ASTM F880-12(2017)
(Specification)Standard Specification for Stainless Steel Socket, Square Head, and Slotted Headless-Set Screws
Standard Specification for Stainless Steel Socket, Square Head, and Slotted Headless-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 1.000 in. square head set screws (SHSS) sizes 0.190 through 1.500 in., and slotted headless set screws (HSS) 0.060 through 0.750 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 developed—F880M; 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 concerns, if any, associated with its use. It is the responsibility of the user of this standard to establish appropriate safety, health, and environmental practices and determine the applicability of regulatory limitations prior to use.
1.4 This international standard was developed in accordance with internationally recognized principles on standardization established in the Decision on Principles for the Development of International Standards, Guides and Recommendations issued by the World Trade Organization Technical Barriers to Trade (TBT) Committee.
General Information
Relations
Standards Content (Sample)
This international standard was developed in accordance with internationally recognized principles on standardization established in the Decision on Principles for the
Development of International Standards, Guides and Recommendations issued by the World Trade Organization Technical Barriers to Trade (TBT) Committee.
Designation: F880 − 12 (Reapproved 2017)
Standard Specification for
Stainless Steel Socket, Square Head, and Slotted Headless-
Set Screws
This standard is issued under the fixed designation F880; 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 U.S. Department of Defense.
1. Scope* A342/A342M Test Methods for Permeability of Weakly
Magnetic Materials
1.1 This specification covers the requirements for austenitic
A380 Practice for Cleaning, Descaling, and Passivation of
grade stainless steel socket-set screws (SSS) sizes 0.060
Stainless Steel Parts, Equipment, and Systems
through 1.000 in. square head set screws (SHSS) sizes 0.190
A555/A555M Specification for General Requirements for
through 1.500 in., and slotted headless set screws (HSS) 0.060
Stainless Steel Wire and Wire Rods
through 0.750 in., in two conditions, AF and CW.
A751 Test Methods and Practices for Chemical Analysis of
1.2 Units—The values stated in inch-pound units are to be
Steel Products
regarded as standard. No other units of measurement are
A967 Specification for Chemical Passivation Treatments for
included in this standard.
Stainless Steel Parts
D3951 Practice for Commercial Packaging
NOTE 1—A complete metric companion to Specification F880 has been
developed—F880M; therefore, no metric equivalents are shown in this E18 Test Methods for Rockwell Hardness of Metallic Ma-
specification.
terials
1.3 The following hazards caveat pertains only to Test F593 Specification for Stainless Steel Bolts, Hex Cap
Method Section, Section 12 of this specification. This standard
Screws, and Studs
does not purport to address all of the safety concerns, if any, F788/F788M Specification for Surface Discontinuities of
associated with its use. It is the responsibility of the user of this
Bolts, Screws, Studs, and Rivets, Inch and Metric Series
standard to establish appropriate safety, health, and environ- F1470 Practice for Fastener Sampling for Specified Me-
mental practices and determine the applicability of regulatory
chanical Properties and Performance Inspection
limitations prior to use.
2.2 ASME Standard:
1.4 This international standard was developed in accor-
B 18.3 Socket Cap, Shoulder and Set Screws, Inch Series
dance with internationally recognized principles on standard-
B 18.6.2 Slotted Head Cap Screws, Square Head Set Screws,
ization established in the Decision on Principles for the
and Slotted Headless Set Screws (Inch Series)
Development of International Standards, Guides and Recom-
mendations issued by the World Trade Organization Technical
3. Classification
Barriers to Trade (TBT) Committee.
3.1 The designation of the alloy group and condition for the
two materials and conditions of this specification shall be
2. Referenced Documents
consistent with the stainless steel designations in Specification
2.1 ASTM Standards:
F593.
A262 Practices for Detecting Susceptibility to Intergranular
3.2 The austenitic stainless steel socket set screw shall be
Attack in Austenitic Stainless Steels
designated F880 Group 1 Condition AF (solution annealed) or
F880 Group 1 Condition CW (cold worked).
This specification is under the jurisdiction of ASTM Committee F16 on
4. Ordering Information
Fasteners and is the direct responsibility of Subcommittee F16.04 on Nonferrous
4.1 Orders for material under this specification shall include
Fasteners.
