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Needle Roller

RN（針状ころ） / SKF (Official website) / Listed on page 123 of the document

Needle rollers with diameters of 1 to 6 mm. Dimensions and mass by roller length are listed in a table.

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Needle Roller on page 123 of SKF "針状ころ軸受 (SKF 製品カタログ・技術資料抜粋)"
Source: SKF「針状ころ軸受 (SKF 製品カタログ・技術資料抜粋)」page 123
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Specifications

Roller diameter Dw 1～6 mm
Roller length Lw 5.8～39.8 mm
Mass 0.048～6.15 g

How to choose Needle roller bearings

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

  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

Lists roller diameter Dw and roller length Lw, chamfer dimensions r1,2, r1, r2, and mass. Designation format: RN-Dw x Lw BF/G2.

FAQ

Q. What is the designation format for needle rollers?
A. The designation format is RN-Dw x Lw BF/G2.
Q. What are the ranges of roller diameter Dw and roller length Lw for needle rollers (RN series)?
A. Roller diameter Dw ranges from 1 to 6 mm, and roller length Lw ranges from 5.8 to 39.8 mm.
Q. What is the mass of needle rollers (RN series)?
A. The mass ranges from 0.048 to 6.15 g.
Q. Which dimensions and mass are listed for needle rollers (RN series)?
A. Roller diameter Dw, roller length Lw, chamfer dimensions r1,2, r1, r2, and mass are listed. Dimensions and mass by length are shown in a table.

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

Source documents

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