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

NSK Bearings Spherical Roller Bearings 21306K

Product Overview

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Spherical Roller Bearings/Bearings

21306K

Spherical Roller Bearing

Bore d30 mm
Width B19 mm

Product Features

NSK spherical roller bearing (21306 series), model 21306K: 30 mm bore, 72 mm OD, 19 mm width, tapered bore (K, 1:12 taper)
Basic dynamic load rating Cr 55 kN, basic static load rating C0r 54 kN (NSK official catalog; current-generation equivalent 21306CDKE4, 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

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Product Specifications

Specification	Unit	21306K
Series	-	21306 series
Bore d	mm	30
Outer diameter D	mm	72
Width B	mm	19
Min. chamfer r	mm	1.1
Bore type	-	tapered bore (K, 1:12 taper)
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 21306K is an NSK spherical roller bearing from the 21306 series: 30 mm bore, 72 mm outer diameter, 19 mm width, tapered bore (K, 1:12 taper). 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 21306CDKE4, 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.