WS5578 Inner Ring for Thrust Roller Bearing, Metric 55 mm ID, 78 mm OD, 5 mm Width, Single Replacement for AZ5578 AZK5578 NTB5578 WS Series, precision for sealed ball bearing and linear slide unit use

WS5578 inner ring 55 mm ID for thrust bearings
✔️ 55 mm ID, 78 mm OD, 5 mm width; single inner ring, WS series

This single WS5578 inner ring is a metric replacement inner race for thrust roller and needle thrust bearings, typically used in linear slide units, gearbox thrust stacks, and sealed ball bearing setups.

✅ Model: WS5578; WS Metric Series
✅ Inner diameter: 55 mm
✅ Outer diameter: 78 mm
✅ Width: 5 mm; single piece pack
✅ Fits AZ5578, AZK5578, NTB5578 thrust bearings
✅ Weight: 0.200 lb; OEM replacement for thrust assemblies

💡 What is a thrust roller bearing inner ring used for in linear slide unit and sealed ball bearing applications? The inner ring provides the hardened raceway that rollers or needles ride on, helping control axial loads and reduce wear. Here’s a short intro, then some handy pointers: - Provides a hardened raceway for axial loads, extending life of sealed ball bearing and ceramic roller systems - Common in linear slide unit carriages, gearbox thrust stacks, and precision machinery where axial positioning matters - Easy single-piece replacement for maintenance to reduce downtime and simplify repairs