ISO 355-2019 pdf free.Rolling bearings – Tapered roller bearings – Boundary dimensions and series designations.
This document specifies bearing and subunit boundary dimensions for complete single-row and double- row tapered roller bearings. It also specifies the flange dimensions of flanged outer rings (or a selection of these bearings. A series designation for each bearing is also specified.
2 Normative references
The following documents are referred to in the text in such a way that some or all of their content constitutes requirements of this document. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies.
Iso 492, Rolling bearings — Radial bearings — Geometrical product specifications (GPS) and tolerance values
Iso 582, Rolling bearings — Chamfer dimensions — Maximum values
ISO 1132-1, Rolling bearings — Tolerances — Part 1: Terms and definitions
ISO 5593, Rolling bearings — Vocabulary
ISO 1S241, Rolling haringc — Symbols for phyiral quantitiec
3 Terms and definitions
For the purposes of this document, the terms and definitions given in ISO 1132-1 and ISO 5593 apply.
ISO and IEC maintain terminological databases for use in standardization at the following addresses:
— ISO Online browsing platform: available at htt.psiJ/www.isoorg/obp
— IEC Electropedia: available at
4 Symbols
For the purposes ot this document, the symbols given in ISO 15241 and the toliowing apply.
The symbols shown in Figures 1 to 4 and the values given in ThblesA to 16 denote nominal dimensions unless specified otherwise.
5 Series designations
Each bearing whose dimensions are given in this document is referred to a dimension series. The dimension series is designated by a combination of three symbols, for example 2AC. The dimension series designation can be used to build a tapered roller bearing designation according to ISO 10317(11.
The first symbol is a numeric character, which represents a range of contact angles (contact angle series).
The second symbol is an alphabetic character, which represents a range of numeric values for the outside diameter to bore relationship (diameter series).
The third symbol is an alphabetic character, which represents a range of numeric values for the width to height relationship of a single-row bearing (width series).
The designations for the standardized bearings generally conform with the angle ranges and the numeric values for the relationships given in Tables 1 to 3. In some cases, an exception has been made to avoid the condition that the same designation be used for two different bearings with the same bore diameter.
The series designations shown in this clause shall not be applied to bearings other than those specified in Clausc.6.ISO 355 pdf free download.