ASTM_B_438_-_17.pdf

Designation:B43817Standard Specification forBronze-Base Powder Metallurgy(PM)Bearings(Oil-Impregnated)1This standard is issued under the fixed designation B438;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.This standard has been approved for use by agencies of the U.S.Department of Defense.1.Scope*1.1 This specification covers porous metallic sleeve,flange,thrust and spherical bronze-base bearings that are producedfrom mixed metal powders utilizing powder metallurgy(PM)technology and then impregnated with oil to supply operatinglubrication.1.2 Included are the specifications for the chemical,physi-cal and mechanical requirements of those bronze-base PMmaterials that have been developed and standardized specifi-cally for use in the manufacture of these self-lubricatingbearings.1.3 This specification is applicable to the purchase ofbronze-base bearings(oil-impregnated)that were formerlycovered by military specifications and are intended for govern-ment or military applications.Those additional governmentrequirements that only apply to military bearings are listed inthe Supplementary Requirements section of this specification.1.4 This specification accompanies Specification B439 thatcovers the requirements for Iron-Base Powder Metallurgy(PM)Bearings,(Oil-Impregnated).1.5 Typical applications for bronze-base bearings are listedin Appendix X1.1.6 Bearing dimensional tolerance data are shown in Ap-pendix X2,while engineering information regarding installa-tion and operating parameters of PM bearings is included inAppendix X3.Additional useful information on self-lubricating bearings can be found in MPIF Standard 35,ISO5755 and the technical literature.21.7 With the exception of density values for which theg/cm3unit is the industry standard,the values stated ininch-pound units are to be regarded as standard.The valuesgiven in parentheses are mathematical conversions to SI unitsthat are provided for information only and are not consideredstandard.1.8 The following safety hazards caveat pertains only to thetest methods described in this specification.This standard doesnot purport to address all of the safety concerns,if any,associated with its use.It is the responsibility of the user of thisstandard to establish appropriate safety and health practicesand determine the applicability of regulatory limitations priorto use.1.9 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:3B243 Terminology of Powder MetallurgyB439 Specification for Iron-Base Powder Metallurgy(PM)Bearings(Oil-Impregnated)B939 Test Method for Radial Crushing Strength,K,ofPowder Metallurgy(PM)Bearings and Structural Materi-alsB946 Test Method for Surface Finish of Powder Metallurgy(PM)ProductsB962 Test Methods for Density of Compacted or SinteredPowder Metallurgy(PM)Products Using ArchimedesPrincipleB963 Test Methods for Oil Content,Oil-ImpregnationEfficiency,and Surface-Connected Porosity of SinteredPowder Metallurgy(PM)Products Using ArchimedesPrincipleE9 Test Methods of Compression Testing of Metallic Mate-rials at Room Temperature1This specification is under the jurisdiction of ASTM Committee B09 on MetalPowders and Metal Powder Products and is the direct responsibility of Subcom-mittee B09.04 on Bearings.Current edition approved April 1,2017.Published April 2017.Originallyapproved in 1966.Last previous edition approved in 2013 as B438 13.DOI:10.1520/B0438-17.2Machine Design Magazine,Vol 54,#14,June 17,1982,pp.130-142.3For 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.*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 International Standards,Guides and Recommendations issued by the World Trade Organization Technical Barriers to Trade(TBT)Committee.1 E29 Practice for Using Significant Digits in Test Data toDetermine Conformance with SpecificationsE1019 Test Methods for Determination of Carbon,Sulfur,Nitrogen,and Oxygen in Steel,Iron,Nickel,and CobaltAlloys by Various Combustion and Fusion Techniques2.2 MPIF Standard:MPIF Standar