ASTM F880M-02(2015)
(Specification)Standard Specification for Stainless Steel Socket Set Screws (Metric)
Standard Specification for Stainless Steel Socket Set Screws (Metric)
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 M1.6 through M24, having Property Classes A1-50 and A1-70.
1.2 Units—The values stated in SI units are to be regarded as standard. No other units of measurement are included in this standard.
Note 1: This specification is the metric companion of Specification F880.
1.3 The following hazard caveat pertains only to Section 11, the Test Method Section: This standard does not purport to address 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:F880M −02(Reapproved 2015)
Standard Specification for
Stainless Steel Socket Set Screws (Metric)
This standard is issued under the fixed designation F880M; the number immediately following the designation indicates the year of
original adoption or, in the case of revision, the year of last revision.Anumber 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 E18Test Methods for Rockwell Hardness of Metallic Ma-
terials
1.1 This specification covers the requirements for austenitic
E92TestMethodforVickersHardnessofMetallicMaterials
grade stainless steel socket set screws (SSS), sizes M1.6
(Withdrawn 2010)
through M24, having Property Classes A1-50 and A1-70.
E384Test Method for Knoop and Vickers Hardness of
1.2 Units—The values stated in SI units are to be regarded
Materials
asstandard.Nootherunitsofmeasurementareincludedinthis
F738M Specification for Stainless Steel Metric Bolts,
standard.
Screws, and Studs (Withdrawn 2014)
F788/F788MSpecification for Surface Discontinuities of
NOTE 1—This specification is the metric companion of Specification
F880. Bolts, Screws, and Studs, Inch and Metric Series
F880Specification for Stainless Steel Socket, Square Head,
1.3 ThefollowinghazardcaveatpertainsonlytoSection11,
and Slotted Headless-Set Screws
the Test Method Section: This standard does not purport to
F1470Practice for Fastener Sampling for Specified Me-
address the safety problems associated with its use. It is the
chanical Properties and Performance Inspection
responsibility of the user of this standard to establish appro-
priate safety and health practices and determine the applica- 2.2 ASME Standard:
bility of regulatory limitations prior to use. B18.3.6M Metric Series Socket Set Screws R
2. Referenced Documents
3. Classification
2.1 ASTM Standards: 3.1 The designation of the property class for the two
A262Practices for Detecting Susceptibility to Intergranular
materialsandconditionsofthisspecificationshallbeconsistent
Attack in Austenitic Stainless Steels with the stainless steel designations in Specification F738M.
A342/A342MTest Methods for Permeability of Weakly
3.2 The austenitic stainless steel socket set screw shall be
Magnetic Materials
designation F880MA1–50 or F880M A1–70.
A380Practice for Cleaning, Descaling, and Passivation of
Stainless Steel Parts, Equipment, and Systems
4. Ordering Information
A555/A555MSpecification for General Requirements for
4.1 Ordersformaterialunderthisspecificationshallinclude
Stainless Steel Wire and Wire Rods
the following information:
A751Test Methods, Practices, and Terminology for Chemi-
4.1.1 Quantity (number of screws);
cal Analysis of Steel Products
4.1.2 Dimensions, including nominal thread designation,
A967Specification for Chemical PassivationTreatments for
thread pitch, nominal screw length (millimetres) and point
Stainless Steel Parts
configuration. A standard part number may be used for this
D3951Practice for Commercial Packaging
definition;
E3Guide for Preparation of Metallographic Specimens
4.1.3 Name of the screw (SSS);
4.1.4 Property Class A1-50 or A1-70;
4.1.5 Coating, if required. If a finish other than passivation
This specification is under the jurisdiction of ASTM Committee F16 on
Fasteners and is the direct responsibility of Subcommittee F16.04 on Nonferrous
is required, it must be specified on the order or product
Fasteners.
standard;
Current edition approved Sept. 1, 2015. Published November 2015. Originally
approved in 1984. Last previous edition approved in 2008 as F880M–02(2008).
