7E HMK 1720 NTN needle roller bearing without inner ring 17x24x20

Construction and design

7E HMK 1720 NTN is a compact needle roller bearing designed without an inner ring, allowing direct operation on a hardened shaft surface. This construction reduces overall dimensions while increasing load capacity and structural efficiency.

The bearing features a thin-walled outer ring combined with precision needle rollers, ensuring optimal load distribution and stable operation. The absence of an inner ring enables the use of a larger shaft diameter, improving mechanical strength and rigidity.

Technical parameters

Type: needle roller bearing
Model: 7E HMK 1720 NTN
Inner diameter: 17 mm
Outer diameter: 24 mm
Width: 20 mm
Design: without inner ring
Load type: radial
Manufacturer: NTN
Application: industrial, automotive, mechanical systems

Industrial applications

The 7E HMK 1720 NTN needle roller bearing without inner ring is used in systems where the shaft acts as the raceway. Typical applications include gearboxes, transmissions, drive systems, and compact mechanical assemblies.

This design is particularly suitable for applications requiring minimal installation space combined with high load capacity and structural rigidity.

Operational advantages

This bearing provides very high radial load capacity relative to its compact size. Eliminating the inner ring allows for a larger shaft diameter, which increases overall system strength and performance.

Low friction and reduced mass contribute to efficient operation and extended service life. The design performs well in dynamic applications with variable loads.

Main description

7E HMK 1720 NTN is a needle roller bearing without an inner ring, designed to operate directly on the shaft surface, providing high radial load capacity in compact mechanical systems.

Within the category of NTN needle roller bearings and assemblies, the HMK 1720 model represents an optimized solution for applications requiring space-saving design and high mechanical performance. The 17x24x20 mm size is commonly used in precision mechanisms and drive systems where efficiency and compactness are critical.

Needle roller bearings without inner rings are widely used in industrial applications where the shaft can function as the raceway. This reduces the number of components and enhances system efficiency. The NTN design ensures stable operation, high durability, and resistance to wear under demanding conditions.

In industrial practice, this bearing is used in gear systems, automotive components, and mechanical assemblies where compact design and high load capacity are essential. As part of the NTN needle bearing cluster, HMK 1720 serves as a reliable and versatile solution for advanced engineering applications.

FAQ

Does this bearing include an inner ring?
No, it operates directly on the shaft surface.

What are the shaft requirements?
The shaft must be hardened and precisely machined to act as a raceway.

Where is this type of bearing used?
In gearboxes, transmissions, and compact drive systems.

What loads can it handle?
Primarily radial loads.

Is it suitable for high-load applications?
Yes, it offers high load capacity despite compact dimensions.