FAG N1920-K-M1-SP CYLINDRICAL ROLLER BEARING

Cylindrical roller bearings N19..-K-M1-SP, non-locating bearing, with tapered bore, taper 1:12, separable, with cage, reduced radial internal clearance, restricted tolerances

These FAG cylindrical roller bearings provide an extremely low runout deviation as well as a precise adjustment of the radial internal bearing clearance already during assembly. They were designed for applications with high radial loads and the highest demands on rotational accuracy.

Explanation:
• N: Single-row bearing with two flanges on the inner ring and without flanges on the outer ring
• K: Tapered bore with a taper ratio of 1:12
• M1: Two-piece brass cage, roller-guided
• SP: Special precision class 'Super Precision' for highest accuracy requirements

Features:
The N design of this FAG bearing has two flanges on the inner ring, while the outer ring is flange-free. This construction allows axial displacement of the shaft in both directions and makes the bearing particularly suitable for floating bearing applications. Length changes due to thermal expansion or shaft movements are absorbed by the displacement of the rollers on the raceway without generating additional loads. The outer ring is removable. Inner ring, cage and rollers form a compact unit, which facilitates assembly and replacement in the workshop. The tapered bore with a ratio of 1:12 ensures an even press fit during mounting and enables precise adjustment of the radial internal bearing clearance according to the respective operating conditions. The two-piece, roller-guided brass cage ensures a stable distribution of the rollers around the entire circumference. Even at high speeds it reduces the risk of interactions between the rolling elements. The SP precision class offers dimensional accuracy at the level of tolerance class P5 as well as running accuracy close to class P4 while providing an extremely low runout deviation. These properties are indispensable for machine tool spindles that are exposed to high speeds and loads.

Maintenance:
These FAG cylindrical roller bearings of this series are supplied without an integrated seal (open bearing design). Therefore suitable lubrication is required already at commissioning. The choice of lubricant (oil or grease) depends on speed, load and ambient temperature. Re-lubrication intervals should be determined according to the actual operating conditions. Factors such as temperature, possible contaminants and the intensity of the loads should be taken into account. In open or particularly exposed environments additional protective measures such as covers, labyrinth seals or protective rings should be provided to minimize the ingress of solid particles or liquids. The operating temperature should be monitored regularly. An unusual temperature rise can indicate lack of lubrication, overload or alignment errors. Regular vibration and noise checks enable early detection of damage to raceways or rollers. Irregular noises or unusual vibrations require immediate inspection. When mounting on a tapered bore the press fit must be adjusted carefully to precisely control the radial internal bearing clearance. Insufficient mounting leads to excessive residual clearance, while excessive pressing can cause preload of the bearing and shorten its service life.

Strengths:
• Compensation of thermal axial expansions without additional loading of the shaft thanks to the integrated floating bearing function
• Simplified replacement due to the separable design of the outer ring
• Precise adjustment of the radial internal bearing clearance during assembly thanks to tapered bore 1:12
• Extremely low runout deviation (SP class) and high running accuracy
• Stable roller guidance even at high speeds due to the brass cage

Applications:
These FAG cylindrical roller bearings of this series are primarily used in machine tool construction. They provide the radial support of the main spindle, where rotational accuracy directly influences machining quality. Milling machines, CNC lathes, grinding machines and machining centers are typical application areas in which these bearings are used as spindle bearings. The SP precision class meets the high accuracy requirements that are necessary for these machines in continuous operation. In addition, they are used in the printing industry where impression cylinders must ensure constant radial stability even at high speeds. The high stiffness and running accuracy of these bearings help to ensure consistently high print quality across the entire web width.