NK / NKI series
Product type
JFK Needle Roller Bearings
Needle roller bearings are rolling bearings that use needle rollers (long rollers with a small diameter) as rolling elements, providing high radial load capacity with a minimum cross-section. Thanks to their reduced radial dimensions and high number of rolling elements, a needle roller bearing can withstand significantly higher loads than a ball bearing with the same bore diameter.
JFK needle roller bearings cover the complete range (NK/NKI, cages, drawn cup bearings, IR inner rings, combined bearings, cam followers and support rollers) for compact high-load applications: from bearings with stamped rings to thin-walled drawn cup bearings, from cages for crank applications to ready-to-mount stud-type track rollers.
Each product is selected for its verified quality, and is accompanied by consistent availability and technical support at every stage of the project.
Not sure which type is the right choice for you? The "Selection guide" section at the bottom of this page will help you identify the best solution for your application. Alternatively, contact us directly for technical assistance.
JFK needle roller bearings cover the complete range (NK/NKI, cages, drawn cup bearings, IR inner rings, combined bearings, cam followers and support rollers) for compact high-load applications: from bearings with stamped rings to thin-walled drawn cup bearings, from cages for crank applications to ready-to-mount stud-type track rollers.
Each product is selected for its verified quality, and is accompanied by consistent availability and technical support at every stage of the project.
Not sure which type is the right choice for you? The "Selection guide" section at the bottom of this page will help you identify the best solution for your application. Alternatively, contact us directly for technical assistance.
Find the product
A complete range for every motion requirement
The seven product types in this range differ in design, presence or absence of an inner ring, axial guidance, and application field. NK/NKI needle roller bearings are the primary choice for high radial loads in limited spaces. Needle roller cages provide the most compact and cost-effective solution when the shaft and housing act as raceways. Drawn cup needle roller bearings combine a thin cross-section with simple mounting. The IR inner ring is designed for use with needle roller bearings without an inner ring, such as the NK series, providing the required running surface and allowing use on untreated shafts. Cam followers are ready-to-mount units for guide and cam applications. Support rollers complete the range for guide applications with or without axial guidance.
JFK K – KBK – KZK needle roller cages
The simplest design in the category: rollers retained only by the cage, without rings. They operate directly on the shaft and housing surfaces, which must be hardened and ground. The ideal solution…
JFK Drawn Cup Needle Roller Bearings
Stamped steel outer ring with integrated roller and cage assembly. Available open on both sides (HK) or closed on one side (BK) for end-of-shaft support. Supplied with lithium-based grease as standard, suitable…
JFK IR inner rings
Separate inner ring for needle roller bearings without an inner ring. It eliminates the need for shaft hardening, simplifies maintenance, and improves seal efficiency. Available in larger widths for applications with high…
JFK Combined needle roller bearings
Radial and axial loads · Bidirectional · Zero axial clearance Units integrating a radial needle roller cage and one or two axial cylindrical roller cages in a single component. Combined bearings support radial forces, bidirectional axial loads, and tilting moments. Available in…
JFK cam followers
Ready-to-mount · Quick fixing with hexagonal nut · Eccentric collar available Stud-type needle roller units with threaded stud, non-separable and ready to mount. Outer ring available with cylindrical or spherical outer surface. Three series are available: CF/KR with cage, CF_V/KRV full complement versions,…
Support rollers
High radial loads · With or without axial guidance · Seals available Support rollers for guide, cam, and linear motion applications. Versions with axial guidance (NATR, NATV, NUTR) support axial forces caused by misalignment; versions without axial guidance (STO, RSTO, NA22) require external guiding…SELECTION GUIDE
Start by identifying the operating conditions
JFK needle roller bearings cover a wide range of applications: from limited radial spaces to very high loads, from guide systems to crank applications. Start from the operating condition that best describes your case.
Limited radial space, high load capacity
When radial space is the primary constraint but load capacity cannot be compromised, NK/NKI needle roller bearings are the ideal solution. The NK version has no inner ring and runs directly on a hardened and ground shaft; the NKI version includes an inner ring and can also be used on unhardened shafts. Minimal space required, cost-effective solution
When space is the critical parameter and shaft and housing surfaces can be hardened and ground, needle roller cages offer the most compact and cost-effective solution available Guide or cam systems
Cam followers are the ideal choice when a ready-to-mount unit is required for movement on guides or interaction with cams. The NUKR series is designed for very high radial loads, CF/KR for higher speeds, and CF_V/KRV for the maximum number of rolling elements. Simultaneous radial and axial loads
When the component must simultaneously handle radial forces, bidirectional axial loads, and tilting moments, combined bearings provide all-in-one functionality in a single compact element, pre-set with zero axial clearance.Contacts
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