1、Designation: F 880 02Standard Specification forStainless Steel Socket-Set Screws1This standard is issued under the fixed designation F 880; the number immediately following the designation indicates the year oforiginal adoption or, in the case of revision, the year of last revision. A number in pare
2、ntheses indicates the year of last reapproval. Asuperscript 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. Scope1.1 This specification covers the requirements for austeniticgrade stai
3、nless steel socket-set screws (SSS) sizes 0.060through 0.500 in., in two conditions, AF and CW.1.2 The following hazards caveat pertains only to TestMethod Section, Section 12 of this specification. This standarddoes not purport to address (all of) the safety problemsassociated with its use. It is t
4、he responsibility of the user of thisstandard to establish appropriate safety and health practicesand determine the applicability of regulatory limitations priorto use.NOTE 1A complete metric companion to Specification F 880 has beendevelopedF 880M; therefore, no metric equivalents are shown in this
5、specification.2. Referenced Documents2.1 ASTM Standards:A 262 Practices for Detecting Susceptibility to Intergranu-lar Attack in Austenitic Stainless Steels2A 342 Test Methods for Permeability of Feebly MagneticMaterials3A 380 Practice for Cleaning, Descaling, and Passivation ofStainless Steel Parts
6、, Equipment, and Systems2A 555/A 555M Specification for General Requirements forStainless Steel Wire and Wire Rods2A 751 Test Methods, Practices, and Terminology forChemical Analysis of Steel Products2A 967 Specification for Chemical Passivation Treatmentsfor Stainless Steel Parts2D 3951 Practice fo
7、r Commercial Packaging4E 18 Test Methods for Rockwell Hardness and RockwellSuperficial Hardness of Metallic Materials5F 593 Specification for Stainless Steel Bolts, Hex CapScrews, and Studs6F 788/F 788M Specification for Surface Discontinuities ofBolts, Screws, and Studs, Inch and Metric Series6F 14
8、70 Guide for Fastener Sampling for Specific Mechani-cal Properties and Performance Inspection62.2 ASME Standard:7B 18.3 Socket Cap, Shoulder and Set Screws, Inch Series3. Classification3.1 The designation of the alloy group and condition for thetwo materials and conditions of this specification shal
9、l beconsistent with the stainless steel designations in SpecificationF 593.3.2 The austenitic stainless steel socket set screw shall bedesignated F 880 Group 1 Condition AF (solution annealed) orF 880 Group 1 Condition CW (cold worked).4. Ordering Information4.1 Orders for material under this specif
10、ication shall includethe following information:4.1.1 Quantity (number of screws);4.1.2 Dimensions, including nominal thread designation,thread pitch, nominal screw length (inches) and point configu-ration. A standard part number may be used for this definition;4.1.3 Name of the screw (SSS);4.1.4 Con
11、dition 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 issue; and4.1.7 Any special or supplemental requirements.4.2 Example50 000 pieces 0.250-20 3 0.375 cone pointSSS CW
12、 ASTM F 880 XX.5. Materials and Manufacture5.1 The screw may be forged, formed, extruded, machined,or ground to meet the dimensional characteristics and perfor-mance requirements.1This specification is under the jurisdiction of ASTM Committee F16 onFasteners and is the direct responsibility of Subco
13、mmittee F16.04 on NonferrousFasteners.Current edition approved April 10, 2002. Published May 2002. Originallypublished as F 880 - 86. Last previous edition F 880 - 01a.2Annual Book of ASTM Standards, Vol 01.03.3Annual Book of ASTM Standards, Vol 03.04.4Annual Book of ASTM Standards, Vol 15.09.5Annua
14、l Book of ASTM Standards, Vol 03.01.6Annual Book of ASTM Standards, Vol 01.08.7Available from American National Standards Institute, 11 West 42nd Street,13th Floor, New York, NY 10036.1Copyright ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959, United States.5
15、.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 cooled at a rate sufficient to prevent precipi-tation of the car
16、bide 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 properties.6. Chemical Composition6.1 The analysis of the screw
17、 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 manufacturer as determinedby his fabrication methods and material availabi
18、lity. 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 is performed by the purchaserusing finished fasteners represent
19、ing 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 A 555/A 555M.6.3.1 In the event of a discrepancy, a referee analysis of thesamples for each lot as specif
20、ied 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 without evidence of thesocket reaming or the screw bursting.7.2 Th
21、e hardness limits from 70 to 95 HRB (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 E 18.8. Corrosion Resistance Requirements8.1 Carbide Precipitation:8.1.1 Rod, bar, and wire in the austenitic alloy groups 1, 2,and
22、3, except the free-machining grades, 303 and 303Se, usedto make fasteners in accordance with this specification shall becapable of passing the test for susceptibility to intergranularcorrosion as specified in Practice E of Practices A 262.8.1.2 As stated in Practices A 262, samples may be sub-jected
23、 to the faster and more severe screening test in accor-dance with Practice A. Failing Practice A, specimens shall betested to Practice E and be considered satisfactory if passingPractice E.9. Dimensions9.1 Unless otherwise specified, the product shall conform tothe requirements of ASME B 18.3.10. Wo
