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

NSK Bearings Cylindrical Roller Bearings N311W

Product Overview

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Cylindrical Roller Bearings/Bearings

N311W

Cylindrical Roller Bearing

Bore d55 mm
Width B29 mm

Product Features

NSK cylindrical roller bearing (N311 series), model N311W: 55 mm bore, 120 mm OD, 29 mm width, N type, W pressed-steel cage
Basic dynamic load rating Cr 136 kN, basic static load rating C0r 111 kN (NSK official catalog)
Limiting speed approx. 4000 min⁻¹ (grease), 5000 min⁻¹ (oil)
no ribs on outer ring, two ribs on inner ring; outer 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	N311W
Series	-	N311 series (N 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	136
Basic static load rating C0r	kN	111
Limiting speed (grease)	min⁻¹	4000
Limiting speed (oil)	min⁻¹	5000

Product Description

The N311W is an NSK cylindrical roller bearing from the N311 series (N type): 55 mm bore, 120 mm outer diameter, 29 mm width, W pressed-steel cage. Basic dynamic load rating Cr is 136 kN and basic static load rating C0r is 111 kN (NSK official catalog CAT. No. E1103d). 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.