ASTM_D_5183_-_21a.pdf

Designation:D518321aStandard Test Method forDetermination of the Coefficient of Friction of LubricantsUsing the Four-Ball Wear Test Machine1This standard is issued under the fixed designation D5183;the number immediately following the designation indicates the year oforiginal adoption or,in the case of revision,the year of last revision.A number in parentheses indicates the year of last reapproval.Asuperscript epsilon()indicates an editorial change since the last revision or reapproval.1.Scope*1.1 This test method covers a procedure for determining thecoefficient of friction by means of the Four-Ball Wear TestMachine.21.2 The values stated in either SI units or in the formercm-kgf metric units are to be regarded separately as thestandard.Within the text the cm-kgf units are shown inparentheses.The values stated in each system are not exactequivalents,therefore each system must be used independentlyof the other.Combining values from the two systems can resultin nonconformance to specification.1.3 This standard does not purport to address all of thesafety concerns,if any,associated with its use.It is theresponsibility of the user of this standard to establish appro-priate safety,health,and environmental practices and deter-mine the applicability of regulatory limitations prior to use.Specific warning statements are given in 7.3 and 7.4.1.4 This international standard was developed in accor-dance with internationally recognized principles on standard-ization established in the Decision on Principles for theDevelopment of International Standards,Guides and Recom-mendations issued by the World Trade Organization TechnicalBarriers to Trade(TBT)Committee.2.Referenced Documents2.1 ASTM Standards:3D4172 Test Method for Wear Preventive Characteristics ofLubricating Fluid(Four-Ball Method)2.2 ANSI/ABMA/ISO Standard:43290-1-2014 Rolling Bearings Balls Part 1:Steel Balls3.Terminology3.1 Definitions:3.1.1 coeffcient of friction,(),nthe ratio of the tangentialforce that is needed to start or to maintain uniform relativemotion between two contacting surfaces to the perpendicularforce holding them in contact.4.Summary of Test Method4.1 Three 12.7 mm(0.5 in.)diameter steel balls are clampedtogether and covered with 10 mL of the wear-in lubricant.Afourth 12.7 mm diameter ball,referred to as the“top ball”ispressed with a force of 392 N(40 kgf)into the cavity formedby the three clamped balls for three-point contact.The tem-perature of the wear-in lubricant is regulated at 75 C(167 F),and then,the top ball is rotated at 600 r min for 60 min.4.2 Fluid is discarded and balls cleaned.The wear scardiameter on each of the lower three balls is examined.If thewear scars average 0.67 mm 6 0.03 mm,(0.026 in.60.001 in.)then the 10 mL of test fluid is added to the ball cupwith the worn-in test balls in place.The temperature of the testlubricant is regulated at 75 C(167 F)and the top ball isrotated at 600 r min at 98.1 N(10 kgf)for 10 min.4.3 The load is then increased by 98.1 N(10 kgf)at the endof each successive 10 min interval up to the point where thefrictional trace indicates incipient seizure.The coefficient offriction is measured at the end of each 10 min interval.5.Significance and Use5.1 This test method can be used to determine the coefficientof friction of lubricating fluids under the prescribed testconditions.The user of this test method should determine to hisown satisfaction whether results of this test method correlatewith field performance or other bench test machines.1This test method is under the jurisdiction of ASTM Committee D02 onPetroleum Products,Liquid Fuels,and Lubricants and is the direct responsibility ofSubcommittee D02.L0.11 on Tribological Properties of Industrial Fluids andLubricates.Current edition approved Nov.1,2021.Published January 2022.Originallyapproved in 1991.Last previous edition approved in 2021 as D5183 21.DOI:10.1520/D5183-21A.2The sole source of supply of the Four-Ball Wear Test Machine known to thecommittee at this time is Falex Corp.,1020 Airpark Dr.,Sugar Grove,IL 60554.Ifyou are aware of alternative suppliers,please provide this information to ASTMInternational Headquarters.Your comments will receive careful consideration at ameeting of the responsible technical committee,1which you may attend.3For referenced ASTM standards,visit the ASTM website,www.astm.org,orcontact ASTM Customer Service at serviceastm.org.For Annual Book of ASTMStandards volume information,refer to the standards Document Summary page onthe ASTM website.4Available from American National Standards Institute(ANSI),25 W.43rd St.,4th Floor,New York,NY 10036,http:/www.ansi.org.*A Summary of Changes section appears at the end of this standardCopyright ASTM International,100 Barr Harbor Drive,PO Box C700,West Conshohocken,PA 19428-2959.United StatesThis international standard was developed in accordance with internationally recognized principles on standardization established in the Decision on Principles for theDevelopment of In