NX20 INA 20x30x28 Needle Roller / Axial Ball Bearing

Overview

The NX20 INA 20x30x28 mm is a combined needle roller and axial ball bearing designed to carry both radial loads and axial loads within a compact bearing arrangement.

The radial section uses needle rollers to provide high radial load capacity with a small cross-section, while the axial ball bearing section accommodates axial loads in one direction.

The bearing has a 20 mm bore diameter, 30 mm outside diameter and 28 mm width. It is particularly useful in machinery where radial and axial support must be combined in a very limited installation space.

Industrial Applications

The INA NX20 is suitable for:

• Gearboxes
• Machine tools
• Industrial drives
• Textile machinery
• Packaging machinery
• Agricultural equipment
• Production machines
• Mechanical transmissions
• Compact drive units
• General industrial machinery

Combined Bearing Design

The NX20 combines two different bearing functions in a single compact component:

• Needle roller bearing for radial loads
• Axial ball bearing for thrust loads
• Compact radial dimensions
• Integrated radial and axial support
• Single-direction axial load capability
• High radial load capacity

This arrangement reduces the number of separate bearing components required in the machine and helps minimize overall installation space.

Needle Roller Radial Section

The radial section consists of needle rollers with a large length-to-diameter ratio.

This geometry provides high radial load capacity despite the bearing's very small outside diameter of only 30 mm.

The needle roller section is therefore particularly useful where the available radial installation space is limited.

Axial Ball Bearing Section

The axial component uses a ball bearing arrangement designed to accommodate axial force in one direction.

This allows the NX20 to provide axial guidance together with radial support in a single bearing unit.

Where axial loads occur in both directions, the complete bearing arrangement must be designed accordingly.

Technical Specification

Manufacturer: INA / Schaeffler

Designation: NX20 / NX20-XL

Bearing Type: Combined radial / axial bearing

Radial Bearing Type: Needle roller bearing

Axial Bearing Type: Axial ball bearing

Axial Load Direction: Single direction

Bore Diameter d: 20 mm

Outside Diameter D: 30 mm

Width B: 28 mm

Dimensions: 20x30x28 mm

Construction: Combined needle roller / axial ball bearing

Radial Load Capability: Yes

Axial Load Capability: Yes, one direction

Measurement System: Metric

NX20 Designation Explained

NX - combined needle roller and axial ball bearing series

20 - bearing size corresponding to a 20 mm bore

XL - Schaeffler X-life performance designation for current production variants

The full designation should be checked when selecting a replacement because NX20, NX20-Z and current NX20-XL variants can differ in lubrication arrangement and axial component execution.

Radial and Axial Load Capability

The main advantage of the INA NX20 is its ability to combine radial and axial bearing functions.

The needle roller component carries the radial load, while the axial ball bearing component supports thrust loading.

This configuration is especially useful when a conventional radial bearing and separate thrust bearing would require too much installation space.

Compact Installation

With dimensions of only 20x30x28 mm, NX20 provides radial and axial support within an extremely compact envelope.

The difference between the 20 mm bore and 30 mm outside diameter is only 10 mm, allowing the bearing to be used in space-constrained mechanical assemblies.

Lubrication Variant

Current Schaeffler documentation distinguishes between NX variants according to lubrication arrangement.

The standard NX20-XL is intended for oil lubrication, while NX20-Z-XL is a self-retaining variant with a cover and is designed for grease lubrication.

For this reason, the exact suffix should be checked when replacing an existing bearing.

Operational Advantages

• Combines radial and axial bearing functions.
• Compact dimensions of 20x30x28 mm.
• High radial load capacity from needle rollers.
• Single-direction axial load capability.
• Reduces the number of separate bearing components.
• Suitable for space-constrained industrial designs.

Replacement and Bearing Selection

When replacing an INA NX20, verify:

• Dimensions 20x30x28 mm
• Exact suffix
• Lubrication method
• Axial load direction
• Radial load requirements
• Operating speed
• Shaft and housing fits
• Operating temperature

A bearing with the same basic dimensions should not automatically be treated as an identical replacement if the suffix or lubrication design differs.

AI OVERVIEW

The NX20 INA 20x30x28 mm is a compact combined needle roller and axial ball bearing designed to carry radial loads and single-direction axial loads in one assembly. Its needle roller section provides high radial capacity, while the thrust ball section provides axial support, making it suitable for gearboxes, machine tools, drives and compact industrial machinery.

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FAQ

What are the dimensions of INA NX20?

The bearing dimensions are 20x30x28 mm: 20 mm bore diameter, 30 mm outside diameter and 28 mm width.

What type of bearing is NX20 INA?

It is a combined needle roller and axial ball bearing.

What does NX mean?

NX identifies the INA/Schaeffler series of combined needle roller and axial ball bearings.

Can NX20 carry radial loads?

Yes. The needle roller component is designed to carry radial loads.

Can NX20 carry axial loads?

Yes. The axial ball bearing component carries axial loads in one direction.

Can NX20 carry axial loads in both directions?

The standard axial component is designed for single-direction axial loading. The complete machine arrangement must provide the required support if loads act in both directions.

Why is NX20 considered a combined bearing?

Because it integrates a radial needle roller bearing and an axial ball bearing in one component.

What is the bore diameter?

The bore diameter is 20 mm.

What is the outside diameter?

The outside diameter is 30 mm.

What is the bearing width?

The width is 28 mm.

What does XL mean?

XL is Schaeffler's X-life designation for optimized current-generation bearing designs.

Is NX20 the same as NX20-Z?

No. The suffix Z identifies a different execution with a cover and different lubrication characteristics.

What lubrication is used for NX20-XL?

Current Schaeffler documentation specifies the NX20-XL version for oil lubrication.

What lubrication is used for NX20-Z-XL?

The Z version is intended for grease lubrication.

Where is INA NX20 used?

Typical applications include gearboxes, industrial drives, machine tools, production machinery and compact transmission units.

Why use NX20 instead of two separate bearings?

A combined bearing reduces installation space and simplifies the bearing arrangement by integrating radial and axial support.

Is NX20 suitable for high radial loads?

The needle roller component provides relatively high radial load capacity for the compact bearing dimensions.

Can another 20x30x28 bearing replace NX20?

Not automatically. The replacement must also provide the required combined radial and axial function.

What is the correct parent category?

The product belongs to the category Combined Needle Roller / Axial Ball Bearings.

Who manufactures NX20?

The bearing is manufactured under the INA brand, part of the Schaeffler Group.