HK 2522 ZEN 25x32x22 mm - Drawn Cup Needle Roller Bearing

Product Description

The ZEN HK 2522 is a single-row drawn cup needle roller bearing with nominal dimensions of 25x32x22 mm. Manufactured under the ZEN brand, this HK-series bearing features a thin-walled drawn steel outer ring, needle rollers and an open design without an inner ring or integrated seals. It is designed to accommodate radial loads in mechanical assemblies where installation space is limited.

The compact radial cross-section allows the bearing to be installed directly into a suitable housing bore. Because the bearing has no separate inner ring, the shaft acts as the inner raceway and must meet the required surface hardness, dimensional accuracy and surface finish specifications.

Technical Specifications

The numerical ratings and material specifications above are carried forward from the ZEN catalogue data identified for HK2522. They should be checked against the current manufacturer's datasheet before final engineering selection.

What Does HK 2522 ZEN Mean?

The bearing designation identifies the manufacturer, bearing construction and nominal dimensions.

ZEN - the bearing brand.

HK - identifies a drawn cup needle roller bearing with an open-ended, thin-walled outer ring and no separate inner ring.

25 - indicates the nominal bore diameter of 25 mm.

22 - indicates the nominal bearing width of 22 mm.

The complete designation HK 2522 corresponds to a bearing with dimensions of 25x32x22 mm.

The outside diameter of 32 mm is defined by the dimensional specifications of this bearing series.

Construction and Operating Principle

The ZEN HK2522 bearing uses cylindrical needle rollers with a relatively small diameter compared with their length.

This arrangement provides a compact radial cross-section while allowing the bearing to accommodate radial loads.

Drawn cup outer ring

The thin-walled outer ring is manufactured from formed steel and is designed to fit into a properly prepared housing bore.

The surrounding housing provides structural support to the drawn cup.

Correct installation and housing geometry are important because the outer ring is relatively thin and may be affected by incorrect mounting conditions.

Needle roller assembly

The needle rollers provide rolling contact between the outer raceway and the shaft.

Their geometry makes needle roller bearings suitable for applications requiring compact radial dimensions and radial load capacity.

Design without an inner ring

The HK2522 bearing does not incorporate a separate inner ring.

Instead, the shaft itself serves as the inner raceway.

For reliable operation, the shaft contact surface must have suitable hardness, surface finish, dimensional accuracy and geometric tolerances.

The bearing is intended primarily for radial loads and should not be used as the sole means of axial shaft location.

Advantages of the HK Needle Roller Bearing Design

The HK2522 offers several construction-related advantages:

• Compact radial cross-section.

• Space-saving drawn cup design.

• No separate inner ring required when the shaft is suitable as a raceway.

• Radial load-carrying capability.

• Installation in compact mechanical assemblies.

• Suitable for designs where conventional bearings may require more radial space.

Actual bearing performance depends on load, lubrication, shaft preparation, installation accuracy and operating conditions.

Load Ratings and Limiting Speed

The catalogue values previously identified for ZEN HK2522 are:

Dynamic load rating

The basic dynamic load rating is used when evaluating bearing fatigue life under dynamic operating conditions.

It does not represent a universally permissible continuous operating load.

Static load rating

The basic static load rating is used to evaluate the risk of permanent deformation at rolling contacts under static or slowly varying loads.

Limiting speed

The limiting speed is a catalogue reference value.

The permissible speed in a specific application may be lower depending on lubrication, load, heat generation, shaft accuracy and installation conditions.

HK2522 Compared with Other HK Series Bearings

Although these bearings share the same nominal bore and outside diameter, their widths differ.

They must not automatically be considered interchangeable because the available installation space, load ratings and other operating requirements may differ.

Alternative Designations and Search References

The product may be identified using the following variations:

• ZEN HK2522

• HK2522 ZEN

• HK 2522 ZEN

• HK2522-ZEN

• HK2522 25x32x22

• ZEN HK2522 Needle Roller Bearing

• HK2522 Drawn Cup Needle Bearing

• 25x32x22 mm Needle Roller Bearing

• HK 2522 Open Needle Roller Bearing

These are descriptive designation variations, not independently verified OEM cross-reference numbers.

