ISO 21250-1:2020 PDF

Scope: 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[6]. 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[12][13].

ISO 21250-1:2020 Referenced Document

ISO 15242-1:2015 Rolling bearings - Measuring methods for vibration - Part 1: Fundamentals
ISO 21250-2 Rolling bearings — Noise testing of rolling bearing greases — Part 2: Test and evaluation method BQ+
ISO 21250-3 Rolling bearings — Noise testing of rolling bearing greases — Part 3: Test and evaluation method MQ
ISO 21250-4 Rolling bearings — Noise testing of rolling bearing greases — Part 4: Test and evaluation method NQ
ISO 492 Rolling bearings — Radial bearings — Geometrical product specifications (GPS) and tolerance values*， 2023-06-01 Update
ISO 5593 Rolling bearings — Vocabulary*， 2023-02-28 Update
ISO 5753-1 Rolling bearings - Internal clearance - Part 1: Radial internal clearance for radial bearings

2020 ISO 21250-1:2020 Rolling bearings — Noise testing of rolling bearing greases — Part 1: Basic principles, testing assembly and test machine