Machined Needle Roller Bearing NA4909, Inner Ring with Oil Hole, High-Carbon Steel, 45 mm ID x 68 mm OD x 22 mm Width, Caged NA49 Metric Series, Single Unit

Machined needle roller bearing NA4909, single unit
✔️ 45 mm ID x 68 mm OD x 22 mm W, high-carbon steel, oil hole

This machined-type needle roller bearing includes an inner ring and fits compact transmissions, actuators and linear slide units where radial space is limited.

✅ Model: NA4909 (NA49 Metric Series), caged machined type
✅ Inner ring included, open enclosure with oil holes for lubrication
✅ Dynamic load capacity 43500 N, static load capacity 73300 N
✅ Maximum speed 7500 rpm, high-carbon steel construction, weight ~1.0 lb each
✅ Dimensions: 45 mm ID x 68 mm OD x 22 mm width, single bearing pack

💡 What is a needle roller bearing used for in linear slide units and compact machinery?
Needle roller bearings are handy when you need a thin cross-section with strong radial load support.
- Ideal for tight-space linear slide unit guides, cam followers, and compact gearboxes.
- Choose over a sealed ball bearing when slimmer profiles and higher load capacity matter.
- Consider ceramic rollers or hybrid systems for higher rpm or lower friction needs.