ASTM F880-02(2008)
(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). The austenitic stainless steel socket set screw shall be designated as condition AF (solution annealed) or Condition CW (cold worked). The screw may be forged, formed, extruded, machined, or ground to meet the dimensional characteristics and performance requirements. The analysis of the screw material shall conform to the chemical composition specified. Chemical analysis; socket strength torque test; and corrosion resistance shall be performed to conform with the requirements specified.
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 F 880 has been developed—F 880M; 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
adoption or, in the case of revision, the year of last revision.Anumber in 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. Scope A967 Specification for Chemical Passivation Treatments
for Stainless Steel Parts
1.1 This specification covers the requirements for austenitic
D3951 Practice for Commercial Packaging
grade stainless steel socket-set screws (SSS) sizes 0.060
E18 Test 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
F593 Specification for Stainless Steel Bolts, Hex Cap
regarded as standard. No other units of measurement are
Screws, and Studs
included in this standard.
F788/F788M Specification for Surface Discontinuities of
NOTE 1—Acomplete metric companion to Specification F880 has been
Bolts, Screws, and Studs, Inch and Metric Series
developed—F880M; therefore, no metric equivalents are shown in this
F1470 Practice 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:
Method Section, Section 12 of this specification. This standard
B 18.3 Socket 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 The designation of the alloy group and condition for the
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
A262 Practices for Detecting Susceptibility to Intergranular
F880 Group 1 Condition CW (cold worked).
Attack in Austenitic Stainless Steels
A342/A342M Test Methods for Permeability of Feebly 4. Ordering Information
Magnetic Materials
4.1 Orders for material under this specification shall include
A380 Practice for Cleaning, Descaling, and Passivation of
the following information:
Stainless Steel Parts, Equipment, and Systems
4.1.1 Quantity (number of screws);
A555/A555M Specification 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-
A751 Test Methods, Practices, andTerminology 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.
F880 – 02 (2008)
4.2 Example—50 000 pieces 0.250-20 3 0.375 cone point tightening torque specified in Table 1 without evidence of the
SSS CW ASTM F880 – XX. socket reaming or the screw bursting.
7.2 The hardness limits from 70 to 95 HRB (125 to 210
5. Materials and Manufacture
DPH) for Condition AF and 96 HRB to 33 HRC (216 to 327
5.1 The screw may be forged, formed, extruded, machined,
DPH) for Condition CW shall be met as determined using Test
or ground to meet the dimensional characteristics and perfor-
Methods E18.
mance requirements.
5.2 Heat Treatment—Austenitic alloys Group 1 Condition 8. Corrosion Resistance Requirements
AF screw shall be annealed by heating to 1900 6 50°F to
8.1 Carbide Precipitation:
obtain maximum corrosion resistance and minimum perme-
8.1.1 Rod, bar, and wire in the austenitic alloy groups 1, 2,
ability. The screws shall be held for a sufficient time at
and 3, except the free-machining grades, 303 and 303Se, used
temperature, then cooled at a rate sufficient to prevent precipi-
to make fasteners in accordance with this specification shall be
tation of the carbide and provide the properties in accordance
capable of passing the test for susceptibility to intergranular
with Table 1.
corrosion as specified in Practice E of Practices A262.
5.3 When condition CW is specified, the austenitic alloys
8.1.2 AsstatedinPracticesA262,samplesmaybesubjected
shall be annealed as specified in 5.2, generally by the raw
to the faster and more severe screening test in accordance with
material manufacturer, and then cold worked to develop
Practice A. Failing Practice A, specimens shall be tested to
specific properties.
Practice E and be considered satisfactory if passing Practice E.
6. Chemical Composition
9. Dimensions
6.1 The analysis of the screw material shall conform to the
9.1 Unless otherwise specified, the product shall conform to
chemical composition specified in Table 2.
the requirements of ASME B 18.3.
6.2 Unless otherwise specified in the inquiry and purchase
order (see Supplementary Requirement S2), the choice of alloy
10. Workmanship, Finish, and Appearance
used shall be that of the fastener manufacturer as determined
10.1 Surface Treatment—Unless otherwise specified,
by his fabrication methods and material availability. The
screwsshallbecleaned,descaled,andpassivatedinaccordance
specific alloy used by the manufacturer shall be clearly
with Practice A380 or Specification A967 at the option of the
identified on all certification required in the purchase order and
manufacturer.
shall have a chemical composition conforming to the limits
10.2 Surface Discontinuities:
specified in Table 2.
