In short, the cone will penetrate more into a soft grease. For example, a 28.5mm cone’s distance is a 285 penetration score (285x 0.1 mm). Thus, penetration is the depth, measured to an accuracy of 0.1 mm to which a standard cone sinks into the grease. Finally, the cone’s distance traveled into the grease is measured and reported as penetration in a tenth of a millimeter (0.1 mm). During this test, a double tapered cone is allowed to sink freely into a grease cup for 5 seconds at 25☌ under its weight. Therefore, lubricating grease consistency or NLGI grade is the first and foremost requirement. A grease consistency or penetration score indicates grease consistency or stiffness to help predict how it will migrate, stay, or flow in a typical grease application.
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