DOI: 10.1520/F0880M-02R15.
2 3
For referenced ASTM standards, visit the ASTM website, www.astm.org, or The last approved version of this historical standard is referenced on
contact ASTM Customer Service at service@astm.org. For Annual Book of ASTM www.astm.org.
Standards volume information, refer to the standard’s Document Summary page on Available from Global Engineering Documents, 15 Inverness Way, East
the ASTM website. Englewood, CO 80112-5704, http://www.global.ihs.com.
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959. United States
F880M−02 (2015)
4.1.6 ASTM designation and year of issue; and 7. Mechanical Properties
4.1.7 Any special or supplemental requirements.
7.1 Socket set screws, when subjected to a torque test in
4.2 Example—50000 pieces M6×1×8 cone point SSS accordance with 12.2.1, shall withstand application of the test
A1-70 ASTM F880M–XX. tightening torque specified in Table 2 without evidence of the
socket reaming or the screw bursting.
5. Materials and Manufacture
7.2 The hardness of 95 HRB (210 Vickers) maximum for
5.1 The screw may be forged, formed, extruded, machined,
condition A1-50 and 80 HRB (150 Vickers) minimum for
or ground to meet the dimensional characteristics and perfor-
condition A1-70 shall be met as determined using Test Meth-
mance requirements.
ods E18, E92, or Test Method E384 as appropriate.
5.2 Heat Treatment—Austenitic alloy Class A1-50 screws
8. Corrosion Resistance Requirements
shall be annealed by heating to 1040 6 30°C to obtain
8.1 Carbide Precipitation:
maximum corrosion resistance and minimum permeability.
8.1.1 Rod, bar, and wire in the austenitic alloys groups 1, 2,
The screws shall be held for a sufficient time at temperature,
3, except the free-machining grades, 303 and 303Se, used to
then cooled at a rate sufficient to prevent precipitation of the
make fasteners in accordance with this specification shall be
carbide and provide the properties in accordance with Table 1.
capable of passing the test for susceptibility to intergranular
5.3 When Condition A1–70 is specified, the austenitic
corrosion as specified in Practice E of Practices A262.
alloys shall be annealed as specified in 5.2, generally by the
8.1.2 AsstatedinPracticesA262,samplesmaybesubjected
raw material manufacturer, then cold worked to develop
to the faster and more severe screening test in accordance with
specific properties.
Practice A. Failing Practice A, specimens shall be tested to
PracticeEandbeconsideredsatisfactoryifpassingPracticeE.
6. Chemical Composition
6.1 The analysis of the screw material shall conform to the 9. Dimensions
chemical composition specified in Table 2.
9.1 Unlessotherwisespecified,theproductshallconformto
6.2 Unless otherwise specified in the inquiry and purchase the requirements of ASME B18.3.6M.
order(seeSupplementaryRequirementS2),thechoiceofalloy
10. Workmanship, Finish, and Appearance
used shall be that of the fastener manufacturer, as determined
by his fabrication methods and material availability. The 10.1 Surface Treatment—Unlessotherwisespecified,screws
specific alloy used by the manufacturer shall be clearly shall be cleaned, descaled, and passivated in accordance with
identifiedonallcertificationrequiredinthepurchaseorderand Practice A380 or Specification A967 at the option of the
shall have a chemical composition conforming to the limits manufacturer.
specified in Table 2.
10.2 Surface Discontinuities:
6.3 When chemical analysis is performed by the purchaser 10.2.1 The surface discontinuities for these products shall
using finished fasteners representing each lot, the chemical conform to Specification F788/F788M and the additional
contentsobtainedshallconformtothelimitsspecifiedinTable limitations specified herein.
