1、Designation: F837 08F837 13Standard 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
2、 in parentheses 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.1. Scope Scope*1.1 This specification covers the chemical and mechani
3、cal requirements for stainless steel inch socket head cap screw (SHCS)with nominal thread 0.060 through 1.500 in. and intended for use in applications requiring general corrosion resistance.1.2 Three groups of stainless steel alloys are covered, austenitic Group 1 and 2 and martensitic Group 5.1.3 F
4、our property conditions are covered: austenitic Alloy Groups 1 and 2 in an annealed condition (AF) at 85 ksi maximum,in two cold worked conditions (CW) at 80 ksi minimum, (CW1) at 102 ksi minimum, and martensitic Alloy Group 5 in a heattreated condition (HT) at 160 ksi minimum.1.4 The values stated
5、in inch-pound units are to be regarded as standard. The values given in parentheses are mathematicalconversions to SI units that are provided for information only and are not considered No other units of measurement are includedin this standard.1.5 The following precautionary caveat pertains only to
6、 the test method portion, Section 13, of this specification: This standarddoes not purport to address all of the safety concerns, if any, associated with its use. It is the responsibility of the user of thisstandard to establish appropriate safety and health practices and determine the applicability
7、 of regulatory limitations prior to use.2. Referenced Documents2.1 ASTM Standards:2A262 Practices for Detecting Susceptibility to Intergranular Attack in Austenitic Stainless SteelsA342/A342M Test Methods for Permeability of Feebly Magnetic MaterialsA380 Practice for Cleaning, Descaling, and Passiva
8、tion of Stainless Steel Parts, Equipment, and SystemsA555/A555M Specification for General Requirements for Stainless Steel Wire and Wire RodsA751 Test Methods, Practices, and Terminology for Chemical Analysis of Steel ProductsA967 Specification for Chemical Passivation Treatments for Stainless Steel
9、 PartsD3951 Practice for Commercial PackagingE18 Test Methods for Rockwell Hardness of Metallic MaterialsE92 Test Method for Vickers Hardness of Metallic Materials (Withdrawn 2010)3E384 Test Method for Knoop and Vickers Hardness of MaterialsF606 Test Methods for Determining the Mechanical Properties
10、 of Externally and Internally Threaded Fasteners, Washers, DirectTension Indicators, and RivetsF788/F788M Specification for Surface Discontinuities of Bolts, Screws, and Studs, Inch and Metric SeriesF1470 Practice for Fastener Sampling for Specified Mechanical Properties and Performance Inspection2.
11、2 ASME Standard:ASME B18.3 Socket Cap, Shoulder, and Set ScrewsInch Series42.3 JIS Standard:JIS G 4311 Heat Resisting Steel Bar and Wire Rods41 This specification is under the jurisdiction of ASTM Committee F16 on Fasteners and is the direct responsibility of Subcommittee F16.04 on Nonferrous Fasten
12、ers.Current edition approved July 1, 2008Nov. 1, 2013. Published July 2008December 2013. Originally approved in 1988. Last previous edition approved in 20022008 asF837 02aF837 08.1. DOI: 10.1520/F0837-08.10.1520/F0837-13.2 For referencedASTM standards, visit theASTM website, www.astm.org, or contact
13、ASTM Customer Service at serviceastm.org. For Annual Book of ASTM Standardsvolume information, refer to the standards Document Summary page on the ASTM website.3 The last approved version of this historical standard is referenced on www.astm.org.4 Available from Global Engineering Documents, 15 Inve
14、rness Way, East Englewood, CO 80112-5704, http:/.This document is not an ASTM standard and is intended only to provide the user of an ASTM standard an indication of what changes have been made to the previous version. Becauseit may not be technically possible to adequately depict all changes accurat
15、ely, ASTM recommends that users consult prior editions as appropriate. In all cases only the current versionof the standard as published by ASTM is to be considered the official document.*A Summary of Changes section appears at the end of this standardCopyright ASTM International, 100 Barr Harbor Dr
16、ive, PO Box C700, West Conshohocken, PA 19428-2959. United States13. Classification3.1 The austenitic stainless steel socket head cap screw shall be designated F837 Group 1 or 2 Condition AF, F837 Group 1 or2 Condition CW, or F837 Group 1 or 2 Condition CW1.3.2 The martensitic stainless steel socket
