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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 6221

Product Overview

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Deep Groove Ball Bearings/Bearings

6221

Deep Groove Ball Bearing

NSK Distributor Taiwan

Bore d105 mm
Width B36 mm

Product Features

NSK deep groove ball bearing (6221 series), model 6221: 105 mm bore, 190 mm outer diameter, 36 mm width, open type (no shield, no seal)
Basic dynamic load rating Cr 146 kN, basic static load rating C0r 105 kN (NSK official catalog CAT. No. E1103d)
Limiting speed approx. 3800 min⁻¹ (grease), 4500 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 6221 is an NSK deep groove ball bearing from the 6221 series: 105 mm bore, 190 mm outer diameter, 36 mm width, open type (no shield, no seal). Basic dynamic load rating Cr is 146 kN and basic static load rating C0r is 105 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	6221
Series	-	6221 series
Bore d	mm	105
Outer diameter D	mm	190
Width B	mm	36
Min. chamfer r	mm	2.1
Seal / shield	-	open type (no shield, no seal)
Basic dynamic load rating Cr	kN	146
Basic static load rating C0r	kN	105
Limiting speed (grease)	min⁻¹	3800
Limiting speed (oil)	min⁻¹	4500

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 6221 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 6221 to your inquiry list or give us a call, and we'll confirm stock, lead time and quote.