ASTM D3337 method for determining life and torque of lubricating greases
ASTM D3337 standard test method for determining life and torque of lubricating greases in small ball bearings
3. Summary of Test Method
3.1 A single row ball bearing with the test lubricating grease is rotated at a high speed under a constant load and selected temperature. Total running time is determined at completion of the test as a measure of the durability of the grease.
3.2 Running torque can be obtained for a single row ball bearing with the test lubricating grease rotating at 1 r/min and 12 000 r/min.
4. Significance and Use
4.1 This test method is a screening test to differentiate among the expected life of greases in ball bearings running at high temperatures. If torque is a factor in selection of a grease, the test method provides for measurements at both low (1 r/min) and high (12 000 r/min) speeds.