17、 head cap screw shall be designated F837 Group 5 Condition HT.4. Ordering Information4.1 Orders for socket head cap screws under this specification 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
18、pitch, thread class, screw length) or part number.4.1.4 Alloy Group (see 7.1) and Condition (Group 1 or 2 AF, 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 of issue is not specified, fasteners shall be furnished to the latest issue.4.1.6 Supp
19、lementary requirements, if any, (see S1 through S7).4.1.7 Additional special requirements, if any, to be specified on 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 (see 12.2).4.1.7.6 Ad
20、ditional 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 the head and socket
21、 recess of the screw may be hot forged, cold forged, or machinedat the option of the manufacturer. Users requiring cold forged heads should specify Supplementary Requirements S1.S6.5.2 ThreadsUnless otherwise specified, screws in sizes up to 1.00 in. inclusive and product lengths up to 6 in. inclusi
22、ve, shallhave threads formed by rolling, except by special agreement with the purchaser. Larger products may be rolled, cut, or ground atthe option of the manufacturer.6. Heat Treatment6.1 Austenitic alloys Group 1 or 2 Condition AF screws, following manufacture, shall be annealed by heating to 1900
23、 6 50Fto obtain maximum corrosion resistance and minimum permeability. The screws shall be held for a sufficient time at temperatureand then cooled at a rate sufficient to prevent precipitation of the carbide and to provide the properties specified in Table 1.6.2 When Condition CW or CW1 is specifie
24、d, the austenitic alloys shall be annealed as specified in 6.1 generally by the rawmaterial manufacturer, then cold worked to develop specific properties.TABLE 1 Mechanical Property RequirementsAlloyGroup ConditionAlloyMechanicalPropertyMarkingNominalThreadDiameterAFull-Size Product Machine Specimen
25、 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 0.0600.750 102 min 0.4D 8
26、7 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 . . . . . . . . . . . . 350
27、423 3643 HRC5 HT F837H 0.2501.500 180 min 0.2D 160 min 120 min 12 350423 3643 HRCA For CW and CW1 condition fasteners with nominal thread diameter larger than 0.750 in., the mechanical properties and marking shall be agreed upon between the userand manufacturer.B Core hardness is only required when
28、full-size product tensile testing cannot be accomplished.C D denotes nominal thread size.F837 1326.3 Martensitic alloy Group 5 Condition HT screws shall be hardened and tempered by heating to 1800 6 50F sufficient foraustenitization, holding for at least 12 h, rapid air or oil quenching, reheating t
29、o 525F minimum and holding for at least 1 h andthen air cooling to provide the properties specified in Table 1.7. Chemical Properties7.1 It is the intent of this specification that screws shall be ordered by alloy group and condition. The chemical composition ofthe screw material shall conform to th
30、e requirements of Table 2.7.2 Unless otherwise specified in the inquiry and purchase order (see Supplementary Requirements S2) the choice of an alloyfrom within a group shall be at the discretion of the fastener manufacturer as required by their method of fastener fabrication andmaterial availabilit
31、y. The specific alloy used by the manufacturer shall be clearly identified on all certification required in thepurchase order and shall have chemical composition conforming to the limits specified in Table 2.7.3 When chemical analysis is performed by the purchaser using finished fasteners representi
32、ng each lot, the chemical contentsobtained shall conform to the limits specified in Table 2 for the specific alloy. Chemical contents shall conform to the tolerancesspecified in Specification A555/A555M.7.3.1 In the event of discrepancy, a referee analysis as specified in 13.1 of samples for each lo
33、t shall be made in accordance with12.3.1.8. Mechanical Properties8.1 Screws shall be tested in accordance with the mechanical testing requirements for the alloy group and condition nominalthread diameter, length, and specified minimum tensile strength as specified in Table 3 and shall meet the mecha
