Inner Ring IRT1222 Metric 12 mm ID x 15 mm OD x 22.5 mm Width for Shell-Type Needle Roller, Tapered Bore, High Carbon Steel, Fits TLA1522Z Assembly (1pc)

Metric inner ring IRT1222 for shell-type bearings
✔️ 12 mm ID x 15 mm OD x 22.5 mm W, high carbon steel, 1pc, fits TLA1522Z

This single inner ring (IRT1222) is a high carbon steel raceway part for shell-type needle roller bearing assemblies, commonly used in linear slide units, compact gearboxes and transmission components.

✅ Model: IRT1222, Metric series, tapered bore, fits TLA1522Z
✅ Dimensions: 12 mm ID x 15 mm OD x 22.5 mm width
✅ Material: high carbon steel, not ceramic, single piece (1pc)
✅ Application: shell-type needle roller assemblies, linear slide units, gearboxes
✅ Note: not a sealed ball bearing; inner ring only, weight ~0.020 lb each

💡 What is an inner ring used for in a shell-type needle roller bearing assembly? An inner ring supplies a hardened raceway and precise shaft seating so needle rollers carry radial loads reliably. Short intro sentence: - Provides the raceway surface for needle rollers, ideal for linear slide units and slim gearbox designs - Works with tapered bores and shell housings to ensure correct mounting and preload with assemblies like TLA1522Z - A compact steel option that is not a replacement for sealed ball bearing units or ceramic parts when sealing or high-temp performance is required