PACAMOR KUBAR BEARINGS (PKB) extremely high precision specialty ball bearings are found in many challenging aerospace and defense applications. PKB's specialty ball bearing designs are found in near-earth and cryogenic missions, life-sustaining survival suits for space exploration, public and private rocket launches and well known NASA space projects. PKB manufactures a wide variety of specialty ball bearings for space vehicles, guidance systems, array mechanisms, flow meters and flow control units that are used in some pretty extreme environments like the James Webb Space Telescope or JWST. PKB engineers are available to help customize your bearing design with a variety of special features, including, but not limited to: Modified Dimensions Angular Contact Full Complement Thin Section Corrosion Resistant Cryogenic Heat Treat Optimized Temper Cycles Retainer material options Bearing testing & documentation Optional Ceramic balls Bearing closures Coded Bores & ODs Flanges Coatings Highly finished, honed surfaces Other unique features are offered to ensure a proper fit & optimum functionality Stainless steel (440C) high precision specialty ball bearings for use in the extreme temperature ranges of space applications are available in standard inch sizes and various metric sizes. A variety of special features, including, but not limited to, special heat treat options, retainer materials, lubricants, flanges, modified dimensions, and other unique features are offered to ensure a proper fit in the upper level assembly.