Inner Ring IRT815 metric needle roller inner race 8 mm ID x 12 mm OD x 15.5 mm W shell-type high carbon steel single piece 1 count fits TA1215Z for linear slide units sealed ball bearing assemblies

Single IRT815 inner ring, metric 8 x 12 x 15.5 mm race
✔️ 8 mm ID, 12 mm OD, 15.5 mm width; for TA1215Z assembly, 1 pc

This metric inner ring (inner race) is a single-piece component for shell-type needle roller bearings, typically used in transmissions, gearboxes, and linear slide units where compact radial support is needed.

✅ Series: IRT (model IRT815)
✅ Dimensions: 8 mm ID x 12 mm OD x 15.5 mm width
✅ Material: high carbon steel inner race for shell-type needle roller bearings
✅ Compatibility: fits TA1215Z shell assemblies; works well with sealed ball bearing setups and linear slide units
✅ Pack: 1 piece (single inner ring); approx weight 0.02 lb

💡 What is an inner ring for a needle roller bearing used for in mechanical assemblies? An inner ring gives a hardened running surface and precise fit for needle rollers, helping ensure reliable radial support and long service life. - Provides accurate radial guidance and even load distribution for needle roller elements, improving bearing life - Keeps assemblies compact for tight spaces like gearboxes, transmissions, and linear slide units - Enables integration with sealed ball bearing arrangements and preserves lubrication paths for better performance