6800 series bearings

Single row deep groove ball bearings are the most widely used bearing type (fig. 1). They are available capped (with seals or shields) or open. Open bearings that are also available capped may have recesses in the ring side faces (fig. 2).

Inch bearings in the EE(B), RLS and RMS series are intended as aftermarket items and, therefore, recommends not using these bearings for new bearing arrangement designs.

SKF can also supply bearings with a tapered bore. For detailed information, contact SKF.

The product range also includes bearings with an inner diameter of taper holes. For more information, please contact us.

(fig.1)

(fig. 2)

Selection guidelines for different capping devices under various operating conditions are listed in table 1. However, these guidelines cannot substitute for testing a shield or seal in its application. For additional information, refer to Integral sealing.

(table 1)

The seals, which are fitted in a recess on the outer ring, make good, positive contact with the recess, without deforming the outer ring. The capping devices are available as:

Shields

are identified by the designation suffix Z

are primarily intended for applications where the inner ring rotates

are fitted in the outer ring and form a narrow gap with the inner ring

are made of sheet steel

are available as standard with an extension in the shield bore (fig. 3), expect some sizes without extension

protect from dirt and debris without friction losses

(fig. 3)

Non-contact seals

are identified by the designation suffix RZ (fig. 4)

provide better sealing effectiveness than shields

can be operated at the same speeds as shields

form an extremely narrow gap with the inner ring shoulder

are made of sheet steel reinforced NBR (oil- and wear-resistant)

(fig. 4)

Low-friction seals

are identified by the designation suffixes RSL or RST

provide better sealing effectiveness than non-contact seals

are made of sheet steel reinforced NBR (oil and wear-resistant)

RSL design ( fig. 5 ):

can be operated at the same speeds as shields

make virtually no contact with a recess in the inner ring shoulder

are available for 60, 62, 63 series bearings in two designs, depending on the size

( fig. 5 )

RST design ( fig. 6 ):

make positive contact with a recess in the inner ring shoulder for good sealing effectiveness

are available on request for 60, 62 and 63 series bearings in three RST designs, depending on the size

( fig. 6 )

Contact seals

are identified by the designation suffixes RSH, RSH2, RS1 or RS2

are made of sheet steel reinforced

NBR

FKM (designation suffix RS2 or RSH2, available on request)

are available in different designs depending on the bearing they are used with:

for 60, 62 and 63 series bearings in two RSH designs (fig. 7), depending on the size

for RS1 designs, with sealing either against the inner ring shoulder or against a recess in the inner ring side face (fig. 8); the relevant design is determined by dimension d1 or d2 in the product table.

 (fig. 7)

 (fig. 8)

ICOS oil sealed bearing units

are typically used for applications with sealing requirements exceeding the capabilities of standard sealing solutions, i.e. oil retention

have the following features compared to bearings with external sealing solutions:

need less axial space

simplify mounting

avoid expensive machining of the shaft because the inner ring shoulder is the seal counterface

consist of a 62 series deep groove ball bearing and an SKF WAVE seal (fig. 9):

single lip, spring loaded radial shaft seal

made of NBR

 (fig. 9)