Support rollers

JFK rolling bearings

High radial load capacity
With or without axial guidance
Available seals

JFK needle roller track rollers are guidance units for applications on tracks, cams, and linear motion systems with high radial loads. Compared to ball cam rollers, they offer higher radial load capacity thanks to the line contact between rollers and raceways. The range is divided into two families based on the presence or absence of axial guidance: versions with axial guidance (NATR, NATV, NUTR) can withstand axial forces caused by lateral misalignment, while versions without axial guidance (STO, RSTO, NA22) require external guide surfaces and are suitable for flat tracks.

Each JFK support roller is supplied lubricated with lithium-based grease (–30°C/+110°C) and equipped with integrated seals for protection against contaminants. They are available with cylindrical or crowned outer rings depending on the series and application.

Versions

How to choose the right support roller

The main consideration is whether or not an axial guidance is needed. Models with an axial guide are more versatile; those without are more compact and better suited for flat tracks.

Support rollers with axial guide
NATR, NATV, NUTR series. Equipped with lateral flanges on the outer ring acting as axial guides, supporting axial forces caused by lateral misalignment between the roller and the track. Suitable for V- or U-shaped tracks. Supplied with integrated seals and lithium-based grease as standard. NATR · NATV · NUTR · Integrated axial guide · V- or U-shaped guides
Support rollers without axial guide
STO, RSTO, NA22 series. Cylindrical outer ring without lateral flanges. They require external guide surfaces for axial constraint. The RSTO series features a crowned outer ring surface to compensate for alignment errors. Suitable for flat tracks. Supplied with integrated seals and lithium-based grease as standard. STO · RSTO · NA22 · Without axial guide · Flat tracks

Performances

Design and performance features

Linear contact between rollers and raceways for high radial load capacity on tracks and cams, with or without integrated axial guidance.

Benefit

Speed

Low and medium rotational speeds Suitable for low and medium speeds, typical of applications involving industrial guides and cams.

Benefit

Lubrication

Lithium-based grease · –30°C/+110°C Supplied lubricated with lithium-based grease as standard, suitable for temperatures ranging from –30°C to +110°C. The integrated seals protect the grease from contaminants and extend its service life.

Benefit

Load

The linear contact between rollers and raceways ensures higher radial load capacity compared to ball track rollers. Suitable for applications with significant radial loads on guides and cams.

Benefit

Axial guidance

With or without, depending on the series The NATR/NATV/NUTR series include lateral flanges for axial guidance, while the STO/RSTO/NA22 series require external axial guidance. The choice of series depends on the track design and the possible presence of lateral misalignment.

Benefit

Seal

Integrated seals Equipped with integrated seals to protect against dust, dirt, and moisture. They help retain the lubricating grease and extend the service life without the need for relubrication.

Benefit

Outer ring

Cylindrical or crowned Cylindrical outer ring available for most series. The RSTO series features a crowned outer ring to compensate for alignment errors between the roller and the track.

Mounting

Mounting of support rollers

Needle roller track rollers are mounted on the stud or support shaft. For versions with axial guidance, check that the track profile is compatible with the lateral flanges of the outer ring. Lubrication is ensured by the lithium-based grease supplied as standard; relubrication is not required under normal operating conditions.

Installation Mounting

Mounting on a fixed studThe track roller is mounted on a fixed stud secured to the structure. The outer ring rotates freely while the stud remains stationary. Check the fitting tolerances between the inner bore and the stud.
Versions with axial guide (NATR/NATV/NUTR)Check that the track profile is compatible with the lateral flanges of the outer ring. The flanges provide the axial guidance of the roller on the track.
Versions without axial guide (STO/RSTO/NA22)They require external track surfaces for axial constraint. The RSTO series, with its crowned outer ring, automatically compensates for small lateral alignment errors.

Technical data

Speed: Low and medium rotational speeds
Lubrication: Lithium-based grease · –30°C/+110°C
Axial guidance: With or without, depending on the series
Seal: Integrated seals
Outer ring: Cylindrical or crowned

Applications

Components and application support for every industrial environment.

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JFK rolling bearings

Contacts

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Related products

Please also consider these alternatives: For applications on guides and cams requiring a ready-to-install unit with a threaded stud for direct mounting to the structure. For guide applications requiring higher speeds with moderate loads, ball track rollers offer lower friction compared to needle roller track rollers. For applications where the track roller does not run on a guide but supports a rotating shaft with high radial loads in a compact design.