Designation:D5183−21aStandardTestMethodforDeterminationoftheCoefficientofFrictionofLubricantsUsingtheFour-BallWearTestMachine1ThisstandardisissuedunderthefixeddesignationD5183;thenumberimmediatelyfollowingthedesignationindicatestheyearoforiginaladoptionor,inthecaseofrevision,theyearoflastrevision.Anumberinparenthesesindicatestheyearoflastreapproval.Asuperscriptepsilon(´)indicatesaneditorialchangesincethelastrevisionorreapproval.1.Scope*1.1ThistestmethodcoversaprocedurefordeterminingthecoefficientoffrictionbymeansoftheFour-BallWearTestMachine.21.2ThevaluesstatedineitherSIunitsorintheformercm-kgfmetricunitsaretoberegardedseparatelyasthestandard.Withinthetextthecm-kgfunitsareshowninparentheses.Thevaluesstatedineachsystemarenotexactequivalents,thereforeeachsystemmustbeusedindependentlyoftheother.Combiningvaluesfromthetwosystemscanresultinnonconformancetospecification.1.3Thisstandarddoesnotpurporttoaddressallofthesafetyconcerns,ifany,associatedwithitsuse.Itistheresponsibilityoftheuserofthisstandardtoestablishappro-priatesafety,health,andenvironmentalpracticesanddeter-minetheapplicabilityofregulatorylimitationspriortouse.Specificwarningstatementsaregivenin7.3and7.4.1.4Thisinternationalstandardwasdevelopedinaccor-dancewithinternationallyrecognizedprinciplesonstandard-izationestablishedintheDecisiononPrinciplesfortheDevelopmentofInternationalStandards,GuidesandRecom-mendationsissuedbytheWorldTradeOrganizationTechnicalBarrierstoTrade(TBT)Committee.2.ReferencedDocuments2.1ASTMStandards:3D4172TestMethodforWearPreventiveCharacteristicsofLubricatingFluid(Four-BallMethod)2.2ANSI/ABMA/ISOStandard:43290-1-2014RollingBearings–Balls–Part1:SteelBalls3.Terminology3.1Definitions:3.1.1coeffıcientoffriction,(µ),n—theratioofthetangentialforcethatisneededtostartortomaintainuniformrelativemotionbetweentwocontactingsurfacestotheperpendicularforceholdingthemincontact.4.SummaryofTestMethod4.1Three12.7mm(0.5in.)diametersteelballsareclampedtogetherandcoveredwith10mLofthewear-inlubricant...
