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Bearing designations not covered by the basic system

The designations for certain bearing types are either not covered, or are only partially covered, in the Basic bearing designation system.

Y-bearings (insert bearings)

The designations for Y-bearings differ somewhat from those described in the basic designation system and are covered in the relevant product section.

Needle roller bearings

The designations for needle roller bearings do not fully follow the basic designation system and are covered in the relevant product section.

Tapered roller bearings

The designations for metric tapered roller bearings follow either the basic designation system or a designation system, established by ISO in 1977, covered in ISO 355:20071).

Inch tapered roller bearings are designated in accordance with the relevant ANSI/ABMA standard. The designation system for tapered roller bearings is explained in the relevant product section.

Customized bearings

Bearings designed to meet a specific customer requirement are typically designated by a drawing number. The drawing number does not provide any information about the bearing.

Other rolling bearings

Rolling bearings not covered in the Ball bearings and Roller bearings sections, such as super-precision bearings, thin section bearings, slewing bearings or linear bearings, follow designation systems that can differ significantly from the basic designation system.
  1. 1)For details on how to obtain relevant ISO documentation, refer to ISO - International Organisation for Standardization.
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