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

NSK Bearings Spherical Roller Bearings 21318K

Product Overview

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Spherical Roller Bearings/Bearings

21318K

Spherical Roller Bearing

Bore d90 mm
Width B43 mm

Product Features

NSK spherical roller bearing (21318 series), model 21318K: 90 mm bore, 190 mm OD, 43 mm width, tapered bore (K, 1:12 taper)
Basic dynamic load rating Cr 415 kN, basic static load rating C0r 450 kN (NSK official catalog; current-generation equivalent 21318EAKE4, 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	21318K
Series	-	21318 series
Bore d	mm	90
Outer diameter D	mm	190
Width B	mm	43
Min. chamfer r	mm	3
Bore type	-	tapered bore (K, 1:12 taper)
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 21318K is an NSK spherical roller bearing from the 21318 series: 90 mm bore, 190 mm outer diameter, 43 mm width, tapered bore (K, 1:12 taper). 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 21318EAKE4, 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.