 1.00 16.0 t
46、o 18.0 10.0 to 14.01 . 2.0 to 3.0S31603 316L 0.03 2.00 0.045 0.03 1.00 16.0 to 18.0 10.0 to 14.01 . 2.0 to 3.0AAt the manufacturers option, determined only when intentionally added.F880 12 (2017)3each lot. Corrosion tests shall be performed in accordance withPractices A262, Practices A or E as appli
47、cable.12. Test Methods12.1 Chemical AnalysisThe chemical composition shallbe determined in accordance with Test Methods, Practices, andTerminology A751.12.2 The fastener manufacturer may accept the chemicalanalysis of each heat of raw material purchased and reported onthe raw material certification
48、furnished by the raw materialproducer. The fastener manufacturer is not required to do anyfurther chemical analysis testing, provided that precise heat lottraceability has been maintained throughout the manufacturingprocess on each lot of fasteners produced and delivered.12.3 Mechanical Tests:12.3.1
49、 For socket strength torque test, the test screw shall beassembled into a tapped hole of 5H tolerance class in a steelblock (Fig. 1) until the face of the screw is flush with the topsurface of the test block and the set screw bears against a firmbase, such as a hardened screw installed from the opposite sideof the block. The applicable hexagon key bit, in accordancewithASME B 18.3, shall be inserted to the full depth of the setscrew socket and the test torque listed in Table 1 applied bymeans of a torque wrench. The screw shall be disassembledfrom the bloc
