Abstract: This invention provides a novel method for the production of reproducible parts formed from beryllium copper alloys. More specifically, the invention provides a process for the production of mill hardened beryllium copper strip, wire, rod or tubing with improved mechanical properties from which formed parts can be age hardened in a reproducible manner to give minimal distortion and improved mechanical properties over a broad range of temperatures. To this end the process comprises a deries of mechanical and thermal treatments which minimize or eliminate non-reproducible distortion by decreasing the magnitude of the residual stresses throughout the various steps of the process before the formation of precipitates becomes the dominant mechanism and by providing a more even patterned distribution of precipitates in the matrix of the alloy both prior to and after a thermal aging process.