ASTM F880-02(2008)e1
(Specification)Standard Specification for Stainless Steel Socket-Set Screws
Standard Specification for Stainless Steel Socket-Set Screws
ABSTRACT
This specification covers the requirements for austenitic grade stainless steel socket set screws (SSS), sizes M1.6 through M24, having property classes A1-50 and A1-70. The analysis of the screw material shall conform to the chemical composition specified. Socket set screw shall be subjected to torque test, Vickers hardness test, and corrosion resistance test to meet the requirements prescribed.
SCOPE
1.1 This specification covers the requirements for austenitic grade stainless steel socket-set screws (SSS) sizes 0.060 through 0.500 in., in two conditions, AF and CW.
1.2 Units—The values stated in inch-pound units are to be regarded as standard. No other units of measurement are included in this standard.
Note 1—A complete metric companion to Specification F880 has been developedF880M; therefore, no metric equivalents are shown in this specification.
1.3 The following hazards caveat pertains only to Test Method Section, Section 12 of this specification. This standard does not purport to address (all of) the safety problems associated with its use. It is the responsibility of the user of this standard to establish appropriate safety and health practices and determine the applicability of regulatory limitations prior to use.
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Designation:F880 −02(Reapproved 2008)
Standard Specification for
Stainless Steel Socket-Set Screws
ThisstandardisissuedunderthefixeddesignationF880;thenumberimmediatelyfollowingthedesignationindicatestheyearoforiginal
adoptionor,inthecaseofrevision,theyearoflastrevision.Anumberinparenthesesindicatestheyearoflastreapproval.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.
´ NOTE—12.3.1 was editorially corrected in February 2012.
1. Scope A967Specification for Chemical PassivationTreatments for
Stainless Steel Parts
1.1 This specification covers the requirements for austenitic
D3951Practice for Commercial Packaging
grade stainless steel socket-set screws (SSS) sizes 0.060
E18Test Methods for Rockwell Hardness of Metallic Ma-
through 0.500 in., in two conditions, AF and CW.
terials
1.2 Units—The values stated in inch-pound units are to be
F593Specification for Stainless Steel Bolts, Hex Cap
regarded as standard. No other units of measurement are
Screws, and Studs
included in this standard.
F788/F788MSpecification for Surface Discontinuities of
Bolts, Screws, and Studs, Inch and Metric Series
NOTE 1—Acomplete metric companion to Specification F880 has been
developed—F880M; therefore, no metric equivalents are shown in this F1470Practice for Fastener Sampling for Specified Me-
specification.
chanical Properties and Performance Inspection
1.3 The following hazards caveat pertains only to Test 2.2 ASME Standard:
MethodSection,Section12ofthisspecification. This standard
B18.3Socket Cap, Shoulder and Set Screws, Inch Series
does not purport to address (all of) the safety problems
3. Classification
associated with its use. It is the responsibility of the user of this
standard to establish appropriate safety and health practices
3.1 Thedesignationofthealloygroupandconditionforthe
and determine the applicability of regulatory limitations prior
two materials and conditions of this specification shall be
to use.
consistent with the stainless steel designations in Specification
F593.
2. Referenced Documents
3.2 The austenitic stainless steel socket set screw shall be
2.1 ASTM Standards:
designated F880 Group 1 ConditionAF (solution annealed) or
A262Practices for Detecting Susceptibility to Intergranular
F880 Group 1 Condition CW (cold worked).
Attack in Austenitic Stainless Steels
A342/A342MTest Methods for Permeability of Feebly
4. Ordering Information
Magnetic Materials
4.1 Ordersformaterialunderthisspecificationshallinclude
A380Practice for Cleaning, Descaling, and Passivation of
the following information:
Stainless Steel Parts, Equipment, and Systems
4.1.1 Quantity (number of screws);
A555/A555MSpecification for General Requirements for
4.1.2 Dimensions, including nominal thread designation,
Stainless Steel Wire and Wire Rods
thread pitch, nominal screw length (inches) and point configu-
A751Test Methods, Practices, and Terminology for Chemi-
ration.Astandard part number may be used for this definition;
cal Analysis of Steel Products
4.1.3 Name of the screw (SSS);
4.1.4 Condition AF/CW;
4.1.5 Surface finish, if required. If a finish other than
This specification is under the jurisdiction of ASTM Committee F16 on
passivation is required, it must be specified on the order or
Fasteners and is the direct responsibility of Subcommittee F16.04 on Nonferrous
Fasteners. product standard;
Current edition approved May 1, 2008. Published August 2008. Originally
4.1.6 ASTM specification and year of issue; and
approved in 1986. Last previous edition approved in 2002 as F880-02. DOI:
4.1.7 Any special or supplemental requirements.
10.1520/F0880-02R08.
For referenced ASTM standards, visit the ASTM website, www.astm.org, or
contact ASTM Customer Service at service@astm.org. For Annual Book of ASTM
Standards volume information, refer to the standard’s Document Summary page on Available fromAmerican National Standards Institute (ANSI), 25 W. 43rd St.,
the ASTM website. 4th Floor, New York, NY 10036, http://www.ansi.org.
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959. United States
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F880−02 (2008)
4.2 Example—50000 pieces 0.250-20 × 0.375 cone point 7. Mechanical Properties
SSS CWASTM F880–XX.
7.1 Socket-set screws, when subjected to a torque test in
accordance with 12.3.1, shall withstand application of the test
5. Materials and Manufacture
tightening torque specified in Table 1 without evidence of the
socket reaming or the screw bursting.
