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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

51315

Thrust Ball Bearing

NSK Distributor Taiwan

Height T44 mm

Product Features

NSK thrust ball bearing, single-direction 51315 series, model 51315: 75 mm shaft-washer bore, 135 mm housing-washer OD, 44 mm height, flat seat
Basic dynamic load rating Ca 159 kN, basic static load rating C0a 365 kN (NSK official catalog CAT. No. E1103d)
Limiting speed approx. 1300 min⁻¹ (grease), 1900 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 51315 is an NSK thrust ball bearing from the single-direction 51315 series, standard flat-seat type: 75 mm shaft-washer bore, 135 mm housing-washer outer diameter, 44 mm height. Basic dynamic load rating Ca is 159 kN and basic static load rating C0a is 365 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	51315
Series	-	51315 series (single direction, flat seat)
Shaft washer bore d	mm	75
Housing washer OD D	mm	135
Height T	mm	44
Min. chamfer r	mm	1.5
Seat type	-	Flat seat
Basic dynamic load rating Ca	kN	159
Basic static load rating C0a	kN	365
Limiting speed (grease)	min⁻¹	1300
Limiting speed (oil)	min⁻¹	1900

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 51315 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 51315 to your inquiry list or give us a call, and we'll confirm stock, lead time and quote.

Series Models

Thrust Bearings・51315 series (single direction, flat seat)

51305 51306 51307 51308 51309 51310 51311 51312 51313 5131451315（This page）51316 51317 51318 51320 52202 52204 52205 52206 52207 52208

View All Thrust Bearings Models →