2forthespecificalloy.Chemicalcompositionshallconformto 10.2.1.1 Processing cracks that connect the socket to the
the tolerances specified in Specification A555/A555M. periphery of the screw are not permissible. Defects originating
6.3.1 In the event of a discrepancy, a referee analysis of the on the periphery with a traverse indicating a potential to
samples for each lot as specified in 12.1, shall be made in intersectarenotpermissible.Forperipheraldiscontinuities,the
accordance with 11.3.1. maximum depth may be 0.06 D.
TABLE 1 Torsional Strength Requirements
Nominal Screw Size Shortest Nominal Screw Lengths Subject to Torque Testing for: Test Torque, N-m, min
Cup and Flat Points, Cone and Oval Points, Half Dog Points, mm A1-50 A1-70
mm mm
1.6 3 3 3 0.03 0.05
2444 0.06 0.1
2.5 4 4 4 0.18 0.3
3455 0.25 0.42
4566 0.8 1.4
5588 1.7 2.8
8 8 10 10 7 12
10 10 12 12 14 24
12 12 16 16 25 42
16 16 20 20 63 105
20 25 25 25 126 210
24 25 30 30 200 332
F880M−02 (2015)
TABLE 2 Chemical Requirements
Composition, % maximum except as shown
UNS
Alloy
Designation
Carbon Manganese Phosphorus Sulfur Silicon Chromium Nickel Copper Molybdenum Other
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 0.03 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 0.10 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.
11. Number of Tests inspection is required, but the screws shall be produced from
suitable raw material and manufactured by properly controlled
11.1 The requirements of this specification shall be met in
practices to maintain resistance to corrosion. When corrosion
co
...
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. 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: F880M − 02 (Reapproved 2008) F880M − 02 (Reapproved 2015)
Standard Specification for
Stainless Steel Socket Set Screws (Metric)
This standard is issued under the fixed designation F880M; 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
1.1 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.
1.2 Units—The values stated in SI units are to be regarded as standard. No other units of measurement are included in this
standard.
NOTE 1—This specification is the metric companion of Specification F880.
1.3 The following hazard caveat pertains only to Section 11, the Test Method Section:This standard does not purport to address
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:
A262 Practices for Detecting Susceptibility to Intergranular Attack in Austenitic Stainless Steels
A342/A342M Test Methods for Permeability of Weakly Magnetic Materials
A380 Practice for Cleaning, Descaling, and Passivation of Stainless Steel Parts, Equipment, and Systems
A555/A555M Specification for General Requirements for Stainless Steel Wire and Wire Rods
A751 Test Methods, Practices, and Terminology for Chemical Analysis of Steel Products
A967 Specification for Chemical Passivation Treatments for Stainless Steel Parts
D3951 Practice for Commercial Packaging
E3 Guide for Preparation of Metallographic Specimens
E18 Test Methods for Rockwell Hardness of Metallic Materials
E92 Test Method for Vickers Hardness of Metallic Materials (Withdrawn 2010)
E384 Test Method for Knoop and Vickers Hardness of Materials
F738M Specification for Stainless Steel Metric Bolts, Screws, and Studs (Withdrawn 2014)
F788/F788M Specification for Surface Discontinuities of Bolts, Screws, and Studs, Inch and Metric Series
F880 Specification for Stainless Steel Socket, Square Head, and Slotted Headless-Set Screws
F1470 Practice for Fastener Sampling for Specified Mechanical Properties and Performance Inspection
2.2 ASME Standard:
B 18.3.6M Metric Series Socket Set Screws R
3. Classification
3.1 The designation of the property class for the two materials and conditions of this specification shall be consistent with the
stainless steel designations in Specification F738M.
3.2 The austenitic stainless steel socket set screw shall be designation F880MA1–50 or F880M A1–70.
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 May 1, 2008Sept. 1, 2015. Published August 2008November 2015. Originally approved in 1984. Last previous edition approved in 20022008
as F880M – 02.M – 02(2008). DOI: 10.1520/F0880M-02R08.10.1520/F0880M-02R15.
