1.1''This specification covers requirements for metric series, tapered roller bearings with a single row of rollers.

1.2''Intended Use'''The bearings covered in this specification are intended to be used in general industrial and vehicle applications where the operating temperature does not exceed 120'''''C (250'''''F).

1.3''This specification contains many of the requirements of DS3225, which was originally developed by the Department of Defense and maintained by the Defense Supply Center in Richmond. The following government activity codes may be found in the Department of Defense, Standardization Directory SD-1.2

1.4''The values stated in SI units are to be regarded as standard. No other units of measurement are included in this standard.

1.5''This standard does not purport to address all of the safety concerns, if any, associated with its use. It is the responsibility of the user of this standard to establish appropriate safety, health, and environmental practices and determine the applicability of regulatory limitations prior to use.

1.6''This international standard was developed in accordance with internationally recognized principles on standardization established in the Decision on Principles for the Development of International Standards, Guides and Recommendations issued by the World Trade Organization Technical Barriers to Trade (TBT) Committee.