25.4x52x15mm Bearing 1inch ID x 52mm OD x 15mm Non-Standard25. 4mm x 52mm x 15mm Ball Bearing 1" inch bore with metric OD Chrome Steel Sealed This single ball bearing combines a 1" inch bore with a 52mm outer diameter and 15mm width, making it a great fit when you need to bridge between imperial and metric sizes. Its a deep groove style used in all sorts of mechanical, commercial, and industrial equipment. Made from high strength chrome steel (52100 alloy), this non standard bearing includes rubber seals to