Description:
Koyo (JTEKT) Tapered Roller Bearing – 30303JR

Type: Single Row Tapered Roller Bearing (Metric)
Country of Origin: Japan
EAN: 3663952475592

Product Information

Brand: Koyo (JTEKT)
Item Number: 30303JR
Category: Tapered Roller Bearing – Single Row
Precision: Standard Precision
Dimensions & Weight

Metric

Bore (d): 17 mm
Outside Diameter (D): 47 mm
Width (B): 15.25 mm
Weight: 0.13 kg
Imperial

Bore (d): 0.6693 in
Outside Diameter (D): 1.8504 in
Width (B): 0.6004 in
Performance / Ratings

Basic Dynamic Load Rating (Cr): 34.2 kN
Basic Static Load Rating (C0r): 24.5 kN
Fatigue Load Limit (Cu): 3.45 kN
Limiting Speed (Grease): 9,200 rpm
Limiting Speed (Oil): 12,000 rpm
Internal Geometry Factors

Load Center Spread (a): 11.0 mm
Constant (e): 0.29
Axial Load Factor (Y1): 2.11
Axial Load Factor (Y0): 1.16
Mounting / Abutment Dimensions

da (min): 22.5 mm
db (max): 25 mm
Da (max): 41.5 mm
Da (min): 40 mm
Db (min): 42 mm
Sa (min): 2 mm
Sb (min): 3 mm
r1 (min): 1 mm
ra (max): 1 mm
rb (max): 1 mm
Suffix Definitions

J: Tapered roller bearing conforming to ISO R355 (sub-unit, metric series)
R: Internal design code (high load capacity)
Product Description

The Koyo 30303JR is a single-row tapered roller bearing designed to support combined radial and axial loads (axial load in one direction). The bearing consists of two separable components: the cone (inner ring with rollers and cage) and the cup (outer ring), making it easy to assemble and service. Single-row tapered bearings are typically installed in pairs (mirror-image) to handle axial loads in both directions, with common arrangements including X, O, or tandem setups.

PACKAGE INCLUDES: ONE (1) KOYO Bearing 30303 JR