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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

NSK Distributor Taiwan

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 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.

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

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 N311W 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 N311W to your inquiry list or give us a call, and we'll confirm stock, lead time and quote.

Series Models

Cylindrical Roller Bearings・N311 series (N type)

N218W N219W N220W N304W N305W N306W N307W N308W N309W N310WN311W（This page）N312W N313W N314W N315W N316W N317W N318W N319W N320W NF204W

View All Cylindrical Roller Bearings Models →