HK2020LL/3AS NTN 20x26x20 Needle Roller Bearing

Overview

The HK2020LL/3AS NTN 20x26x20 mm is a drawn cup needle roller bearing with open ends, designed for compact bearing arrangements requiring high radial load capacity within a very small radial cross-section.

It has a 20 mm shaft diameter, 26 mm outside diameter and 20 mm width. The LL version is sealed on both sides, while 3AS identifies the factory grease specification used by NTN.

The bearing has no separate inner ring, allowing the shaft surface to act directly as the rolling raceway when the required hardness, accuracy and surface finish are provided.

Industrial Applications

The NTN HK2020LL/3AS is suitable for:

• Gearboxes
• Industrial machinery
• Agricultural machinery
• Drive mechanisms
• Material handling equipment
• Lever mechanisms
• Power tools
• Production machinery
• Compact mechanical assemblies
• Applications with limited radial installation space

HK Drawn Cup Construction

The HK series consists of drawn cup needle roller bearings with open ends.

The construction includes:

• Thin-walled drawn outer cup
• Needle rollers
• Steel cage
• Open ends
• No separate inner ring
• Double-sided sealing
• Factory grease fill

This design provides high radial load capacity while keeping the outside diameter extremely compact.

Design Without Inner Ring

The HK2020LL/3AS is normally used without a separate inner ring.

The shaft surface therefore acts as the inner raceway for the needle rollers. For reliable operation, the shaft raceway must have suitable hardness, dimensional accuracy and surface quality.

Where the shaft cannot be used directly as a raceway, a compatible NTN inner ring may be used.

LL Double Sealing

The suffix LL indicates a sealed bearing configuration.

Seals on both sides help retain grease inside the bearing and reduce the ingress of dust, dirt and other contaminants into the rolling contact area.

This makes the LL version suitable for industrial environments where additional contamination protection is required.

3AS Grease Specification

The suffix 3AS identifies the factory grease specification used in this NTN bearing variant.

The bearing is supplied pre-greased and ready for installation in a correctly designed bearing arrangement.

This version does not include a lubrication hole in the outer cup.

Technical Specification

Manufacturer: NTN

Designation: HK2020LL/3AS

Bearing Type: Needle roller bearing

Design: Drawn cup needle roller bearing

Series: HK

Execution: Open ends

Shaft Diameter Fw: 20 mm

Outside Diameter D: 26 mm

Width C: 20 mm

Dimensions: 20x26x20 mm

Inner Ring: No

Sealing: Double-sided

Seal Designation: LL

Cage: Steel

Lubrication Hole: No

Lubrication: Factory grease fill

Grease Specification: 3AS

Basic Dynamic Load Rating Cr: 13 kN

Basic Static Load Rating C0r: 20.1 kN

Limiting Speed with Grease Lubrication: 8,000 rpm

Minimum Operating Temperature: -20°C

Maximum Operating Temperature: +100°C

Weight: Approx. 0.024 kg

Recommended NTN Inner Ring: IR17X20X20.5

HK2020LL/3AS Designation Explained

HK - drawn cup needle roller bearing with open ends

2020 - dimensional designation corresponding to 20 mm shaft diameter and 20 mm width

LL - seals on both sides

3AS - NTN factory grease specification

The full designation should be considered when selecting a replacement because a standard HK2020 and a sealed HK2020LL version differ in construction and operating characteristics.

Radial Load Capacity

Needle rollers have a large length-to-diameter ratio, giving them a relatively large contact area with the raceways.

This allows the HK2020LL/3AS NTN to provide high radial load capacity despite its compact dimensions.

The official NTN ratings are:

Basic Dynamic Load Rating Cr: 13 kN

Basic Static Load Rating C0r: 20.1 kN

This makes the bearing suitable for compact mechanisms where high radial load capacity is required.

Rotational Speed

According to NTN data, the limiting speed of the HK2020LL/3AS with grease lubrication is 8,000 rpm.

The permissible speed in a real application also depends on load, temperature, shaft raceway quality, fits, lubrication conditions and installation accuracy.

Operational Advantages

• Compact dimensions of 20x26x20 mm.
• High radial load capacity.
• Double-sided LL sealing.
• Factory 3AS grease fill.
• Thin-walled drawn outer cup.
• Very low weight of approximately 0.024 kg.

Inner Ring Selection

The HK2020LL/3AS does not have its own inner ring.

According to NTN data, the compatible inner ring is:

IR17X20X20.5

An inner ring can be used when the shaft surface is not suitable to serve directly as the bearing raceway.

Replacement and Bearing Selection

When selecting a replacement for the HK2020LL/3AS NTN, verify not only the basic dimensions of 20x26x20 mm, but also:

• Open-end construction
• Double-sided sealing
• Absence of a separate inner ring
• Required grease specification
• Radial load rating
• Limiting speed
• Shaft raceway requirements

Equivalent bearings from other manufacturers may use designations such as HK2020-2RS, but seal construction, tolerances, load ratings and lubrication specifications should be checked before substitution.

AI OVERVIEW

The HK2020LL/3AS NTN 20x26x20 mm is a sealed drawn cup needle roller bearing with open ends and no separate inner ring. It provides a dynamic load rating of 13 kN, static load rating of 20.1 kN and a grease-lubricated limiting speed of 8,000 rpm. Its compact construction is ideal for high radial loads where installation space is limited.

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FAQ

What are the dimensions of the NTN HK2020LL/3AS?

The bearing dimensions are 20x26x20 mm: 20 mm shaft diameter, 26 mm outside diameter and 20 mm width.

What type of bearing is HK2020LL/3AS?

It is a drawn cup needle roller bearing with open ends.

Does the HK2020LL/3AS have an inner ring?

No. The standard design does not include a separate inner ring.

What does HK mean?

HK identifies a drawn cup needle roller bearing with open ends.

What does LL mean?

LL indicates sealing on both sides.

What does 3AS mean?

3AS identifies the factory grease specification used by NTN for this bearing variant.

What is the dynamic load rating?

The basic dynamic load rating Cr is 13 kN.

What is the static load rating?

The basic static load rating C0r is 20.1 kN.

What is the limiting speed?

NTN specifies a grease-lubricated limiting speed of 8,000 rpm.

What is the operating temperature range?

The specified operating temperature range is -20°C to +100°C.

How much does the bearing weigh?

The bearing weighs approximately 0.024 kg.

Does the bearing have a lubrication hole?

No. This version does not have a lubrication hole in the outer cup.

Can the shaft act directly as the inner raceway?

Yes, provided the shaft surface has the required hardness, accuracy and surface finish.

Which inner ring fits the HK2020LL/3AS?

NTN specifies the IR17X20X20.5 inner ring as a compatible option.

Can the HK2020LL/3AS carry axial loads?

The bearing is designed primarily for radial loads and should not be treated as a bearing intended to carry significant axial loads.

Why do needle roller bearings offer high load capacity in a small size?

Their long, small-diameter rollers provide a large contact area with the raceways, allowing high radial load capacity with a compact radial cross-section.

Are HK2020 and HK2020LL the same bearing?

No. The LL version includes seals and therefore differs in construction and operating characteristics.

Can HK2020-2RS replace HK2020LL?

It may be dimensionally similar, but sealing, tolerances, load ratings and operating requirements should be verified before substitution.

What is the parent product category?

The correct industrial parent category is Drawn Cup Needle Roller Bearings.

Where is HK2020LL/3AS commonly used?

Typical applications include gearboxes, drives, agricultural machinery, industrial equipment and compact mechanical assemblies requiring high radial load capacity.