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When space is tight but load demands are high, engineers and DIY builders alike need a bearing that delivers without bulk. The NA4900–NA4919 series drawn cup needle roller bearings with inner ring are engineered for applications where radial space is limited — making them a go-to choice for automotive transmission components, industrial gearboxes, and precision machinery assemblies.
Each bearing in this series features a drawn cup outer ring combined with a machined inner ring, providing a complete, ready-to-install unit. The rolling elements are needle rollers — cylindrical rollers with a high length-to-diameter ratio — enabling a high load capacity relative to the bearing's compact cross-section. Available sizes span from NA4900 (ID 10mm / 0.394" × OD 22mm / 0.866" × Height 13mm / 0.512") through NA4919 (ID 95mm / 3.740" × OD 130mm / 5.118" × Height 35mm / 1.378"), covering a wide range of shaft diameters from 10mm to 95mm (approximately 0.39" to 3.74").
These bearings are widely used in automotive driveline and transmission rebuilds, industrial conveyor and gearbox assemblies, and precision CNC machine tool spindles — anywhere a compact radial bearing with an integrated inner ring is required for reliable shaft support.
| Bearing Series | NA4900 – NA4919 |
|---|---|
| Bearing Type | Drawn Cup Needle Roller Bearing with Inner Ring |
| Inner Diameter (ID) | 10mm – 95mm (0.394" – 3.740") |
| Outer Diameter (OD) | 22mm – 130mm (0.866" – 5.118") |
| Height / Width | 13mm – 35mm (0.512" – 1.378") |
| Variant Sizes | See variant options |
| Material — Rolling Elements | Bearing steel (typically GCr15 equivalent) |
| Material — Inner Ring | Bearing steel, hardened and ground |
| Material — Outer Cup | Case-hardened drawn steel |
| Cage Type | See variant options |
| Lubrication | Grease-lubricated (relubrication recommended for extended service) |
| Operating Temperature Range | Typically –20°C to +120°C (–4°F to +248°F) |
| Load Direction | Radial only |
| Standard | ISO / JIS NA49 series |
| Weight | See variant options |
Match the bearing's Inner Diameter (ID) to your shaft diameter. For example, if your shaft is 25mm, select NA4905 (25×42×17). Then confirm the Outer Diameter (OD) fits your housing bore and the Height fits your available axial space. All dimensions are listed in each variant name in the format ID×OD×Height (mm).
No — drawn cup needle roller bearings are designed exclusively for radial loads. They have no axial load capacity. If your application involves combined radial and axial loads, you will need to pair this bearing with a separate thrust bearing or select a different bearing type such as a combined needle/thrust bearing.
No. Because this series includes an integrated inner ring, the needle rollers run on the hardened inner ring surface rather than directly on the shaft. This means you can use a standard (non-hardened) shaft, which is one of the key advantages of the NA49 series over open-type needle roller bearings without an inner ring.
Standard NA49 series bearings are made from bearing steel and are not inherently corrosion-resistant. For environments with moisture, mild chemicals, or wash-down conditions, apply a compatible bearing grease with corrosion-inhibiting properties and consider re-greasing intervals. For highly corrosive environments, contact us to confirm suitability or explore stainless-steel alternatives.
The NA49 series includes an inner ring (hence the "A" designation), allowing direct shaft mounting on a standard shaft. The RNA49 series does not include an inner ring and requires a hardened, precision-ground shaft surface to act as the inner raceway. If your shaft is already hardened and ground to the correct tolerance, RNA49 may be used; otherwise, NA49 is the correct choice.
These bearings are typically supplied with an initial grease fill. For most applications, use a lithium-based or polyurea-based bearing grease with an NLGI grade 2 consistency. Re-greasing intervals depend on operating speed, temperature, and load — as a general guideline, re-grease every 500–2,000 operating hours. Consult your application's service manual for specific intervals.
Yes. The NA4900–NA4919 series is dimensioned to ISO/JIS NA49 standards, making them dimensionally interchangeable with equivalently designated bearings from other manufacturers. Always verify the ID, OD, and Height dimensions match your existing bearing before installation.
