ZARN 2557 TN LDI Combined Axial Radial Needle Roller Bearing 25x57x50

ZARN 2557 TN LDI Combined Axial Radial Needle Roller Bearing 25x57x50

ZARN 2557 TN LDI is a high precision combined axial radial bearing designed for ball screw systems, CNC machinery and industrial positioning applications requiring extremely high axial rigidity and precise motion guidance. The 25x57x50 mm construction is engineered to support both heavy radial loads and axial loads acting in both directions simultaneously.

ZARN series combined bearings integrate several bearing elements into one compact assembly:

• radial needle roller bearing
• double direction axial cylindrical roller bearings
• locating rings
• precision roller guidance cages

This design provides very high rigidity, minimal axial clearance and excellent positioning accuracy even under heavy dynamic operating loads. The bearing construction is specifically developed for precision linear motion systems and ball screw support units.

The ZARN 2557 TN model features a precision machined outer ring and cylindrical roller assembly optimized for high axial load capacity while maintaining compact dimensions. The bearing can operate with preload adjustment, allowing near elimination of axial play and significantly improved positioning precision.

ZARN combined bearings are widely used in:

• CNC machinery
• ball screw assemblies
• industrial automation
• positioning systems
• linear tables
• precision machinery
• machining centers
• measuring systems

The phrase ZARN 2557 TN 25x57x50 combined axial radial bearing is frequently searched in CNC maintenance applications and precision linear drive system upgrades.

Construction and operating characteristics

The ZARN 2557 TN LDI bearing is designed for applications requiring extremely high positioning accuracy and axial rigidity.

Main construction features:

• combined bearing construction
• simultaneous axial and radial load support
• very high axial rigidity
• compact assembly design
• preload capability
• high positioning precision
• low operating friction
• long operational lifespan

The combined construction allows simultaneous support of radial loads and bidirectional axial loads while maintaining excellent operational stability.

Technical specification

Type: Combined axial/radial needle roller bearing

Designation: ZARN 2557 TN

Manufacturer: LDI

Bearing type: Combined axial-radial bearing

Construction: Needle roller radial bearing with double direction axial cylindrical roller bearing

Sealing: Open bearing

Inner diameter: 25 mm

Outer diameter: 57 mm

Width: 50 mm

Radial section width: 20 mm

Axial section width: 10 mm

Weight: Approx. 0.53 kg

Dynamic radial load rating: 22.6 kN

Static radial load rating: 36 kN

Dynamic axial load rating: 35.5 kN

Static axial load rating: 86 kN

Grease lubrication speed limit: 1900 rpm

Oil lubrication speed limit: 6000 rpm

Applications: Ball screws, CNC machinery, positioning systems, precision linear systems, industrial automation

FAQ

What is the purpose of the ZARN 2557 TN bearing?

The bearing is mainly designed for ball screws, CNC machinery and precision positioning systems.

What does combined bearing construction mean?

The bearing integrates a radial needle roller section and axial cylindrical roller sections into one compact assembly.

Which loads can the bearing support?

The bearing supports both radial loads and bidirectional axial loads simultaneously.

Can the bearing operate with preload?

Yes. The design allows preload adjustment to eliminate axial clearance and improve positioning precision.

Where are ZARN series bearings commonly used?

They are commonly used in CNC machines, industrial automation, ball screw systems and precision linear motion applications.