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When your assembly demands high radial load capacity in a minimal axial footprint, standard ball bearings fall short. Engineers, maintenance technicians, and machine builders working on gearboxes, conveyor systems, and industrial drive shafts need a bearing that handles heavy radial loads without adding bulk. These needle roller bearings with inner ring are engineered for exactly that scenario.
Each bearing consists of a drawn cup outer ring, a full complement of needle rollers, and a machined inner ring — all working together as a self-contained unit. The inner ring eliminates the need for a hardened shaft journal, simplifying installation. Available in a wide size range spanning inner diameters from 10mm (0.39 in) to 100mm (3.94 in), with outer diameters from 22mm (0.87 in) to 140mm (5.51 in) and widths from 13mm (0.51 in) to 71mm (2.80 in), covering NA4900–NA4920 and NA6907–NA6920 series.
These bearings are well-suited for needle roller bearing replacement in automotive transmission assemblies, needle bearing applications in agricultural equipment drives, and compact bearing solutions for industrial robot joints and CNC machine tool spindles where radial space is constrained.
Covers NA4900 through NA6920 — inner diameters 10mm to 100mm — so you can source the exact fit for your application without custom machining.
The machined inner ring removes the requirement for a hardened and ground shaft surface, reducing shaft preparation time and cost on retrofit projects.
Maximum roller count per bearing delivers higher radial load capacity relative to the bearing's cross-section compared to caged designs of the same envelope.
Thin-section drawn cup design keeps the radial envelope tight — ideal for gearboxes, planetary drives, and other assemblies where space between shaft and housing is limited.
Needle rollers are through-hardened for wear resistance under oscillating and rotating loads, extending service intervals in demanding duty cycles.
Available in 1, 3, 5, or 10-piece quantities — order a single bearing for a repair job or stock up in bulk packs for production line maintenance.
| Series | NA4900 – NA4920 / NA6907 – NA6920 |
|---|---|
| Inner Diameter (ID) | 10mm – 100mm (0.39 in – 3.94 in) |
| Outer Diameter (OD) | 22mm – 140mm (0.87 in – 5.51 in) |
| Width | 13mm – 71mm (0.51 in – 2.80 in) |
| Bearing Type | Needle Roller Bearing With Inner Ring |
| Roller Type | Full Complement Needle Rollers |
| Inner Ring | Machined, included |
| Material | Bearing steel (through-hardened) |
| Load Direction | Radial |
| Lubrication | See variant options |
| Operating Temperature | See variant options |
| Available Quantities | 1 pcs / 3 pcs / 5 pcs / 10 pcs |
Match the bearing designation to your shaft diameter (inner diameter) and housing bore (outer diameter). The NA4900 series uses a 13mm width, while the NA6900 series offers a wider section for higher load capacity at the same bore size. Cross-reference the size table — for example, NA4904 fits a 20mm shaft in a 37mm housing with a 17mm width.
Both series share the same inner and outer diameter for equivalent bore sizes, but the NA6900 series has a wider width (deeper cup), which increases the number of needle rollers and raises the dynamic and static radial load ratings. Choose NA6900 when your application involves heavier radial loads or shock loading.
No. Because these bearings include a machined inner ring, the shaft does not need to be hardened or ground to a bearing-quality surface finish. The inner ring acts as the raceway, which simplifies shaft design and makes these bearings a practical choice for retrofit and repair applications.
Standard needle roller bearings with inner rings are manufactured from bearing steel and are not inherently corrosion-resistant. For wet or mildly corrosive environments, ensure adequate sealing and use a compatible grease with corrosion-inhibiting additives. For heavily corrosive conditions, contact us to confirm material options.
Needle roller bearings are designed primarily for radial loads. They have very limited axial load capacity. If your application involves significant axial forces, pair these bearings with a separate thrust bearing or select a combined needle roller and thrust bearing assembly.
Grease lubrication is suitable for most applications — use a lithium-based or lithium-complex grease with an NLGI grade of 2 as a starting point. For high-speed or high-temperature applications, oil lubrication may be preferable. Fill the bearing cavity approximately one-third to one-half full with grease to avoid overheating from churning.
Press or tap the outer cup into the housing bore using a sleeve that contacts only the outer ring face — never apply force through the rolling elements. Slide the inner ring assembly onto the shaft separately, then bring the two together. Ensure the shaft and housing fits conform to the recommended tolerance classes (typically H7 for the housing, k5 or m5 for the shaft) to achieve the correct interference or clearance fit.
Multi-pack options (3, 5, or 10 pieces) offer a lower per-unit cost and ensure you have spares on hand for planned maintenance or unexpected failures. For production environments or machines with multiple bearing positions of the same size, stocking a small quantity reduces downtime when a bearing needs replacement.
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