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NTN needle roller bearings use long, small-diameter rollers in radial supports. Pay particular attention to the shaft seating: some constructions use the shaft surface directly as a raceway. Measuring the space occupied by a removed bearing does not describe the entire assembly. The rings present and the surfaces involved in rolling must also be identified.
See all NTN bearings references →NTN guide →Needle roller bearings from all brands →NTN tapered roller bearings →NTN angular contact bearings →
The catalog includes NK14/20R, NK15/16R, NK15/20R and RNA59/22. Retain slashes and letters. In NK and RNA constructions without an inner ring, the shaft must provide a raceway prepared for that purpose; an arbitrary cylindrical surface is not equivalent.
This construction detail does not justify decoding every ending or selecting a bearing from a numeric fragment. If the removed assembly has a separate ring, photograph it and record its identification so its relationship with the requested bearing can be reviewed.
Where radial space is limited, needle rollers can form part of a compact arrangement specified by the design. Describe whether motion is continuous or oscillating and locate the support within the mechanism. Application context accompanies the original reference rather than replacing it.
Report shaft marks with photographs of the raceway and bearing. Replacing the bearing without identifying the surface contacted by the needles leaves the mounting description incomplete. Raceway finish, condition and requirements need technical documentation; this page assigns no hardness or tolerance values.
Provide MR with the full NTN designation and quantity. State whether the shaft remains in use and whether other support components are required. If markings are missing, include a sketch showing diameter, available width and stops. Distinguish measured dimensions from nominal drawing values.
No. Some run on a prepared shaft raceway, so identify the construction before replacement.
No. Construction, raceway and mounting components also need review.
Photograph the damage and indicate where the needles ran. Evaluate that observation together with the support.
Can't find the exact model? Write to us with the part number or model you're looking for: we'll find it and quote it, even if it's not listed in the catalog.
The NTN NK series needle roller bearing is a single-row radial bearing without an inner ring, mounted directly on the shaft. Its compact design with a needle cage allows it to carry high radial loads in very small radial spaces. It is used in applications where the shaft diameter is already hardened and ground, and where minimizing the envelope size is the goal. MR Accesorios Industriales sells this series.
NTN RNA series needle roller bearings are single-row needle units without an inner ring, designed to withstand high radial loads in very small radial spaces. They are mounted directly on a hardened and ground shaft that acts as the raceway, which simplifies the design and reduces the weight of the assembly. They are ideal for applications where the outer diameter is limited and high load capacity is required, such as transmissions, pumps, compressors and textile machinery.
The NTN NA series needle roller bearing is a radial bearing with high load capacity in a minimal space. Its design with an inner ring and cage-guided needles allows it to be mounted directly on machined shafts, ideal when the available outer diameter is limited. It is used in machine tools, transmission equipment, pumps and industrial applications where the load-to-space ratio is critical. MR Accesorios Industriales sells the NTN NA series in Buenos Aires, Argentina.
Just the manufacturer part number is enough: we will quote it and provide dimensions and equivalents via WhatsApp or email.
