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

NSK Bearings Deep Groove Ball Bearings 6308

Product Overview

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Deep Groove Ball Bearings/Bearings

6308

Deep Groove Ball Bearing

NSK Distributor Taiwan

Bore d40 mm
Width B23 mm

Product Features

NSK deep groove ball bearing (6308 series), model 6308: 40 mm bore, 90 mm outer diameter, 23 mm width, open type (no shield, no seal)
Basic dynamic load rating Cr 45 kN, basic static load rating C0r 24 kN (NSK official catalog CAT. No. E1103d)
Limiting speed approx. 9000 min⁻¹ (grease), 11000 min⁻¹ (oil)
Simple, low-friction, high-speed design carrying radial load plus moderate bidirectional axial load — the most widely used bearing type
Nahshon is NSK's distributor in Taiwan — add the part number to your inquiry list for a direct quote

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Product Description

The 6308 is an NSK deep groove ball bearing from the 6308 series: 40 mm bore, 90 mm outer diameter, 23 mm width, open type (no shield, no seal). Basic dynamic load rating Cr is 45 kN and basic static load rating C0r is 24 kN (NSK official catalog CAT. No. E1103d). Deep groove ball bearings are simple, low-friction and capable of high speeds while carrying both radial and moderate bidirectional axial loads — the most widely used bearing type, common in motors, gear reducers, pumps, fans and general machinery.

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	6308
Series	-	6308 series
Bore d	mm	40
Outer diameter D	mm	90
Width B	mm	23
Min. chamfer r	mm	1.5
Seal / shield	-	open type (no shield, no seal)
Basic dynamic load rating Cr	kN	45
Basic static load rating C0r	kN	24
Limiting speed (grease)	min⁻¹	9000
Limiting speed (oil)	min⁻¹	11000

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 6308 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 6308 to your inquiry list or give us a call, and we'll confirm stock, lead time and quote.