Radial insert ball bearings are single row, ready-to-fit units comprising a solid outer ring, an inner ring extended on one or both sides, cages made from plastic or sheet steel and seals of type P, R, L or T. Bearings with an inner ring extended on both sides undergo less tilting of the inner ring and therefore run more smoothly.

The outer ring has a spherical or cylindrical outside surface. In combination with an INA housing matched to the design, bearings with a spherical outer ring can compensate for misalignment of the shaft, see link.

With only a few exceptions, radial insert ball bearings can be relubricated. For this purpose, they have two lubrication holes in one plane of the outer ring offset by 180°.

Radial insert ball bearings are particularly easy to fit and are suitable for drawn shafts of grade h6 up to h9. They are located on the shaft by means of eccentric locking collars, grub screws in the inner ring, adapter sleeves, drive slots or fit.

The table, presents the features of the series in detail. Please take these into consideration.

Some series with eccentric locking collar or grub screws in the inner ring are also available with inch size bore dimensions. For further inch size bearings and bearing units, see TPI 127, Radial insert ball bearings/housing units in inch sizes.

For corrosion-resistant bearing arrangements and for applications in the food and drinks industry, there are Corrotect^®-coated bearings with the suffix FA125 and bearings of a corrosion-resistant design. Corrosion-resistant radial insert ball bearings are suitable where moisture, contaminated water, salt spray mist or weakly alkaline and weakly acidic cleaning agents are present, see also TPI 64, Corrosion-resistant products.

The special INA coating Corrotect^® is an economical alternative to conventional corrosion-resistant radial insert ball bearings. The coating thickness is between 2 μm and 5 μm.

• Anti-rust protection on all sides, including the machined surfaces of chamfers and radii
• Long term prevention of rust penetration beneath seals
• Small bright spots are protected against corrosion by the cathodic protection mechanism
• Anti-corrosion protection allows a significantly longer operating life compared to uncoated parts
• Uncoated bearings and housings are fully interchangeable with the coated versions of the same design
• Bearings and housings made from corrosion-resistant rolling bearing steel are often no longer required.

For further information on Corrotect^® see also section link.

At high temperatures, rolling bearings expand in volume due to a change in the material microstructure. Depending on the location of the heat source, there may also be a significant temperature difference between the inner and outer ring.

The radial insert ball bearings have cages made from metal or a high temperature plastic, increased radial internal clearance, lubricants with improved thermal resistance and special seals.

These bearings have the suffix FA164 or FA101, see table and table. An extended temperature range can be covered by using the series GLE..-KRR-B and GE..-KLL-B, see table.

These “classic” INA radial insert ball bearings are located on the shaft by means of a locking collar, Figure 1. They are particularly suitable for bearing arrangements with a constant direction of rotation or, under low speed and load, for an alternating direction of rotation.

The locking collar is preferably tightened in the direction of rotation and secured by means of a grub screw. This location method prevents damage to the shaft and can be easily loosened again.

The radial insert ball bearings are fitted with P, R, L or T type seals . In series GE..-KRR-B-2C, the R seals  are fitted with Corrotect^®-coated flinger shields to protect against mechanical damage.

With the exception of a few series, sealed bearings can be relubricated.

Several series are also available in a corrosion-resistant design. These bearings have the suffix FA125.

The inner rings up to d = 60 mm, as well as locking collars in general, have a Corrotect^® coating and are thus protected against fretting corrosion; the exception is the series RALE..-NPP(-B).

The series for high or expanded temperature ranges have the suffix FA164 or FA101, see table.

In addition to the bearings with a spherical outer ring, there are also the following series with a cylindrical outer ring: RAE..-NPP, RALE..-NPP, E..-KRR and E..-KLL.

The series GRA..-NPP-B-AS2/V, RA..-NPP-B, G..-KRR-B-AS2/V, RA..-NPP, RAL..-NPP

Tightening torques for metric and inch size grub screws, see table.

In these radial insert ball bearings, the inner ring is located on the shaft by means of two grub screws offset by 120°, Figure 2. This location method is suitable for bearing arrangements with a constant direction of rotation or, under low speed and load, for an alternating direction of rotation.

The grub screws are self-retaining and have a fine pitch thread with cup point for secure location of the bearings.

The radial insert ball bearings are fitted on both sides with P or R type seals .

With the exception of series AY..-NPP-B, the bearings can be relubricated.

These bearings have the suffix VA. In this design, the bearing rings and rolling elements are made from high alloy, corrosion-resistant rolling bearing steel with an increased chromium molybdenum content and the steel cages are made from corrosion-resistant steel. The bearings are sealed on both sides with RSR seals and have additional flinger shields made from corrosion-resistant steel, see also TPI 64, Corrosion-resistant products.

The radial insert ball bearings for high temperatures have the suffix FA164, see table.

In the case of series GY..-KRR-B-AS2/V, the bore is an inch size bore, see dimension table, link.

Tightening torques for metric and imperial grub screws, see table.

In this series, the inner ring is located on the shaft by an adapter sleeve with a locknut and a tab washer, Figure 3.

