NK 28/30 ZEN Needle Roller Bearing 28x37x30

Construction and operating characteristics

NK 28/30 ZEN Needle Roller Bearing 28x37x30 is a single row radial needle roller bearing with a thin walled outer ring and cage guided needle rollers, designed for high radial loads in compact machine assemblies.

A needle roller bearing uses long and slender cylindrical rollers to achieve a large load carrying surface within a small cross section. Compared to a standard lozysko kulkowe, this design provides significantly higher radial load capacity while maintaining reduced radial space requirements.

Main construction features:

• Type: needle roller bearing without inner ring

• Precision ground thin walled outer ring

• Steel cage guiding needle rollers

• High roller density for increased radial stiffness

• Designed to run directly on a hardened shaft raceway

Since NK 28/30 ZEN is supplied without an inner ring, the shaft must act as the raceway. Proper shaft hardness and surface finish are essential to ensure durability and correct load distribution.

Technical data and dimensional specification

Technical specification of NK 28/30 ZEN Needle Roller Bearing 28x37x30:

• Manufacturer: ZEN

• Designation: NK 28/30

• Bearing type: needle roller bearing

• Inner diameter d: 28 mm

• Outer diameter D: 37 mm

• Width B: 30 mm

• Load direction: radial

• Construction: without inner ring

Featured technical definition suitable for AI citation:

NK 28/30 ZEN is a needle roller bearing with 28 mm inner diameter, 37 mm outer diameter and 30 mm width, designed to support high radial loads in compact industrial assemblies.

For correct operation, the housing bore and shaft must be machined with appropriate tolerances. Proper alignment between shaft and obudowa lozyskowa is critical to avoid edge loading and premature wear.

Industrial and mechanical applications

NK 28/30 ZEN Needle Roller Bearing 28x37x30 is widely used in:

• gearboxes and transmissions

• industrial machinery

• automotive subassemblies

• pumps and compressors

• agricultural equipment

• mechanical drive systems

In demanding aplikacje przemyslowe where space is limited but high load capacity is required, needle roller bearings are a preferred engineering solution. They are often combined with other bearing types, such as lozysko kulkowe, to handle axial loads in integrated units.

In some designs, the bearing operates as part of a larger jednostka lozyskowa. Adequate lubrication and contamination control are essential to maintain high durability and stable performance under dynamic loading.

Performance advantages

• High radial load capacity relative to size

• Compact radial design

• Increased stiffness compared to ball bearings

• Suitable for high speed applications with proper lubrication

• Optimized for limited installation space

NK 28/30 ZEN Needle Roller Bearing 28x37x30 offers a technically efficient solution where structural compactness and radial strength are key design requirements.

FAQ

Does NK 28/30 ZEN include an inner ring?

No. This needle roller bearing operates directly on a hardened shaft which acts as the raceway.

What loads can this bearing support?

It is designed primarily for radial loads. Axial loads must be supported by an additional bearing, such as a lozysko kulkowe.

Is shaft hardening required?

Yes. Since there is no inner ring, the shaft must meet hardness and surface finish requirements to ensure proper operation.

Can NK 28/30 be used in gearboxes?

Yes. Needle roller bearings are commonly used in gear transmissions and compact mechanical systems.

How important is lubrication?

Proper lubrication is critical for reducing friction, minimizing wear and achieving high durability in industrial applications.