[[wiki-architecture]] · [[Building Materials]] · [[ARCHITECTURE]] · [[000]] # Timken OK Load Timken OK Load is a standardised measurement that indicates the possible performance of extreme pressure (EP) additives in a lubricating grease or oil. The units of measurement are pounds-force or kilograms-force. This measurement is performed using a special test machine and standard block and ring test specimens. The test machine is based on a machine manufactured by the Timken Company from 1935 to 1972. It is now an industry-recognized standard test to compare extreme pressure resistance of greases and oils in a reproducible way. It is not to be confused with some smaller lubricity testers that are also often erroneously called Timken: The confusion originates from a now obsolete Italian brand TIMPKEN. The test machine consists of a standardized bearing race mounted on a tapered arbour rotating at high speed. The race is brought into contact with a square steel test block under a constant load. The contact area is flooded with the lubricant or grease being tested. The Timken OK Load is the highest standard load at which the spinning bearing race produces no scouring mark on the test block, but only a uniform wear scar. Timken OK Loads are listed on grease and oil property charts and are part of many specifications. It was once generally assumed that the measure and the film strength of the lubricant were directly related. Today, the primary purpose of the test is to determine whether EP additives are present and functioning. A measure of 35 pounds (16 kilograms-force or 155 newtons) or more means that EP additives are present and working well. The Timken OK Load test methods are ASTM D-2509 for greases and ASTM D-2782 for oils. There are a few portable versions of smaller testers utilizing similar test methods for public demonstration or for product showcase. == References == - [[Professional Practice/Codes & Standards/National Building Code of India/Part 06 - Structural Design/Section 1 - Loads Forces and Effects]] - [[History and Theory/World History/Classical Architecture]] - [[Building Services/Building Performance/Building Envelope]] - [[Urban and Planning/Urban Design Principles]] - [[Environmental Design/Strong Foundations for Sustainable Constructions/pillars]] - [[Building Services/Fire Engineering]] - [[Building Construction/Specifications and Detailing/Construction Specifications]] - [[Building Construction/Construction & Materials/Building Material]] - [[Professional Practice/Codes & Standards/National Building Code of India/Part 09 - Plumbing Services]] - [[History and Theory/Temple Architecture]]