ABMA 21.2:1988(S2010) pdf free

ABMA 21.2:1988(S2010) pdf free.Thrust Needle Roller and Cage Assemblies and Thrust Washers – Inch Design
All thrust needle roller and cage assemblies and thrust washers listed in this standard are not necessarily available. For availability, consult bearing manufacturers. Other applicable standards should be consulted for tolerance definitions, gaging practices and methods of evaluating load ratings.
This standard only covers external dimensions. Functional interchangeability between different makes of standard thrust needle roller and cage assemblies and thrust washers of the same size may depend on bearing features which are not standardized. Hence, the substitution of one make of a standard bearing for another should only be made after careful comparison of their characteristics and consideration of the requirements of the particular application.
This code identifies and, as far as possible, describes each thrust needle roller and cage assembly or thrust washer on the basis of complete dimensional interchangeability. This code establishes a universal language for describing and identifying inch design thrust needle roller and cage assemblies and thrust washers in order to facilitate communication between the user and the manufacturer. The code is also intended to simplifty the handling by user personnel of identical bearings made by different manufacturers, whose identification numbers may be different.
This code applies only to those inch design thrust needle roller and cage assemblies and thrust washers whose boundary dimensions and tolerances conform to this standard.
As shown in the following table, Schematic Arrangement of a Complete Code Number,the code consists of one or two sections.
Purpose of Plans. The boundary plans shown in the Boundary Tables 1 and 2 are designed to reduce, as much as possible, the number of thrust needle roller and cage assemblies and thrust washers to promote economic production and yet to provide a sufficient number of sizes and proportions to satisfy present and future needs of bearing users.
Tolerance definitions and gaging practice. Definitions of terms used in the tolerance tables, as well as most gaging practices are covered in ANSI/ABMA Standard 4.ABMA 21.2 pdf free download.