Rolling Bearings
Rolling bearings are machine elements that support shafts with rolling contact between inner and outer rings through balls or rollers (rolling elements), reducing friction. They are classified into ball bearings and roller bearings by rolling element shape, and into radial and thrust bearings by load direction. Representative types include deep groove ball bearings, angular contact ball bearings, cylindrical roller bearings, tapered roller bearings, and spherical roller bearings. Besides general industrial machinery, specifications are available for special environments such as corrosion-resistant food-grade types using stainless steel or ceramics, high-temperature and vacuum types using solid lubricants or fluorine grease, and food machinery types pre-packed with grease, including for semiconductor manufacturing equipment and food machinery.
- Angular Contact Ball Bearings
- Insert Bearings
- Cam Followers
- Tapered Roller Thrust Bearings
- Cylindrical Roller Thrust Bearings
- Thrust Ball Bearings
- Spherical Roller Thrust Bearings
- Track Rollers
- Hub Unit Bearings
- Tapered Roller Bearings
- Cylindrical Roller Bearings
- Slewing Ring Bearings
- Deep Groove Ball Bearings
- Self-aligning ball bearings
- Bearing units
- Needle roller bearings
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Cam Followers
New Standard Cam Follower
Cam follower with special heat treatment of rollers and high-performance grease that improve rolling fatigue life and low-temperature starting torque performance. Interchangeable with conventional products.
NTN Corporation
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Needle roller bearings
Needle Roller Bearing with Thrust Cylindrical Roller Bearing
Model: NKXR
Composite bearing combining needle rollers and a thrust cylindrical roller bearing to accommodate high axial loads. Open end (without cover) type.
NTN Corporation
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Needle roller bearings
Needle Roller Bearing with Thrust Cylindrical Roller Bearing (with Cover)
Model: NKXR‥Z
A combination needle roller bearing for high axial loads, consisting of NKXR with a cover attached.
NTN Corporation
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Needle roller bearings
Needle Roller Bearing with Angular Contact Ball Bearing
Model: NKIA59
Needle roller bearing with an angular contact ball bearing that supports radial load and unidirectional axial load. Dimension series 59.
NTN Corporation
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Needle roller bearings
Needle Roller Bearing with Three-Point Contact Ball Bearing
Model: NKIB59
Needle roller bearing with a three-point contact ball bearing that accepts radial load and axial load in both directions. Dimension series 59.
NTN Corporation
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Needle roller bearings
Needle Roller Bearing with Double Direction Thrust Needle Roller Bearing
Model: AXN
A bearing that accepts radial load and axial load in both directions, equipped with a double direction thrust needle roller bearing.
NTN Corporation
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Needle roller bearings
Needle Roller Bearing with Double-Direction Thrust Cylindrical Roller Bearing
Model: ARN
A composite bearing that supports radial load and axial load in both directions, with greater axial load capacity than the AXN.
NTN Corporation
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Needle roller bearings
Cam Follower
Stud-type needle roller bearing with an outer ring, mounted to the machine body with a stud and rolling along cams or rails. Available in a wide range of sizes from boundary dimension 8 to 180, with technical data including track load capacity and outer ring strength.
NTN Corporation
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Needle roller bearings
Needle Roller Bearing with Cage
Needle roller bearing with a cage that guides the rollers. Small diameter with high load capacity, low friction, suitable for high-speed rotation. Also suitable for oscillating applications.
NTN Corporation
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Needle roller bearings
Full Complement Drawn Cup Needle Roller Bearing
A needle roller bearing without a cage, with a large number of rollers to achieve high load capacity. Suitable for high-load, low-speed, and oscillating applications.
NTN Corporation
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Needle roller bearings
Solid Needle Roller Bearing
Needle roller bearing with a high-rigidity, high-precision outer ring in a single-row structure. Available in a type that uses the shaft directly as the raceway without an inner ring, and a type with an inner ring.
NTN Corporation
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Needle roller bearings
Shell-Type Needle Roller Bearing
Needle roller bearing with cage and thin-walled outer ring (shell). Available in sealed type, heavy-load type, and inch-series variants.
NTN Corporation
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Needle roller bearings
Needle Roller Bearing with Thrust Ball Bearing
Model: NKX
A composite bearing combining needle rollers and a thrust ball bearing, capable of supporting light axial loads. Open-end type without cover.
NTN Corporation
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Needle roller bearings
Needle Roller Bearing with Thrust Ball Bearing (with Cover)
Model: NKX‥Z
A composite needle roller bearing with a cover added to the NKX, designed for light axial loads.
NTN Corporation
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Rolling Bearings
Bearee™ Resin Rolling Bearing (FL3307 Bearing)
A rolling bearing with inner and outer rings and cage made of resin materials offering corrosion resistance and self-lubricating properties. Suitable for environments where steel bearings cannot be used, such as underwater or in chemical solutions.
NTN Corporation
How to choose Rolling Bearings
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1. Bore and housing bore dimensions
Select the bore diameter d to match the shaft seat, the outside diameter D to match the housing bore, and the width B to suit the installation space. Main dimensions are standardized in ISO and JIS dimension series, so interchangeable products can be found by boundary dimension designation. For tapered roller bearings, also check the assembled width T; for thrust bearings, also check the height H.
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2. Dynamic load rating based on life calculation
The basic dynamic load rating Cr is the reference value for calculating rated life. Verify that the required life is met using the equivalent load during operation and the rotational speed. For ball bearings, life is proportional to the cube of the load ratio, so providing load margin greatly extends life.
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3. Margin for static and shock loads
The basic static load rating C0r is the allowable standard for permanent deformation generated at the rolling elements and raceways under stationary or low-speed conditions. For applications with oscillating motion or shock loads, confirm that a static safety factor against the maximum load is secured using C0r.
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4. Operating speed and lubrication method
The limiting speed differs by lubrication method, and separate values are given for grease lubrication and oil lubrication. Confirm that the normal operating speed does not exceed the limiting value, and in high-speed ranges also consider cage material and precision grade. The reference speed can also be consulted as a thermal guideline.
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5. Precision grade and internal clearance
Precision grades (P0, P6, P5, etc.) indicate rotational accuracy and dimensional accuracy; for high-precision applications such as machine tool spindles, select higher grades. Internal clearance (C2, CN, C3, etc.) is selected to allow for changes caused by interference fit and temperature differences during operation.
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6. Materials and lubrication suited to the environment
For corrosive, high-temperature, vacuum, or clean environments, select specifications such as rings and rolling elements made of stainless steel or ceramics, or solid lubricants and fluorine grease for vacuum use. Check the operating temperature range, low dust generation, and whether food-grade grease registration applies against the application conditions.
This guide was written by AI based on the listed products' documents and specification items. Check each manufacturer's documents before adopting.