BS ISO 355:2019 pdf free.Rolling bearings – Tapered roller bearings -Boundary dimensions and series designations.
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 https://www.iso.org/obp IEC Electropedia: available at http://www.electropedia.org/ 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(1]. 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 Clause 6.The bearing and subunit boundary dimensions given in Tables 4 to 16 are grouped by contact angle series and then listed in ascending order of bore, outside diameter and bearing width. Tolerances for the dimensions shall be as given in ISO 492. Maximum chamfer dimensions shall be in accordance with ISO 582. In this document, no values are given for the inner ring and outer ring front face chamfer dimension, r2. However, the front face corners shall not be sharp. BS ISO 355 pdf download.