24、rkmanship, Finish, and Appearance10.1 Surface TreatmentUnless otherwise specified,screws shall be cleaned, descaled, and passivated in accordancewith Practice A 380 or Specification A 967 at the option of themanufacturer.10.2 Surface Discontinuities:10.2.1 The surface discontinuities for these produ
25、cts shallconform to Specification F 788/F 788M and the additionallimitations specified herein.10.2.1.1 Processing cracks that connect the socket to theperiphery of the screw are not permissible. Defects originatingon the periphery with a traverse indicating a potential tointersect are not permissibl
26、e. 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 manufacturershall make sample inspections to ensure that the productconforms to the specified requirements. Add
27、itional 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-cation of the lot.TABLE 1 Torsional Strength RequirementsNominal Screw Size Shortest Nominal Screw
28、Lengths Subject to Torque Testing Test Torque, in.-lb, minCup and Flat Points,mmCone and Oval Points Half Dog Points, mm 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
29、.188 0.188 0.172 3 56 0.138 0.172 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 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 600F 880211.2 When spec
30、ified 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 specified in theinquiry and order.1
31、1.3.1 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, nominal diameter, thread pitch,no
32、minal 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 8000 to 22 000, incl 3Over 22 000
33、 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 rejected.11.3.1.4 If the failur
34、e 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 shall be in accordance with th
35、e 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 required, Supplementary Requirement
36、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 fromeach lot. Corrosion tests shall be performed in acc
37、ordance withPractices A 262, Practices A or E as applicable.12. Test Methods12.1 Chemical AnalysisThe chemical composition shallbe determined in accordance with Test Methods, Practices, andTerminology A 751.12.2 The fastener manufacturer may accept the chemicalanalysis of each heat of raw material p
38、urchased and reported onthe raw material certification 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 fasten
39、ers produced and delivered.12.3 Mechanical Tests:12.3.1 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 fir
40、mbase, such as a hardened screw installed from the opposite sideof the block. The applicable hexagon key bit, in accordancewith ASME B 18.3, shall be inserted to the full depth of the setscrew socket and the test torque listed in Table 2 applied bymeans of a torque wrench. The screw shall be disasse
41、mbledTABLE 2 Chemical RequirementsUNSDesignationAlloyComposition, % maximum except as shownCarbon Manganese Phosphorus Sulfur Silicon Chromium Nickel Copper MolybdenumAustenitic 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.
42、0 to 19.0 8.0 to 10.0 Se 0.15 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
43、 17.0 17.0 to 19.0 . . .S20300 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 . . .AAt the manufactu
44、rers option, determined only when intentionally added.FIG. 1 Typical Torque Test FixtureF 8803from the block and examined for compliance to the require-ments of 6.1.12.4 Corrosion ResistanceWhen specified on the pur-chase order or inquiry, corrosion tests to determine freedomfrom precipitated carbid
45、es shall be performed in accordancewith Practices A 262, Practice A or E as applicable.13. Inspection13.1 If the inspection described in 13.2 is required by thepurchaser, it shall be specified in the inquiry, order, or contract.13.2 The inspector representing the purchaser shall havefree entry to al
46、l parts of the manufacturers works that concernthe manufacture of the material ordered. The manufacturershall afford the inspector all reasonable facilities to satisfy thatthe material is being furnished in accordance with this speci-fication. All tests and inspection required by the specificationth
47、at are requested by the purchasers representative and pur-chase order shall be made prior to shipment and shall be soconducted as not to interfere unnecessarily with the operationof the work.14. Rejection and Rehearing14.1 Screws that fail to conform to the requirements of thisspecification may be r
48、ejected by the purchaser. Rejection shallbe reported to the supplier promptly and in writing. In case ofdissatisfaction with the results of tests or inspection authorizedby the purchaser, the supplier may make claim for a rehearing.15. Certification15.1 Test Report The manufacturer shall maintain on
49、 filefor a period of 5 years, the original test report, including a copyof the certified chemical analysis of the heat of material usedand the results of the required testing for the lot of fasteners.15.2 Manufacturers Certificate of ConformanceThemanufacturer shall maintain on file for a period of 5 years, acertificate indicating that the lot of fasteners was manufacturedand tested in accordance with this specification and conformsto all specified requirements.15.3 When requested by the purchaser, submission of copiesof the test report, manufacturers certificate or
