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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 7308BW

Product Overview

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Angular Contact Ball Bearings/Bearings

7308BW

Angular Contact Ball Bearing

NSK Distributor Taiwan

Bore d40 mm
Width B23 mm

Product Features

NSK angular contact ball bearing, single-row 7308 series, model 7308BW: 40 mm bore, 90 mm OD, 23 mm width, 40° contact angle, W pressed-steel cage
Basic dynamic load rating Cr 55.5 kN, basic static load rating C0r 33 kN (NSK official catalog; current-generation equivalent 7308BEAW, Cr/C0r figures above are taken from that higher-capacity current design)
Limiting speed approx. 5000 min⁻¹ (grease), 6700 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 7308BW is an NSK angular contact ball bearing from the single-row 7308 series: 40 mm bore, 90 mm outer diameter, 23 mm width, 40° contact angle, W pressed-steel cage. Basic dynamic load rating Cr is 55.5 kN and basic static load rating C0r is 33 kN (NSK official catalog CAT. No. E1103d; current-generation equivalent 7308BEAW, 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	7308BW
Series	-	7308 series (single row)
Bore d	mm	40
Outer diameter D	mm	90
Width B	mm	23
Min. chamfer r	mm	1.5
Contact angle	-	40°
Cage	-	W (pressed steel)
Basic dynamic load rating Cr	kN	55.5
Basic static load rating C0r	kN	33
Limiting speed (grease)	min⁻¹	5000
Limiting speed (oil)	min⁻¹	6700

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 7308BW 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 7308BW to your inquiry list or give us a call, and we'll confirm stock, lead time and quote.

Series Models

Angular Contact Ball Bearings・7308 series (single row)

7218BW 7219BW 7220BW 7301BW 7302BW 7303BW 7304BW 7305BW 7306BW 7307BW7308BW（This page）7309BW 7310BW 7311BW 7312BW 7313BW 7314BW 7315BW 7316BW 7317BW 7318BW

View All Angular Contact Ball Bearings Models →