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

NSK Bearings Cylindrical Roller Bearings NU311W

Product Overview

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Cylindrical Roller Bearings/Bearings

NU311W

Cylindrical Roller Bearing

Bore d55 mm
Width B29 mm

Product Features

NSK cylindrical roller bearing (NU311 series), model NU311W: 55 mm bore, 120 mm OD, 29 mm width, NU type, W pressed-steel cage
Basic dynamic load rating Cr 169 kN, basic static load rating C0r 143 kN (NSK official catalog; current-generation equivalent NU311E, Cr/C0r figures above are taken from that higher-capacity current design)
Limiting speed approx. 4500 min⁻¹ (grease), 5600 min⁻¹ (oil)
no ribs on inner ring, two ribs on outer ring; inner ring can float axially, no axial load capacity; line contact between rollers and raceways gives high radial load capacity and low friction, suited to high-speed 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	NU311W
Series	-	NU311 series (NU type)
Bore d	mm	55
Outer diameter D	mm	120
Width B	mm	29
Min. chamfer r	mm	2
Cage	-	W (pressed steel)
Basic dynamic load rating Cr	kN	169
Basic static load rating C0r	kN	143
Limiting speed (grease)	min⁻¹	4500
Limiting speed (oil)	min⁻¹	5600

Product Description

The NU311W is an NSK cylindrical roller bearing from the NU311 series (NU type): 55 mm bore, 120 mm outer diameter, 29 mm width, W pressed-steel cage. Basic dynamic load rating Cr is 169 kN and basic static load rating C0r is 143 kN (NSK official catalog CAT. No. E1103d; current-generation equivalent NU311E, Cr/C0r figures above are taken from that higher-capacity current design). Cylindrical roller bearings use line contact between rollers and raceways for high radial load capacity and low friction — suited to high-speed, heavy-duty drives such as gear reducers, motors and machine-tool spindles.

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.