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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

NSK Distributor Taiwan

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 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.

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

FAQ

What's the difference between the Z, ZZ and DDU suffixes?

Z means a single-side steel shield, ZZ means steel shields on both sides, and DDU means contact rubber seals on both sides. Shields suit general environments and high speeds; rubber seals give better dust and water protection with slightly higher friction torque — choose based on your dust exposure and lubrication method.

When should I choose C3 clearance instead of standard clearance?

For motors or other applications with noticeable temperature rise, or high-speed operation, the inner ring expands from heat and reduces the clearance — choose C3 in that case. Standard clearance is fine for general room-temperature, low-speed use. See Nahshon's technical resources for a clearance selection guide.

Is 21318K in stock in Taiwan? What is the lead time?

Nahshon is the NSK distributor in Taiwan and keeps stock of some commonly used items. Add 21318K to your inquiry list or give us a call, and we'll confirm stock, lead time and quote.

Series Models

Spherical Roller Bearings・21318 series

21313K 21314 21314K 21315 21315K 21316 21316K 21317 21317K 2131821318K（This page）22205 22206 22206K 22207 22207K 22208 22208K 22209 22209K 22210

View All Spherical Roller Bearings Models →