Single tapered inner ring IRB812-1 for shell-type needle roller bearings, 1/2 in (12.7 mm) I.D., 3/4 in (19.05 mm) O.D., 19.43 mm (0.764 in) width, high carbon steel, fits BA1212Z YB1212

Single tapered inner ring 1/2 in (12.7 mm) I.D.
✔️ High carbon steel; O.D. 3/4 in (19.05 mm); width 19.43 mm (0.764 in)

This inner ring is a precision raceway insert for shell-type needle roller bearings, used when shafts can't be hardened or finished to bearing tolerances. Ideal for industrial repair, retrofits, and maintenance; sold as a single unit.

✅ Series: IRB812-1 / IR-812
✅ Bore (I.D.): 1/2 in (12.7 mm)
✅ O.D.: 3/4 in (19.05 mm)
✅ Width: 19.43 mm (0.764 in)
✅ Material: high carbon steel; no oil hole
✅ Fits: BA1212Z / BHA1212Z and YB1212 shell-type needle roller bearings; sold each

💡 What is an inner ring for shell-type needle roller bearings used for? Inner rings provide a hardened, accurate raceway when shafts can’t meet hardness or surface specs. - They protect shafts from premature wear and allow shell-type needle roller bearings to operate smoothly. - Handy for maintenance, retrofit work, and linear slide unit assemblies where sealed ball bearing or ceramic solutions aren’t suitable. - They eliminate extra shaft machining and simplify bearing replacement and assembly.