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What is a cylindrical roller bearing? How to accurately measure its dimensions

1. What is a Cylindrical Roller Bearing?

A cylindrical roller bearing is an industrial bearing that uses cylindrical rollers instead of balls to support loads. This design allows for higher radial load capacity, reduced friction, and extended service life under heavy-load conditions.

1.1. Structure of Cylindrical Roller Bearings

A cylindrical roller bearing typically consists of the following main components:

Structure of Cylindrical Roller Bearings

  • Inner and Outer Rings: Hold the rollers in place and guide rotational movement.

  • Cylindrical Rollers: Precision rollers that distribute radial loads evenly.

  • Ribs: Guide the rollers and support axial loads when applicable.

  • Cage: Made of steel, brass, or polyamide; helps retain rollers in position and reduce friction.

1.2. Applications of Cylindrical Roller Bearings

These bearings are widely used in industries requiring high load capacity and high-speed rotation, such as:

  • Machinery manufacturing: Gearboxes, industrial motors, CNC spindles

  • Steel and cement industries: Kilns, presses, and heavy-duty conveyors

  • Power generation: Wind turbines, industrial compressors

  • Mining: Crushers, vibrating screens, and large conveyor systems

Cylindrical roller bearings used in rice husk pellet machines.

2. Types of Cylindrical Roller Bearings

There are various cylindrical roller bearing types, each designed for specific applications. Common types include:

2.1. Single Row Cylindrical Roller Bearings

  • Simple structure with one row of rollers

  • High radial load capacity and high-speed capability

  • Common designations: NU, NJ, N, NUP

  • Examples: NU2205, NJ2310

2.2. Double Row Cylindrical Roller Bearings

  • Two rows of rollers for increased load capacity

  • Suitable for heavy-duty machinery such as large motors and industrial gearboxes

  • Common designations: NN, NNU

2.3. Full Complement Cylindrical Roller Bearings

  • No cage; rollers are directly loaded into the bearing, allowing for higher load capacity

  • Common designations: SL01, SL02, SL04

2.4. Self-Aligning Cylindrical Roller Bearings

  • Can accommodate minor shaft misalignments

  • Used in steel mills and heavy-duty pressing machines

3. How to Accurately Measure Cylindrical Roller Bearings

To replace cylindrical roller bearings with the correct size, measure the following key parameters:

3.1. Key Dimensions

  • Inner Diameter (d): The bore that fits the shaft

  • Outer Diameter (D): The outer circle that fits the housing

  • Width (B): Total thickness of the bearing

  • Chamfer Dimension (rmin): Important when installing in rounded or grooved corners

3.2. Measuring Tools

  • Vernier Caliper: For measuring inner/outer diameters and width

  • Feeler Gauge: To check clearance between bearing and shaft

  • Runout Tester: To inspect the bearing’s roundness and rotational precision

3.3. Step-by-Step Measuring Instructions

Cách đo kích thước vòng bi chính xác

Step 1: Prepare the bearing

  • Clean the bearing using a soft cloth and specialized cleaning solution

  • Place it on a flat, stable surface to avoid vibration during measurement

Step 2: Measure the inner diameter (d)

  • Use a caliper to measure at three different points on the inner ring

  • Take the average if variations are detected

Step 3: Measure the outer diameter (D)

  • Measure across the outer edge at three positions

  • If worn or deformed, use a dial gauge for higher precision

Step 4: Measure the bearing width (B)

  • Position the caliper perpendicular to the bearing surface

  • Take measurements at different points and calculate the average

Step 5: Check radial runout (if required)

  • Mount the bearing onto a shaft and rotate slowly

  • Use a dial indicator to detect any abnormal runout

  • If runout exceeds limits, replace the bearing

4. Where to Buy Genuine Cylindrical Roller Bearings?

Kien Thanh Tin is a leading distributor of genuine industrial bearings in Vietnam, especially for factories needing bulk quantities. With years of experience, we are committed to supplying high-quality, authentic bearings at competitive prices.

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