1、Designation: F 880M 02 (Reapproved 2008)Standard Specification forStainless Steel Socket Set Screws (Metric)1This standard is issued under the fixed designation F 880M; the number immediately following the designation indicates the year oforiginal adoption or, in the case of revision, the year of la
2、st revision. A number in parentheses indicates the year of last reapproval. Asuperscript epsilon () 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 requireme
3、nts for austeniticgrade stainless steel socket set screws (SSS), sizes M1.6through M24, having Property Classes A1-50 and A1-70.1.2 UnitsThe values stated in SI units are to be regardedas standard. No other units of measurement are included in thisstandard.NOTE 1This specification is the metric comp
4、anion of SpecificationF 880.1.3 The following hazard caveat pertains only to Section 11,the Test Method Section: This standard does not purport toaddress the safety problems associated with its use. It is theresponsibility of the user of this standard to establish appro-priate safety and health prac
5、tices and determine the applica-bility of regulatory limitations prior to use.2. Referenced Documents2.1 ASTM Standards:2A 262 Practices for Detecting Susceptibility to Intergranu-lar Attack in Austenitic Stainless SteelsA 342/A 342M Test Methods for Permeability of FeeblyMagnetic MaterialsA 380 Pra
6、ctice for Cleaning, Descaling, and Passivation ofStainless Steel Parts, Equipment, and SystemsA 555/A 555M Specification for General Requirements forStainless Steel Wire and Wire RodsA 751 Test Methods, Practices, and Terminology forChemical Analysis of Steel ProductsA 967 Specification for Chemical
7、 Passivation Treatmentsfor Stainless Steel PartsD 3951 Practice for Commercial PackagingE 3 Guide for Preparation of Metallographic SpecimensE18 Test Methods for Rockwell Hardness of MetallicMaterialsE92 Test Method for Vickers Hardness of Metallic Mate-rialsE 384 Test Method for Microindentation Ha
8、rdness of Ma-terialsF 738M Specification for Stainless Steel Metric Bolts,Screws, and Studs (Metric)F 788/F 788M Specification for Surface Discontinuities ofBolts, Screws, and Studs, Inch and Metric SeriesF 880 Specification for Stainless Steel Socket-Set ScrewsF 1470 Guide for Fastener Sampling for
9、 Specified Mechani-cal Properties and Performance Inspection2.2 ASME Standard:B 18.3.6M Metric Series Socket Set Screws R33. Classification3.1 The designation of the property class for the twomaterials and conditions of this specification shall be consistentwith the stainless steel designations in S
10、pecification F 738M.3.2 The austenitic stainless steel socket set screw shall bedesignation F 880M A150 or F 880M A170.4. Ordering Information4.1 Orders for material under this specification shall includethe following information:4.1.1 Quantity (number of screws);4.1.2 Dimensions, including nominal
11、thread designation,thread pitch, nominal screw length (millimetres) and pointconfiguration. A standard part number may be used for thisdefinition;4.1.3 Name of the screw (SSS);4.1.4 Property Class A1-50 or A1-70;4.1.5 Coating, if required. If a finish other than passivationis required, it must be sp
12、ecified on the order or productstandard;4.1.6 ASTM designation and year of issue; and4.1.7 Any special or supplemental requirements.1This specification is under the jurisdiction of ASTM Committee F16 onFasteners and is the direct responsibility of Subcommittee F16.04 on NonferrousFasteners.Current e
13、dition approved May 1, 2008. Published August 2008. Originallyapproved in 1984. Last previous edition approved in 2002 as F 880M 02.2For referenced ASTM standards, visit the ASTM website, www.astm.org, orcontact ASTM Customer Service at serviceastm.org. For Annual Book of ASTMStandards volume inform
14、ation, refer to the standards Document Summary page onthe ASTM website.3Available from Global Engineering Documents, 15 Inverness Way, EastEnglewood, CO 80112-5704, http:/.1Copyright ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959, United States.4.2 Example50
15、 000 pieces M6 3 1 3 8 cone point SSSA1-70 ASTM F 880M 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.5.2 Heat TreatmentAustenitic alloy Class A1-50 screwsshall be annealed by heat
16、ing to 1040 6 30C to obtainmaximum corrosion resistance and minimum permeability.The screws shall be held for a sufficient time at temperature,then cooled at a rate sufficient to prevent precipitation of thecarbide and provide the properties in accordance with Table 1.5.3 When Condition A170 is spec
17、ified, the austeniticalloys shall be annealed as specified in 5.2, generally by theraw material manufacturer, then cold worked to developspecific properties.6. Chemical Composition6.1 The analysis of the screw material shall conform to thechemical composition specified in Table 2.6.2 Unless otherwis
18、e 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 availability. Thespecific alloy used by the manufacturer shall be clearlyidentified on all certifi
19、cation 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 representing each lot, the chemicalcontents obtained shall conform to the limits specified in Table
