A bearing assembly comprising: a bearing sleeve configured to couple to a pump shaft, and also configured with a bearing sleeve surface having bores (42a - 42h) for receiving fasteners, the bores (42a - 42h) being arranged uniformly about the pump shaft at a first predetermined angle; and an adjusting nut configured with a central bore having central bore threads to rotationally couple to pump shaft threads of the pump shaft, configured to rotate in relation to the bearing sleeve and move the pump shaft axially to adjust an impeller clearance between a working side of an impeller arranged on the pump shaft and a casing of rotating equipment, and configured with an adjusting nut surface having openings (52a - 52f, 152a - 152j) that are different in number than the bores (42a - 42h), the openings (52a - 52f, 152a - 152j) being arranged uniformly about the pump shaft at a second predetermined angle that is different from the first predetermined angle; sets of corresponding bores (42a - 42h) and openings (52a - 52f, 152a - 152j) configured to align at predetermined angular intervals defined by a differential relationship between the first predetermined angle and the second predetermined angle, e.g., including at the predetermined angular intervals of about every 9° or 15°, when the adjusting nut is rotated in relation to the bearing sleeve in either direction in order to receive fasteners to couple the adjusting nut to the bearing sleeve when the adjustment of the impeller clearance is completed, characterized in that i) either the bores (42a - 42h) include eight bores, and the openings (52a - 52f, 152a - 152j) include six openings, or the bores (42a - 42h) include six bores, and the openings (52a - 52f, 152a - 152j) include eight openings; and the predetermined angular intervals are about 15°; or in that ii) either the bores (42a - 42h) include eight bores, and the openings (52a - 52f, 152a - 152j) include ten openings, or the bores (42a - 42h) include ten bores, and the openings (52a - 52f, 152a - 152j) include eight openings; and the predetermined angular intervals are about 9°. a bearing sleeve configured to couple to a pump shaft, and also configured with a bearing sleeve surface having bores (42a - 42h) for receiving fasteners, the bores (42a - 42h) being arranged uniformly about the pump shaft at a first predetermined angle; and an adjusting nut configured with a central bore having central bore threads to rotationally couple to pump shaft threads of the pump shaft, configured to rotate in relation to the bearing sleeve and move the pump shaft axially to adjust an impeller clearance between a working side of an impeller arranged on the pump shaft and a casing of rotating equipment, and configured with an adjusting nut surface having openings (52a - 52f, 152a - 152j) that are different in number than the bores (42a - 42h), the openings (52a - 52f, 152a - 152j) being arranged uniformly about the pump shaft at a second predetermined angle that is different from the first predetermined angle; sets of corresponding bores (42a - 42h) and openings (52a - 52f, 152a - 152j) configured to align at predetermined angular intervals defined by a differential relationship between the first predetermined angle and the second predetermined angle, e.g., including at the predetermined angular intervals of about every 9° or 15°, when the adjusting nut is rotated in relation to the bearing sleeve in either direction in order to receive fasteners to couple the adjusting nut to the bearing sleeve when the adjustment of the impeller clearance is completed, i) either the bores (42a - 42h) include eight bores, and the openings (52a - 52f, 152a - 152j) include six openings, or the bores (42a - 42h) include six bores, and the openings (52a - 52f, 152a - 152j) include eight openings; and the predetermined angular intervals are about 15°; or in that the bores (42a - 42h) include eight bores, and the openings (52a - 52f, 152a - 152j) include six openings, or the bores (42a - 42h) include six bores, and the openings (52a - 52f, 152a - 152j) include eight openings; and the predetermined angular intervals are about 15°; or in that ii) either the bores (42a - 42h) include eight bores, and the openings (52a - 52f, 152a - 152j) include ten openings, or the bores (42a - 42h) include ten bores, and the openings (52a - 52f, 152a - 152j) include eight openings; and the predetermined angular intervals are about 9°. the bores (42a - 42h) include eight bores, and the openings (52a - 52f, 152a - 152j) include ten openings, or the bores (42a - 42h) include ten bores, and the openings (52a - 52f, 152a - 152j) include eight openings; and the predetermined angular intervals are about 9°.