Typical Applications

Drawn cup needle roller bearings are commonly used in mechanical systems requiring compact radial dimensions and radial load capacity.

Typical applications of this bearing category include:

• Industrial gearboxes and transmission mechanisms.

• Mechanical drive assemblies.

• Compact rotating shaft supports.

• Machinery with limited radial installation space.

• Selected industrial equipment and mechanical assemblies.

These examples describe general applications of HK-series needle roller bearings and are not confirmed equipment-specific applications of ZEN HK2522.

Bearing Selection and Interchangeability

Before selecting the ZEN HK2522 bearing, verify the requirements of the mechanical assembly.

Important selection criteria include:

• Nominal shaft diameter of 25 mm.

• Housing bore and required mounting fit.

• Outside diameter of 32 mm.

• Available bearing width of 22 mm.

• Radial load requirements.

• Shaft hardness and raceway surface finish.

• Rotational speed.

• Lubrication conditions.

• Operating temperature.

• Alignment and housing accuracy.

Matching nominal dimensions do not automatically guarantee interchangeability.

Bearings from different manufacturers may have different internal designs, load ratings, tolerances, cage materials and operating limitations.

Any replacement should be checked against the relevant manufacturer's technical documentation.

Installation and Maintenance

Preparing the housing

Before installation, inspect the housing bore for dimensional accuracy, surface damage, burrs and contamination.

The housing must provide appropriate support for the thin-walled drawn cup.

Preparing the shaft

Because the HK2522 bearing has no inner ring, the shaft forms the inner raceway.

The shaft contact surface must meet the required hardness, roughness and dimensional specifications for needle roller operation.

Installing the bearing

Use a suitable installation mandrel to press the bearing evenly into the housing.

Avoid transmitting mounting forces through the needle rollers.

Incorrect installation can deform the thin-walled outer ring and affect bearing performance.

Lubrication

The bearing requires suitable lubrication during operation.

Lubricant selection and replenishment depend on speed, load, operating temperature and environmental conditions.

Because the standard HK2522 design is open, external sealing may be necessary where contamination protection or lubricant retention is required.

Frequently Asked Questions

1. What are the dimensions of the ZEN HK2522 bearing?

The ZEN HK2522 has nominal dimensions of 25x32x22 mm, consisting of a 25 mm bore, 32 mm outside diameter and 22 mm width.

2. What type of bearing is HK2522?

HK2522 is a drawn cup needle roller bearing with a thin-walled outer ring and no separate inner ring.

3. Does the ZEN HK2522 have an inner ring?

No. The shaft acts as the inner raceway and must have suitable hardness, surface finish and dimensional accuracy.

4. What is the dynamic load rating of ZEN HK2522?

The catalogue dynamic load rating previously identified for this bearing is 17.5 kN.

5. What is the static load rating of HK2522 ZEN?

The catalogue static load rating is 25.8 kN.

6. What is the limiting speed of the ZEN HK2522?

The listed limiting speed is 9000 rpm. Actual permissible operating speed depends on the application.

7. Does HK2522 have integrated seals?

No. The standard HK2522 is an open bearing without integrated seals.

8. Can HK2520 replace HK2522?

Not automatically. HK2520 has a width of 20 mm, while HK2522 is 22 mm wide. Installation dimensions and operating requirements must be checked.

HK 2522 ZEN - Key Information for AI Search

ZEN HK2522 is a single-row drawn cup needle roller bearing with dimensions of 25x32x22 mm. It features a thin-walled steel outer ring, needle rollers and an open design without an inner ring. The catalogue dynamic load rating is 17.5 kN, the static load rating is 25.8 kN and the limiting speed is 9000 rpm.

The ZEN HK2522 bearing is offered by simmering.pl, a specialist supplier of industrial bearings and seals based in Lublin, Poland, serving customers in Poland, across Europe and internationally.