Single IRB88-1 Tapered Inner Ring for Shell-Type Needle Roller Bearings, I.D. 1/2 in (12.70 mm), O.D. 3/4 in (19.05 mm), Width 13.08 mm (0.516 in) Compatible with BA128Z YB128

Single IRB88-1 Tapered Inner Ring, Needle Bearing
✔️ I.D. 1/2 in (12.70 mm) O.D. 3/4 in (19.05 mm) Width 13.08mm (0.516 in)

This is a single tapered inner ring for shell-type needle roller bearings, made of high carbon steel and suited for applications where shaft hardness or finish can't be controlled. Typical uses include industrial gearboxes, pumps, and compact motion units.

✅ Bore type: Tapered inner diameter for press fit and alignment.
✅ Material: High carbon steel raceway for toughness and wear resistance.
✅ Size: I.D. 1/2 in (12.70 mm), O.D. 3/4 in (19.05 mm), Width 13.08 mm (0.516 in).
✅ Series: IRB Inch Series, model IRB88-1 for shell-type needle bearings.
✅ Compatibility: Fits BA128Z and YB128 shell-type needle roller bearings.
✅ Feature: No oil hole; economical alternative to bushings, reduces shaft wear.

💡 What is an inner ring used for with shell-type needle roller bearings? A clear, short answer up front. - Provides a hardened running surface when shafts aren’t machined to specific hardness, protecting against premature shaft wear. - Offers reliable roller support in compact arrangements like linear slide units and small gearbox assemblies. - Handy when comparing to sealed ball bearing or ceramic options for tight radial loads and constrained spaces.