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

NSK Bearings Spherical Roller Bearings 21318

Product Overview

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Spherical Roller Bearings/Bearings

21318

Spherical Roller Bearing

Bore d90 mm
Width B43 mm

Product Features

NSK spherical roller bearing (21318 series), model 21318: 90 mm bore, 190 mm OD, 43 mm width, cylindrical bore (no K)
Basic dynamic load rating Cr 415 kN, basic static load rating C0r 450 kN (NSK official catalog; current-generation equivalent 21318EAE4, Cr/C0r figures above are taken from that higher-capacity current design)
Thermal speed rating approx. 3600 min⁻¹, limiting speed (grease) approx. 2800 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	21318
Series	-	21318 series
Bore d	mm	90
Outer diameter D	mm	190
Width B	mm	43
Min. chamfer r	mm	3
Bore type	-	cylindrical bore (no K)
Basic dynamic load rating Cr	kN	415
Basic static load rating C0r	kN	450
Thermal speed rating	min⁻¹	3600
Limiting speed (grease)	min⁻¹	2800

Product Description

The 21318 is an NSK spherical roller bearing from the 21318 series: 90 mm bore, 190 mm outer diameter, 43 mm width, cylindrical bore (no K). Basic dynamic load rating Cr is 415 kN and basic static load rating C0r is 450 kN (NSK official catalog CAT. No. E1103d; current-generation equivalent 21318EAE4, 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.