ASTM D7421-19

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of the standard as published by ASTM is to be considered the official document.
Designation: D7421 − 16 D7421 − 19
Standard Test Method for
Determining Extreme Pressure Properties of Lubricating
Oils Using High-Frequency, Linear-Oscillation (SRV) Test
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Machine
This standard is issued under the fixed designation D7421; 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.
1. Scope*
1.1 This test method covers a procedure for determining extreme pressure properties of lubricating oils for hydraulics, gears,
and engines under high-frequency linear-oscillation motion using the SRV test machine.
NOTE 1—This test method was developed and the international round robin tests were jointly performed with the DIN 51834 working group. This
procedure is based on the 2005 revision of Test Method D5706 for greases and differs regarding the stroke length and the cleaning solvent.
1.2 The values stated in SI units are to be regarded as standard. No other units of measurement are included in this standard.
1.3 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 safety, health, and healthenvironmental 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.
2. Referenced Documents
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2.1 ASTM Standards:
A295/A295M Specification for High-Carbon Anti-Friction Bearing Steel
D217 Test Methods for Cone Penetration of Lubricating Grease
D235 Specification for Mineral Spirits (Petroleum Spirits) (Hydrocarbon Dry Cleaning Solvent)
D4175 Terminology Relating to Petroleum Products, Liquid Fuels, and Lubricants
D5706 Test Method for Determining Extreme Pressure Properties of Lubricating Greases Using a High-Frequency, Linear-
Oscillation (SRV) Test Machine
E45 Test Methods for Determining the Inclusion Content of Steel
G40 Terminology Relating to Wear and Erosion
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2.2 DIN Standards:
DIN 51631:1999–04 Mineral spirits; special boiling point spirits; requirements
DIN EN ISO 683-17 Heat-treated Steels, alloy steels and free-cutting steels—Part 17 : Ball and roller bearing steels [Replaces
DIN 17230-1980]
DIN EN ISO 13565-2:1998 Geometrical Product Specifications (GPS)—Surface texture: Profile method; Surfaces having
stratified functional properties—Part 2: Height characterization using linear material ratio curve [Replacement of DIN
4776:1990: Measurement of surface roughness; parameters R , R , R , M , M for the description of the material portion]
K PK VK r1 r2
3. Terminology
3.1 Definitions:
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This test method is under the jurisdiction of ASTM Committee D02 on Petroleum Products, Liquid Fuels, and Lubricants and is the direct responsibility of Subcommittee
D02.L0.11 on Tribological Properties of Industrial Fluids and Lubricates.
Current edition approved Oct. 1, 2016Dec. 1, 2019. Published February 2017January 2020. Originally approved in 2008. Last previous edition approved in 20112016 as
D7421 – 11.D7421 – 16. DOI: 10.1520/D7421-16.10.1520/D7421-19.
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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.
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Available from Beuth Verlag GmbH (DIN, Deutsches Institut fur Normung e.V.), Burggrafenstrasse 6, 10787, Berlin, Germany, http://www.en.din.de.
*A Summary of Changes section appears at the end of this standard
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D7421 − 19
3.1.1 break-in, n—in tribology, an initial transition process occurring in newly established wearing contacts, often accompanied
by transients in coefficient of friction or wear rate, or both, which are uncharacteristic of the given tribological system’s long-term
behavior. G40
3.1.2 coeffıcient of friction, μ or f,n—in tribology, the dimensionless ratio of the friction force (F) between tw
...