NPK International (NYSE:NPKI) reported quarterly earnings of $0.12 per share which beat the analyst consensus estimate of $0.11 by 9.09 percent. This is unchanged from the same period last year. The company reported quarterly sales of $75.070 million which beat the analyst consensus estimate of $73.078 million by 2.73 percent. This is a 15.89 percent increase over sales of $64.777 million the same period last year.