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

NSK Bearings Spherical Roller Bearings 21309

Product Overview

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Spherical Roller Bearings/Bearings

21309

Spherical Roller Bearing

Bore d45 mm
Width B25 mm

Product Features

NSK spherical roller bearing (21309 series), model 21309: 45 mm bore, 100 mm OD, 25 mm width, cylindrical bore (no K)
Basic dynamic load rating Cr 149 kN, basic static load rating C0r 144 kN (NSK official catalog; current-generation equivalent 21309EAE4, Cr/C0r figures above are taken from that higher-capacity current design)
Thermal speed rating approx. 6000 min⁻¹, limiting speed (grease) approx. 5000 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	21309
Series	-	21309 series
Bore d	mm	45
Outer diameter D	mm	100
Width B	mm	25
Min. chamfer r	mm	1.5
Bore type	-	cylindrical bore (no K)
Basic dynamic load rating Cr	kN	149
Basic static load rating C0r	kN	144
Thermal speed rating	min⁻¹	6000
Limiting speed (grease)	min⁻¹	5000

Product Description

The 21309 is an NSK spherical roller bearing from the 21309 series: 45 mm bore, 100 mm outer diameter, 25 mm width, cylindrical bore (no K). Basic dynamic load rating Cr is 149 kN and basic static load rating C0r is 144 kN (NSK official catalog CAT. No. E1103d; current-generation equivalent 21309EAE4, 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.