L
o
a
d
i
n
g
.
.
.

Product Series of Automation-Related Precision Ball Screws and Linear Rails – High-Precision Ball Screws

NSK Bearings Spherical Roller Bearings 21306

Product Overview

L
o
a
d
i
n
g
.
.
.

Spherical Roller Bearings/Bearings

21306

Spherical Roller Bearing

Bore d30 mm
Width B19 mm

Product Features

NSK spherical roller bearing (21306 series), model 21306: 30 mm bore, 72 mm OD, 19 mm width, cylindrical bore (no K)
Basic dynamic load rating Cr 55 kN, basic static load rating C0r 54 kN (NSK official catalog; current-generation equivalent 21306CDE4, Cr/C0r figures above are taken from that higher-capacity current design)
Thermal speed rating approx. 7500 min⁻¹, limiting speed (grease) approx. 4500 min⁻¹
Double-row rollers on a spherical outer raceway self-align for misalignment and shaft deflection — suited to long shafts and heavy-duty drives
Nahshon is NSK's distributor in Taiwan — add the part number to your inquiry list

Quantity

Quick Inquiry

Call Us Email Us Contact Us About This Product

Product Specifications

Specification	Unit	21306
Series	-	21306 series
Bore d	mm	30
Outer diameter D	mm	72
Width B	mm	19
Min. chamfer r	mm	1.1
Bore type	-	cylindrical bore (no K)
Basic dynamic load rating Cr	kN	55
Basic static load rating C0r	kN	54
Thermal speed rating	min⁻¹	7500
Limiting speed (grease)	min⁻¹	4500

Product Description

The 21306 is an NSK spherical roller bearing from the 21306 series: 30 mm bore, 72 mm outer diameter, 19 mm width, cylindrical bore (no K). Basic dynamic load rating Cr is 55 kN and basic static load rating C0r is 54 kN (NSK official catalog CAT. No. E1103d; current-generation equivalent 21306CDE4, Cr/C0r figures above are taken from that higher-capacity current design). Spherical roller bearings use double-row rollers on a spherical outer raceway that self-aligns for misalignment and shaft deflection while carrying heavy radial and bidirectional axial loads — common in gear reducers, conveyor rollers, paper machinery and wind-turbine main shafts.

Inquiries & customization

Add this part number to your inquiry list — Nahshon is NSK's distributor in Taiwan and works directly with the factory to confirm specifications, stock and pricing.