Needle roller bearing inner ring, single unit, metric 300 mm ID x 330 mm OD x 80 mm W, high carbon steel, general purpose, fits RNA4860 needle roller assembly, linear slide unit compatible

Single needle roller inner ring, metric 300/330/80
✔️ 300 mm ID x 330 mm OD x 80 mm W; high carbon steel; fits RNA4860

This single inner ring is a metric needle roller bearing component for linear slide units and industrial machinery; typically used in gearboxes, conveyors, and rotary shafts.

✅ Bore (ID): 300 mm
✅ Outside diameter (OD): 330 mm
✅ Width: 80 mm
✅ Material: 高炭素鋼
✅ Fits with: RNA4860 needle roller assembly
✅ Pack: single inner ring, sold each

💡 What is an inner ring used for in needle roller bearing assemblies? An inner ring creates a hardened raceway and helps transfer radial loads reliably in needle roller setups. Quick intro: - Provides a hardened raceway for needle rollers, improving life in sealed ball bearing or open assemblies. - Keeps concentric fit on the shaft for smooth operation in linear slide unit and gearbox applications. - Enables proper assembly with RNA4860 style cages and supports compact machinery load handling.