1、Designation: F837 131Standard Specification forStainless Steel Socket Head Cap Screws1This standard is issued under the fixed designation F837; the number immediately following the designation indicates the year of originaladoption or, in the case of revision, the year of last revision.Anumber in pa
2、rentheses indicates the year of last reapproval.Asuperscriptepsilon () 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.1NOTES9 Mechanical Property Requirements was editorially corrected in March
3、 2014.1. Scope*1.1 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 Three groups of stainless steel alloys a
4、re covered,austenitic Group 1 and 2 and martensitic Group 5.1.3 Four property conditions 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 t
5、reated condition (HT) at 160 ksi minimum.1.4 The values stated in inch-pound units are to be regardedas standard. No other units of measurement are included in thisstandard.1.5 The following precautionary caveat pertains only to thetest method portion, Section 13, of this specification: Thisstandard
6、 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 St
7、andards:2A262 Practices for Detecting Susceptibility to IntergranularAttack in Austenitic Stainless SteelsA342/A342M Test Methods for Permeability of FeeblyMagnetic MaterialsA380 Practice for Cleaning, Descaling, and Passivation ofStainless Steel Parts, Equipment, and SystemsA555/A555M Specification
8、 for General Requirements forStainless Steel Wire and Wire RodsA751 Test Methods, Practices, and Terminology for Chemi-cal Analysis of Steel ProductsA967 Specification for Chemical Passivation Treatments forStainless Steel PartsD3951 Practice for Commercial PackagingE18 Test Methods for Rockwell Har
9、dness of Metallic Ma-terialsE92 Test Method for Vickers Hardness of Metallic Materials(Withdrawn 2010)3E384 Test Method for Knoop and Vickers Hardness ofMaterialsF606 Test Methods for Determining the Mechanical Proper-ties of Externally and Internally Threaded Fasteners,Washers, Direct Tension Indic
10、ators, and RivetsF788/F788M Specification for Surface Discontinuities ofBolts, Screws, and Studs, Inch and Metric SeriesF1470 Practice for Fastener Sampling for Specified Me-chanical Properties and Performance Inspection2.2 ASME Standard:ASME B18.3 Socket Cap, Shoulder, and Set ScrewsInchSeries42.3
11、JIS Standard:JIS G 4311 Heat Resisting Steel Bar and Wire Rods43. Classification3.1 The austenitic stainless steel socket head cap screw shallbe designated F837 Group 1 or 2 Condition AF, F837 Group 1or 2 Condition CW, or F837 Group 1 or 2 Condition CW1.3.2 The martensitic stainless steel socket hea
12、d cap screwshall be designated F837 Group 5 Condition HT.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 Nov. 1, 2013. Published December 2013. Originallyapproved i
13、n 1988. Last previous edition approved in 2008 as F837 08. DOI:10.1520/F0837-13E01.2For 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 to the standards Document Summary pa
14、ge 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:/.*A Summary of Changes section appears at the end of this standardCopyright ASTM International
15、, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959. United States14. 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).4.1.3 Size (
16、nominal diameter, thread pitch, thread class,screw length) or part number.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 ofissue is not specified, fasteners shall be furnished to the l
17、atestissue.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).4.1.7.4 Alloy selection (see 7.2).4.1.7.5 Test report (s
18、ee 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. Materials and Manufacture5.1 HeadsUnless otherwise specified
19、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 RequirementsS6.5.2 ThreadsUnless otherwise specified, screws in sizes upto 1.00 in. inclusive and product lengths up to 6
20、 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 AF screws,following manufacture, shall be annealed by hea
21、ting 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 propertiesspecified in Table 1.6.2 When Condition CW or CW1 is
22、 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 heating to 1800 6 50F sufficientfor austenitization, hol
23、ding 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 screws shall beordered by alloy group and condition. The ch
24、emical 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 discretion of thefastener manufacturer as required by th
25、eir 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 limits specified in Table 2.7.3 When chemical analysis is perf
26、ormed 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 Specification A555/A555M.TABLE 1 Mechanical Property RequirementsA
27、lloyGroupConditionAlloyMechanicalPropertyMarkingNominalThreadDiameterAFull-Size Product 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
28、CW F837B 0.0600.750 80 min 0.4D 80 min 40 min 25 150 min 50 HRA min1 CW1 F837C 0.0600.750 102 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 1
29、02 min 0.4D 87 min 65 min 20 220 min 59 HRA min5 HT F837G 0.0600.190 180 min . . . . . . . . . . . . 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 a
30、nd marking shall be agreed upon between the userand manufacturer.BCore hardness is only required when full-size product tensile testing cannot be accomplished.CD denotes nominal thread size.F837 13127.3.1 In the event of discrepancy, a referee analysis asspecified in 13.1 of samples for each lot sha
31、ll 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 meet themechanica
32、l 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:9.1.1 Rod, bar, and wir
33、e 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 Practice E of Practice A262.9.1.2 As stated in Practices A
34、262, 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.10. Dimensions10.1 Unless otherwise specified, the products shall conformto the requ
35、irements of ASME B18.3.11. Workmanship, Finish, and Appearance11.1 Surface TreatmentUnless otherwise specified, screwsshall be cleaned, descaled and passivated in accordance withPractice A380 or Specification A967 at the option of themanufacturer.11.2 The surface discontinuities for these products s
36、hallconform to Specification F788/F788M 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. Oth
37、er 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 0.06 D (see Fig. 1).11.2.2 Forging defects located in the socket w
38、all 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 in. (see Fig. 2).TABLE 2 Chemical RequirementsAlloyGroupUNSDesign
39、ationAlloyComposition, % maximum except as shownCarbon ManganesePhosphorusSulfur 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 S3
40、0403 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 19.0 . . . . . .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
41、.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 . 304J3C0.08 2.00 0.045 0.030 1.00 17.0 to 19.0 8.0 to 10.5 1.00 to 3.00 .2 S31600 316 0.08 2.00 0.045 0
42、.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 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 furn
43、ished only when approved by the purchaser.BAt manufacturers option, determined only when intentionally added.C304J3 from JIS standard G 4311.TABLE 3 Mechanical Testing RequirementsItem Product LengthHardnessTest Conducted Using Full SizeProductTest Conducted Using Machined Test Specificationmax min
44、Extension Axial TensileStrengthYield 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
45、 of arbitration full size tests, denoted A, shall bedecisive.F837 131311.2.3 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 o
46、r on the flankslocated below the pitch line. Laps are 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
47、limits of 11.2.3.12. Number of Tests12.1 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 fastener
48、s are not ordinarily necessary.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.12.2 When specified in the purchase order, the manufacturershall furnish a test report of the last complete set of chemicalanalys
49、is and mechanical tests for each stock size 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 samples, 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 surfac
