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"The roll rockets were designed for a maximum thrust of 40 pounds and the pitch and yaw rockets for a maximum thrust of 113 lbs, at an altitude of 200,000 feet."

Jarvis, Calvin R.; Lock, Wilton P. (1965). Operational Experience With the X-15 Reaction Control and Reaction Augmentation Systems. NASA. OCLC 703664750. TN D-2864.
http://www.nasa.gov/centers/dryden/pdf/87709main_H-364.pdf
http:// bobholland.com/me/xlr99_files/x15-2.pdf
http://books.google.com/books/about/Operational_Experience_with_the_X_15_Rea.html?id=FgDsX6fnSV0C