Long-Life Bearings
Product Range

Application notes For positions with heavy load at low to moderate speed where shaft deflection or misalignment is present: caster roll trains, crusher main bearings, vibrating screens, ball mills and paper machine drying cylinders. The permitted misalignment is roughly 1.5°–2.5° depending on the series, but self-aligning and high axial load cannot be combined — a large axial load overloads one roller row, so provide a separate thrust bearing. Vibrating-screen duty calls for the screen-type design (reinforced cage plus increased clearance) and a cage resonance check; hot caster zones need stabilising treatment and clearance reserved for thermal growth. Circulating oil is the preferred lubrication; extreme-pressure grease suits the low-speed heavy-load range. Never heat above the tempering temperature when mounting, or hardness will fall away.

Application notes For positions with high radial load at moderate to high speed: mill work rolls and backup rolls, gearboxes, motors and coilers. They carry essentially no axial load — apart from the small locating force taken by flanged designs such as NJ and NUP, axial location must be provided by a separate bearing; misapplication burns the ribs and roller end faces very quickly. Interference fits and temperature rise markedly reduce the operating clearance, so recalculate from the actual interference and the inner/outer ring temperature difference, and move to a larger clearance group where needed. Line contact is sensitive to misalignment: housing bore concentricity and shaft shoulder squareness must be tightly controlled. Lubricate with circulating oil or oil-air; extreme-pressure oil suits the low-speed heavy-load range.

Application notes For positions with combined radial and single-direction axial load where stiffness matters: mining truck wheels, crushers, gearboxes, conveyor pulleys and winch drums. Normally used as a matched pair to carry the reversing axial load, with axial clearance or preload set at assembly — too much preload raises the temperature, too little loses stiffness and lets the rollers skid. Permitted misalignment is only about 2′–4′, so housing concentricity and the preload setting must be confirmed point by point against the duty cycle. Do not overfill with grease, since churning generates heat; change to circulating oil at high speed or high temperature. If the axial-to-radial load ratio stays high, re-check the contact angle and the rating life.

Application notes For positions with very high axial load at low to moderate speed, together with shaft deflection: extruders, vertical mills, cone crushers, mill screw-down gear and kiln thrust rollers. An axial load must always be present — the minimum axial load is normally not less than 2% of the axial dynamic load rating (Fa/Ca ≥ 0.02), otherwise roller skidding smears the raceways and causes early failure. They cannot carry radial load: the radial force must be taken by an adjacent radial bearing, and both bearings must be verified together at the selection stage. The self-aligning action requires the shaft system to permit deflection, so adjacent positions must not be forcibly guided. Lubrication must be generous enough to carry heat away — circulating oil or oil-air preferred.

Application notes For positions with light to moderate load, relatively high speed and large quantities: mill roller tables, belt conveyor idlers, motors, fans and general drives. Sealed units are lubricated for life: maintenance-free, but they must never be washed out, heated or re-greased. Mount with a tool acting on the ring carrying the interference fit and never strike the seal directly. For hot roller-table sections specify high-temperature grease (180 °C class) together with high-temperature seals, and confirm that the limiting speed and dn value are still met. Radial capacity is below that of roller bearings: once heavy load, shock or serious misalignment enters the duty cycle, move to spherical roller or cylindrical roller bearings.

Application notes For positions with high speed plus moderate axial load and a demand for stiffness and running accuracy: the locating end of mill chocks, high-speed gearbox shafts, fans and vertical pumps, precision rotary tables. Preload changes with temperature rise — at high speed the preload and operating clearance must be recalculated from the actual dn value and thermal growth, since excessive preload is the leading cause of heat-related seizure. The axial load direction must be defined; where a reversing axial load exists, add a third bearing or switch to a four-point contact ball bearing. Not suited to heavy shock or severe misalignment (use spherical roller bearings there); in dusty atmospheres upgrade the sealing and prefer circulating oil or oil-air lubrication.

Application notes For low-speed heavy duty with frequently reversing axial load and limited axial space: cone crusher eccentric bushings, rotary kiln support rollers, vertical mill grinding rollers, winches and rotary tables. Note: under purely radial or single-direction axial load the contact degenerates to two-point, increasing ball/raceway sliding and heat generation — for those duties choose angular contact ball bearings or spherical roller bearings instead; four-point designs are also not intended for very high speed. Lubrication must be generous (circulating oil preferred); in dust or slurry use a labyrinth plus multi-lip seal combination and allow for a temperature sensor port to monitor heat build-up.

Application notes For positions where axial load dominates, speed is relatively high and the radial force is taken by an adjacent bearing: vertical pumps and vertical motors, centrifuges, crane hooks, mill screw-down gear and slewing or indexing mechanisms. They must never carry radial load — the radial force has to be taken separately by a cylindrical roller, deep groove ball or spherical roller bearing, and combined loading leads to failure in a very short time. A minimum axial load must be maintained, generally not less than 1%–2% of the axial dynamic load rating, otherwise the balls skid at speed and smear the raceways. Sensitive to misalignment and edge loading: mating faces must be square and concentric. Where compensation is needed, choose the aligning seat washer type or move to a spherical roller thrust bearing. Lubrication must be generous and able to carry heat away (circulating oil or oil-air preferred); on vertical arrangements watch the oil level and the drain path.

Application notes For cases where no catalogue item fits: restricted mounting space, an unusual load spectrum, extreme temperatures, aggressive corrosion or contamination, a need for integrated temperature or vibration ports, or a drop-in replacement for a discontinued imported design. Send us the load spectrum, speed profile, temperature range, mounting dimensions and a failed sample where one is available; we issue a proposal with a life calculation first and only then release it to production. Four points need particular attention on custom designs: minimum load and skidding risk, reachability of the lubrication path, space required by the sealing arrangement, and practicality of mounting and dismounting.