Insert Ball Bearing Units

Yes. The UC series wide inner ring insert bearing is dimensionally identical for equivalent bore sizes across all four housing formats: UCP200 pillow block, UCF200 4-bolt square flange, UCFL200 2-bolt oval flange, and UCT200 take-up unit. This means one UC insert type covers all standard-duty mounted bearing positions on the same machine, simplifying spare parts inventory. UCX inserts fit UCPX00/UCFX00/UCTX00 medium-duty housings only.

UC series setscrews apply clamping force at two points (120° apart) on the shaft surface. The grip is fixed by the torque applied at installation and does not change under operating load. NA series eccentric collar tightens under unidirectional shaft rotation — the eccentric geometry creates a wedging force that increases with operating torque, providing progressively more secure retention under sustained belt load and vibration. NA series must not be used on reversing drives: the collar releases when the shaft rotates opposite to the lock direction.

The UK series 1:12 tapered bore with H-series adapter sleeve distributes clamping load over the full sleeve contact length, leaving no marks on the shaft surface when removed. Setscrew retention concentrates load at two small contact points, creating fretting damage and indentations that progressively weaken the shaft surface with each retightening. UK adapter sleeve locking is the correct choice for rough-turned or as-machined shafts, for shafts that will be reused between bearing replacements, and for take-up positions where the bearing is released and re-locked repeatedly as belt tension is adjusted.

The spherical outer ring (standard on UC, NA, UK, HC series) has an outer diameter that is ground to a sphere to match a corresponding spherical seat inside the housing. This allows the bearing to self-align up to 2 degrees to compensate for shaft misalignment and mounting surface distortion. It does not reduce radial load capacity compared to a cylindrical OD bearing of equivalent bore — the load path is through the rolling elements and inner ring, not through the spherical OD seat.

CS-2RS is a double rubber-sealed deep groove ball bearing in insert bearing form. The 2RS seals prevent lubricant escape and contamination ingress, making the unit maintenance-free for its rated service life in clean to moderately contaminated environments. Choose CS-2RS when re-lubrication access is impractical or when the application requires no grease fitting (sealed food-grade, pharmaceutical, or automation positions). UC series with a standard rubber seal can also be re-lubricated via the grease fitting for longer service life in heavily contaminated environments.

Tightening torque depends on the setscrew size, which varies by bearing bore: UC204–UC206 (20–30 mm) M6×1, torque 3.9 N·m max; UC207–UC209 (35–45 mm) M8×1, torque 7.8 N·m max; UC210–UC212 (50–60 mm) M10×1.25, torque 16.6 N·m max; UC213–UC218 (65–90 mm) M12×1.5, torque 29.4 N·m max. Apply torque to both setscrews at 120° apart. Do not exceed maximum torque — overtightening can crack the inner ring set screw hole.