ASTM_F_2246_-_06_2013.pdf

Designation:F224606(Reapproved 2013)Standard Specification forBearing,Roller,Needle:Thick Outer Ring With Rollers andCage1This standard is issued under the fixed designation F2246;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.Scope1.1 This specification covers needle roller bearings havingthick outer rings,with rollers and cages.1.2 The bearings being specified are intended to be usedwith hardened shafts(HRC58-65;see Test Methods E18).Foruse with unhardened shafts,bearings should be used inconjunction with inner bearing ring MS51962 as specified inSpecification F2431 and shown as MS500072 bearing assem-blies in Specification F2430.1.3 The use of recycled materials that meet the requirementsof the applicable material specification without jeopardizingthe intended use of the item is encouraged.1.4 Bearings designed to this specification are intended foruse in applications requiring high radial load with minimalangular shaft misalignment.1.5 The values stated in inch-pound units are to be regardedas standard.The values given in parentheses are mathematicalconversions to SI units that are provided for information onlyand are not considered standard.NOTE1This specification contains many of the requirements ofMS51961 which was originally developed by the Department of Defenseand maintained by the Defense Supply Center Richmond.2.Referenced Documents2.1 ASTM Standards:2E18 Test Methods for Rockwell Hardness of Metallic Ma-terialsF2430 Specification for Bearing,Roller,Needle:Assembly(Thick Outer Race)F2431 Specification for Ring Bearing,Inner:For NeedleRoller Bearing with Thick Outer Ring2.2 ANSI Standard:3ANSI B46.1 Surface Texture(Surface Roughness,Waviness,and Lay)2.3 SAE Standards:4SAE J-404 Chemical Compositions of SAE Alloy SteelsSAE AMS-STD-66 Steel:Chemical Composition and Hard-enability2.4 Military Standards:5MIL-STD-130 Identification Marking of U.S.Military Prop-ertyMS500072 Bearing,Roller,Needle:Assembly(Thick OuterRace)MS51962 Ring Bearing,Inner:For Needle Roller Bearingwith Thick Outer Ring2.5 American Bearing Manufacturers Association Stan-dard:6ABMA 18.1 Needle Roller Bearings Radial,Inch Design2.6 International Organization for Standardization Stan-dards:7ISO 492 Rolling BearingsRadial BearingsTolerancesISO 3096 Rolling BearingsNeedle RollersDimensionsand TolerancesISO 5593 Rolling BearingsVocabulary3.Terminology3.1 DefinitionsFor definitions of terms used in thisspecification,refer to ISO 5593,Rolling BearingsVocabulary.3.2 Definitions of Terms Specific to This Standard:1This specification is under the jurisdiction ofASTM Committee F34 on RollingElement Bearings and is the direct responsibility of Subcommittee F34.04 onAutomotive/Industrial Bearing.Current edition approved May 1,2013.Published May 2013.Originallyapproved in 2003.Last previous edition approved in 2007 as F2246 061.DOI:10.1520/F2246-06R13.2For 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.3Available from American National Standards Institute(ANSI),25 W.43rd St.,4th Floor,New York,NY 10036.4Available from Society of Automotive Engineers(SAE),400 CommonwealthDr.,Warrendale,PA 15096-0001.5AvailableontheDoDsASSISTinternetsitelocatedat:http:/assist.daps.dla.mil/online/start/.6Available from Techstreet,1327 Jones Drive,Ann Arbor,MI 48105.7Available from ANSI Washington,D.C.Headquarters,1819 L Street,NW,6thFloor,Washington,DC,20036Copyright ASTM International,100 Barr Harbor Drive,PO Box C700,West Conshohocken,PA 19428-2959.United States1 3.2.1 average life(L50)for a radial roller bearing,thenumber of revolutions that 50%of a group of bearings willcomplete or exceed before the first evidence of fatigue devel-ops.3.2.1.1 DiscussionThe average life is approximately fivetimes the rating life.3.2.2 basic dynamic load rating(Cr)for a radial rollerbearing,that calculated,constant radial load that a group ofapparently identical bearings with stationary outer rings cantheoretically endure for a rating life of one million revolutionsof the inner ring.3.2.2.1 DiscussionSince applied loading as great as thebasic dynamic load rating tends to cause local plastic defor-mation of the rolling surfaces,it is not anticipated that suchheavy loading would normally be applied.3.2.3 basic static load rating(Cor)for a radial rollerbearing,that uniformly distributed static radial load whichproduces a maximum contact stress at the center of the mostheavily loaded rolling element contact of 580 000 psi(4000Mpa).3.2.3.1 DiscussionFor this contact stress,a tot