Single Needle Roller Bearing NA4904 Machined Type, 20 mm ID x 37 mm OD x 17 mm Width, Caged High-Carbon Steel with Oil Holes and Inner Ring, NA49 Series, 21000 N Dynamic, 16000 rpm

Single machined needle roller bearing NA4904, 20×37×17 mm
✔️ 20 mm ID, 37 mm OD, 17 mm W; caged, oil-hole, high carbon steel

This single machined needle roller bearing is designed for compact industrial shafts and linear slide unit guides where high radial load capacity and oil-hole lubrication are required.

✅ Type: Caged machined needle bearing, NA49 Metric Series
✅ Inner ring included with oil holes for easy lubrication
✅ Material: high carbon steel; dynamic load 21000 N, static 25000 N
✅ Max speed 16000 rpm; suited for linear slide unit, gearboxes, pumps
✅ Single bearing pack, model NA4904; weight ~1.0 lb; SKU 1912001

💡 What is a needle roller bearing used for? Needle roller bearings provide high radial load capacity in tight spaces, perfect for compact shafts and guides. - Great where a sealed ball bearing would be too bulky or a ceramic option is chosen for low friction - Commonly used in transmissions, pumps, gearboxes, and linear slide unit applications needing oil-hole lubrication - Pick machined inner-ring caged types when accurate shaft alignment and serviceable lubrication are needed