Needle Roller Bearings – N K type – rubbersealsandgaskets.com

At Kriloha Ltd., we understand that “Space-Efficiency” should never come at the cost of “Mechanical-Integrity.” Our NK Type Needle Roller Bearings are our engineered answer for “Maximum-Power-Density” and “Precision-Radial-Support”. As a premier provider of industrial components, Kriloha has developed a solid-race needle series that balances mechanical invincibility with the design agility required for compact, modern machinery.

The engineering of our NK series is based on Direct-Shaft-Interface. By eliminating the inner ring, the rollers run directly on a hardened and ground shaft, which maximizes system rigidity and reduces the total footprint of the assembly. At Kriloha, we verify that our needle rollers are matched within 2-micron tolerances to ensure perfectly balanced load distribution. This creates a “Rigid-Resilient” support system that remains stable even under high-vibration and high-acceleration duty cycles.

Manufacturing these bearings involves strict Raceway-Finish Verification. We ensure that the integral flanges of the NK outer ring are super-finished to minimize friction during axial guidance. Whether you are optimizing a high-speed industrial motor or maintaining a critical automotive gearbox, Kriloha NK Needle Roller Bearings provide the mechanical durability your facility demands. By choosing Kriloha Ltd., you are investing in a “Miniaturized-Strength” technology that secures your highest-value rotating assets.

Bearing Table

SR. NO.	BEARING NO.	BOUNDARY DIMENSIONS (in mm)				MASS (~ Kg.)
SR. NO.	BEARING NO.	d	D	B	C	MASS (~ Kg.)
1	SJ-74882	28.580	46.040	31.800	–	0.185
2	R-0921	32.766	49.213	28.575	–	0.185
3	NK 34 x 50 x 35	34.000	50.000	35.000	–	0.195
4	SJ-74884	34.700	49.220	38.160	–	0.265
5	NKS40	34.990	55.000	22.000	40.000	0.230
6	NK 44 x 65 x 40	44.000	65.000	40.000	–	0.397
7	NK 45 x 65 x 40	45.000	65.000	40.000	–	0.369

Primary Use Cases

Automotive Drivetrains: Ideal for planetary gear sets and transmissions where radial space is strictly limited.
Industrial Gearboxes: Supporting high-torque shafts in compact reduction drives.
Power Tool Assemblies: Used in impact drills and grinders to provide robust shaft support within a slim tool housing.
Textile Machinery: Managing the high-speed oscillating movements of spinning and weaving equipment.
Agricultural Equipment: Supporting small-diameter shafts in harvesters and tillers where dirt exclusion and high load capacity are required.

Frequently Asked Questions

1. What is the difference between NK and NKI types?
The NK type does not include an inner ring and runs directly on the shaft. The NKI type includes an inner ring, making it suitable for applications where the shaft cannot be hardened and ground.
2. Does the shaft need special treatment for an NK bearing?
Yes. Since the rollers run directly on the shaft, it must be hardened (typically HRC 58–64) and precision-ground to serve as an effective inner raceway.
3. Can these bearings handle axial loads?
NK type bearings are designed for pure radial loads. If your application involves axial thrust, it should be combined with a thrust bearing or a specialized combined needle bearing.
4. Why is the lubrication hole in the outer ring important?
Because NK bearings are often used in high-speed or heavy-load environments, the lubrication hole allows for easy relubrication without disassembling the machinery, extending the bearing’s life.
5. Are custom sizes available for specialized industrial shafts?
Kriloha provides a wide range of standard ISO dimensions for NK bearings, but we can also provide specialized dimensions for custom-engineered equipment.