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

Product Overview

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Thrust Bearings/Bearings

51210

Thrust Ball Bearing

NSK Distributor Taiwan

Height T22 mm

Product Features

NSK thrust ball bearing, single-direction 51210 series, model 51210: 50 mm shaft-washer bore, 78 mm housing-washer OD, 22 mm height, flat seat
Basic dynamic load rating Ca 49 kN, basic static load rating C0a 111 kN (NSK official catalog CAT. No. E1103d)
Limiting speed approx. 2400 min⁻¹ (grease), 3600 min⁻¹ (oil)
Carries pure axial load in one direction only — no radial capacity; shaft washer and housing washer must not be reversed
Nahshon is NSK's distributor in Taiwan — add the part number to your inquiry list

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Product Description

The 51210 is an NSK thrust ball bearing from the single-direction 51210 series, standard flat-seat type: 50 mm shaft-washer bore, 78 mm housing-washer outer diameter, 22 mm height. Basic dynamic load rating Ca is 49 kN and basic static load rating C0a is 111 kN (NSK official catalog CAT. No. E1103d). Thrust ball bearings carry pure axial load in one direction only — no radial capacity — and are common in worm-gear reducers, screw jacks and valve actuator shafts where low-speed axial thrust must be supported.

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	51210
Series	-	51210 series (single direction, flat seat)
Shaft washer bore d	mm	50
Housing washer OD D	mm	78
Height T	mm	22
Min. chamfer r	mm	1
Seat type	-	Flat seat
Basic dynamic load rating Ca	kN	49
Basic static load rating C0a	kN	111
Limiting speed (grease)	min⁻¹	2400
Limiting speed (oil)	min⁻¹	3600

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 51210 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 51210 to your inquiry list or give us a call, and we'll confirm stock, lead time and quote.

Series Models

Thrust Bearings・51210 series (single direction, flat seat)

51200 51201 51202 51203 51204 51205 51206 51207 51208 5120951210（This page）51211 51212 51213 51214 51215 51216 51217 51218 51220 51305

View All Thrust Bearings Models →