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When shaft space is tight but radial load demands are high, standard ball bearings fall short. Engineers, mechanics, and DIY builders working on gearboxes, automotive drivetrains, agricultural equipment, and industrial machinery need a bearing that delivers maximum load capacity in a minimal envelope. The NA4900–NA4919 series needle roller bearings with inner ring are engineered precisely for these demanding scenarios.
Each bearing consists of a drawn cup outer ring, a full complement of hardened steel needle rollers, and a machined inner ring — all manufactured from bearing-grade steel. Available sizes span inner diameters from 10mm to 30mm (approximately 0.39" to 1.18"), outer diameters from 22mm to 47mm (approximately 0.87" to 1.85"), and heights of 13mm or 17mm (approximately 0.51" to 0.67"), covering the NA4900 through NA4919 designation range.
Typical applications include compact gearbox shaft support, connecting rod small-end bearings in small engines, conveyor roller assemblies requiring high radial stiffness, and precision motion control systems where axial space is constrained. The included inner ring eliminates the need for a hardened shaft surface, making these bearings ideal for replacement and retrofit projects.
Maximizes the number of rolling elements for superior radial load capacity relative to bearing cross-section — ideal for space-constrained assemblies.
The included inner ring distributes load evenly across the needle rollers and removes the need for a hardened shaft journal, simplifying installation in retrofit and repair applications.
Drawn cup outer ring and inner ring are manufactured from through-hardened bearing steel, providing resistance to deformation under sustained radial loads and cyclic stress.
Seven size options from 10×22×13mm to 30×47×17mm (ID×OD×H) cover a broad range of shaft diameters and housing bores within a single product family.
The drawn cup design keeps the radial wall thickness minimal, enabling use in assemblies where a standard deep-groove ball bearing would not physically fit.
Available in packs of 1, 2, 3, 5, or 10 pieces — order exactly what your project requires, from single-unit repairs to small production runs.
| Bearing Series | NA4900 – NA4919 |
|---|---|
| Type | Needle Roller Bearing with Inner Ring (Drawn Cup) |
| Inner Diameter (ID) | 10 – 30 mm (0.39" – 1.18") |
| Outer Diameter (OD) | 22 – 47 mm (0.87" – 1.85") |
| Height | 13 – 17 mm (0.51" – 0.67") |
| Available Size Options | 10×22×13, 12×24×13, 15×28×13, 17×30×13, 20×37×17, 25×42×17, 30×47×17 (mm) |
| Material | Bearing-grade hardened steel |
| Outer Ring Type | Drawn cup |
| Inner Ring | Included (machined) |
| Rolling Element | Full complement needle rollers |
| Lubrication | See variant options |
| Dynamic Load Rating | See variant options |
| Static Load Rating | See variant options |
| Max Operating Speed | See variant options |
| Pack Quantity | 1 / 2 / 3 / 5 / 10 Pcs (select above) |
Match the bearing's Inner Diameter (ID) to your shaft diameter and the Outer Diameter (OD) to your housing bore. The Height dimension must fit within your available axial space. Cross-reference with the NA49xx designation chart: for example, NA4900 corresponds to 10×22×13mm. Always measure your existing bearing or shaft/housing before ordering.
No. The integrated inner ring is the key advantage of the NA49xx series over caged needle roller assemblies without an inner ring. Because the needles run on the inner ring surface rather than directly on the shaft, the shaft does not need to be case-hardened or ground to bearing tolerances. This makes these bearings well-suited for replacement and retrofit applications.
The full complement needle roller design maximizes the number of rolling elements, giving these bearings a higher radial load capacity per unit cross-section than equivalent ball bearings. Specific dynamic (C) and static (C₀) load ratings vary by size — consult the NA49xx series datasheet for your specific designation. As a general guide, the 10mm ID variant handles lighter loads while the 30mm ID variant supports significantly higher radial forces.
These bearings are manufactured from standard bearing-grade carbon-chromium steel, which provides good wear resistance under normal operating conditions. They are not inherently stainless and will corrode if exposed to moisture or aggressive chemicals without adequate lubrication or protective coatings. For wet or corrosive environments, ensure proper sealing and re-lubrication intervals, or consider stainless steel variants for your application.
Grease lubrication is suitable for most low-to-medium speed applications. For higher speeds or elevated temperatures, oil lubrication may be preferred. Apply lubricant before installation and establish a re-lubrication schedule based on operating speed, load, and environmental conditions. Avoid over-greasing, which can cause heat buildup in full complement designs.
Yes, provided the dimensional specifications (ID × OD × Height) match the OEM bearing exactly. The NA49xx designation is an internationally standardized series, so these bearings are dimensionally interchangeable with other manufacturers' NA4900–NA4919 bearings. Always verify the designation and dimensions against your service manual or the original bearing's markings before installation.
Each pack contains the selected quantity of identical bearings in the same size. Multi-packs (2, 3, 5, or 10 Pcs) offer a lower per-unit cost and are practical for applications requiring multiple bearings — such as both ends of a shaft, multiple conveyor rollers, or keeping spares on hand for maintenance. Select the quantity that matches your project needs using the Amount option above.
