Full-complement single-row cylindrical roller bearings

Jednořadá válečková ložiska s plným počtem válečků
Cageless, full-complement cylindrical roller bearings have the maximum possible number of rollers and can sustain much heavier loads than cylindrical roller bearings of the same size with cages. On the other hand, their high-speed capability is inferior to that of bearings with cages.
NCF type
Two ribs on the inner ring and one rib on the outer ring. The outer and inner rings and rollers are non-separable since a retaining snap ring is installed on the side opposite the outer ring rib. They can sustain axial loads in only one direction.
NJK type
One rib on the inner ring, two ribs on the outer ring and a non-separable set of rollers.
The outer ring with the full number of rollers can be separated from the inner ring without the need to secure the rollers against falling out. This simplifies assembly and disassembly.
Bearing series: NCF…, NJK…


NSK has introduced a range of full-complement cylindrical roller bearings for highly demanding steel industry  applications. NUB series bearings are designed to be particularly effective when used on the non-driven side of strand guide rolls; for example, in the straightening section of continuous casting machines.
Located directly after the bending process, the straightening section of continuous casting machines facilitates transition to the roller tables for cooling newly-cast metal slabs before moving them along for additional processing. The clear principle of a continuous casting machine is to ‘keep moving’ so that yield, productivity and cost-efficiency can all be maximised. With this in mind, the conveyor keeps driving the strand forward, day-in, day-out, which is why the bearings are so process-critical.
Challenging environmental conditions are prevalent in steel industry applications such as these. For instance, not only are the bearings subjected to elevated mechanical stress, but they must be able to cope with cooling water in both liquid and mist form. In addition, the very low speeds (less than 10 rpm) of the roller table drives can be problematic for traditional spherical roller bearings as their design imposes very demanding lubrication requirements. Increased wear on rolling parts can be expected when speeds drop below a certain threshold.
Despite these challenges, steel plants demand long service life with no unplanned downtime and minimal maintenance costs, which is why NSK launched into developing its NUB series of cageless cylindrical roller bearings. To help maximise service life, the characteristics of these bearings include low friction and excellent rolling contact self-alignment. It is possible to compensate for any thermal expansion of the strand guide rolls, as misalignments as large as 12 angular minutes have no effect on the successful operation or service life of NUB series bearings.
In contrast to conventional spherical roller bearings, pure rolling friction occurs in NUB bearings thanks to predominant line contact in the raceway. Friction is therefore low and wear is reduced. Straightforward installation is another benefit whereby a simple snap-ring is used to attach the inner ring.
Compared with the previous product series, NSK’s NUB series bearings are able to treble service life, even when faced with the demanding environmental conditions of strand guide rolls in continuous casting machines. For this reason, the bearings help facilitate cost-effective, continuous and highly productive steel manufacturing.

More details in the catalogue:

Jednořadá válečková ložiska s plným počtem válečků / Válečková jednořadá ložiska s plným počtem válečků - Full complement CRB
We are ready to answer your questions.

Leaders in our industry

We strive to offer you the technically optimal solution in the shortest possible time. We save you costs and we are here for you 24 hours a day, 7 days a week, 365 days a year.
Coroll - výhody

Stock value of more than 3.5 million EUR

Our stock range is built according to the specific needs of our customers and market requirements, so we always deliver on time.
Coroll - výhody

Deliveries from the warehouse within 24 hours

We modify (cut and finish) and deliver linear guides for MRO within 24 hours.

Coroll - výhody

25 years of experience

You can rely on our specialist technical knowledge and skills.
Coroll - výhody

Professional technical support

Our experienced technical team is always on-hand for customer queries and support.
Coroll - výhody

Product quality and origin guarantee

Because we cooperate with world-leading manufacturers, we are always able to document the origin of our stock, guarantee quality and guarantee its parameters.

Coroll - výhody

Emergency service 24/7

We provide our contracted customers with a 24/7 delivery service.

That's not all...

There are so many reasons to start a partnership with us.
Take a look
Coroll represents the largest manufacturers