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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

NSK Distributor Taiwan

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 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.

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

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 NU311W 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 NU311W to your inquiry list or give us a call, and we'll confirm stock, lead time and quote.