Cylindrical Roller Bearings FAG NJ217 -E-M1

The FAG NJ217 -E-M1 single-row cylindrical roller bearing combines an 85 mm bore with a support bearing function and a brass cage for radial guidance.

The NJ217 -E-M1 cylindrical roller bearing is a single-row, unshielded radial roller bearing designed for high radial forces. Thanks to the line contact of the cylindrical rollers, the component can withstand high radial loads. As an open rolling bearing, this model operates directly within the machine’s existing lubrication circuit. FAG manufactures this bearing in the standard tolerance class P0/PN (corresponding to ABEC 1) and with normal radial clearance.

What is the NJ217 -E-M1 cylindrical roller bearing suitable for as a support bearing?

The NJ design typically functions as a support bearing in shaft mountings. The outer ring has two fixed flanges, whilst the inner ring is manufactured with a single flange and can be removed from one side. This enables the bearing to accommodate not only radial forces but also axial guidance forces from one direction. In the opposite direction, the design allows for axial displacement, which compensates for temperature-induced changes in the shaft’s length within the bearing arrangement. Typical applications include bearing arrangements with single-sided axial guidance and high radial loads.

What are the distinctive features of the brass cage in the NJ217 -E-M1?

The designation letter ‘M1’ indicates the version with a brass cage. Brass cages offer high strength under dynamic shock loads, severe vibrations or rapid changes in speed. The permissible temperature range extends from –30 to +150 degrees Celsius, ensuring that the cage retains its dimensional stability even when heated. As the outer ring is designed without a groove or lubrication bore, lubricant is supplied via the end faces of the bearing rings. To ensure proper operation, the open bearing requires a clean installation environment with a seal provided by the user.