rail transport l components

Insulated bearings with PPS coating

To prevent electrical damage to the bearing, NSK has developed insulated bearings with a special ceramic or PPS coating on the surface of the outer ring.

Insulated bearings have high insulation resistance and high resistance to damage.

The insulation resistance of these bearings

is not reduced, even at 110 °C.

Traction motors use insulated roller and

ball bearings.

Bearings with an insulated surface are

provided in standard dimensions, no special preparation of the opening is therefore required for their installation.

Insulated bearings with ceramic coating

wear-resistant design and a higher number of rollers.

The high strength of the cage provides

excellent performance in vibrating equipment. The service life of these bearings is

RCT bearings for rail vehicle axles

Gearbox bearings

Bearings for rail vehicle axles


They have to meet a very wide range of

requirements. These include a combination of different loads - high static and dynamic radial loads, radial impact loads,

and axial loads. In addition, the axle plays

a critical role in railway safety, therefore

regular inspections must be carried out

including dismantling, inspecting, maintaining, and reassembling the components.

A reliable and simple disassembly and reassembly procedure is therefore another

important factor.

Tapered roller bearings, roller bearings,

and spherical roller bearings are used in

the axles of rail vehicles based on the benefits of each type.

To improve operational efficiency, axle

bearings must also provide longer inspection intervals. Based on all of these requirements, satisfactory solutions have been


6 types of NSK axle bearings

• RCT bearings (sealed tapered roller

bearings with end cover)

• RCC bearings (sealed roller bearings

with end cover)

• Spherical roller bearings

• Roller bearings combined

with ball bearings

• Roller bearings with ribs

• Tapered roller bearings


These have to withstand high loads and

high speeds and it is essential that they are

highly resistant to rolling motion, impacts,

and extreme temperatures. Therefore, rolling bearings with robust cages are most

often used.

• Roller bearings

• Tapered roller bearings

• Four-point bearings

• Angular contact ball bearings

• Large single row ball bearings

NSK EM series roller bearings

up to twice as long as standard roller bearings. The main application areas of EM

roller bearings include gearboxes, papermaking machines, and steelworks operations.

NSK's facilities are fully utilized by its

authorized distributors around the

world. The Czech company Coroll has

been using them since its foundation in

1995, when it started presenting NSK

products on the Czech market. Corrol

has been using the professional support

of this top manufacturer for more than

20 years; it regularly participates in training programs and in 2019 received the

AIP certificate - the highest possible certification for an NSK distributor. It is the

first and only AIP partner of NSK in the

Czech Republic.



NSK tapered roller bearings

NSK EM series roller bearings


Bearings for very demanding operations

provide an innovated internal structure of

the bearings which guarantees a high load

capacity, strength, quiet operation, and

extended service life. These bearings have

a one-piece robust brass cage of special