Patent ID: 7808140

Claim:
A submersible pump motor, comprising: a rotatable shaft; a metallic sleeve coupled to the rotatable shaft for rotation therewith; a rotor section coupled to the rotatable shaft for rotation therewith; a housing for receiving the shaft, the sleeve and the rotor section, the housing being filled with a dielectric lubricant; a stator section coupled to and positioned within the housing; a metallic tubular bearing body immersed in the lubricant and having an inner cylindrical surface that mates with and receives an outer cylindrical surface of the sleeve, the bearing body coupled to and positioned for non rotation within the housing; wherein at least one of the cylindrical surfaces of the sleeve and the bearing body comprises a coating comprised of a nickel-boron; and wherein a thickness of the nickel-boron coating is about 0.00075 inches plus or minus 0.00025 inches.