1、Designation: F 837 02ae1Standard 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
2、 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.e1NOTEFootnotes A and C in Table 1 were editorially corrected in Decemb
3、er 2004.1. Scope1.1 This specification covers the chemical and mechanicalrequirements 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 Two groups of stainless steel alloys ar
4、e covered, auste-nitic Group 1 and martensitic Group 5.1.3 Four property conditions are covered: austenitic AlloyGroup 1 in an annealed condition (AF) at 85 ksi maximum, intwo cold worked conditions (CW) at 80 ksi minimum, (CW1)at 102 ksi minimum, and martensitic Alloy Group 5 in a heattreated condi
5、tion (HT) at 160 ksi minimum.1.4 The following precautionary caveat pertains only to thetest method portion, Section 13, of this specification: Thisstandard 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
6、 establish appropriate safety and healthpractices and determine the applicability of regulatory limita-tions prior to use.2. Referenced Documents2.1 ASTM Standards:2A 262 Practices for Detecting Susceptibility to Intergranu-lar Attack in Austenitic Stainless SteelsA 342 Test Methods for Permeability
7、 of Feebly MagneticMaterialsA 380 Practice 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 Pro
8、ductsA 967 Specification for Chemical Passivation Treatmentsfor Stainless Steel PartsD 3951 Practice for Commercial PackagingE18 Test Methods for Rockwell Hardness and RockwellSuperficial Hardness of Metallic MaterialsE92 Test Method for Vickers Hardness of Metallic Mate-rialsE 384 Test Method for M
9、icrohardness of MaterialsF 593 Specification for Stainless Steel Bolts, Hex CapScrews, and StudsF 606 Test Methods for Determining the Mechanical Prop-erties of Externally and Internally Threaded Fasteners,Washers, and RivetsF 788/F 788M Specification for Surface Discontinuities onBolts, Screws, and
10、 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. Classification3.1 The designation of the alloy group and condition for thetwo materials and c
11、onditions of this specification shall beconsistent with the stainless steel designations in SpecificationF 593.3.2 The austenitic stainless steel socket head cap screw shallbe designated F 837 Group 1 Condition AF, F 837 Group 1Condition CW, or F837 Group 1 Condition CW1.3.3 The martensitic stainles
12、s steel socket head cap screwshall be designated F 837 Group 5 Condition HT.4. Ordering 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).1This specification is
13、 under the jurisdiction of ASTM Committee F16 onFasteners and is the direct responsibility of Subcommittee F16.04 on NonferrousFasteners.Current edition approved July 10, 2002. Published September 2002. Originallypublished as F 837 88. Last previous edition F 837 02.2For referenced ASTM standards, v
14、isit 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 80112-57041C
15、opyright ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959, United States.4.1.3 Size (nominal diameter, thread pitch, thread class,screw length) or part number.4.1.4 Alloy Group and Condition (Group 1 AF, Group 1CW, Group 1 CW1, or Group 5 HT).4.1.5 ASTM specif
16、ication and year of issue. When year ofissue 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
17、(see 5.2).4.1.7.3 Surface finish (see 11.1).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 17.2).4.1.7.11 S
18、upplementary requirements as needed.5. Materials 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 Th
19、readsUnless otherwise specified, screws in 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.