Current edition approved Dec. 1, 2017. Published December 2017. Originally
the following information:
approved in 1986. Last previous edition approved in 2012 as F880 -12. DOI:
4.1.1 Quantity (number of screws);
10.1520/F0880-12R17.
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 from American National Standards Institute (ANSI), 25 W. 43rd St.,
the ASTM website. 4th Floor, New York, NY 10036, http://www.ansi.org.
*A Summary of Changes section appears at the end of this standard
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959. United States
F880 − 12 (2017)
4.1.2 Dimensions, including nominal thread designation, 6.2 Unless otherwise specified in the inquiry and purchase
thread pitch, nominal screw length (inches) and point configu- order (see Supplementary Requirement S2), the choice of alloy
ration. A standard part number may be used for this definition; used shall be that of the fastener manufacturer as determined
4.1.3 Name of the screw (SSS, SHSS or HSS); by his fabrication methods and material availability. The
4.1.4 Condition AF/CW; specific alloy used by the manufacturer shall be clearly
4.1.5 Surface finish, if required. If a finish other than identified on all certification required in the purchase order and
passivation is required, it must be specified on the order or shall have a chemical composition conforming to the limits
product standard; specified in Table 2.
4.1.6 ASTM specification and year of issue; and
6.3 When chemical analysis is performed by the purchaser
4.1.7 Any special or supplemental requirements.
using finished fasteners representing each lot, the chemical
4.1.8 If torque testing is required for socket set screws sizes
contents obtained shall conform to the limits specified in Table
over ⁄2 inch.
2 for the specific alloy. Chemical composition shall conform to
4.2 Example—50 000 pieces 0.250-20 × 0.375 cone point the tolerances specified in Specification A555/A555M.
SSS CW ASTM F880 – XX. 6.3.1 In the event of a discrepancy, a referee analysis of the
samples for each lot as specified in 12.1 shall be made in
accordance with 11.3.1.
5. Materials and Manufacture
5.1 The screw may be forged, formed, extruded, machined,
7. Mechanical Properties
or ground to meet the dimensional characteristics and perfor-
7.1 Socket-set screws, when subjected to a torque test in
mance requirements.
accordance with 12.3.1, shall withstand application of the test
5.2 Heat Treatment—Austenitic alloys Group 1 Condition
tightening torque specified in Table 1 without evidence of the
AF screw shall be annealed by heating to 1900 6 50°F to
socket reaming or the screw bursting. Socket set screws in
obtain maximum corrosion resistance and minimum perme-
sizes in nominal diameters over ⁄2 in. are not subject to torques
ability. The screws shall be held for a sufficient time at
testing unless required by purchaser. The test torque values
temperature, then cooled at a rate sufficient to prevent precipi-
must be supplied by purchaser and agreed to by the supplier.
tation of the carbide and provide the properties in accordance
7.2 The hardness limits from 70 to 95 HRB (125 to 210
with Table 1.
DPH) for Condition AF and 96 HRB to 33 HRC (216 to 327
5.3 When condition CW is specified, the austenitic alloys
DPH) for Condition CW shall be met as determined using Test
shall be annealed as specified in 5.2, generally by the raw
Methods E18.
material manufacturer, and then cold worked to develop
specific properties.
8. Corrosion Resistance Requirements
8.1 Carbide Precipitation:
6. Chemical Composition
8.1.1 Rod, bar, and wire in the austenitic alloy groups 1, 2,
6.1 The analysis of the screw material shall conform to the and 3, except the free-machining grades, 303 and 303Se, used
to make fasteners in accordance with this specification shall be
chemical composition specified in Table 2.
A
TABLE 1 Socket Set Screw 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, in. AF CW
in.
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 0.172 0.188 0.172 3 5
6 0.138 0.188 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
⁄8 0.625 0.625 0.875 0.875 . .
⁄4 0.750 0.750 1.000 1.000 . .
⁄8 0.875 0.875 1.000 1.000 . .
1 1.000 1.100 1.250 1.250 . .
A
For socket set screw sizes over ⁄2 inch, torsional strength testing is not required unless specified by purchaser. The test torque values must be supplied by purchaser
and agreed upon by the supplier.
