L
o
a
d
i
n
g
.
.
.

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

Product Overview

L
o
a
d
i
n
g
.
.
.

Thrust Bearings/Bearings

51320

Thrust Ball Bearing

NSK Distributor Taiwan

Height T55 mm

Product Features

NSK thrust ball bearing, single-direction 51320 series, model 51320: 100 mm shaft-washer bore, 170 mm housing-washer OD, 55 mm height, flat seat
Basic dynamic load rating Ca 239 kN, basic static load rating C0a 595 kN (NSK official catalog CAT. No. E1103d)
Limiting speed approx. 1000 min⁻¹ (grease), 1500 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

Quantity

Quick Inquiry

Call UsEmail UsChat on LINE Contact Us About This Product

Product Description

The 51320 is an NSK thrust ball bearing from the single-direction 51320 series, standard flat-seat type: 100 mm shaft-washer bore, 170 mm housing-washer outer diameter, 55 mm height. Basic dynamic load rating Ca is 239 kN and basic static load rating C0a is 595 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	51320
Series	-	51320 series (single direction, flat seat)
Shaft washer bore d	mm	100
Housing washer OD D	mm	170
Height T	mm	55
Min. chamfer r	mm	1.5
Seat type	-	Flat seat
Basic dynamic load rating Ca	kN	239
Basic static load rating C0a	kN	595
Limiting speed (grease)	min⁻¹	1000
Limiting speed (oil)	min⁻¹	1500

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 51320 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 51320 to your inquiry list or give us a call, and we'll confirm stock, lead time and quote.

Series Models

Thrust Bearings・51320 series (single direction, flat seat)

51309 51310 51311 51312 51313 51314 51315 51316 51317 5131851320（This page）52202 52204 52205 52206 52207 52208 52209

View All Thrust Bearings Models →