20、2 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 specified in 12.1, shall be made inaccordance with 11.3.1.7. Mechanical Properties7.1 Socket set
21、 screws, when subjected to a torque test inaccordance with 12.2.1, shall withstand application of the testtightening torque specified in Table 2 without evidence of thesocket reaming or the screw bursting.7.2 The hardness of 95 HRB (210 Vickers) maximum forcondition A1-50 and 80 HRB (150 Vickers) mi
22、nimum forcondition A1-70 shall be met as determined using Test Meth-ods E18, E92, or Test Method E 384 as appropriate.8. Corrosion Resistance Requirements8.1 Carbide Precipitation:8.1.1 Rod, bar, and wire in the austenitic alloys groups 1, 2,3, except the free-machining grades, 303 and 303Se, used t
23、omake 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 to the faster and more severe screening test in accor-dan
24、ce 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 18.3.6M.10. Workmanship, Finish, and Appearance10.1 Surface Treatment
25、Unless 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 products shallconform to Specification F 788/F 788M and the
26、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 permissible. For peripheral discontinuities, themaximum depth may
27、 be 0.06 D.TABLE 1 Torsional Strength RequirementsNominal Screw Size Shortest Nominal Screw Lengths Subject to Torque Testing for: Test Torque, N-m, minCup and Flat Points,mmCone and Oval Points,mmHalf Dog Points, mm A1-50 A1-701.6 3 3 3 0.03 0.0524440.60.12.5 4 4 4 0.18 0.33455254245660.81.55881786
28、688358 8 10 10 7 1210 10 12 12 14 2412 12 16 16 25 4216 16 20 20 63 10520 25 25 25 126 21024 25 30 30 200 332F 880M 02 (2008)211. 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
29、 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-cation of the lot.11.2 When specified i
30、n 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.11.3.1 W
31、hen 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,nominal l
32、ength, material type, and surface finish.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 Lot Number of Samples800 and less 1Over 800 to 8000, incl 2Over 8000 to 22 000, incl 3Over 22 000 511.3.1.3 Should a
33、ny 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 failure of a test specime
34、n 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 the manufacturersstan
35、dard 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 S4 must bespecifie
36、d 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 accordance withPract
37、ices A 262, Practices A or E as applicable.12. Test Methods12.1 Chemical AnalysisThe chemical composition shallbe determined in accordance with Test Method, Practices, andTerminology A 751.12.1.1 The fastener manufacturer may accept the chemicalanalysis of each heat of raw material purchased and rep
38、orted 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 fasteners produced and
39、 delivered.12.2 Mechanical Tests:12.2.1 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 firmbase, such as a
40、 hardened screw installed from the opposite sideof the block. The applicable hexagon key bit shall be insertedto the full depth of the set screw socket and the test torquelisted in Table 1 applied by means of a torque wrench. Thescrew shall be disassembled from the block and examined forcompliance t
41、o the requirements of 7.1.12.3 Corrosion ResistanceWhen specified on the pur-chase order or inquiry, corrosion tests to determine freedomfrom precipitated carbides shall be performed in accordancewith Practices A 262, Practice A or E as applicable.13. Inspection13.1 If the inspection described in 13
42、.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 all parts of the manufacturers works that concernthe manufacture of the material ordered. The manufacturershall afford the inspector all reas
43、onable facilities to satisfy thatthe material is being furnished in accordance with this speci-fication. All tests and inspection required by the specificationTABLE 2 Chemical RequirementsUNSDesignationAlloyComposition, % maximum except as shownCarbon Manganese Phosphorus Sulfur Silicon Chromium Nic
44、kel Copper Molybdenum OtherAustenitic 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 maxA.S30323 303Se 0.15 2.00 0.20 0.060 1.00 17.0 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 2.0
45、0 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 . . . . . .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.
46、25 0.50 maxA.S30430 189LW 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 . . . . . .S30433 302HQ 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 . . . . . .AAt the manufacturers option, determined only when intentionally added.F 880M 02 (2008)3that are requested by the
47、 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 rejected by the purchase
48、r. 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 ReportThe manufacturer shall maintain on filefor a period of 5 y
49、ears 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
