Solid Drawn Cup Needle Roller Bearing with Flange, Without Inner Ring

Specifications

How to choose Needle roller bearings

Points to check when selecting, with the values for this product (Solid Drawn Cup Needle Roller Bearing with Flange, Without Inner Ring).

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

   This product: Roller pitch circle diameter Fw 18 〜 415 mm

   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 24 〜 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

   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

   This product: Limiting speed 900 〜 17 000 r/min

   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 needle roller bearing without inner ring, using the shaft itself as the inner raceway. Series include NK, NKS, RNA 49 and RNA 69, with basic dynamic load rating, limiting speed and mass listed for each nominal diameter. Sealed types with RS and 2RS seals are available, and dimensions of compatible seals are also provided.

FAQ

Q. Within which size range can SKF solid drawn cup needle roller bearings without inner ring (NK / NKS / RNA 49 / RNA 69 series) be selected?

A. Roller pitch circle diameter Fw ranges from 18 to 415 mm, outer diameter D from 24 to 480 mm, and width C from 16 to 100 mm.

Q. Can SKF needle roller bearings without inner ring be used for axial positioning?

A. Yes, because they have a flange, they enable axial positioning.

Q. How is the shaft used with SKF needle roller bearings without inner ring?

A. The design uses the shaft itself as the inner raceway.

Q. Are sealed types available for SKF needle roller bearings without inner ring?

A. Yes, sealed types with RS and 2RS seals are available, and dimensions of compatible seals are also listed.

Q. What is the limiting speed of SKF needle roller bearings without inner ring?

A. The limiting speed is 900 to 17 000 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 75
  Found on: https://azuma-eg.com/catalogue/