# Cylindrical roller bearings

## Description

Full complement cylindrical roller bearings are cage-free, meaning that a maximum number of rolling elements can be accommodated. For this reason, full complement bearings can be subjected to particularly high radial loads, while the limiting speed is significantly lower than that of cylindrical roller bearings.
Thanks to shoulders that are appropriately situated at the bearing rings, the bearings also carry axial forces in one direction. For axial counterstay, place a second bearing mirror-inverted to the first.
Single row full complement cylindrical roller bearings are – except for NJG23..VH series – not detachable.

## Dimensions/standards

In single row full complement cylindrical roller bearings, the main dimensions are standardized according to ISO 15 (Radial bearings – boundary dimensions), DIN 616 (Roller bearings – boundary dimensions) or DIN 5412-1 (Roller bearings – cylindrical roller bearings – single row).

## Tolerances

As the default, we manufacture single-row full complement cylindrical roller bearings at SLF with standard tolerances (PN) according to DIN 620-2 (Roller bearing tolerances – tolerances for radial bearings) and ISO 492 (Radial bearings – dimensions and tolerances). We also deliver the bearings with other tolerances.

## Bearing design types

Bearings in the NCF18..V, NCF29..V and NCF30..V series are equipped with two fixed shoulders at the inner ring and one fixed shoulder at the outer ring. At the outer ring’s shoulder-free side, a locking ring prevents the rollers from dropping out. Axial forces are only transmitted in the direction of the fixed outer ring shoulder.

Single-row full-type cylindrical roller bearings are – except in the NJG23..VH series – not detachable. Bearings in the NJG23..VH series carry axial forces in the direction of the inner ring shoulder. In these bearings, the roller cage assembly is non-detachable from the outer ring so that the rolling elements do not drop out even if the inner ring has been taken off.

## Clearance

SLF-made cylindrical roller bearings are standard delivered in the clearance class CN according to DIN 620-4 (Roller bearing tolerances – radial clearance) and ISO 5753-1 (Roller bearings – clearance – radial clearance). We can supply design types in other clearance classes or special clearance upon request.

Clearance table for cylindrical roller bearings:

## Cage

Full complement cylindrical roller bearings are cageless.

## Working temperature

SLF single-row full complement cylindrical roller bearings with a maximum 120 mm outer diameter are standard stabilized in dimensions by S0, meaning that they are subjected to heat treatment that makes them usable up to 150 °C. Above a 120 mm outer diameter, the cylindrical roller bearings are standard stabilized in dimensions by S1, meaning that they are heat treated to make them usable up to a working temperature of 200 °C. However, as a rule, the maximum working temperature is not limited by the dimensional stability of the inner rings and rollers. In many cases, it is limited by the lubricant. Please find the necessary information in the relevant chapters. If you are uncertain or have specific questions regarding our bearings’ temperature limits, don’t hesitate to contact the SLF team.

## Greasing/lubrication & sealing

We manufacture single-row full complement cylindrical roller bearings without seals. Consequently, the bearing location must be sealed around/ on the surrounding components. The sealing must ensure that no moisture and/ or contaminants can enter the bearing and that no lubricant is lost.
The cylindrical roller bearings are delivered ungreased but must be lubricated with oil or grease. Choose the lubricant according to the application.

## Dimensioning

There may exist an axial force Fa in addition to the radial force Fr. The ratio of load must be considered.


 $$P = F_r$$ for $$\frac{F_a}{F_r} \leq{e}$$ $$P = 0,92 * F_r + Y * F_a$$ for $$\frac{F_a}{F_r} > e$$

### Factors e and Y for single-row, full complement cylindrical roller bearings

Series Mathematic factors
e Y
NCF180,20,6
NCF29, NCF30, NJG230,30,4

$$P_0 = F_{0r}$$

$$S_{0} = \frac{C_0}{P_0}$$
$$P > \frac{C_0}{60}$$