1、Designation: F880M 16Standard 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 revision. A numbe
2、r 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. Scope*1.1 This specification covers the requirements for austen
3、iticgrade 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 companion of Speci
4、ficationF880.1.3 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 practices and deter
5、mine 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/A380M Practice for Clean
6、ing, Descaling, and Passi-vation of Stainless 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/A967M Specification for Chemical Passivat
7、ion Treat-ments for Stainless Steel PartsD3951 Practice for Commercial PackagingE3 Guide for Preparation of Metallographic SpecimensE18 Test Methods for Rockwell Hardness of Metallic Ma-terialsE92 Test Methods for Vickers Hardness and Knoop Hard-ness of Metallic MaterialsE384 Test Method for Microin
8、dentation Hardness of Mate-rialsF738M Specification for Stainless Steel Metric Bolts,Screws, and Studs (Withdrawn 2014)3F788 Specification for Surface Discontinuities of Bolts,Screws, and Studs, Inch and Metric SeriesF880 Specification for Stainless Steel Socket, Square Head,and Slotted Headless-Set
9、 ScrewsF1470 Practice for Fastener Sampling for Specified Me-chanical Properties and Performance Inspection2.2 ISO Standards:4ISO 4026 Hexagon socket set screws with flat pointISO 4027 Hexagon socket set screws with cone pointISO 4028 Hexagon socket set screws with dog pointISO 4029 Hexagon socket s
10、et screws with cup point3. 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 F738M.3.2 The austenitic stainless steel socket set screw shall bedesignation F880MA1
11、50 or F880M 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 thread designation,thread pitch, nominal screw length (millimetres) and pointconfiguration. A standard
12、 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;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 May 1,
13、 2016. Published July 2016. Originally approvedin 1984. Last previous edition approved in 2015 as F880M 02(2015). DOI:10.1520/F0880M-16.2For referenced ASTM standards, visit the ASTM website, www.astm.org, orcontact ASTM Customer Service at serviceastm.org. For Annual Book of ASTMStandards volume in
14、formation, refer to the standards Document Summary page onthe ASTM website.3The last approved version of this historical standard is referenced onwww.astm.org.4Available from International Organization for Standardization (ISO), ISOCentral Secretariat, BIBC II, Chemin de Blandonnet 8, CP 401, 1214 V
15、ernier,Geneva, Switzerland, http:/www.iso.org.*A Summary of Changes section appears at the end of this standardCopyright ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959. United States14.1.5 Coating, if required. If a finish other than passivationis required,
16、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 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 groun
17、d 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,then co
18、oled 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 prop
19、erties.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 manufacturer, a
20、s 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 is
21、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 discrepanc
22、y, 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 without
23、 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 Requirement
24、s8.1 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 in Pr
25、actice 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 Unless oth
26、erwise specified, the product shall conform tothe requirements of ISO 4026, ISO 4027, ISO 4028 and ISO4029.10. Workmanship, Finish, and Appearance10.1 Surface TreatmentUnless otherwise specified, screwsshall be cleaned, descaled, and passivated in accordance withPractice A380/A380M or Specification
27、A967/A967M at theoption of the manufacturer.10.2 Surface Discontinuities:10.2.1 The surface discontinuities for these products shallconform to Specification F788 and the additional limitationsspecified herein.TABLE 1 Torsional Strength RequirementsNominal Screw Size Shortest Nominal Screw Lengths Su
28、bject 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 0.33455254245660.81.55881786688358 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
29、200 332F880M 16210.2.1.1 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 be 0.06 D.11. Number o
30、f 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. Additional tests ofindividual shipments of fasteners are not ordinarily necessary
31、.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 in the purchase order, the manufacturershall furnish a test report of the last complete set of chemicalanalysis and mechanical tests for ea
32、ch 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 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 s
33、electing samples, shallconsist 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 acc
34、ordance 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 any sample fail to meet the requirements ofa specified test, double the number of samples from the samelot shall be retested for the requir
35、ement(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 specimen is due to improperpreparation of the specimen or an incorrect testing technique,the specimen shall be discarded and another test specime
36、nsubmitted.11.4 Corrosion 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 an
37、d manufactured by properly 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 de
38、termine freedom from 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
39、with Test Method, Practices, 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 che
40、mical analysis testing, 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
41、 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 shall be insertedto the full depth of the set s
42、crew 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.TABLE 2 Chemical RequirementsUNSDesignationAlloyComposition, % maximum except as shownCarbon Manganese Phosphorus
43、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 0.60 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 . . .
44、 . . .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 . . . . . .S20300 XM1 0.08 5.0 to 6.5 0.040 0.18 to 0.35 1.00 16.0 to
45、 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 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 16312.3 C
46、orrosion ResistanceWhen specified on the pur-chase order or inquiry, corrosion tests to determine freedomfrom precipitated carbides 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, i
47、t 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 reasonable facilities to satisfy that
48、the 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 op
49、erationof 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 the 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
