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

NSK Bearings Angular Contact Ball Bearings 7311BW

Product Overview

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Angular Contact Ball Bearings/Bearings

7311BW

Angular Contact Ball Bearing

NSK Distributor Taiwan

Bore d55 mm
Width B29 mm

Product Features

NSK angular contact ball bearing, single-row 7311 series, model 7311BW: 55 mm bore, 120 mm OD, 29 mm width, 40° contact angle, W pressed-steel cage
Basic dynamic load rating Cr 93.5 kN, basic static load rating C0r 58.5 kN (NSK official catalog; current-generation equivalent 7311BEAW, Cr/C0r figures above are taken from that higher-capacity current design)
Limiting speed approx. 3600 min⁻¹ (grease), 5000 min⁻¹ (oil)
Carries radial load plus axial load in one direction; two or more bearings are matched (DB/DF/DT) for bidirectional loading
Nahshon is NSK's distributor in Taiwan — add the part number to your inquiry list

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Product Description

The 7311BW is an NSK angular contact ball bearing from the single-row 7311 series: 55 mm bore, 120 mm outer diameter, 29 mm width, 40° contact angle, W pressed-steel cage. Basic dynamic load rating Cr is 93.5 kN and basic static load rating C0r is 58.5 kN (NSK official catalog CAT. No. E1103d; current-generation equivalent 7311BEAW, Cr/C0r figures above are taken from that higher-capacity current design). Angular contact ball bearings carry radial load together with axial load in one direction; because a radial load produces an axial reaction, two or more bearings are typically matched (DB, DF or DT) — common in machine-tool spindles, pumps and precision drives.

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	7311BW
Series	-	7311 series (single row)
Bore d	mm	55
Outer diameter D	mm	120
Width B	mm	29
Min. chamfer r	mm	2
Contact angle	-	40°
Cage	-	W (pressed steel)
Basic dynamic load rating Cr	kN	93.5
Basic static load rating C0r	kN	58.5
Limiting speed (grease)	min⁻¹	3600
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 7311BW 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 7311BW to your inquiry list or give us a call, and we'll confirm stock, lead time and quote.

Series Models

Angular Contact Ball Bearings・7311 series (single row)

7301BW 7302BW 7303BW 7304BW 7305BW 7306BW 7307BW 7308BW 7309BW 7310BW7311BW（This page）7312BW 7313BW 7314BW 7315BW 7316BW 7317BW 7318BW 7319BW 7320BW

View All Angular Contact Ball Bearings Models →