Single machined NA4904UU NA49 needle roller, 20 mm ID x 37 mm OD x 17 mm width, high carbon steel, oil hole, sealed with inner ring, caged metric bearing, ideal for linear slide unit and shafts

Single NA4904UU machined needle bearing, sealed
✔️ 20 mm ID x 37 mm OD x 17 mm width, high carbon steel, oil hole

This machined NA4904UU needle roller bearing is sold as a single unit with seals and an inner ring. It’s commonly used in linear slide units, compact shafts, transmissions and other tight applications that need strong radial support.

✅ Model: NA4904UU, NA49 metric series
✅ Inner diameter 20 mm, outer diameter 37 mm, width 17 mm
✅ Material: high carbon steel, caged machined construction
✅ Dynamic load capacity 18000 N, static load capacity 20500 N
✅ Max speed 8500 rpm, includes oil hole for lubrication
✅ Enclosure: synthetic rubber seals, inner ring included, sealed unit
✅ Sold as a single bearing, weight approx 1.0 lb each

💡 What is a sealed needle roller bearing used for in linear slide units and shafts? A sealed needle roller bearing is a handy option when you need a compact, high-capacity radial support with low maintenance. - Ideal for supporting high radial loads in confined assemblies like linear slide unit and shaft applications - The sealed design retains lubricant and keeps contamination out, similar to a sealed ball bearing for longer service life - Preferred over ceramic bearings when impact resistance and cost are priorities; ceramic options are chosen for very low friction or high temperature needs