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Hardened 440C stainless steel shafts were found to have excellent compatibility with beryllium-copper bearings at high bearing stress levels. Therefore, this steel holds considerable promise for use as a high-performance, corrosion-resistant shaft material. Hardened 300-M shafts were subject to fatigue cracking at bearing stresses above 40,000 psi (the fatigue cracking was similar to that experienced with AISI 4340). Shot peening prior to plating and baking after plating was found to increase the fatigue resistance sufficiently to permit operation at 60,000 psi. Three greases meeting the MIL-G-81322 specification performed well at temperatures to 350 F, and additions of either AsSbS4 or MoS2 were found to enhance the grease performance even further.