Timken OK Load is a standardised measurement that indicates the possible performance of extreme pressure (EP) additives in a lubricating grease or oil.
[citation needed] The test machine consists of a standardized bearing race mounted on a tapered arbour rotating at high speed.
[1] Timken OK Loads are listed on grease and oil property charts and are part of many specifications.
A measure of 35 pounds (16 kilograms-force or 155 newtons) or more means that EP additives are present and working well.
There are a few portable versions of smaller testers utilizing similar test methods for public demonstration or for product showcase.