ASTM F880M-02(2008)

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 880M–01a Designation: F 880M – 02 (Reapproved 2008)
Standard Specification for
Stainless Steel Socket Set Screws [Metric](Metric)
This standard is issued under the fixed designation F 880M; 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 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 F 880.
1.2
1.3 ThefollowinghazardcaveatpertainsonlytoSection11,theTestMethodSection: 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:
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 Passiviation of Stainless Steel Parts, Equipment, and Systems
A 555/A 555M Specification for General Requirements for Stainless 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
E3Method of Preparation of Metallographic Specimens 3 Guide for Preparation of Metallographic Specimens
E 18Test Methods for Rockwell Hardness and Rockwell Superficial Hardness of Metallic Materials Test Methods for
Rockwell Hardness of Metallic Materials
E 92Test Method for Vickers Hardness Metallic Materials
E353Test Methods for Chemical Analysis of Stainless, Heat-Resisting, Maraging, and Other Similar Chromium-Nickel-Iron
Alloys Test Method for Vickers Hardness of Metallic Materials
E 384 Test Method for Microindentation Hardness of Materials
F 738M Specification for Stainless Steel Metric Bolts, Screws, and Studs
F 788/F 788M Specification for Surface Discontinuities of Bolts, Screws, and Studs, Inch and Metric Series
F 880 Specification for Stainless Steel Socket-Set Screws
F 1470 Guide 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
This specification is under the jurisdiction of ASTM Committee F16 on Fasteners and is the direct responsibility of Subcommittee F16.04 on Nonferrous Fastners.
Current edition approved Oct. 10, 2001. Published November 2001. Originally published as F880M–84. Last previous edition F880M–98.
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, 2008. Published August 2008. Originally approved in 1984. Last previous edition approved in 2002 as F 880M – 02.
For referencedASTM standards, visit theASTM website, www.astm.org, or contactASTM Customer Service at service@astm.org. For Annual Book of ASTM Standards
, Vol 01.03.volume information, refer to the standard’s Document Summary page on the ASTM website.
Annual Book of ASTM Standards, Vol 03.04.
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.
F 880M – 02 (2008)
stainless steel designations in Specification F 738M.
3.2 The austenitic stainless steel socket set screw shall be designation F 880M A1–50 or F 880M A1–70.
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 (millimetres) 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 Property Class A1-50 or A1-70,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,standard;
4.1.6 ASTM designation and year of issue,issue; and
4.1.7 Any special or supplemental requirements.
4.2 Example—50 000 pieces M6 3 1 3 8 cone point SSS A1-70 ASTM F 880M – 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 ConditionA1–70 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
obtainedshallconformtothelimitsspecifiedinTable2forthespecificalloy.Chemicalcompositionshallconformtothetolerances
specified in Specification A 555/A 555M.
6.3.1 Intheeventofadiscrepancy,arefereeanalysisofthesamplesforeachlotasspecifiedin12.1,shallbemadeinaccordance
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.
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
F 880M – 02 (2008)
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
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 .
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 0.03 2.00 0.045 0.030 1.00 17.0 to 19.0 8.0 to 10.0 3.0to4.0 . .
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.
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 E 18, E 92, or Test Method E 384 as appropriate.
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 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 18.3.6M.
10. Workmanship, Finish, and Appearance
10.1 Surface Treatment—Unless otherwise specified, screws shall be cleaned, descaled, and passivated in accordance with
Practice A 380 or Specification A 967 at the option of the manufacture
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