KOYO NJ304R Cylindrical Roller Bearing 20 × 52 × 15 mm

Cylindrical Roller Bearing

RFQ

In stock

EX-WORKS (Incoterms 2020) Seoul, Korea — Buyer arranges freight, duties, and insurance.

Category: Cylindrical Roller Bearing
Bore: 20 mm
Outer Ø: 52 mm
Width: 15 mm

Overview

KOYO NJ304R Cylindrical Roller Bearing is designed for high radial load capacity through line contact between rollers and raceways. It is suitable for rigid, heavy-duty applications such as motors, gearboxes, rolling mills, and machine tools, with N, NU, NJ, and NUP designs offering different axial locating functions.

Cylindrical rollers and a cage are arranged between inner and outer ring raceways. Depending on flange configuration, the bearing can be separable and may support axial load in one or both directions.

Key features

High radial load capacity
Rigid performance for high-speed operation
Separable design for easier mounting
Axial locating capability by design variant

Typical applications

Industrial electric motors
Gearboxes and reducers
Machine tool spindle support positions
Rolling mills, paper machines, and heavy machinery

Selection guidance

Choose the N, NU, NJ, or NUP design by load direction, axial locating requirement, cage material, internal clearance, and lubrication condition.

Symbol	Value	Description
≈m	0.158 kg	Weight
Cr	39.4 kN	Basic dynamic load rating, radial
C_0r	26.9 kN	Basic static load rating, radial
C_ur	3.75 kN	Fatigue load limit, radial
n_G	16,000 rpm	Limiting speed
n_ϑr	12,000 rpm	Reference speed

Symbol	Value	Description
d	20 mm	Bore diameter
D	52 mm	Outside diameter
B	15 mm	Width

Symbol	Value	Description
T_min	-20 °C	Operating temperature min.
T_max	120 °C	Operating temperature max.

Code	Description
P0	Tolerance class
Copper cage	Cage
Cylindrical bore	Bore type

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