10.2.1 The surface discontinuities for these products shall
6.3 When chemical analysis is performed by the purchaser
conform to Specification F788/F788M and the additional
using finished fasteners representing each lot, the chemical
limitations specified herein.
contents obtained shall conform to the limits specified in Table
10.2.1.1 Processing cracks that connect the socket to the
2 for the specific alloy. Chemical composition shall conform to
periphery of the screw are not permissible. Defects originating
the tolerances specified in Specification A555/A555M.
on the periphery with a traverse indicating a potential to
6.3.1 In the event of a discrepancy, a referee analysis of the
intersect are not permissible. For peripheral discontinuities, the
samples for each lot as specified in 12.1 shall be made in
maximum depth may be 0.06 D.
accordance with 11.3.1.
7. Mechanical Properties 11. Number of Tests
7.1 Socket-set screws, when subjected to a torque test in 11.1 The requirements of this specification shall be met in
accordance with 12.3.1, shall withstand application of the test continuous mass production for stock and the manufacturer
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
F880 – 02 (2008)
TABLE 2 Chemical Requirements
Composition, % maximum except as shown
UNS
Alloy
Designation
Carbon Manganese Phosphorus Sulfur Silicon Chromium Nickel Copper Molybdenum
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.
shall make sample inspections to ensure that the product practices to maintain resistance to corrosion. When corrosion
conforms to the specified requirements. Additional tests of tests are required, Supplementary Requirement S4 must
...
This document is not anASTM standard and is intended only to provide the user of anASTM standard an indication of what changes have been made to the previous version. Because
it may not be technically possible to adequately depict all changes accurately, ASTM recommends that users consult prior editions as appropriate. In all cases only the current version
of the standard as published by ASTM is to be considered the official document.
Designation:F 880–01a Designation: F 880 – 02 (Reapproved 2008)
Standard Specification for
Stainless Steel Socket-Set Screws
This standard is issued under the fixed designation F 880; the number immediately following the designation indicates the year of
original adoption or, in the case of revision, the year of last revision. A number in parentheses indicates the year of last reapproval. A
superscript 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. 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.
1.2The 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.
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 F 880 has been developed—F 880M; 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.
2. Referenced Documents
2.1 ASTM Standards:
A 262 Practices for Detecting Susceptibility to Intergranular Attack in Austenitic Stainless Steels
A342 342/A 342M Test Methods for Permeability of Feebly Magnetic Materials
A 380 Practice for Cleaning, Descaling, and Passivation of Stainless Steel Parts, Equipment, and Systems
A 555/A 555M Specification for General Requirements for Stainless and Heat-Resisting Steel Wire and Wire Rods
A 751 Test Methods, Practices, and Terminology for Chemical Analysis of Steel Products
A 967 Specification for Chemical Passivation Treatments for Stainless Steel Parts
D 3951 Practice for Commercial Packaging
E 18Test Methods for Rockwell Hardness and Rockwell Superficial Hardness of Metallic Materials
E353Test Methods for Chemical Analysis of Stainless, Heat-Resisting, Maraging, and Other Similar Chromium-Nickel-Iron
Alloys Test Methods for Rockwell Hardness of Metallic Materials
F 593 Specification for Stainless Steel Bolts, Hex Cap Screws, and Studs
F 788/F 788M Specification for Surface Discontinuities of Bolts, Screws, and Studs, Inch and Metric Series
F 1470 Guide for Fastener Sampling for SpecificSpecified Mechanical Properties and Performance Inspection
2.2 ASME Standard:
B 18.3 Socket Cap, Shoulder and Set Screws, Inch Series
3. Classification
3.1 Thedesignationofthealloygroupandconditionforthetwomaterialsandconditionsofthisspecificationshallbeconsistent
with the stainless steel designations in Specification F 593.
This specification is under the jurisdiction of ASTM Committee F16 on Fasteners and is the direct responsibility of Subcommittee F16.04 on Nonferrous Fasteners.
Current edition approved Oct. 10, 2001. Published November 2001. Originally published as F880-86. Last previous edition F880-01.
Current edition approved May 1, 2008. Published August 2008. Originally approved in 1986. Last previous edition approved in 2002 as F 880 - 02.
Annual Book of ASTM Standards, Vol 01.03.
For referencedASTM standards, visit theASTM website, www.astm.org, or contactASTM Customer Service at service@astm.org. For Annual Book of ASTM Standards
volume information, refer to the standard’s Document Summary page on the ASTM website.
Annual Book of ASTM Standards, Vol 03.04.
Available from American National Standards Institute (ANSI), 25 W. 43rd St., 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.
F 880 – 02 (2008)
3.2 The austenitic stainless steel socket set screw shall be designated F 880 Group 1 ConditionAF (solution annealed) or F 880
Group 1 Condition CW (cold worked).
