Needle Roller Bearing Inner Ring

Meta Description: High precision needle roller bearing inner ring, IR, NA, NKI, STO, NATV series in stock. Hardened steel inner sleeve for industrial machinery, fast shipping.

Overview

Needle roller bearing inner ring is a precision hardened inner sleeve designed for matching needle roller bearings and track roller bearings. It provides a smooth and hard rolling raceway when the main shaft cannot be heat-treated or precision ground. This bearing inner ring effectively reduces friction, improves radial load capacity, and extends the service life of the entire bearing system.

Manufactured from high quality GCr15 bearing steel, our needle bearing inner rings undergo integral quenching and precision grinding. With stable dimensional accuracy, high hardness and excellent wear resistance, these inner rings are widely used for heavy load and compact space industrial equipment.

Product Features

Our needle roller bearing inner rings adopt standardized industrial design. Hardened surface reaches HRC 60-64 to ensure long term stable operation. P0 standard precision is available, and P6, P4 high precision grades can be customized. All inner rings are separable and easy to install, replace and maintain. Complete standard sizes are in stock to support fast delivery and small batch wholesale.

Available Models

IR Series Inner Ring: IR101412, IR121616, IR151916, IR202520, IR253020, IR303520, IR404822, IR505822

NA Series Matching Inner Ring: NA4904, NA4905, NA4906, NA4908, NA4910, NA5907, NA6909

NKI Series Inner Sleeve: NKI12/16, NKI15/20, NKI20/30, NKI25/30, NKI30/40, NKI35/40

STO NATV Track Roller Inner Ring: STO6, STO8, STO10, RSTO12, NATV15, NATV20, NATR25

Applications

Needle roller bearing inner rings are commonly applied in automotive gearboxes, starter motors, conveyor systems, agricultural machines, textile equipment, hydraulic pumps, printing machinery and other industrial transmission devices.

Specification

Material: GCr15 Bearing Steel
Precision Grade: P0, P6, P4
Hardness: HRC 60-64
Working Temperature: -30℃ to 120℃
Custom Service: Non-standard size inner ring available