ASTM D1403
CONE PENETRATION OF LUBRICATING GREASE USING 1/4 AND 1/2 SCALE CONE EQUIPMENT.
These test methods cover two procedures for measuring the consistency of small samples of lubricating greases by penetration of a 1/4-scale cone or a 1/2-scale cone. These test methods include procedures for the measurement of unworked and worked penetrations.