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NK 45 30 Bearing Features and Application

4 Published by admin Jun 17,2026

The NK 45 30 bearing series are the most widely used mainstream series in needle roller bearings. The overall structure has the core advantages of compact radial structure.Strong load-bearing capacity.And adaptability to installation space limited scenarios. The NK 45 30 bearing are equipped with thin and long rollers (roller diameter D ≤ 5mm, aspect ratio L/D ≥ 2.5). Compared with other types of bearings.They have a smaller outer diameter under the same inner diameter and load conditions.Making them particularly suitable for support structures with limited radial installation dimensions. Most of them adopt a design without an inner ring.Directly using the shaft neck as the raceway.Further saving installation space. Generally, it only bears radial loads. High load-bearing capacity.Suitable for supporting structures with limited installation dimensions. The journal surface is hardened as a rolling surface.And the bearing is fitted into the seat hole with a press fit,.Without the need for axial positioning. Bearings should be injected with an appropriate amount of lubricating grease before installation.And usually do not need to be lubricated again after assembly. nk 45 30 bearing feature

Features: Most of them have no inner ring or sealing structure.And some models have flanges for axial positioning; It can only withstand radial loads and is made of high-quality steel with low friction coefficient and high dimensional accuracy. Some models can work stably in high temperature environments.
Applicable requirements: The design without an inner ring has high requirements for the shaft.Requiring quenching and grinding of the shaft raceway surface to achieve the required hardness and surface roughness.

Application areas: Widely used in general industrial scenarios.Including mainstream industries such as engineering machinery, machine tools, automobiles, metallurgy, mining, petroleum, machinery, electricity, railways, etc.Small size models are commonly used in equipment such as textile machinery, household appliances, scientific instruments, and sputum pumps that require compact radial space. Large size models are often used as support structures for heavy industrial equipment.

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