F880 − 12 (2017)
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 . . .
S31600 316 0.03 2.00 0.045 0.030 1.00 16.0 to 18.0 10.0 to 14.01 . 2.0 to 3.0
S31603 316L 0.03 2.00 0.045 0.03 1.00 16.0 to 18.0 10.0 to 14.01 . 2.0 to 3.0
A
At the manufacturer’s option, determined only when intentionally added.
capable of passing the test for susceptibility to intergranular 11.3 When tests of individual shipments are required,
corrosion as specified in Practice E of Practices A262. Supplementary Requirement S1 must be specified in the
8.1.2 As stated in Practices A262, samples may be subjected inquiry and order.
to the faster and more severe screening test in accordance with
11.3.1 When the purchaser does not specify the sampling
Practice A. Failing Practice A, specimens shall be tested to plan and basis of acceptance, the following shall apply.
Practice E and be considered satisfactory if passing Practice E.
11.3.1.1 The lot, for purposes of selecting samples, shall
consist of all products offered for inspection and testing at one
9. Dimensions
time, that are of the same style, nominal diameter, thread pitch,
nominal length, material type, and condition, and surface
9.1 Unless otherwise specified, the product shall conform to
finish.
the requirements of ASME B 18.3 or B 18.6.2 as applicable.
11.3.1.2 From each lot, samples shall be selected at random
and tested for each requirement in accordance with the
10. Workmanship, Finish, and Appearance
following:
10.1 Surface Treatment—Unless otherwise specified, screws
Number of
shall be cleaned, descaled, and passivated in accordance with
Number of Pieces in Lot Samples
Practice A380 or Specification A967 at the option of the
800 and less 1
manufacturer.
Over 800 to 8000, incl 2
10.2 Surface Discontinuities:
Over 8000 to 22 000, incl 3
Over 22 000 5
10.2.1 The surface discontinuities for these products shall
conform to Specification F788/F788M and the additional
11.3.1.3 Should any sample fail to meet the requirements of
limitations specified herein.
a specified test, double the number of samples from the same
10.2.1.1 Processing cracks that connect the socket to the
lot shall be retested for the requirement(s) in which it failed.
periphery of the screw are not permissible. Defects originating
All of the additional samples shall conform to the specification
on the periphery with a traverse indicating a potential to
or the lot shall be rejected.
intersect are not permissible. For peripheral discontinuities, 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
11. Number of Tests
submitted.
11.1 The requirements of this specification shall be met in
11.4 Corrosion Resistance Tests:
continuous mass production for stock and the manufacturer
11.4.1 Unless otherwise specified, inspection for corrosion
shall make sample inspections to ensure that the product
resistance shall be in accordance with the manufacturer’s
conforms to the specified requirements. Additional tests of
standard quality control practices. No specific method of
individual shipments of fasteners are not ordinarily necessary.
inspection is required but the screws shall be produced from
A record of the individual heat of steel in each lot shall be
suitable raw material and manufactured by properly controlled
maintained. The containers shall be coded to permit identifi-
practices to maintain resistance to corrosion. When corrosion
cation of the lot.
tests are required, Supplementary Requirement S4 must be
specified in the inquiry and order except as noted in 11.4.2.
11.2 When specified in the purchase order, the manufacturer
shall furnish a test report of the last complete set of chemical 11.4.2 Products that have been hot worked shall be solution
analysis and mechanical tests for each stock size in each annealed and tested to determine freedom from precipitated
shipment. carbides. Not less than one corrosion test shall be made from
F880 − 12 (2017)
each lot. Corrosion tests shall be performed in accordance with 13.2 The inspector representing the purchaser shall have
Practices A262, Practices A or E as applicable. free entry to all parts of the manufacturer’s works that concern
the manufacture of the material ordered. The manufacturer
12. Test Methods
shall afford the inspector all reasonable facilities to satisfy that
the material is being furnished in accordance with this speci-
12.1 Chemical Analysis—The chemical composition shall
be determined in accordance with Test Methods, Practices, and fication. All tests and inspection required by the specification
that are requested by the purchaser’s representative and pur-
Terminology A751.
chase order shall be made prior to shipment and shall be so
12.2 The fastener manufacturer may accept the chemi
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