The load-carrying capacities of open, ZZ, and 2RS bearings are identical.

The maximum rotational speed is specified for ZZ bearings (lubricated with grease). For 2RS bearings, two-thirds (2/3) of this value should be used.

The maximum operating temperature for bearings is 120°C for ZZ type and 90°C for 2RS type.

C (kN) Max. d/d (ZZ for ZZ grease-lubricated bearings)

6010             21,79         8.000

6011             28,27         7.200

6012             29,35         6.700

6014             38,05         5.700

6210             35,07         6.600

6211             43,38         6.100

6212             52,42         5.400

6214             62,19         4.700

6310             62,00         5.300

6311             72,00         4.800

6312             81,85         4.500

6314           104,00         3.800

The recommended pulley tolerances are between −40 and −10 microns, meaning the pulley diameter should be machined within 89.96 mm to 89.99 mm to ensure a tight fit with the bearing.

The shaft tolerances are between −9 and −20 microns, meaning the shaft diameter should be approximately between 49.99 mm and 49.98 mm to allow a loose fit with the bearing. To prevent the shaft from coming out of the bearing, measures such as using a retaining ring should be taken.

During the installation of the bearings into the pulley, it is important to ensure that the mounting force is applied only to the outer ring of the bearing to avoid damage.

To achieve this, a tubular fixture designed to press against the outer ring of the bearing can be used. This fixture may be made from a clean, burr-free tube with an inner diameter of 83 mm and an outer diameter of 89 mm, ensuring proper contact with the outer race.

Finally, it is important that the assembly environment and the pulley housing are clean and free from dirt, burrs, and metal particles.

If a service life calculation for the bearing is also desired, the following formula can be used.

L=(c/p) ^3 (C divided by P, raised to the power of 3)

C: Load-carrying capacity of the bearing. For a 6210 bearing, it is 35.07 kN.

P: Load applied to the bearing.

L: Number of revolutions the bearing will rotate, expressed in millions of revolutions.

If you want the service life in hours, the following formula will be used:

Lh: 1000000*L/(60*n)

Lh: Service life in hours

n: Average speed of the bearing during operation, in revolutions per minute (RPM)

As an Example:

c:35 kN      p:3,56 kN     n:400 d/dk (RPM)

35 KN/9,81 :3,56 3560kg (Maximum load that can be applied to the bearing)

L= (35/3,56) ^3=950 million revolutions

Lh=1000000*950/ (60*400) =39583 hours

If the system operates for an average of 5 hours per day:
39,583 / 5 = 7,917 days, which corresponds to approximately 21 years of service life.