Standardly fitted with a PA66 roller-centered cage:

Non-reinforced with glass fiber for inner ring diameters up to 85 mm (no suffix)

Brass alloy cage for larger bore sizes (suffix MR)

Ideal for a broad range of precision applications

Engineered with optimized internal geometry and cage to sustain higher speeds.

Feature fewer rollers compared to basic design bearings.

Equipped with an outer ring-centered cage to maximize lubricant effectiveness and prevent lubricant starvation at elevated speeds. The cage options include:

Asymmetrical, glass fiber reinforced PEEK cage (suffix TP)

Symmetrical, carbon fiber reinforced PEEK cage (suffix TP1), offering superior guidance and lubrication conditions. These bearings can achieve speeds up to 30% higher when grease lubricated and up to 15% higher with an oil-air lubrication system.

For specific applications like the non-tool end of a motorized spindle, where speed takes precedence over rigidity, bearings with half the number of rollers is available upon request.

NN 30, NN 39 an NN 49 series (see (fig. 2))

Deliver a balanced performance in terms of load capacity, rigidity, and speed, making them the go-to choose for the non-tool end bearing in machine tool spindles.

Feature three integral flanges on the inner ring and none on the outer ring

NNU 49 series (see (fig. 3))

Offer higher stiffness at a reduced cross-sectional height but have a slightly lower load capacity compared to NN 39 series.

Come with three integral flanges on the outer ring and none on the inner ring.

Both series can be ordered with either a cylindrical or a 1:12 tapered bore (suffix KR), with the latter being the preferred choice in machine tool applications for more precise clearance or preload adjustments.

To optimize lubrication, all NNU 49 series bearings and NN 39 series bearings with a bore diameter of d ≥ 100 mm feature an annular groove and four lubrication holes in the outer ring (see (fig. 4), suffix E44).

Bearings lacking an annular groove and lubrication holes are typically lubricated with either a minimal amount of grease or precisely metered small quantities of oil or oil-air. In such cases, the lubricant is administered through a side-positioned nozzle (see (fig. 5), suffix W33).

For NN 30 series bearings with a bore diameter of d ≤ 130 mm requiring an annular groove, nozzle and lubrication holes, early consultation with BRZB is advised.

Bearings with Pre-Ground Raceway

For applications demanding extremely high running accuracy, BRZB suggests installing the flangeless inner ring of an NNU 49 series bearing onto the shaft, followed by finish-grinding the inner ring raceway and other shaft diameters in a single operation. BRZB offers these bearings with a tapered bore and a finish-grinding allowance on the inner ring raceway (Prefix U).