Inner ring for shell-type needle roller bearing, metric 40 mm ID x 45 mm OD x 20.5 mm width, high-carbon steel, fits TA/TLA/YT4520 series, single unit for linear slide and sealed ball bearing use

Single inner ring for shell-type needle bearing
✔️ 40 mm ID x 45 mm OD x 20.5 mm W; high-carbon steel; fits TA/TLA/YT4520

This single inner ring is the replacement inner race for shell-type needle roller bearings, commonly used in compact housings, linear slide systems, and sealed bearing setups. It's designed to assemble with TA4520Z, TLA4520Z and YT4520 series for reliable radial support.

✅ Model: IRT4020 inner ring for shell-type needle roller bearings
✅ Dimensions: 40 mm ID × 45 mm OD × 20.5 mm width
✅ Material: high-carbon steel, metric IRT series, tapered bore option
✅ Fits with: TA4520Z, TLA4520Z and YT4520 tapered sleeves and shells
✅ Typical use: linear slide unit and sealed ball bearing housings
✅ Pack: single inner ring sold individually; weight approx 0.120 lb; SKU 861258

💡 What is an inner ring used for in a needle roller bearing assembly? An inner ring gives the rollers a hardened raceway and helps locate the bearing in the housing. - It provides the running surface the needle rollers ride on, improving load sharing in linear slide unit and sealed ball bearing setups. - It maintains alignment and reduces wear, which makes installation and replacement handy when paired with tapered sleeves. - Choosing the right inner ring for TA/TLA/YT4520-style shells speeds assembly and preserves clearance consistency.