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aircraft bearing AISI M-50 balls AMS 5749 balls AMS 5900 balls ball fatigue balls at visible balls tested Bearing materials cold heading procedure confidence number considered is real contact angle cool cool cool corrosion cracks were crossed cracks were omitted crossed by running Deep freeze 189 fatigue failure fatigue life results five-ball fatigue tester Five-ball test HARDNESS AND RETAINED headed AMS 5900 hr Temper 797 identical conditions initiated fatigue spalls Lewis Research Center lot A AMS lot A balls lower balls lubricant maximum Hertz stress million stress cycles naphthenic mineral oil NASA percent Performing Organization powder-processed VIM-VAR AMS premium quality material retained austenite Rolling-element bearings running tracks salt shaft speed spall originating stress of 5.52 superrefined naphthenic mineral test assembly TEST MATERIALS Material test series upper ball upper test ball upper-ball stress cycles vacuum arc remelt VIM-VAR AISI M-50 visible surface cracks warm headed AMS warm headed balls