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

NSK Bearings Spherical Roller Bearings 21312

Product Overview

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Spherical Roller Bearings/Bearings

21312

Spherical Roller Bearing

Bore d60 mm
Width B31 mm

Product Features

NSK spherical roller bearing (21312 series), model 21312: 60 mm bore, 130 mm OD, 31 mm width, cylindrical bore (no K)
Basic dynamic load rating Cr 238 kN, basic static load rating C0r 244 kN (NSK official catalog; current-generation equivalent 21312EAE4, Cr/C0r figures above are taken from that higher-capacity current design)
Thermal speed rating approx. 4800 min⁻¹, limiting speed (grease) approx. 3800 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	21312
Series	-	21312 series
Bore d	mm	60
Outer diameter D	mm	130
Width B	mm	31
Min. chamfer r	mm	2.1
Bore type	-	cylindrical bore (no K)
Basic dynamic load rating Cr	kN	238
Basic static load rating C0r	kN	244
Thermal speed rating	min⁻¹	4800
Limiting speed (grease)	min⁻¹	3800

Product Description

The 21312 is an NSK spherical roller bearing from the 21312 series: 60 mm bore, 130 mm outer diameter, 31 mm width, cylindrical bore (no K). Basic dynamic load rating Cr is 238 kN and basic static load rating C0r is 244 kN (NSK official catalog CAT. No. E1103d; current-generation equivalent 21312EAE4, 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.