ASTM D7420-23
(Test Method)Standard Test Method for Determining Tribomechanical Properties of Grease Lubricated Plastic Socket Suspension Joints Using a High-Frequency, Linear-Oscillation (SRV) Test Machine
Standard Test Method for Determining Tribomechanical Properties of Grease Lubricated Plastic Socket Suspension Joints Using a High-Frequency, Linear-Oscillation (SRV) Test Machine
SIGNIFICANCE AND USE
5.1 This test method can be used to quickly determine the lubricating ability of greases lubricating automotive plastic socket suspension joints. This test method has found wide application in qualifying greases used in chassis systems. This test method is a material and application oriented approach based on inputs from field experiences for characterizing the tribological behavior (friction and wear) using random, discrete, and constant parameter combinations. Users of this test method should determine whether results correlate with field performance or other applications prior to commercialization.
SCOPE
1.1 This test method covers a procedure for determining the friction and wear behavior of grease lubricated plastic socket suspension joints, for validation of suspension joint greases and quality inspection for those greases under high-frequency linear-oscillation motion using the SRV test machine.
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, 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
Buy Standard
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: D7420 − 23
Standard Test Method for
Determining Tribomechanical Properties of Grease
Lubricated Plastic Socket Suspension Joints Using a High-
1
Frequency, Linear-Oscillation (SRV) Test Machine
This standard is issued under the fixed designation D7420; 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.
INTRODUCTION
This test method was originally published as bilingual company standard TRW 62 051 301 in June
2
2002. TRW Fahrwerksysteme transferred the copyright on Oct. 5, 2004 to standardization bodies. The
DIN 51834 working group has modified this standard by adding precision information based on round
robin tests.
1. Scope* A295 Specification for High-Carbon Anti-Friction Bearing
Steel
1.1 This test method covers a procedure for determining the
D217 Test Methods for Cone Penetration of Lubricating
friction and wear behavior of grease lubricated plastic socket
Grease
suspension joints, for validation of suspension joint greases
D4175 Terminology Relating to Petroleum Products, Liquid
and quality inspection for those greases under high-frequency
Fuels, and Lubricants
linear-oscillation motion using the SRV test machine.
D5706 Test Method for Determining Extreme Pressure
1.2 The values stated in SI units are to be regarded as
Properties of Lubricating Greases Using a High-
standard. No other units of measurement are included in this
Frequency, Linear-Oscillation (SRV) Test Machine
standard.
E45 Test Methods for Determining the Inclusion Content of
1.3 This standard does not purport to address all of the Steel
safety concerns, if any, associated with its use. It is the
G40 Terminology Relating to Wear and Erosion
4
responsibility of the user of this standard to establish appro- 2.2 DIN Standards:
priate safety, health, and environmental practices and deter-
DIN EN ISO 683-17 Heat-treated steels, alloy steels and
mine the applicability of regulatory limitations prior to use. free-cutting steels—Part 17: Ball and roller bearing steels
1.4 This international standard was developed in accor-
(replaces DIN 17230-1980)
dance with internationally recognized principles on standard- DIN EN ISO 13565-2: 1998 Geometrical Product Specifica-
ization established in the Decision on Principles for the
tions (GPS)—Surface texture: Profile method—Surfaces
Development of International Standards, Guides and Recom- having stratified functional properties—Part 2: Height
mendations issued by the World Trade Organization Technical
characterization using the linear material ratio curve
Barriers to Trade (TBT) Committee. DIN EN 17022–4: 1998 Heat treatment of ferrous
materials—Methods of heat treatment—Part 4: Nitriding
2. Referenced Documents
and nitrocarburizing (available in English)
3
2.1 ASTM Standards:
3. Terminology
3.1 Definitions:
1
This test method is under the jurisdiction of ASTM Committee D02 on
3.1.1 For definitions of terms used in this test method, refer
Petroleum Products, Liquid Fuels, and Lubricants and is the direct responsibility of
to Terminology D4175.
Subcommittee D02.G0 on Lubricating Grease.
3.1.2 break-in, n—in tribology, an initial transition process
Current edition approved Nov. 1, 2023. Published December 2023. Originally
approved in 2010. Last previous edition approved in 2018 as D7420 – 18.
occurring in newly established wearing contacts, often accom-
DOI:10.1520/D7420-23.
panied by transients in coefficient of friction or wear rate, or
2
TRW Fahrwerksysteme (Chassis Systems), D-50543, Düsseldorf, Germany.
3
For referenced ASTM standards, visit the ASTM website, www.astm.org, or
4
contact ASTM Customer Service at service@astm.org. For Annual Book of ASTM Available from Beuth Verlag GmbH (DIN-- DIN Deutsches Institut fur
Standards volume information, refer to the standard’s Document Summary page on Normung e.V.), Burggrafenstrasse 6, 10787, Berlin, Germany, http://www.en.din.de.
the ASTM website.
*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
1
---------------------- Page: 1 ----------------------
D7420 − 23
both, which are uncharacteristic of the given tribological by a sharp rise in the coefficient of friction, over steady state,
system’s long-term behavior. G40 of greater than 0.2 for over 20 s. In severe cases, a stoppage in
the motor will occur (for example, see Test Method D5706).
3.1.3 coeffıcie
...
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: D7420 − 18 D7420 − 23
Standard Test Method for
Determining Tribomechanical Properties of Grease
Lubricated Plastic Socket Suspension Joints Using a High-
1
Frequency, Linear-Oscillation (SRV) Test Machine
This standard is issued under the fixed designation D7420; 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.
INTRODUCTION
This test method was originally published as bilingual company standard TRW 62 051 301 in June
2
2002. TRW Fahrwerksysteme transferred the copyright on Oct. 5, 2004 to standardization bodies. The
DIN 51834 working group has modified this standard by adding precision information based on round
robin tests.
1. Scope*
1.1 This test method covers a procedure for determining the friction and wear behavior of grease lubricated plastic socket
suspension joints, for validation of suspension joint greases and quality inspection for those greases under high-frequency
linear-oscillation motion using the SRV test machine.
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, 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.
2. Referenced Documents
3
2.1 ASTM Standards:
A295 Specification for High-Carbon Anti-Friction Bearing Steel
D217 Test Methods for Cone Penetration of Lubricating Grease
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
1
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.G0 on Lubricating Grease.
Current edition approved Dec. 1, 2018Nov. 1, 2023. Published January 2019December 2023. Originally approved in 2010. Last previous edition approved in 20172018
as D7420 – 17.D7420 – 18. DOI:10.1520/D7420–17.DOI:10.1520/D7420-23.
2
TRW Fahrwerksysteme (Chassis Systems), D-50543, Düsseldorf, Germany.
3
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.
*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
1
---------------------- Page: 1 ----------------------
D7420 − 23
E45 Test Methods for Determining the Inclusion Content of Steel
G40 Terminology Relating to Wear and Erosion
4
2.2 DIN Standards:
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 the linear material ratio curve
DIN EN 17022–4: 1998 Heat treatment of ferrous materials—Methods of heat treatment—Part 4: Nitriding and nitrocarburizing
(available in English)
3. Terminology
3.1 Definitions:
3.1.1 For definitions of terms used in this test method, refer to Terminology D4175.
3.1.2 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
3.1.3 coeffıcient of friction, μ or ƒ, n—in tribology, the dimensionless ratio of the friction force (F) between two bodies to the
normal force (N) pressing these bodies together.
...
Questions, Comments and Discussion
Ask us and Technical Secretary will try to provide an answer. You can facilitate discussion about the standard in here.