Spindle Bearing Lubricants: Hetman Synthetic Bearing Lubricants are designed to protect rotary valve spindle bearings, the most critical wear points of the rotary valve. Spindle bearings require lubricants that allow the rotor to move quickly while simultaneously combating the tremendous stresses these components are subjected to. Hetman Synthetic Bearing Lubricants are engineered to ensure maximum wear protection without slowing the action. These bearing lubricants protect against corrosion and will not damage plastic components or swell rubber bumpers. 30 ml precision needle oiler. Available in three nontoxic, non-gumming viscosity grades.