Regal Rexnord
Unmounted Bearings
Regal Rexnord unmounted bearings are standalone rolling - element bearings — including spherical roller, cylindrical roller, tapered roller, ball, and thrust designs — that machine builders and equipment OEMs integrate directly into their own housings, gearboxes, and rotating assemblies.Offered under the Rollway, Link - Belt, and Rex brands, our unmounted bearing portfolio provides the fundamental rotating - element precision and load capacity that enable the design of custom power - transmission systems, machine tools, and heavy industrial equipment.Engineering teams select Regal Rexnord unmounted bearings when they need certified dimensional accuracy to ABMA / ISO tolerance classes, verified material chemistry and heat - treatment quality, and the application - engineering partnership to optimize bearing selection for fatigue life, thermal stability, and lubrication regime.From 25 mm to over 280 mm bore sizes, with cage designs ranging from pressed - steel to machined - brass for high - speed and high - temperature service, our unmounted bearings form the rotating heart of some of industry’s largest and most critical machinery.
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Trusted by Industry Leaders
Double - Row Spherical Roller Design
Inherent self - aligning capability accommodates up to 3° of static and dynamic misalignment, protecting against the edge - load failures that plague rigid bearings in shaft - deflection applications.
High Radial & Axial Combined Load Capacity
Optimized roller profile and raceway geometry distribute contact stress evenly across the rolling element, achieving L10 fatigue lives that exceed catalog ratings under real - world loading.
Severe Vibration & Shock Load Endurance
Through - hardened or case -hardened bearing steel with controlled retained austenite content withstands the impact and vibration that cause surface - initiated spalling in generic bearings.
Broad Bore Range & Dimensional Interchange
Bore sizes from 25 mm to 280 mm in standard ISO and ABMA boundary dimensions enable direct replacement of bearings from all major manufacturers without re - machining shafts or housings.
Custom Cage & Clearance Options
Pressed - steel, machined - brass, and polymer cage designs optimized for speed, temperature, and lubrication type; C2 through C5 internal clearance classes support press - fit and thermal - expansion requirements.
Application - Specific Material Grades
Standard bearing steels for general industrial use, case -hardened steels for high - shock mining and aggregate, and corrosion - resistant grades for food, marine, and chemical processing environments.
Unmounted Bearings in Heavy Industry Applications
Regal Rexnord Rollway unmounted spherical roller bearings have earned their reputation in the most unforgiving industries on earth.Mining operations install them in crusher eccentric shafts, where shock loads regularly exceed three times the nominal rating and dust ingress is constant.Steel mill runout tables subject cylindrical roller bearings to extreme heat, scale contamination, and rapid acceleration cycles that demand carefully specified internal clearance and lubrication systems.Pulp - and - paper plants rely on our large - bore spherical roller bearings in dryer - section rolls, where steam - heated journals create differential thermal expansion that only self - aligning bearings can safely accommodate.Wind - turbine gearbox manufacturers depend on our tapered roller and cylindrical roller bearings for planet - carrier and high - speed shaft positions, where reliability directly impacts energy production and maintenance access costs.In every case, Regal Rexnord application engineers work alongside customer design teams to model bearing life under the specific load spectrum, lubrication conditions, and contamination levels of the intended installation — not just a catalog number.
Unmounted vs.Mounted Bearings: Selection Considerations
Choosing between unmounted and mounted bearings involves tradeoffs among design flexibility, installation complexity, and lifecycle maintenance requirements.Unmounted bearings offer the design engineer maximum freedom to integrate the bearing directly into the machine frame, gearbox housing, or custom assembly, often achieving a more compact, lighter, and cost - optimized design in high - volume OEM production.However, this approach demands precision machining of housing bores and shaft seats, careful bearing setting during assembly, and in -service relubrication access provisions.Mounted bearings, by contrast, shift these responsibilities to the bearing manufacturer, providing a pre - engineered, pre - lubricated, sealed package that simplifies installation and replacement.For end - user maintenance teams replacing bearings in existing equipment, the decision often defaults to whichever style was originally installed.For new equipment designs, Regal Rexnord’s application engineers can evaluate both approaches, weighing factors such as production volume, available machining capability, assembly skill level, and total lifecycle cost to recommend the optimal path.