1、Designation: F880M 02 (Reapproved 2015)Standard Specification forStainless Steel Socket Set Screws (Metric)1This standard is issued under the fixed designation F880M; the number immediately following the designation indicates the year oforiginal adoption or, in the case of revision, the year of last
2、 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 U.S. Department of Defense.1. Scope1.1 This specification covers the requir
3、ements 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 c
4、ompanion of SpecificationF880.1.3 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 pr
5、actices and determine the applica-bility of regulatory limitations prior to use.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 Practic
6、e for Cleaning, 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 Passi
7、vation Treatments forStainless Steel PartsD3951 Practice for Commercial PackagingE3 Guide for Preparation of Metallographic SpecimensE18 Test Methods for Rockwell Hardness of Metallic Ma-terialsE92 Test Method for Vickers Hardness of Metallic Materials(Withdrawn 2010)3E384 Test Method for Knoop and
8、Vickers Hardness ofMaterialsF738M Specification for Stainless Steel Metric Bolts,Screws, and Studs (Withdrawn 2014)3F788/F788M Specification for Surface Discontinuities ofBolts, Screws, and Studs, Inch and Metric SeriesF880 Specification for Stainless Steel Socket, Square Head,and Slotted Headless-S
9、et ScrewsF1470 Practice for Fastener Sampling for Specified Me-chanical Properties and Performance Inspection2.2 ASME Standard:B 18.3.6M Metric Series Socket Set Screws R43. Classification3.1 The designation of the property class for the twomaterials and conditions of this specification shall be con
10、sistentwith the stainless steel designations in Specification F738M.3.2 The austenitic stainless steel socket set screw shall bedesignation F880MA150 or F880M A170.4. Ordering Information4.1 Orders for material under this specification shall includethe following information:4.1.1 Quantity (number of
11、 screws);4.1.2 Dimensions, including nominal 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 oth
12、er than passivationis required, it must be specified on the order or productstandard;1This specification is under the jurisdiction of ASTM Committee F16 onFasteners and is the direct responsibility of Subcommittee F16.04 on NonferrousFasteners.Current edition approved Sept. 1, 2015. Published Novemb
13、er 2015. Originallyapproved in 1984. Last previous edition approved in 2008 as F880M 02(2008).DOI: 10.1520/F0880M-02R15.2For 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
14、 to the standards Document Summary page onthe ASTM website.3The last approved version of this historical standard is referenced onwww.astm.org.4Available from Global Engineering Documents, 15 Inverness Way, EastEnglewood, CO 80112-5704, http:/.Copyright ASTM International, 100 Barr Harbor Drive, PO
15、Box C700, West Conshohocken, PA 19428-2959. United States14.1.6 ASTM designation and year of issue; and4.1.7 Any special or supplemental requirements.4.2 Example50 000 pieces M618cone point SSSA1-70 ASTM F880M XX.5. Materials and Manufacture5.1 The screw may be forged, formed, extruded, machined,or
16、ground to meet the dimensional characteristics and perfor-mance requirements.5.2 Heat TreatmentAustenitic alloy Class A1-50 screwsshall be annealed by heating to 1040 6 30C to obtainmaximum corrosion resistance and minimum permeability.The screws shall be held for a sufficient time at temperature,th
17、en 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 specified, the austeniticalloys shall be annealed as specified in 5.2, generally by theraw material manufacturer, then cold worked to developspecific
18、 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
19、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 analysi
20、s 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 discr
21、epancy, 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 12.2.1, shall withstand application of the testtightening torque specified in Table 2 wi
22、thout 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) minimum forcondition A1-70 shall be met as determined using Test Meth-ods E18, E92, or Test Method E384 as appropriate.8. Corrosion Resistance Requir
23、ements8.1 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 tomake fasteners in accordance with this specification shall becapable of passing the test for susceptibility to intergranularcorrosion as specified
24、in Practice E 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 Unles
25、s otherwise specified, the product shall conform tothe requirements of ASME B 18.3.6M.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 of thema
26、nufacturer.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 originati
27、ngon the periphery with a traverse indicating a potential tointersect are not permissible. For peripheral discontinuities, themaximum depth may 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 a
28、nd 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 0.33455254245660.81.55881786688358 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 332F880M 02 (2015)211. Number of Tests11.1 The requ
29、irements 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. Additional tests ofindividual shipments of fasteners are not ordinarily necessary.A record of the ind
30、ividual heat of steel in each lot shall bemaintained. The containers shall be coded to permit identifi-cation 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 eac
31、hshipment.11.3 When tests of individual shipments are required,Supplementary Requirement S1 must be specified 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, sh
32、allconsist of all products offered for inspection and testing at onetime, that are of the same style, nominal diameter, thread pitch,nominal length, 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 thefoll
33、owing: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 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
34、 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 specimen is due to improperpreparation of the specimen or an incorrect testing technique,the specimen shall be discarded and another test specimensubmitted.11.4 Corr
35、osion Resistance Tests:11.4.1 Unless otherwise specified, inspection for corrosionresistance 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 pr
36、operly controlledpractices to maintain resistance to corrosion. When corrosiontests are required, 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
37、 precipitatedcarbides. Not less than one corrosion test shall be made fromeach lot. Corrosion tests shall be performed in accordance withPractices A262, Practices A or E as applicable.12. Test Methods12.1 Chemical AnalysisThe chemical composition shallbe determined in accordance with Test Method, Pr
38、actices, andTerminology A751.12.1.1 The fastener manufacturer may accept the chemicalanalysis of each heat of raw material purchased and reported onthe raw material certification furnished by the raw materialproducer. The fastener manufacturer is not required to do anyfurther chemical analysis testi
39、ng, provided that precise heat lottraceability has been maintained throughout the manufacturingprocess on each lot of fasteners produced and 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 steelblo
40、ck (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 shall be insertedto the full depth of the set screw socket and the
41、test torquelisted in Table 1 applied by means of a torque wrench. Thescrew shall be disassembled from the block and examined forcompliance to the requirements of 7.1.12.3 Corrosion ResistanceWhen specified on the pur-chase order or inquiry, corrosion tests to determine freedomfrom precipitated carbi
42、des shall be performed in accordancewith Practices A262, 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
43、l parts of the manufacturers works that concernTABLE 2 Chemical RequirementsUNSDesignationAlloyComposition, % maximum except as shownCarbon Manganese Phosphorus Sulfur Silicon Chromium Nickel 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 0.6
44、0 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 2.00 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 1
45、0.5 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 2.25 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
46、 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.F880M 02 (2015)3the manufacture of the material ordered. The manufacturershall afford the inspector all reasonable facilities to satisfy thatthe material
47、is being furnished in accordance with this speci-fication. All tests and inspection required by the specificationthat 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
48、 work.14. Rejection and Rehearing14.1 Screws that fail to conform to the requirements of thisspecification may be rejected 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 purchase
49、r, the supplier may make claim for a rehearing.15. Certification15.1 Test ReportThe manufacturer shall maintain on 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 confo
