Abreviações dos rolamentos métricos TIMKEN: todas as informações e designações

TIMKEN metric bearing abbreviations: all information and designations

June 24, 2024 Roberto Magalhães

Today we continue our journey to discover the acronyms for tapered roller bearings from the American company Timken. If a few days ago we presented the acronyms for inch bearings, today we detail the designations designed for Timken inch bearings:

J line codes

Some ABMA part numbers (inches) are designed with metric envelope dimensions. The prefix letter J is used in conjunction with the ABMA part numbering system to identify metrically sized and tolerated inner and outer rings. The prefix J appears before the letters of the prefix ABMA. J-Line bearings are listed as inch bearings with metric bore, outside diameter and width. For example: J HM 5 226 49 —

J: metric system, component designation
HM: series prefix
5: Angularity
226: basic series indication
49: Component designation
—: modification suffix

J-prefix

A line of metric bearings originally designed by The Timken Company have also been included in the ISO 355 plan. These Timken bearings are specifically application-oriented and designed for optimal performance. Depending on the application and the type of load, axial and/or radial, the bearing with the ideal angle and section can be selected. For example, pinion bearings have a steep angle, while machine tool bearings are generally designed with a low angle and light cross-section. These bearings, as shown below, demonstrate this feature for 55 mm (2.1654 in.) bore bearings.

Comparison of metric bearing designs for 55 mm (2.1654 in.) bore.

These bearings are also identified with a J prefix, which indicates a metric and tolerated size bearing.

For example: JP 100 49

J: metric system, component designation
Q: Application
100: inner ring hole diameter
49: Component designation

1, application

Indicate the type of application:

C, D and F = general use
N = general purpose and pinion combination
P = high speed
S&T = sprockets
W = high axial loads

2, inner ring hole

The metric bore diameter of the inner ring is included in the part number designation of the inner ring and outer rings.

3, component designation

Same identification as the ABMA part numbering system.

ISO 355 numbering

Because the dimensions indicated by the ISO 15 master plan were not considered ideal for tapered roller bearings, ISO introduced a new numbering system for tapered roller bearings in ISO 355. The ISO 355 numbering system uses three alphanumeric fields to define a series of dimensions. The bearing part number is then defined by adding the inner ring diameter in mm after the series of dimensions. Although the original metric part numbers have been given a new designation in the ISO 355 plan, the original part number is still used.

For example: T 4 CB 100