The adapter sleeve and locknut give concentric, force locking location of the bearing inner ring on the shaft. As a result, the speeds that can be achieved are the same as with deep groove ball bearings. These bearings also give quieter running than normal radial insert ball bearings. The adapter sleeve, locknut and tab washer are all zinc-coated.

Due to the integral adapter sleeve, the bearings have the same radial dimensions and basic load ratings as radial insert ball bearings with an eccentric locking collar or with grub screws in the inner ring and are interchangeable with these bearings.

Radial insert ball bearings with integral adapter sleeve are sealed by means of RSR seals .

The bearings can be relubricated.

See table.

Radial insert ball bearings with a drive slot in the inner ring are non-locating bearings with good high temperature characteristics, Figure 4. Non-locating bearings are used at low speeds and loads to compensate for thermal elongation of the shaft.

Due to the slot, they are easy to locate in a radial direction. Rotation is prevented by a drive pin on the shaft or a set collar with a pin. The non-locating bearings are suitable for drawn shafts up to grade h7.

Inner rings up to a bore diameter 60 mm have a Corrotect^® coating and are thus protected against fretting corrosion.

Radial insert ball bearings with a drive slot have R type seals  with Teflon seal lips.

The bearings can be relubricated.

Self-aligning deep groove ball bearings area available with a cylindrical bore for a fit seat, Figure 5 or with a reamed square or hexagonal bore, Figure 6.

Bearings with a fit on the shaft allow speeds equivalent to those of standard ball bearings, are suitable for bearing arrangements with an alternating direction of rotation and offer smooth running.

The bearings are sealed on both sides using P type seals with a vulcanised seal lip or three-piece designs.

For self-aligning deep groove ball bearings with a fit seat, the fit data for ball bearings apply.

Bearings with a profiled bore are used where shafts must transmit very high torques and this is only possible using square or hexagonal shafts, Figure 6. Rotation is prevented by the geometrical locking effect.

The bearings have a Corrotect^® coating.

Self-aligning deep groove ball bearings are sealed using R or T type seals .

The bearings are greased to their maximum, some designs can be relubricated.

These bearings have a cylindrical outer ring and are fitted in cylindrical bores, Figure 7. The inner ring is extended on both sides and is located on the shaft using a location fit. Due to the extended inner ring, additional axial spacer rings are not required.

The concentric seat allows speeds equivalent to those of standard ball bearings, while the load can be either constant or alternating. Smooth running is also achieved.

The tolerance of the inner ring bore corresponds to tolerance class PN in accordance with DIN 620.

The bearings are sealed on both sides using R type seals .

The sheet steel washers extended outwards and angled downwards form a large grease reservoir.

These bearings are based on radial insert ball bearings with an eccentric locking collar or on self-aligning deep groove ball bearings, but additionally have an axially split outer ring as an aligning ring, Figure 8. They are mounted in cylindrical bores and can compensate for static misalignment of the shaft up to ±5°.

Due to the annular slots in the outer ring to DIN 616, they are highly suitable for sheet metal constructions. In this case, they are axially located using snap rings to DIN 5 417.

In series PE, the inner ring is located on the shaft using a locking collar, in series BE by a location fit.

The aligning ring has a Corrotect^® coating and is thus protected against fretting corrosion. In series PE, the inner ring and locking collar are also coated.

The bearings are sealed on both sides using P type seals .

Radial insert ball bearings with an aligning ring cannot be relubricated.

The fit tolerances of the aligning rings are those of the deep groove ball bearings. Select the fit for the shaft and housing such that the outer ring of the insert bearing can undergo self-alignment.

The basic design of series RAE..-NPP-NR is a radial insert ball bearing with an eccentric locking collar and an inner ring extended on one side, Figure 9. The outer ring has a cylindrical outside surface and two slots to DIN 616. The bearings are fitted in cylindrical bores and axially located by easy-to-fit snap rings. The bearing is supplied with one snap ring to DIN 5 417 already fitted.

The bearings are sealed on both sides using P type seals .

The radial insert ball bearings are greased and cannot be relubricated.

These radial insert ball bearings are located on the shaft using an eccentric locking collar. The outer ring is encased in a thick-walled NBR interliner, Figure 10.

The interliner absorbs vibrations and shocks and thus gives damping of running noises.

The interliners have a spherical or cylindrical outside surface.

For roll bearing arrangements, one series has a locating shoulder on the rubber ring.

The inner ring and locking collar have a Corrotect^® coating and are thus protected against fretting corrosion; the exception is the series with radial insert ball bearings RALE..-NPP(-B).

The radial insert ball bearings are sealed on both sides using P type seals .

Bearings with rubber interliners cannot be lubricated.

Note the tube and housing diameters for radial insert ball bearings with rubber interliner:

• CRB, tube inside diameter D –0,6 to 1,6
• RABR, RCR, RCSM, housing diameter D –0,25 to –0,35.

Seals for radial insert ball bearings are of a three-piece design. This concept offers, due to the rigidly rolled-in sheet steel washer, optimum seating in the bearing as well as concentric alignment of the seal lip to the inner ring.

Suffixes for available designs: see table.