4. Ordering Information
4.1 Orders for material under this specification shall include the following information:
4.1.1 Quantity (number of screws).screws);
4.1.2 Dimensions, including nominal thread designation, thread pitch, nominal screw length (inches) and point configuration.
A standard part number may be used for this definition.;
4.1.3 Name of the screw (SSS).(SSS);
4.1.4 Condition AF/CW.AF/CW;
4.1.5 Surface finish, if required. If a finish other than passivation is required, it must be specified on the order or product
standard.standard;
4.1.6 ASTM specification and year of issue. issue; and
4.1.7 Any special or supplemental requirements.
4.2 Example—50 000 pieces 0.250-20 3 0.375 cone point SSS CW ASTM F880-XX. F 880 – XX.
5. Materials and Manufacture
5.1 The screw may be forged, formed, extruded, machined, or ground to meet the dimensional characteristics and performance
requirements.
5.2 Heat Treatment—Austenitic alloys Group 1 Condition AF screw shall be annealed by heating to 1900 6 50°F to obtain
maximum corrosion resistance and minimum permeability. The screws shall be held for a sufficient time at temperature, then
cooled at a rate sufficient to prevent precipitation of the carbide and provide the properties in accordance with Table 1.
5.3 When condition CW is specified, the austenitic alloys shall be annealed as specified in 5.2, generally by the raw material
manufacturer, and then cold worked to develop specific properties.
6. Chemical Composition
6.1 The analysis of the screw material shall conform to the chemical composition specified in Table 2.
6.2 Unless otherwise specified in the inquiry and purchase order (see Supplementary Requirement S2), the choice of alloy used
shallbethatofthefastenermanufacturerasdeterminedbyhisfabricationmethodsandmaterialavailability.Thespecificalloyused
by the manufacturer shall be clearly identified on all certification required in the purchase order and shall have a chemical
composition conforming to the limits specified in Table 2.
6.3 When chemical analysis is performed by the purchaser using finished fasteners representing each lot, the chemical contents
obtainedshallconformtothelimitsspecifiedinTable2forthespecificalloy.Chemicalcompositionshallconformtothetolerances
specified in Specification A 555/A 555M.
6.3.1 Intheeventofadiscrepancy,arefereeanalysisofthesamplesforeachlotasspecifiedin12.1shallbemadeinaccordance
with 11.3.1.
7. Mechanical Properties
7.1 Socket-set screws, when subjected to a torque test in accordance with 12.3.1, shall withstand application of the test
tightening torque specified in Table 1 without evidence of the socket reaming or the screw bursting.
7.2 The hardness limits from 70 to 95 HRB (125 to 210 DPH) for Condition AF and 96 HRB to 33 HRC (216 to 327 DPH)
for Condition CW shall be met as determined using Test Methods E 18.
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
F 880 – 02 (2008)
TABLE 2 Chemical Requirements
Composition, % maximum except as shown
UNS
Alloy
Designation
Carbon Manganese Phosphorus Sulfur Silicon Chromium Nickel Copper Molybdenum
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
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
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 .
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 .
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 .
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 .
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 5.0to6.5 0.040 0.18 to 0.35 1.00 16.0 to 18.0 5.0to6.5 1.75 to 2.25 0.50 max
A
S20300 XM1 0.08 5.0to6.5 0.040 0.18 to 0.35 1.00 16.0 to 18.0 5.0to6.5 1.75 to 2.25 0.50 max
S30430† XM7 0.03 2.00 0.045 0.030 1.00 17.0 to 19.0 8.0 to 10.0 3.00 to 4.00 .
S30430 18–9LW 0.10 2.00 0.045 0.030 1.00 17.0 to 19.0 8.0 to 10.0 3.0to4.0 .
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.
† Corrected editorially.
8. Corrosion Resistance Requirements Corrosion Resistance Requirements
8.1 Carbide Precipitation:
8.1.1 Rod, bar, and wire in the austenitic alloy groups 1, 2, and 3, except the free-machining grades, 303 and 303Se, used to
make fasteners in accordance with this specification shall be capable of passing the test for susceptibility to intergranular corrosion
as specified in Practice E of Practices A 262.
8.1.2 As stated in Practices A 262, samples may be subjected to the faster and more severe screening test in accordance with
Practice A. Failing Practice A, specimens shall be tested to Practice E and be considered satisfactory if passing Practice E.
9. Dimensions
9.1 Unless otherwise specified, the product shall conform to the requirements of ASME B 18.3.
10. Workmanship, Finish, and Appearance
10.1 Surface Treatment—Unless otherwise specified, screws shall be cleaned,
...
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