NA 118

DIN Standards Committee Rolling Bearings and Plain Bearings


Rolling bearings - Noise testing of rolling bearing greases - Part 1: Basic principles, testing assembly and test machine


This document was prepared by Technical Committee ISO/TC 4, Rolling Bearings. This document covers basic principles, requirements for the testing assembly and the test machine to determine and assess the noise characteristics of bearing grease jointly with ISO 21250-2, ISO 21250-3 and ISO 21250-4. This document specifies: - basic principles, testing assembly and the test machine for noise testing of rolling bearing greases; - symbols used in the test methods BQ+, MQ and NQ. This document is applicable for testing rolling bearing greases, especially of unused grease. NOTE Suitable greases are greases of NLGI classes 1 to 3 according to DIN 51818. Suitable greases for lubrication of rolling bearings are especially greases according to ISO 12924. The test method according to this document delivers meaningful results for rolling bearings, however, it can also be applied for greases in similar applications.



Planned document number

DIN ISO 21250-1

Project number


Responsible national committee

NA 118-01-04 AA - Tolerances, measuring and gauging principles and methods 

Responsible international committee

ISO/TC 4 - Rolling bearings 


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