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Cylindrical Roller Bearings

Overview

Cylindrical roller bearings (CRBs) have a simple structure with their cylindrical rollers in linear contact with the raceways. They offer high load capacity under primarily radial loads. Low friction between the rollers and ring ribs makes these bearings suited for high speed rotation.

Cylindrical Roller Bearings

Single-row bearings are designated as NU, NJ, NUP, N, or NF, while double-row bearings are designated as NNU or NN, depending on if side ribs are used. All types allow the inner and outer rings to be separated.

Some CRBs used as free-end bearings have no ribs so that the rings can move axially relative to each other. When the inner or outer ring has ribs on both sides and the other ring has a rib on one side, these bearings can take some axial load in one direction.

Double-row cylindrical roller bearings have high radial rigidity and are used primarily for the main shafts of precision machine tools. Cages are typically made of pressed steel or machined brass, but molded polyamide resin cages are used for some models.

NSK offers a wide variety of CRBs to suit your needs:

Cylindrical Roller Bearing Types

NU, N, NNU, NN: Suitable as free-end bearings.

NJ, NF: Can sustain limited axial loads in one direction.

NH, NUP: Suitable as fixed-end bearings. NH types are comprised of a NJ-type CRB with a HJ-type L-shaped thrust collar.

CAD

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Product List

Cylindrical Roller Bearings (Pressed Steel Cages)

Cylindrical Roller Bearings (Pressed Steel Cages)

Cylindrical Roller Bearings (Pressed Steel Cages)

The EW Series features high load capacity with a high-performance pressed steel cage, suitable for a wide variety of industrial applications.

Cylindrical Roller Bearings (Machined Brass Cages)

Cylindrical Roller Bearings (Machined Brass Cages)

Cylindrical Roller Bearings (Machined Brass Cages)

The EM Series features high load capacity with a machined one-piece cage, suitable for all kinds of industrial applications.

Cylindrical Roller Bearings (Polyamide Resin Cages)

Cylindrical Roller Bearings (Polyamide Resin Cages)

ET Series high load capacity bearings with polyamide resin cages support continuous operation at temperatures ranging from -40 to 120 °C. Please contact NSK for operation at temperatures of 100 °C or higher in environments with gear oils, flame-resistant hydraulic oils, or synthetic ester-based oils.

Full-Complement Cylindrical Roller Bearings

Full-Complement Cylindrical Roller Bearings

Full-Complement Cylindrical Roller Bearings

Full-complement cylindrical roller bearings have no cage to allow the maximum number of rollers possible, greatly increasing load capacity. However, this makes their high-speed performance a bit worse than bearings with cages.

Open single- and double-row types are mainly used in general industrial machinery with low speeds and high loads. Shielded double-row types are used primarily for crane sheaves.

Cylindrical Roller Bearings for Sheaves

Cylindrical Roller Bearings for Sheaves

Cylindrical Roller Bearings for Sheaves

Specially designed for the tough environments facing crane sheaves, these bearings offer excellent durability and resistance to outdoor elements. Easy to assemble and relubricate, CRBs for sheaves are designed with maintenance in mind.

Features

  1. Excellent sealing
    Contact seals significantly reduce the entry of water and foreign matter.
  2. High load capacity
    These bearings can take the significant radial and thrust loads present in crane sheaves.
  3. Corrosion-resistant
    A phosphate coating improves resistance to rust and corrosion.
  4. Easy grease replenishment
    Lubrication holes supplied in the inner ring allow for grease in sealed types to be easily refilled and replaced.
  5. Fewer mounting parts
    Equipped with a locating snap ring, these bearings reduce the number of surrounding components, allowing for a more economical sheave structure.

FAQ

  • How are the functions of ball bearings and roller bearings different?
    • Ball bearings are ideal for high-speed rotation, while roller bearings are more suited for high loads.
  • Do cylindrical roller bearings come with seals?
    • Because cylindrical roller bearings have separable inner and outer rings, they generally do not come with seals (open specification). As such, please apply seals or other protection around the equipment mounting.
  • How are the EW, EM, and ET Series different?
    • EW Series bearings are small and utilize a pressed cage, making them suitable for standard operating conditions. ET Series bearings use a polyamide-resin cage suited for high temperatures. Finally, EM Series bearings have machined cages for use in harsh conditions such as gearboxes or vibrating machinery or in applications where the bearing must be quiet, such as in mid-to-large size motors.

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