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Solid Needle Roller Bearings (with Flange and without Flange)

NK / NKS / RNA 48 / RNA 49 / RNA 69 / NA 69 / SKF (Official website)

Low-section, high-load-capacity needle roller bearings made of carbon chromium bearing steel. Available with and without flange, and selectable with or without inner ring.

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How to choose Needle roller bearings

Points to check when selecting, with the values for this product (Solid Needle Roller Bearings (with Flange and without Flange)).

  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

    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

    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

The outer ring is available with a flange (NK, NKS, etc.) or without a flange (RNA series). Flangeless types allow the outer ring, needle roller and cage assembly, and inner ring to be mounted separately. Large flanged bearings are provided with oil grooves and oil holes.

Features

  • Made of carbon chromium bearing steel
  • Low section height and high load capacity
  • Selectable with or without flange, and with or without inner ring
  • Sealed variations available

Applications

  • Compact bearing assemblies
  • Shaft areas where increased bearing rigidity is required

FAQ

Q. For Solid Needle Roller Bearings NK / NKS / RNA 48 / RNA 49 / RNA 69 / NA 69, can I choose between flanged and flangeless types?
A. Yes. The outer ring is available with a flange (NK, NKS, etc.) or without a flange (RNA series). Flangeless types allow the outer ring, needle roller and cage assembly, and inner ring to be mounted separately.
Q. What are the features of Solid Needle Roller Bearings NK / NKS / RNA 48 / RNA 49 / RNA 69 / NA 69?
A. They are made of carbon chromium bearing steel and have low section height and high load capacity. Selectable with or without flange, and with or without inner ring, and sealed variations are also available.
Q. What applications are Solid Needle Roller Bearings NK / NKS / RNA 48 / RNA 49 / RNA 69 / NA 69 suited for?
A. They are used in compact bearing assemblies and in shaft areas where increased bearing rigidity is required.
Q. Do the large flanged bearings of Solid Needle Roller Bearings NK / NKS / RNA 48 / RNA 49 / RNA 69 / NA 69 have a lubrication structure?
A. Yes. Large flanged bearings are provided with oil grooves and oil holes.

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

Source documents

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