ASTM_F_2591_-_06_2013.pdf

Designation:F259106(Reapproved 2013)Standard Specification forBearing,Roller,Tapered,Single Row of Rollers(MetricSeries)1This standard is issued under the fixed designation F2591;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 requirements for metric series,tapered roller bearings with a single row of rollers.1.2 Intended UseThe bearings covered in this specifica-tion are intended to be used in general industrial and vehicleapplications where the operating temperature does not exceed120C(250F).1.3 This specification contains many of the requirements ofDS3225,which was originally developed by the Department ofDefense and maintained by the Defense Supply Center inRichmond.The following government activity codes may befound in the Department of Defense,Standardization DirectorySD-1.2Preparing ActivityCustodiansReview ActivitiesDLA-GS4Army-ATArmy-AVNavy-MCNavy MC,SHAir Force-99Air Force-84Other-NS1.4 The values stated in SI units are to be regarded asstandard.No other units of measurement are included in thisstandard.1.5 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 and health practices and determine the applica-bility of regulatory limitations prior to use.2.Referenced Documents2.1 ABMA Standard:3ABMA 19.1 Tapered Roller BearingsRadial,Metric De-sign2.2 ISO Standard:4ISO 5593 Rolling BearingsVocabulary2.3 Military Standard:5MIL-C-11796 CorrosionPreventativeCompound,Petrolatum,Hot Application2.4 SAE Standard:6SAE AMS-STD-66 Steel:Chemical Composition and Hard-enability3.Terminology3.1 Definitions:3.1.1 For definitions of terms used in this specification referto ISO 5593.3.1.2 effective load centerdimension(a)locates a point onthe inner ring(cone)axis that is the center of pressure of allresisting forces set up by the bearing rollers.All momentsshould be calculated from this point when determining bearingloading and shaft stresses.A minus value of(a)indicates thatthe center is inside the inner ring(cone)backface.3.1.3 K factorthe K Factor is the ratio of the basic radialdynamic load rating to the basic static load rating.3.1.4 contact anglethese bearing have a contact angle()between 10 and 19 degrees.The contact angle is the anglebetween the line of action of the roller load and a planeperpendicular to the bearing axis.4.Ordering Information4.1 Procurement documents should specify the following:4.1.1 Title,number,and date of this specification,4.1.2 Part Number(see 8.1),4.1.3 Nominal dimensions of bearing(bore,outsidediameter,bearing width),4.1.4 Quantity required,4.1.5 Inspection records required,and1This 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 October 2013.Originallypublished in 2006.Last previous edition approved as F2591 06.DOI:10.1520/F2591-06R13.2The Military codes that are listed in SD-1 give the address and phone numbersof the DoD contacts.These are found in the DoDs ASSIST website http:/assist.daps.dla.mil/online/start/.3Available from Techstreet,777 E.Eisenhower Parkway,AnnArbor,MI 48108.4Available from American National Standards Institute(ANSI),25 W.43rd St.,4th Floor,New York,NY 10036.5AvailablefromtheDODs Assistinternetsitelocatedat:http:/assist.daps.dla.mil/online/start/.6Available from Society of Automotive Engineers(SAE),400 CommonwealthDr.,Warrendale,PA 15096-0001.Copyright ASTM International,100 Barr Harbor Drive,PO Box C700,West Conshohocken,PA 19428-2959.United States1 4.1.6 Required packaging.5.Materials and Manufacture5.1 Material:5.1.1 Outer Ring(Cup),Inner Ring(Cone)and RollersBearing quality,carburizing grade alloy or through-hardening grade alloy steel in accordance with SAE AMS-STD-66.5.1.2 CageCarbon steel(stamped)or powdered processsteel(for example,Sinta Forge)may be used.6.Physical Properties6.1 HardnessOuter ring(cup),inner ring(cone)androllers shall be hardened to 58 to 64 HRC.7.Dimensions,Mass,and Permissible Variations7.1 Dimensions:7.1.1 Dimensions Db,Da,db,daare recommended shaft andhousing shoulder diameters.7.1.2 Dimensions R and r are the maximum fillet radii onthe shaft and the housing respectively,which will be cleared bythe bearing corner.See Fig.1 and Table 1.7.2 TolerancesPrecision grade(Class B)shall be specifiedonly when technically justified.7.2.1 Standard Grade(Class K)See Tables 2-5.7.2.2 Precision Grade(Class B)See Tables 6-9.7.3 Cage Clearance Designers should provide a clearanceof 3.2