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 the ASTM website.
The last approved version of this historical standard is referenced on www.astm.org.
Available from Global Engineering Documents, 15 Inverness Way, East Englewood, CO 80112-5704, http://www.global.ihs.com.
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959. United States
F880M − 02 (2015)
4. Ordering Information
4.1 Orders for material under this specification shall include the following information:
4.1.1 Quantity (number of screws);
4.1.2 Dimensions, including nominal thread designation, thread pitch, nominal screw length (millimetres) and point
configuration. A standard part number may be used for this definition;
4.1.3 Name of the screw (SSS);
4.1.4 Property Class A1-50 or A1-70;
4.1.5 Coating, if required. If a finish other than passivation is required, it must be specified on the order or product standard;
4.1.6 ASTM designation and year of issue; and
4.1.7 Any special or supplemental requirements.
4.2 Example—50 000 pieces M6 × 1 × 8 cone point SSS A1-70 ASTM F880M – 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 alloy Class A1-50 screws shall be annealed by heating to 1040 6 30°C 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 A1–70 is specified, the austenitic alloys shall be annealed as specified in 5.2, generally by the raw material
manufacturer, 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
shall be that of the fastener manufacturer, as determined by his fabrication methods and material availability. The specific alloy
used 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
obtained shall conform to the limits specified in Table 2 for the specific alloy. Chemical composition shall conform to the tolerances
specified in Specification A555/A555M.
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.
7. Mechanical Properties
7.1 Socket set screws, when subjected to a torque test in accordance with 12.2.1, shall withstand application of the test
tightening torque specified in Table 2 without evidence of the socket reaming or the screw bursting.
7.2 The hardness of 95 HRB (210 Vickers) maximum for condition A1-50 and 80 HRB (150 Vickers) minimum for condition
A1-70 shall be met as determined using Test Methods E18, E92, or Test Method E384 as appropriate.
TABLE 1 Torsional Strength Requirements
Nominal Screw Size Shortest Nominal Screw Lengths Subject to Torque Testing for: Test Torque, N-m, min
Cup and Flat Points, Cone and Oval Points, Half Dog Points, mm A1-50 A1-70
mm mm
1.6 3 3 3 0.03 0.05
2 4 4 4 0.06 0.1
2.5 4 4 4 0.18 0.3
3 4 5 5 0.25 0.42
4 5 6 6 0.8 1.4
5 5 8 8 1.7 2.8
6 6 8 8 3 5
8 8 10 10 7 12
10 10 12 12 14 24
12 12 16 16 25 42
16 16 20 20 63 105
20 25 25 25 126 210
24 25 30 30 200 332
F880M − 02 (2015)
TABLE 2 Chemical Requirements
Composition, % maximum except as shown
UNS
Alloy
Designation
Carbon Manganese Phosphorus Sulfur Silicon Chromium Nickel Copper Molybdenum Other
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 0.03 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 0.10 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.
8. Corrosion Resistance Requirements
8.1 Carbide Precipitation:
8.1.1 Rod, bar, and wire in the austenitic alloys groups 1, 2, 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 A262.
8.1.2 As stated in Practices A262, 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 18.3.6M.
10. Workmanship, Finish, and Appearance
10.1 Surface Treatment—Unless otherwise specified, screws shall be cleaned, descaled, and passivated in accordance with
Practice A380 or Specification A967 at the option of the manufacturer.
10.2 Surface Discontinuities:
10.2.1 The surface discontinuities for these products shall conform to Specification F788/F788M and the additional limitations
specified herein.
10.2.1.1 Processing cracks that connect the socket to the periphery of the screw are not permissible. Defects originating on the
periphery with a traverse indicating a potential to intersect are not permissible. For peripheral discontinuities, the maximum depth
may be 0.06 D.
11. Number of Tests
11.1 The requirements of this specification shall be met in continuous mass production for stock and the manufact
...
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