1、Designation: F 837 08Standard Specification forStainless Steel Socket Head Cap Screws1This standard is issued under the fixed designation F 837; 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
2、 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 chemical and mechanicalrequiremen
3、ts for stainless steel inch socket head cap screw(SHCS) with nominal thread 0.060 through 1.500 in. andintended for use in applications requiring general corrosionresistance.1.2 Three groups of stainless steel alloys are covered,austenitic Group 1 and 2 and martensitic Group 5.1.3 Four property cond
4、itions are covered: austenitic AlloyGroups 1 and 2 in an annealed condition (AF) at 85 ksimaximum, in two cold worked conditions (CW) at 80 ksiminimum, (CW1) at 102 ksi minimum, and martensitic AlloyGroup 5 in a heat treated condition (HT) at 160 ksi minimum.1.4 The values stated in inch-pound units
5、 are to be regardedas standard. The values given in parentheses are mathematicalconversions to SI units that are provided for information onlyand are not considered standard.1.5 The following precautionary caveat pertains only to thetest method portion, Section 13, of this specification: Thisstandar
6、d does not purport to address all of the safety concerns,if any, associated with its use. It is the responsibility of the userof this standard to establish appropriate safety and healthpractices and determine the applicability of regulatory limita-tions prior to use.2. Referenced Documents2.1 ASTM S
7、tandards: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 Practice for Cleaning, Descaling, and Passivation ofStainless Steel Parts, Equipment, and SystemsA 555/A 555M Spec
8、ification for General Requirements forStainless Steel Wire and Wire RodsA 751 Test Methods, Practices, and Terminology forChemical Analysis of Steel ProductsA 967 Specification for Chemical Passivation Treatmentsfor Stainless Steel PartsD 3951 Practice for Commercial PackagingE18 Test Methods for Ro
9、ckwell Hardness of MetallicMaterialsE92 Test Method for Vickers Hardness of Metallic Mate-rialsE 384 Test Method for Microindentation Hardness of Ma-terialsF 606 Test Methods for Determining the Mechanical Prop-erties of Externally and Internally Threaded Fasteners,Washers, Direct Tension Indicators
10、, and RivetsF 788/F 788M Specification for Surface Discontinuities ofBolts, Screws, and Studs, Inch and Metric SeriesF 1470 Guide for Fastener Sampling for Specified Mechani-cal Properties and Performance Inspection2.2 ASME Standard:ASME B18.3 Socket Cap, Shoulder, and Set ScrewsInchSeries33. Classi
11、fication3.1 The austenitic stainless steel socket head cap screw shallbe designated F 837 Group 1 or 2 Condition AF, F 837 Group1 or 2 Condition CW, or F837 Group 1 or 2 Condition CW1.3.2 The martensitic stainless steel socket head cap screwshall be designated F 837 Group 5 Condition HT.4. Ordering
12、Information4.1 Orders for socket head cap screws under this specifica-tion shall include:4.1.1 Quantity (number of pieces of each item).4.1.2 Name of the item (socket head cap screws, SHCS).4.1.3 Size (nominal diameter, thread pitch, thread class,screw length) or part number.1This specification is u
13、nder the jurisdiction of ASTM Committee F16 onFasteners and is the direct responsibility of Subcommittee F16.04 on NonferrousFasteners.Current edition approved July 1, 2008. Published July 2008. Originally approvedin 1988. Last previous edition approved in 2002 as F 837 02a1.2For referenced ASTM sta
14、ndards, visit the ASTM website, www.astm.org, orcontact ASTM Customer Service at serviceastm.org. For Annual Book of ASTMStandards volume information, refer to the standards Document Summary page onthe ASTM website.3Available from Global Engineering Documents, 15 Inverness Way, EastEnglewood, CO 801
15、12-5704, http:/.1Copyright ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959, United States.4.1.4 Alloy Group (see 7.1) and Condition (Group 1 or 2AF, Group 1 or 2 CW, Group 1 or 2 CW1, or Group 5 HT).4.1.5 ASTM specification and year of issue. When year ofissu
