Industrial bearings
& linear motion systems

Typical conditions: Roll stands live in a hard thermal regime: radiant heat from the hot strip and heat conducted through the chocks keep the housing warm, grease cokes and thermal growth eats into the operating clearance. Each bite of the rolls brings a shock load, while scale and cooling water keep attacking the seals. The line runs continuously, so an unplanned stop costs hours of output.

Spherical rollers (222/223/230/231/232 with W33 groove) absorb stand deflection and chock misalignment and are the default for back-up rolls; four-row or double-row cylindrical rollers (NU/NJ) carry the radial load with a separable inner ring for fast roll changes; tapered rollers (302/303/322/323) take the axial location. Hot positions specify C3/C4 clearance with machined brass cages and high-temperature grease or oil-air lubrication.

Typical conditions: Crushing, screening and transfer mean shock duty with misalignment: the eccentric shaft of a jaw crusher and the main shaft of a cone crusher take cyclic impact, dust is heavy, ambient temperature swings widely, and grease is washed out or contaminated. One crusher down stops the whole circuit, so spares must be changeable on site within hours.

Spherical rollers (222/223/230, tapered bore +K with adapter sleeve) tolerate shaft deflection and mounting error; reinforced cages and the W33 groove suit impact. Tapered rollers (302/303/322/323) take the axial component, spherical plain bearings GE…ES cover cylinder eyes and rocker arms, and slewing rings serve excavator and stacker platforms. Prefer contact or labyrinth seals and tie the node into centralised lubrication to extend the change interval.

Typical conditions: In the field the enemies are mud, moisture and crop residue. Tillage, harvesting and conveying run at modest speed but heavy load, and in a dusty environment ordinary grease dries out within a season. The only maintenance window is the off-season, so machinery must run a whole season untouched and be replaceable at the field edge in minutes.

Insert units on cast housings (UCP/UCF/UCFL/UCT) and the SA200 series are self-aligning, taking up shaft deflection and welded-frame distortion; an eccentric collar or set screws let an operator swap the unit with one spanner. Double-lip 2RS seals keep mud and water out, and factory grease fill is sized for a season. Hubs and drives use tapered rollers (302/303); conveyors and cleaning use 62xx-2RS.

Typical conditions: Pumps and compressors run fast and continuously with radial and axial forces at the same time: impeller mass and imbalance create constant axial thrust, while coupling misalignment adds radial vibration. Media temperature, corrosion and grease condition all shift the operating clearance, and once vibration rises the seal and impeller soon follow.

Paired angular contacts (70xx/72xx, DB back-to-back or DF face-to-face) give precise preload and two-way axial location, the standard for centrifugal pumps and screw compressors. Cylindrical rollers (NU/NJ) carry the radial load alone so the angular pair handles only thrust; vertical shafts and submersibles use thrust balls (51100/51200). Hot services take C3 clearance and high-temperature grease; corrosive media can be matched with stainless or coated executions.

Typical conditions: Plant auxiliaries run at full load around the clock: fans, coal mills and coal handling see high bearing temperatures, abrasive dust, and maintenance windows that fall only on planned outages. Frequency-driven motors add shaft current, which etches electrical pitting into the raceways and shows up as gradually rising vibration and noise without an obvious cause.

Fans and motors rely on spherical rollers (213/222/223), which soak up shaft deflection and centring error; hot positions get C3/C4 clearance and brass cages so thermal growth cannot seize the bearing. On the motor side shaft current must be considered — electrically insulated or hybrid ceramic options are quoted on request. Dusty coal handling prefers contact seals with centralised lubrication.

Typical conditions: A food plant washes down with water and alkali every shift: moisture and detergent pass the seal and ordinary grease is rinsed out within months. Hygiene audits require the lubricant never to touch product, no stagnant pockets in the housing, and a bearing that survives both freezer cold and oven heat.

Start with sealed 2RS deep groove ball bearings (62xx-2RS, 63xx-2RS) and H1 food-grade grease: no water ingress, no corrosion. Housed positions use stainless SA200 or coated housings so the seat and fasteners do not rust. Conveyors and packaging suit engineered-plastic units (POM/PP), light and washdown-proof; linear guides (LM/LME) need a cover to keep flour and sugar dust off the raceways.