Solid Needle Roller Bearing with Flange and Inner Ring (NKI, NA 49/69 Series)

Specifications

How to choose Needle roller bearings

Points to check when selecting, with the values for this product (Solid Needle Roller Bearing with Flange and Inner Ring (NKI, NA 49/69 Series)).

1. 1. Select dimensions by shaft diameter and presence of inner ring

   Types without an inner ring use the shaft directly as the raceway, so the roller pitch circle diameter Fw corresponds to the applicable shaft diameter. In this case the shaft requires sufficient hardness and surface finish. If the shaft cannot serve as the raceway, select a type with an inner ring and match the shaft diameter using the bore diameter d.

2. 2. Check housing dimensions by outside diameter and width

   This product: Outer diameter D 42〜480 mm

   The outside diameter D determines the housing bore diameter, and the width C determines the axial installation space. Shell types have thin walls and allow a smaller outside diameter, but they are retained by press fit, so the housing bore tolerance and rigidity must be verified.

3. 3. Verify life and static strength with rated loads

   This product: Basic dynamic load rating Cr 20.6〜968 kN

   The basic dynamic load rating Cr is used for calculating rolling fatigue life, and the basic static load rating C0r is used for examining permanent deformation under shock loads or stationary loads. The listed Cr values range widely from 1.23 to 13200 kN, and are larger for double-row types and larger diameters.

4. 4. Choose the type suited to the application

   Select shell types for space savings and solid types for high load and high rigidity. Select self-aligning types where shaft tilt is present, combined types with thrust bearings for fixed-side positions that also carry axial load, and cam followers for applications rolling along cams or rails.

5. 5. Match rotational speed with lubrication method

   The limiting speed varies with the lubrication method, and generally oil lubrication allows higher speeds than grease lubrication. Confirm that the operating speed is below the limiting speed for each lubrication condition.

6. 6. Consider sealing and operating environment

   In environments where foreign matter or moisture may enter, selecting contact-seal types such as RS or 2RS, or grease-packed types, helps retain lubricant and reduces relubrication effort. However, the seal increases rotational resistance and imposes limits on operating temperature, so these points should be considered.

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

About Needle roller bearings and all products

Description

Flanged solid needle roller bearings with inner ring. Wide range of bore diameters from 30 mm to 380 mm and multiple cross-section designs, including NKI, NA 49, NA 69 and NKIS. Basic dynamic load rating, fatigue load limit, reference speed and mass are listed for each bore diameter range.

FAQ

Q. From what bore diameter to what bore diameter can I select SKF flanged needle roller bearings of the NKI, NA 49/69 series?

A. Sizes with bore diameters of 30 to 380 mm are available. The outside diameter ranges from 42 to 480 mm.

Q. Are sealed types available for NA 49 series needle roller bearings?

A. Sealed types (RS, 2RS) are available for the NA 49 series.

Q. What is the range of basic dynamic load rating and basic static load rating for the NKI, NA 49/69 series?

A. Basic dynamic load rating Cr is 20.6 to 968 kN, and basic static load rating C0r is 27.5 to 3000 kN.

Q. What cross-section designs are included in the NKI, NA 49/69 series?

A. Multiple cross-section designs are included, such as NKI, NA 49, NA 69 and NKIS. They have an inner ring, and basic load ratings, fatigue load limit, reference speed and mass are listed for each bore diameter range.

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 91
  Found on: https://azuma-eg.com/catalogue/