ANSI ABMA 19.2:1994 pdf free download – TAPERED ROLLER BEARINGS  RADIAL INCH  DESIGN
1  Scope
This  standard covers inch design radiai tapered roller bearings of various types, part numbering systems, tolerances, and fitting practices. For boundary dimensions, refer to manufacturers’ catalogs. Tapered roller thrust bearings are covered in ANSUABMA Standard  23.2.
General ABMA standards which apply to various types of bearings should be consulted for tolerance definitions, gauging practices, mounting accessories, and method of evaluating load ratings
2  Part  Numbering
Systems 2.1 Identification Code.  Inch design tapered roller bearings are numbered in an identical manner or reference is made to the universal number by all producers. Therefore, an identification code  for  the use of bearing users to provide a universal language for describing  and identifying these products is not required.
2.1.1 Individual Component Part Numbers.
Unlike other bearing types, tapered roller bearing cones and cups are individually numbered. The cone is assembled with rollers and a cage, and when used with a cup, makes a complete bearing assembly. Both cone and cup numbers are required to identify a complete bearing assembly. The cone number followed by the cup number is the preferred practice.
2.2.3 Section  2-Angularity  Designation. The 1st digit following the prefix is  an  indicator of the angularity of the bearing series according to  the following code:
The bearing series indication will be related to the maximum theoretical bore of the bearing or the diameter of the cone at the small end of the roller, in order that smaller numbers will indicate smaller sizes of bearings and larger numbers will indicate larger sizes of bearings. For the present, the series numbers indicated by the absence of any digit or by the single digit 0 to 9 inclusive, have been reserved for future development of extremely small sized tapered roller bearings, if required. Likewise, the numbers 900 to 999, inclusive, have been reserved for future development of extremely large bore tapered roller bearings, if required. The selection of the basic series indication in relation to the maximum theoretical bore of the bearing will then be in accordance with the tabulation below.
2.2.5 Section 4 – Component Number. The last two numeric digits will indicate the part number of the bearing component. Roller numbers will be indicated by the digits 01 to 04, inclusive, but these numbers will not appear on the bearings. They are used for manufacturing identification. Cage numbers will be indicated by the digits 05 to 09, inclusive. These numbers will not appear on the bearings. They are used for manufacturing identification. Cup numbers will be indicated by the digits 10 to 19, inclusive, the first cup made to minimum section in any series starting with the number 10. If more numbers are required in any series, numbers 20 and up will be utilized where available. Cone numbers will be indicated by the digits 30 to 49, inclusive, the first cone made to minimum section in any series being numbered 49.If more numbers are required for the cones in any one series, number 29 and below will be utilized where available.