Koyo (JTEKT) 32309JR – Single Row Tapered Roller Bearing

General Information

• Brand: Koyo (JTEKT)
• Item Number: 32309JR
• EAN: 4549250124952
• Category: Single Row Tapered Roller Bearing
• Country of Origin: Japan
• Dimensions:
• Inner dimension: 45,000 mm

Suffix Description

• J – Tapered roller bearing conforming to ISO R355 (metric series)
• R – Internal design code indicating high load capacity (e.g. 30206JR)

Product Description

The Koyo 32309JR is a single-row tapered roller bearing designed to support combined loads, meaning high radial loads together with axial loads in one direction.

Tapered roller bearings take their name from the tapered rollers running between conical raceways in the inner and outer rings. This geometry creates a contact angle between the rollers and raceways. The greater the contact angle, the higher the axial load capacity, making this type of bearing ideal for applications where both radial and axial forces are present.

The bearing consists of two main components:

• Cone assembly: inner ring with cage and tapered rollers
• Cup: outer ring

Because the cup and cone are separable, the 32309JR is:

• Easy to mount and dismount
• Convenient to inspect and replace
• Suitable for accurate adjustment of internal clearance or preload

Single-row tapered roller bearings have an open design. Due to their internal construction, they are typically used in pairs, installed in:

• X-arrangement (back-to-back)
• O-arrangement (face-to-face)
• Tandem arrangement

This paired mounting allows the bearing set to:

• Support axial loads from both directions
• Provide stiffness and precise axial location
• Be tuned for the correct preload or clearance in the application

Key Features

• Single-row tapered roller bearing, metric series
• High radial and axial load capacity in one direction
• High-load internal design (“R” code)
• Cup and cone separable for easy installation and maintenance
• Suitable for paired use (X, O, or tandem)
• Quality Koyo (JTEKT) product made in Japan

   PACKAGE INCLUDES: ONE (1) Koyo Bearing 32309 JR