16、e is not specified, fasteners shall be furnished to the latestissue.4.1.6 Supplementary requirements, if any, (see S1 throughS7).4.1.7 Additional special requirements, if any, to be specifiedon the purchase order:4.1.7.1 Forming (see 5.1).4.1.7.2 Threading (see 5.2).4.1.7.3 Surface finish (see 11.1)
17、.4.1.7.4 Alloy selection (see 7.2).4.1.7.5 Test report (see 12.2).4.1.7.6 Additional testing (see 12.3).4.1.7.7 Inspection (see 14.1).4.1.7.8 Rejection (see 15.1).4.1.7.9 Certification (see 16.1).4.1.7.10 Special packaging requirements (see 18.3).4.1.7.11 Supplementary requirements as needed.5. Mate
18、rials and Manufacture5.1 HeadsUnless otherwise specified the head and socketrecess of the screw may be hot forged, cold forged, ormachined at the option of the manufacturer. Users requiringcold forged heads should specify Supplementary RequirementsS1.5.2 ThreadsUnless otherwise specified, screws in
19、sizes upto 1.00 in. inclusive and product lengths up to 6 in. inclusive,shall have threads formed by rolling, except by special agree-ment with the purchaser. Larger products may be rolled, cut, orground at the option of the manufacturer.6. Heat Treatment6.1 Austenitic alloys Group 1 or 2 Condition
20、AF screws,following manufacture, shall be annealed by heating to 1900 650F to obtain maximum corrosion resistance and minimumpermeability. The screws shall be held for a sufficient time attemperature and then cooled at a rate sufficient to preventprecipitation of the carbide and to provide the prope
21、rtiesspecified in Table 1.6.2 When Condition CW or CW1 is specified, the austeniticalloys shall be annealed as specified in 6.1 generally by the rawmaterial manufacturer, then cold worked to develop specificproperties.6.3 Martensitic alloy Group 5 Condition HT screws shall behardened and tempered by
22、 heating to 1800 6 50F sufficientfor austenitization, holding for at least12 h, rapid air or oilquenching, reheating to 525F minimum and holding for atleast 1 h and then air cooling to provide the properties specifiedin Table 1.7. Chemical Properties7.1 It is the intent of this specification that sc
23、rews shall beordered by alloy group and condition. The chemical composi-tion of the screw material shall conform to the requirements ofTable 2.7.2 Unless otherwise specified in the inquiry and purchaseorder (see Supplementary Requirements S2) the choice of analloy from within a group shall be at the
24、 discretion of thefastener manufacturer as required by their method of fastenerfabrication and material availability. The specific alloy used bythe manufacturer shall be clearly identified on all certificationrequired in the purchase order and shall have chemical com-position conforming to the limit
25、s specified in Table 2.7.3 When chemical analysis 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 contents shall conform to thetolerances specified in Specifica
26、tion A 555/A 555M.7.3.1 In the event of discrepancy, a referee analysis asspecified in 13.1 of samples for each lot shall be made inaccordance with 12.3.1.8. Mechanical Properties8.1 Screws shall be tested in accordance with the mechani-cal testing requirements for the alloy group and conditionnomin
27、al thread diameter, length, and specified minimum ten-sile strength as specified in Table 3 and shall meet themechanical requirements specified for that product in Table 1.TABLE 1 Mechanical Property RequirementsAlloyGroupConditionAlloyMechanicalPropertyMarkingNominalThreadDiameterAFull-Size Product
28、 Machine Specimen Core HardnessBTensileStrength, ksiMinimumExtensionCTensileStrength, ksiYield Strength,ksiMinimumElongation,%Vickers Rockwell1 AF F837A 0.0601.500 85 max 0.6D 85 max 55 max 40 210 max 95 HRB max1 CW F837B 0.0600.750 80 min 0.4D 80 min 40 min 25 150 min 50 HRA min1 CW1 F837C 0.0600.7
29、50 102 min 0.4D 87 min 65 min 20 220 min 59 HRA min2 AF F837D 0.0601.500 85 max 0.6D 85 max 55 max 40 210 max 95 HRB max2 CW F837E 0.0600.750 80 min 0.4D 80 min 40 min 25 150 min 50 HRA min2 CW1 F837F 0.0600.750 102 min 0.4D 87 min 65 min 20 220 min 59 HRA min5 HT F837G 0.0600.190 180 min . . . . .
