Needle roller inner ring LRTZ708031, 70 mm ID x 80 mm OD x 31 mm width, metric high-carbon steel race for RNA4914UU assembly, general use, compatible with linear slide units, single unit

LRTZ708031 needle inner ring, 70×80×31 mm
✔️ Single unit, high-carbon steel; fits RNA4914UU; metric

This machined needle roller inner ring is a single unit inner race used to assemble with RNA4914UU needle roller bearings. It’s typically found in linear slide units, gearboxes, and general-purpose industrial machinery where a compact hardened raceway is handy.

✅ Model: LRTZ708031 (Metric LRTZ series)
✅ Bore (ID): 70 mm; Outside Dia (OD): 80 mm; Width: 31 mm
✅ Material: high carbon steel; machined inner race; no oil hole
✅ Fits RNA4914UU needle roller bearings; ideal for linear slide units
✅ Single piece; weight ~0.610 lb; SKU 862378; general-use inner ring

💡 What is an inner ring used for in needle roller bearings and linear slide units? An inner ring gives the rollers a hardened running surface and keeps them aligned so the assembly handles radial loads smoothly. Here's a quick summary: - Provides a hardened raceway to support needle rollers in sealed ball bearing and roller assemblies - Maintains alignment and load distribution in compact linear slide units and gearboxes - Works with ceramic or steel rollers for extended life; handy for tight-fit applications