Single inner ring for RNA49/32UU needle roller bearing, metric 32 x 40 x 21 mm, machined high carbon steel race for linear slide unit and sealed bearing housings, pack of 1

Single inner ring 32 x 40 x 21 mm, pack of 1
✔️ 32 mm ID, 40 mm OD, 21 mm W, machined high carbon steel, fits RNA49/32UU

This single machined inner ring (inner race) is designed for needle roller bearings and is commonly used in linear slide units, gearboxes, and industrial assemblies where a hardened raceway is needed.

✅ 32 mm ID x 40 mm OD x 21 mm width
✅ Material: machined high carbon steel for wear resistance
✅ Designed to assemble with RNA49/32UU needle roller bearing
✅ Ideal for linear slide unit applications and sealed bearing housings
✅ Sold as a single inner ring replacement part, weight approx 0.160 lb

💡 What is an inner ring used for in a needle roller bearing and when should you replace it? An inner ring provides the hardened raceway for the needle rollers and carries radial loads while helping keep rollers aligned. Quick checks and tips: - Inspect for scoring, pitting, or excessive clearance as common inner race replacement indicators. - Proper inner ring sizing preserves smooth motion in linear slide unit and sealed bearing assemblies. - Replacing a worn inner ring restores bearing life and prevents premature failure.