ABMA 24.1:1989(S2010) pdf download.Thrust Bearings of Ball, Cylindrical Roller & Spherical Roller Types—Metric Design
1. SCOPE
This standard for thrust bearings of ball, cylindrical roller and spherical roller types of metric design covers: Identification Code Symbols and Nomenclature Boundary Dimensions Tolerances Mounting Dimensions All bearings and components 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 bearings or components of the same size may depend on bearing features which are not standardized. Hence, the substitution of one make of standard bearing for another should only be made after careful comparison of their characteristics and consideration of the requirements of the particular application.
2. IDENTIFICATION CODE
2.1 Scope of Code This code identifies and, as far as possible, describes each thrust bearing or component on the basis of complete dimensional interchangeability. This code establishes a universal language for describing and identifying metric design thrust bearings and components of the types covered in this standard in order to facilitate communications between the user and the manufacturer. The code is also intended to simplify the handling by user personnel of identical bearings made by different manufacturers, whose identification numbers may be different. This code applies only to those thrust bearings or components whose boundary dimensions and tolerances conform to this standard. 2.2 Code The identification code for thrust bearings of ball, cylindrical roller and spherical roller types of metric design is made up of three parts: 1 . A one, two, three or four digit number identifying the bearing bore in millimetres. 2. The letter T identifying a thrust bearing followed by one or two arbitrarily chosen letters identifying the type of thrust bearing as shown in Table 1 and 2. 3. An arbitrarily chosen two digit number identifying the bearing series within its class as shown in Table 3.
3. SYMBOLS AND NOMENCLATURE
d = bore diameter of shaft washer, single direction bearing, nominal ∆d mp = single plane mean bore diameter deviation of central shaft washer, single direction bearing d 1 = outside diameter of shaft washer, single direction bearing, nominal d 1 smax = largest single outside diameter of shaft washer d 2 = bore diameter of central shaft washer, double direction bearing, nominal ∆d 2mp = single plane mean bore diameter deviation of central shaft washer, double direction bearing d 3 = outside diameter of central shaft washer, nominal d 3smax = largest single outside diameter of central shaft washer D = outside diameter of housing washer, nominal ∆D mp = single plane mean outside diameter deviation D 1 = bore diameter of housing washer, nominal D 1 smin = smallest single bore diameter of housing washer T = bearing height, single direction bearing, nominal ∆T s = deviation of the actual bearing height, single direction bearing T 1 = bearing height, double direction bearing, nominal ∆T 1 s = deviation of the actual bearing height, double direction bearing B = height of central shaft washer, nominal r = back face chamfer dimension of shaft washer (single direction bearing) and housing washer r smin = smallest single dimension of r r 1 = face chamfer dimension of central shaft washer r 1 smin = smallest single dimension of r 1 S e = raceway parallelism with the face, housing mounted race or washer S i = raceway parallelism with the face, bore mounted race or washer V dp = roundness or bore diameter variation in a single radial plane V Dp = roundness or outside diameter variation in a single radial plane
ABMA 24.1:1989(S2010) pdf download