30、. . . . . . . 350423 3643 HRC5 HT F837H 0.2501.500 180 min 0.2D 160 min 120 min 12 350423 3643 HRCAFor CW and CW1 condition fasteners with nominal thread diameter larger than 0.750 in., the mechanical properties and marking shall be agreed upon between theuser and manufacturer.BCore hardness is only
31、 required when full-size product tensile testing cannot be accomplished.CD denotes nominal thread size.F8370828.2 For products on which both hardness and tension testsare performed, acceptance based on tensile requirements shalltake precedence over low hardness readings (see Table 4).9. Corrosion Re
32、sistance9.1 Carbide Precipitation:9.1.1 Rod, bar, and wire in the austenitic alloy groups 1 and2 (not including the free-machining grade 303) used to makefasteners in accordance with this specification shall be capableof passing the test for susceptibility to intergranular corrosionas specified in P
33、ractice E of Practice A 262.9.1.2 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.10. Dimensions10.1 Unl
34、ess otherwise specified, the products shall conformto the requirements of ASME B18.3.11. Workmanship, Finish, and Appearance11.1 Surface TreatmentUnless otherwise specified,screws shall be cleaned, descaled and passivated in accordancewith Practice A 380 or Specification A 967 at the option of thema
35、nufacturer.11.2 The surface discontinuities for these products shallconform to Specification F 788/F 788M and the additionallimitations specified herein.11.2.1 Forging defects that connect the socket to the periph-ery of the head are not permissible. Defects originating on theperiphery and with a tr
36、averse indicating a potential to intersectare not permissible. Other forging defects are permissibleprovided those located in the bearing area, fillet, and topsurfaces shall not have a depth exceeding 0.03 D or 0.005 in,whichever is greater. For peripheral discontinuities, the maxi-mum depth may be
37、0.06 D (see Fig. 1).11.2.2 Forging defects located in the socket wall within 0.1times the actual key engagement, T, from the bottom of thesocket are not permissible. Discontinuities located elsewhere inthe socket shall not have a length exceeding 0.25 T,oramaximum depth of 0.03 D not to exceed 0.005
38、 in. (see Fig. 2).11.2.3 Seams in the shank shall not exceed a depth of 0.03D or 0.008 in., whichever is greater.11.2.4 No transverse discontinuities shall be permitted inthe head-to-shank fillet area.11.2.5 Threads shall have no laps at the root or on the flankslocated below the pitch line. Laps ar
39、e permitted at the crests(Fig. 3) that do not exceed 25 % of the basic thread depth, andon the flanks outside the pitch cylinder. Longitudinal seamsrolled beneath the root of the thread and across the crests of cutthreads are acceptable within the limits of 11.2.3.12. Number of Tests12.1 The require
40、ments 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 ofTABLE 2 Chemical RequirementsAlloyGroupUNSDesignationAlloyComposition, % maximum exc
41、ept as shownCarbon Manganese Phosphorus Sulfur Silicon Chromium Nickel Copper MolybdenumAustenitic Alloys1 S30300 303A0.15 2.00 0.20 0.15 min 1.00 17.0 to 19.0 8.0 to 10.0 . . . 0.60 maxB1 S30400 304 0.08 2.00 0.045 0.030 1.00 18.0 to 20.0 8.0 to 10.5 1.00 . . .1 S30403 304L 0.030 2.00 0.045 0.030 1
42、.00 18.0 to 20.0 8.0 to 12.0 1.00 . . .1 S30500 305 0.12 2.00 0.045 0.030 1.00 17.0 to 19.0 10.5 to 13.0 1.00 . . .1 S38400 384 0.08 2.00 0.045 0.030 1.00 15.0 to 17.0 17.0 to 19.0 . . . . . .1 S20300 XM1A0.08 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 maxB1 S30430
43、18-9LW 0.10 2.00 0.045 0.030 1.00 17.0 to 19.0 8.0 to 10.0 3.00 to 4.00 . . .1 S30433 302HQ 0.03 2.00 0.045 0.030 4.00 17.0 to 19.0 8.0 to 10.0 3.0 to 4.0 . . .2 S31600 316 0.08 2.00 0.045 0.030 1.00 16.0 to 18.0 10.0 to 14.0 . . . 2.0 to 3.02 S31603 316L 0.03 2.00 0.045 0.030 1.00 16.0 to 18.0 10.0
44、 to 14.0 . . . 2.0 to 3.0Martensitic Alloys5 UNS41000 410 0.15 1.00 0.040 0.030 1.00 11.5 to 13.5 . . .AFree machining grades are not recommended for forged product. These grades may be furnished only when approved by the purchaser.BAt manufacturers option, determined only when intentionally added.T
45、ABLE 3 Mechanical Testing RequirementsItem Product LengthHardnessTest Conducted Using Full SizeProductTest Conducted Using Machined Test Specificationmax min Extension Axial TensileStrengthYield Strength0.2 % offsetTensileStrengthElongation1 #3 DAB B. . . . .2D-12 in.B.BB. . .3 Over 12 in.B. AABBBAD
46、 denotes nominal diameter of product.BDenotes mandatory test. In addition, either all tests denoted by A or all tests denoted by B shall be performed. In case of arbitration full size tests, denoted A, shallbe decisive.F837083individual shipments of fasteners are not ordinarily necessary.A record of
47、 the individual heat of steel in each lot shall bemaintained. The containers shall be coded to permit identifi-cation of the lot.12.2 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 siz
48、e in eachshipment.12.3 When tests of individual shipments are required,Supplementary Requirement S1 must be specified in theinquiry and order.12.3.1 When the purchaser does not specify the samplingplan and basis of acceptance, the following shall apply:12.3.1.1 The lot, for purposes of selecting sam
49、ples, shallconsist of all products offered for inspection and testing, at onetime, that are the same type, style, nominal diameter, threadpitch, nominal length, material (alloy), condition, and surfacefinish.12.3.1.2 From each lot, samples shall be selected at randomand tested for each requirement in accordance with thefollowing plan:Number of Pieces in Lot Number ofSamples800 and less 1Over 800 to 8000, 2inclOver 8000 to 322 000, inclOver 22 000 512.3.1.3 Should any sample fail to meet the requirements ofa specified test, double the number o
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