20、1 Austenitic alloys Group 1 Condition AF screws, follow-ing manufacture, shall be annealed by heating to 1900 6 50Fto obtain maximum corrosion resistance and minimum perme-ability. The screws shall be held for a sufficient time attemperature and then cooled at a rate sufficient to preventprecipitati
21、on of the carbide and to provide the propertiesspecified 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
22、HT screws shall behardened and tempered by 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 i
23、s the intent of this specification that screws 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) whenAlloy Group
24、1 is specified, the choice of alloy used by the manufacturershall be clearly identified on all certification required in thepurchase order and shall have chemical composition conform-ing to the limits specified in Table 2.7.3 When chemical analysis is performed by the purchaserusing finished fastene
25、rs 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 Specification A 555/A 555M.7.3.1 In the event of discrepancy, a referee analysis asspecified in 13.1 of sample
26、s 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 conditionnominal thread diameter, length, and specified minimum ten-sile strength as specified in Table 3 and shall
27、 meet themechanical requirements specified for that product in Table 1.8.2 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 Resistance9.1 Carbide Precipitation:TABLE
28、 1 Mechanical Property RequirementsAlloyGroupConditionNominalThreadDiameterAFull-Size Product Machine Specimen Core HardnessBTensileStrength, ksiMinimumExtensionCTensileStrength, ksiYield Strength,ksiMinimumElongation,%Vickers Rockwell1 AF 0.0601.500 85 max 0.6D 85 max 55 max 40 210 max 95 HRB max1
29、CW 0.0600.750 80 min 0.4D 80 min 40 min 25 150 min 50 HRA min1 CW1 0.0600.750 102 min 0.4D 87 min 65 min 20 220 min 59 HRA min5 HT 0.0600.190 180 min . . . . . . . . . . . . 350423 3643 HRC5 HT 0.2501.500 180 min 0.2D 160 min 120 min 12 350423 3643 HRCAFor CW and CW1 condition fasteners with nominal
30、 thread diameter larger than 0.750 in., the mechanical properties shall be agreed upon between the user andmanufacturer.BCore hardness is only required when full-size product tensile testing cannot be accomplished.CD denotes nominal thread size.F 837 02ae129.1.1 Rod, bar, and wire in the austenitic
31、alloy group 1 (notincluding the free-machining grade 303) used to make fasten-ers in accordance with this specification shall be capable ofpassing the test for susceptibility to intergranular corrosion asspecified in Practice E of Practice A 262.9.1.2 As stated in Practices A 262, samples may be sub
32、-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 Unless otherwise specified, the products shall conformto the requirements of ASME B18
33、.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 themanufacturer.11.2 The surface discontinuities for these products shallconform to Spe
34、cification 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 traverse indicating a potential to intersectare not permissible. Other forging defec
35、ts 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 0.06 D (see Fig. 1).11.2.2 Forging defects located in the socket wall within 0.1ti
36、mes 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 in. (see Fig. 2).11.2.3 Seams in the shank shall not exceed a depth of 0.03D or 0
37、.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 are permitted at the crests(Fig. 3) that do not exceed 25 % of the basic thread dept
38、h, 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 requirements of this specification shall be met incontinuous mass production for stock, a
39、nd 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 individual heat of steel in each lot shall bemaintained. The containers shall be coded
40、to permit identifi-cation of the lot.TABLE 2 Chemical RequirementsAlloyGroupUNSDesignationAlloyComposition, % maximum except 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
41、.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 1.00 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.
42、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 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 . . .1 S31600 316 0.08 2
43、.00 0.045 0.030 1.00 16.0 to 18.0 10.0 to 14.0 . . . 2.0 to 3.01 S31603 316L 0.03 2.00 0.045 0.030 1.00 16.0 to 18.0 10.0 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
44、may be furnished only when approved by the purchaser.BAt manufacturers option, determined only when intentionally added.TABLE 3 Mechanical Testing RequirementsItem Product LengthHardnessTest Conducted Using Full SizeProductTest Conducted Using Machined Test Specificationmax min Extension Axial Tensi
45、leStrengthYield Strength0.2 % offsetTensileStrengthElongation1 #3 DAB B. . . . .2D-12 in.B.BB. . .3 Over 12 in.B. AABBBAD 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
46、size tests, denoted A, shallbe decisive.F 837 02ae1312.2 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.12.3 When tests of individual shipments are required,Supple
47、mentary 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 samples, shallconsist of all products offered for inspection and testing, at one
48、time, 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 ofSamples8
49、00 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 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.12.3.1.4 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.12.4 Corrosion Resistance