34、nical requirementsspecified for that product in Table 1.8.2 For products on which both hardness and tension tests are performed, acceptance based on tensile requirements shall takeprecedence over low hardness readings (see Table 4).9. Corrosion Resistance9.1 Carbide Precipitation:9.1.1 Rod, bar, and
35、 wire in the austenitic alloy groups 1 and 2 (not including the free-machining grade 303) used to makefasteners in accordance with this specification shall be capable of passing the test for susceptibility to intergranular corrosion asspecified in Practice E of Practice A262.9.1.2 As stated in Pract
36、ices A262, samples may be subjected to the faster and more severe screening test in accordance withPractice A. Failing Practice A, specimens shall be tested to Practice E and be considered satisfactory if passing Practice E.10. Dimensions10.1 Unless otherwise specified, the products shall conform to
37、 the requirements of ASME B18.3.11. Workmanship, Finish, and Appearance11.1 Surface TreatmentUnless otherwise specified, screws shall be cleaned, descaled and passivated in accordance withPractice A380 or Specification A967 at the option of the manufacturer.TABLE 2 Chemical RequirementsAlloyGroupUNS
38、Designation AlloyComposition, % maximum except as shownCarbon Manganese Phosphorus Sulfur Silicon Chromium Nickel Copper MolybdenumAustenitic Alloys1 S30300 303A 0.15 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
39、 . . .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 19.0 . . . . . .1 S20300 XM1A 0.08 5.0 to 6.5 0.040 0.18 to 0.35 1.00 16.0 to 18
40、.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 . 304J3C 0.08 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
41、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 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 . . .A Free machining grades are not recommended for forged product. These grade
42、s may be furnished only when approved by the purchaser.B At manufacturers option, determined only when intentionally added.C304J3 from JIS standard G 4311.F837 13311.2 The surface discontinuities for these products shall conform to Specification F788/F788M and the additional limitationsspecified her
43、ein.11.2.1 Forging defects that connect the socket to the periphery of the head are not permissible. Defects originating on theperiphery and with a traverse indicating a potential to intersect are not permissible. Other forging defects are permissible providedthose located in the bearing area, fille
44、t, and top surfaces shall not have a depth exceeding 0.03 D or 0.005 in, whichever is greater.For peripheral discontinuities, the maximum depth may be 0.06 D (see Fig. 1).11.2.2 Forging defects located in the socket wall within 0.1 times the actual key engagement, T, from the bottom of the socketare
45、 not permissible. Discontinuities located elsewhere in the socket shall not have a length exceeding 0.25 T, or a maximum depthof 0.03 D not to exceed 0.005 in. (see Fig. 2).TABLE 3 Mechanical Testing RequirementsItem Product LengthHardness Test Conducted Using Full SizeProduct Test Conducted Using M
46、achined Test Specificationmax min Extension Axial TensileStrengthYield Strength0.2 % offsetTensileStrengthElongation1 #3 D A B B . . . . . . . . . . . . . . .2 3 D-12 in. B . . . B B . . . . . . . . .3 Over 12 in. B . . . A A B B BA D denotes nominal diameter of product.B Denotes mandatory test. In
47、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, shall bedecisive.TABLE 4 Tensile Strength Values for Full-Size Fasteners, lbsNominalSize Stress AreaAlloy Groups 1 and 2 AlloyGroup 5AF max CW min CW1 min HT min0.
48、060-80 0.00180 153 144 183 2880.073-64 0.00263 223 210 267 4200.073-72 0.00278 236 222 283 4440.086-56 0.00370 314 296 377 5920.086-64 0.00394 334 315 401 6300.099-48 0.00487 414 390 497 7790.099-56 0.00523 445 418 533 8370.112-40 0.00604 513 483 615 9660.112-48 0.00661 562 529 674 1 0600.125-40 0.0
49、0796 676 636 811 1 2700.125-44 0.00830 706 665 848 1 3300.138-32 0.00909 772 727 927 1 4500.138-40 0.01015 862 811 1 035 1 6200.164-32 0.0140 1 191 1 121 1 429 2 2400.164-36 0.01474 1 252 1 178 1 502 2 3600.190-24 0.0175 1 490 1 403 1 788 2 8000.190-32 0.0200 1 699 1 600 2 039 3 2000.250-20 0.0318 2 705 2 546 3 246 5 0900.250-28 0.0364 3 092 2 910 3 710 5 8200.312-18 0.0524 4 457 4 194 5 348 8 3800.312-24 0.0580 4 936 4 645 5 923 9 2800.375-16 0.0775 6 587 6 199 7 904 12 4000.375-24 0.0878 7 465 7 026 8 958 14 0000.437-14 0.1063 9 036 8
