Abstract: A lubricant metering assembly is disclosed comprised of a lubricant cup positioned within a housing and having a spring-loaded piston assembly including a stem which is caused to move within a cylindrically-shaped passageway including a stem guide formed in a housing. At least one channel of variable cross-sectional area is formed in the stem in a manner to result in an increase in the cross-sectional area of a supply passageway formed by the channel with the stem guide in precise relationship to a decrease in the compressional force of the spring.