HMK 2526 LL/3AS NTN 25x33x26 Sealed Needle Roller Bearing

What Is the HMK 2526 LL/3AS NTN Bearing?

The HMK 2526 LL/3AS NTN is a single-row drawn cup needle roller bearing with dimensions 25x33x26 mm. It features double-lip contact seals (LL) that protect the rolling elements against contamination while retaining lubricant inside the bearing. Designed for applications requiring high radial load capacity and compact installation dimensions, it is widely used in gearboxes, hydraulic equipment, industrial machinery and OEM power transmission systems.

Bearing Design

The HMK 2526 LL/3AS features:

• Drawn cup steel outer ring
• Single-row needle roller design
• Hardened steel needle rollers
• Pressed steel cage
• Double-lip contact seals (LL)
• Cylindrical bore
• Compact radial design
• Factory-lubricated construction

The integrated seals significantly improve bearing protection in dusty and contaminated operating environments while extending service life.

Technical Specification

Manufacturer: NTN

Part Number: HMK 2526 LL/3AS

Bearing Type: Drawn Cup Needle Roller Bearing

Design: Single Row

Inside Diameter (Fw): 25 mm

Outside Diameter (D): 33 mm

Width (C): 26 mm

Bearing Rows: Single Row

Seal Type: LL - Double Contact Seals

Cage: Pressed Steel

Bore Type: Cylindrical

Radial Clearance: CN

Operating Temperature: Approximately -30°C to +100°C

Basic Dynamic Load Rating (C): 21.8 kN

Basic Static Load Rating (C0): 31.5 kN

Limiting Speed (Grease): 6,500 rpm

How Does a Needle Roller Bearing Work?

A needle roller bearing uses long, slender cylindrical rollers to distribute loads across a larger contact area than conventional ball bearings.

Its primary functions include:

• Supporting high radial loads
• Reducing rotational friction
• Providing compact bearing arrangements
• Increasing load capacity with minimal installation space
• Delivering smooth and reliable shaft rotation

The LL contact seals help prevent dirt, dust and moisture from entering the bearing while retaining lubricant for longer service life.

Typical Applications

The HMK 2526 LL/3AS NTN is commonly used in:

• Industrial gearboxes
• Automotive transmissions
• Hydraulic pumps
• Hydraulic motors
• Industrial machinery
• Agricultural equipment
• Construction machinery
• Material handling equipment
• Industrial automation
• Power transmission systems
• OEM machinery
• Maintenance and Repair (MRO)

Advantages of NTN HMK Bearings

Key benefits include:

• High radial load capacity
• Compact drawn cup design
• Double contact seals for contamination protection
• Low operating friction
• Long service life
• Reliable grease retention
• Suitable for demanding industrial environments
• Easy installation

Installation Recommendations

Before installation, verify:

• Shaft diameter
• Housing bore
• Proper bearing fit
• Shaft hardness
• Lubrication conditions
• Bearing alignment
• Operating load requirements

Correct installation ensures maximum bearing life and reliable performance.

Frequently Asked Questions (FAQ)

What are the dimensions of the HMK 2526 LL/3AS NTN bearing?

The bearing has a 25 mm inside diameter, 33 mm outside diameter, and 26 mm width.

What does the LL suffix mean?

LL indicates double contact seals, which protect the bearing against contaminants and retain lubricant inside the bearing.

Does this bearing include an inner ring?

No. The bearing is designed to operate directly on a properly hardened and ground shaft or with a compatible inner ring where required.

Where is the HMK 2526 LL/3AS commonly used?

It is widely used in gearboxes, hydraulic equipment, industrial machinery, power transmission systems, agricultural machinery and OEM applications.

What is the maximum operating speed?

The limiting speed is approximately 6,500 rpm with grease lubrication.

Is this bearing suitable for contaminated environments?

Yes. The double contact seals provide effective protection against dust, dirt and moisture, making it suitable for demanding industrial operating conditions.