Needle Roller / Thrust Cylindrical Roller Bearing

Specifications

How to choose Rolling Bearings

Points to check when selecting, with the values for this product (Needle Roller / Thrust Cylindrical Roller Bearing).

1. 1. Bore and housing bore dimensions

   This product: Inner diameter d 15〜50 mm

   Select the bore diameter d to match the shaft seat, the outside diameter D to match the housing bore, and the width B to suit the installation space. Main dimensions are standardized in ISO and JIS dimension series, so interchangeable products can be found by boundary dimension designation. For tapered roller bearings, also check the assembled width T; for thrust bearings, also check the height H.

2. 2. Dynamic load rating based on life calculation

   The basic dynamic load rating Cr is the reference value for calculating rated life. Verify that the required life is met using the equivalent load during operation and the rotational speed. For ball bearings, life is proportional to the cube of the load ratio, so providing load margin greatly extends life.

3. 3. Margin for static and shock loads

   The basic static load rating C0r is the allowable standard for permanent deformation generated at the rolling elements and raceways under stationary or low-speed conditions. For applications with oscillating motion or shock loads, confirm that a static safety factor against the maximum load is secured using C0r.

4. 4. Operating speed and lubrication method

   This product: Limiting speed (grease lubrication) 4300〜8500 r/min

   The limiting speed differs by lubrication method, and separate values are given for grease lubrication and oil lubrication. Confirm that the normal operating speed does not exceed the limiting value, and in high-speed ranges also consider cage material and precision grade. The reference speed can also be consulted as a thermal guideline.

5. 5. Precision grade and internal clearance

   Precision grades (P0, P6, P5, etc.) indicate rotational accuracy and dimensional accuracy; for high-precision applications such as machine tool spindles, select higher grades. Internal clearance (C2, CN, C3, etc.) is selected to allow for changes caused by interference fit and temperature differences during operation.

6. 6. Materials and lubrication suited to the environment

   For corrosive, high-temperature, vacuum, or clean environments, select specifications such as rings and rolling elements made of stainless steel or ceramics, or solid lubricants and fluorine grease for vacuum use. Check the operating temperature range, low dust generation, and whether food-grade grease registration applies against the application conditions.

This guide was written by AI based on the listed products' documents and specification items.

About Rolling Bearings and all products

FAQ

Q. What are the bore diameter, outside diameter, and width ranges for the NKXR and NKXR Z series?

A. Bore diameter d is 15 to 50 mm, outside diameter D is 24 to 62 mm, and width B is 23 to 35 mm.

Q. What types of loads can NKXR and NKXR Z bearings support?

A. They are thrust cylindrical roller bearings capable of supporting large axial loads. The bore diameter is 15 to 50 mm.

Q. What is the limiting speed of NKXR and NKXR Z bearings under grease lubrication?

A. The limiting speed under grease lubrication is 4300 to 8500 r/min.

Written by AI based on the content of the source documents.

Source documents

• Catalog 針状ころ軸受 (SKF 製品カタログ・技術資料抜粋) 124 pages Open page 12
  Found on: https://azuma-eg.com/catalogue/