5.1 The screw may be forged, formed, extruded, machined,
or ground to meet the dimensional characteristics and perfor-
7.2 The hardness limits from 70 to 95 HRB (125 to 210
mance requirements.
DPH) for Condition AF and 96 HRB to 33 HRC (216 to 327
DPH) for Condition CWshall be met as determined usingTest
5.2 Heat Treatment—Austenitic alloys Group 1 Condition
AF screw shall be annealed by heating to 1900 6 50°F to Methods E18.
obtain maximum corrosion resistance and minimum perme-
ability. The screws shall be held for a sufficient time at 8. Corrosion Resistance Requirements
temperature, then cooled at a rate sufficient to prevent precipi-
8.1 Carbide Precipitation:
tation of the carbide and provide the properties in accordance
8.1.1 Rod, bar, and wire in the austenitic alloy groups 1, 2,
with Table 1.
and 3, except the free-machining grades, 303 and 303Se, used
5.3 When condition CW is specified, the austenitic alloys tomakefastenersinaccordancewiththisspecificationshallbe
shall be annealed as specified in 5.2, generally by the raw capable of passing the test for susceptibility to intergranular
material manufacturer, and then cold worked to develop corrosion as specified in Practice E of Practices A262.
specific properties. 8.1.2 AsstatedinPracticesA262,samplesmaybesubjected
to the faster and more severe screening test in accordance with
6. Chemical Composition Practice A. Failing Practice A, specimens shall be tested to
PracticeEandbeconsideredsatisfactoryifpassingPracticeE.
6.1 The analysis of the screw material shall conform to the
chemical composition specified in Table 2.
9. Dimensions
6.2 Unless otherwise specified in the inquiry and purchase
9.1 Unlessotherwisespecified,theproductshallconformto
order(seeSupplementaryRequirementS2),thechoiceofalloy
the requirements of ASME B18.3.
used shall be that of the fastener manufacturer as determined
by his fabrication methods and material availability. The
10. Workmanship, Finish, and Appearance
specific alloy used by the manufacturer shall be clearly
identifiedonallcertificationrequiredinthepurchaseorderand 10.1 Surface Treatment—Unlessotherwisespecified,screws
shall have a chemical composition conforming to the limits shall be cleaned, descaled, and passivated in accordance with
specified in Table 2. Practice A380 or Specification A967 at the option of the
manufacturer.
6.3 When chemical analysis is performed by the purchaser
using finished fasteners representing each lot, the chemical 10.2 Surface Discontinuities:
contentsobtainedshallconformtothelimitsspecifiedinTable 10.2.1 The surface discontinuities for these products shall
2forthespecificalloy.Chemicalcompositionshallconformto conform to Specification F788/F788M and the additional
the tolerances specified in Specification A555/A555M. limitations specified herein.
6.3.1 In the event of a discrepancy, a referee analysis of the 10.2.1.1 Processing cracks that connect the socket to the
samples for each lot as specified in 12.1 shall be made in periphery of the screw are not permissible. Defects originating
accordance with 11.3.1. on the periphery with a traverse indicating a potential to
TABLE 1 Torsional Strength Requirements
Nominal Screw Size Shortest Nominal Screw Lengths Subject to Torque Testing Test Torque, in.-lb, min
Cup and Flat Points, Cone and Oval Points Half Dog Points, mm AF CW
mm
0 0.060 0.109 0.125 0.109 0.3 0.6
1 0.073 0.125 0.141 0.125 0.7 1.2
2 0.086 0.125 0.141 0.141 0.7 1.2
3 0.099 0.141 0.156 0.156 1.6 3.3
4 0.112 0.141 0.172 0.156 1.6 3.3
5 0.125 0.188 0.188 0.172 3 5
6 0.138 0.172 0.203 0.188 3 5
8 0.164 0.188 0.219 0.203 9 16
10 0.190 0.188 0.250 0.234 16 26
⁄4 0.250 0.250 0.312 0.297 40 67
⁄16 0.312 0.312 0.391 0.359 79 135
⁄8 0.375 0.375 0.438 0.438 138 237
⁄16 0.437 0.438 0.547 0.484 220 378
⁄2 0.500 0.500 0.609 0.547 358 600
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F880−02 (2008)
TABLE 2 Chemical Requirements
Composition, % maximum except as shown
UNS
Alloy
Molybdenum
Designation
Carbon Manganese Phosphorus Sulfur Silicon Chromium Nickel Copper
Austenitic Alloys
A
S30300 303 0.15 2.00 0.20 0.15 min 1.00 17.0 to 19.0 8.0 to 10.0 0.60 max
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 min
S30400 304 0.08 2.00 0.045 0.030 1.00 18.0 to 20.0 8.0 to 10.5 1.00 . . .
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 . . .
A
S20300 XM1 0.08 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 max
S30430 18–9LW 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 . . .
S30433 302HQ 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 . . .
A
At the manufacturer’s option, determined only when intentionally added.
intersectarenotpermissible.Forperipheraldiscontinuities,the 11.3.1.4 If the failure of a test specimen is due to improper
maximum depth may be 0.06 D. preparation of the specimen or an incorrect testing technique,
the specimen shall be discarded and another test specimen
submitted.
11. Number of Tests
11.1 The requirements of this specification shall be met in 11.4 Corrosion Resistance Tests:
continuous mass production for stock an
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