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

NSK Bearings Spherical Roller Bearings 21308

Product Overview

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Spherical Roller Bearings/Bearings

21308

Spherical Roller Bearing

Bore d40 mm
Width B23 mm

Product Features

NSK spherical roller bearing (21308 series), model 21308: 40 mm bore, 90 mm OD, 23 mm width, cylindrical bore (no K)
Basic dynamic load rating Cr 118 kN, basic static load rating C0r 111 kN (NSK official catalog; current-generation equivalent 21308EAE4, Cr/C0r figures above are taken from that higher-capacity current design)
Thermal speed rating approx. 6700 min⁻¹, limiting speed (grease) approx. 6000 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	21308
Series	-	21308 series
Bore d	mm	40
Outer diameter D	mm	90
Width B	mm	23
Min. chamfer r	mm	1.5
Bore type	-	cylindrical bore (no K)
Basic dynamic load rating Cr	kN	118
Basic static load rating C0r	kN	111
Thermal speed rating	min⁻¹	6700
Limiting speed (grease)	min⁻¹	6000

Product Description

The 21308 is an NSK spherical roller bearing from the 21308 series: 40 mm bore, 90 mm outer diameter, 23 mm width, cylindrical bore (no K). Basic dynamic load rating Cr is 118 kN and basic static load rating C0r is 111 kN (NSK official catalog CAT. No. E1103d; current-generation equivalent 21308EAE4, 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.