1、Designation: F 880M 02METRICStandard Specification forStainless Steel Socket Set Screws Metric1This 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 last revision. A
2、 number in parentheses 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 auste
3、niticgrade stainless steel socket set screws (SSS), sizes M1.6through M24, having Property Classes A1-50 and A1-70.NOTE 1This specification is the metric companion of SpecificationF 880.1.2 The following hazard caveat pertains only to Section 11,the Test Method Section: This standard does not purpor
4、t toaddress the safety problems associated with its use. It is theresponsibility of the user of this standard to establish appro-priate safety and health practices and determine the applica-bility of regulatory limitations prior to use.2. Referenced Documents2.1 ASTM Standards:A 262 Practices for De
5、tecting Susceptibility to Intergranu-lar Attack in Stainless Steels2A 342 Test Methods for Permeability of Feebly MagneticMaterials3A 380 Practice for Cleaning, Descaling, and Passiviation ofStainless Steel Parts, Equipment, and Systems2A 555/A555M Specification for General Requirements forStainless
6、 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 for Commercial Packaging4E 3 Practice for Preparation of Metallographic Specimens5E 18 Test
7、 Methods for Rockwell Hardness and RockwellSuperficial Hardness of Metallic Materials5E 92 Test Method for Vickers Hardness Metallic Materials5E 384 Test Method for Microindentation Hardness of Ma-terials5F 738M Specification for Stainless Steel Metric Bolts,Screws, and Studs6F 788/F788M Specificati
8、on for Surface Discontinuities ofBolts, Screws, and Studs, Inch and Metric Series6F 880 Specification for Stainless Steel Socket-Set Screws6F 1470 Guide for Fastener Sampling for Specified Mechani-cal Properties and Performance Inspection62.2 ASME Standard:B 18.3.6M Metric Series Socket Set Screws R
9、73. Classification3.1 The designation of the property class for the twomaterials and conditions of this specification shall be consistentwith the stainless steel designations in Specification F 738M.3.2 The austenitic stainless steel socket set screw shall bedesignation F 880M A150 or F 880M A170.4.
10、 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 thread designation,thread pitch, nominal screw length (millimetres) and pointconfiguration. A standard part number may be
11、 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 specified on the order or productstandard;4.1.6 ASTM designation and year of issue; and4.1.7 Any special or supplemental re
12、quirements.4.2 Example50 000 pieces M6 3 1 3 8 cone point SSSA1-70 ASTM F 880M XX.1This specification is under the jurisdiction of ASTM Committee F16 onFasteners and is the direct responsibility of Subcommittee F16.04 on NonferrousFastners.Current edition approved April 10, 2002. Published May 2002.
13、 Originallypublished as F 880M 84. Last previous edition F 880M 01a.2Annual Book of ASTM Standards, Vol 01.03.3Annual Book of ASTM Standards, Vol 03.04.4Annual Book of ASTM Standards, Vol 15.09.5Annual Book of ASTM Standards, Vol 03.01.6Annual Book of ASTM Standards, Vol 01.08.7Available from Global
14、 Engineering Documents, 15 Inverness Way East,Englewood, CO 80112.1Copyright ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959, United States.5. Materials and Manufacture5.1 The screw may be forged, formed, extruded, machined,or ground to meet the dimensional c
15、haracteristics 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,then cooled at a rate sufficient t
16、o 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 properties.6. Chemical Composit
17、ion6.1 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 manufacturer, as determinedby his fabricat
18、ion 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 is performed by the purchaseru
19、sing 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 A 555/A 555M.6.3.1 In the event of a discrepancy, a referee analysis of
20、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 without evidence of thesocket re
21、aming 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 E 18, E 92, or Test Method E 384 as appropriate.8. Corrosion Resistance Requirements8.1 Carbide Precipita
22、tion: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 in Practice E of Practices
23、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-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,
24、 the product shall conform tothe requirements of ASME B 18.3.6M.10. Workmanship, 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 Surf
25、ace Discontinuities:10.2.1 The surface discontinuities for these products 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
26、 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 manufacturerTABLE 1 Torsional Strength Re
27、quirementsNominal 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 0.0524440.06 0.12.5 4 4 4 0.18 0.334550.25 0.4245660.81.4558817286688358 8 10 10 7 1210 10 12 12
28、14 2412 12 16 16 25 4216 16 20 20 63 10520 25 25 25 126 21024 25 30 30 200 332F 880M2shall 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 st
29、eel 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 eachshipment.11.3 Whe
30、n 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, shallconsist of all
31、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 thefollowing:Number of Pi
32、eces 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 failed.All of the
33、 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 Corrosion Resistance T
34、ests: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 properly controlledp
35、ractices 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 precipitatedcarbi
36、des. Not less than one corrosion test shall be made fromeach lot. Corrosion tests shall be performed in accordance withPractices A 262, Practices A or E as applicable.12. Test Methods12.1 Chemical AnalysisThe chemical composition shallbe determined in accordance with Test Method, Practices, andTermi
37、nology A 751.12.1.1 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 testing, provided tha
38、t 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 steelblock (Fig. 1) unti
39、l the face of the screw is flush with the topsurface of the test block and the set screw bears against a firmTABLE 2 Chemical RequirementsUNSDesignationAlloyComposition, % maximum except as shownCarbon Manganese Phosphorus Sulfur Silicon Chromium Nickel Copper Molybdenum OtherAustenitic AlloysS30300
40、 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 2.00 0.045 0.030 1.00 18.0 to 20.0 8.0 to 12.0 1.00 .
41、 . . . . .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 2.25 0.50 maxA.S30430 189LW 0.03 2.00 0.045 0.030 1.
42、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.FIG. 1 Typical Torque Test FixtureF 880M3base, such as a hardened screw installed from the o
43、pposite 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 to the requirements of 7.1.12.3 Corro
44、sion 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 13.2 is required by thepurchaser, it s
45、hall 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 reasonable facilities to satisfy thatthe
46、 material 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 opera
47、tionof the 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 th
48、e purchaser, 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 fo
49、r 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 an extension ofthe 5-year document retention period shall be performed asagreed between the manufacturer and the purchaser at the timeof the inquiry or order.16. Packaging an
