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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

51311

Thrust Ball Bearing

NSK Distributor Taiwan

Height T35 mm

Product Features

NSK thrust ball bearing, single-direction 51311 series, model 51311: 55 mm shaft-washer bore, 105 mm housing-washer OD, 35 mm height, flat seat
Basic dynamic load rating Ca 115 kN, basic static load rating C0a 244 kN (NSK official catalog CAT. No. E1103d)
Limiting speed approx. 1600 min⁻¹ (grease), 2400 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 51311 is an NSK thrust ball bearing from the single-direction 51311 series, standard flat-seat type: 55 mm shaft-washer bore, 105 mm housing-washer outer diameter, 35 mm height. Basic dynamic load rating Ca is 115 kN and basic static load rating C0a is 244 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	51311
Series	-	51311 series (single direction, flat seat)
Shaft washer bore d	mm	55
Housing washer OD D	mm	105
Height T	mm	35
Min. chamfer r	mm	1.1
Seat type	-	Flat seat
Basic dynamic load rating Ca	kN	115
Basic static load rating C0a	kN	244
Limiting speed (grease)	min⁻¹	1600
Limiting speed (oil)	min⁻¹	2400

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 51311 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 51311 to your inquiry list or give us a call, and we'll confirm stock, lead time and quote.

Series Models

Thrust Bearings・51311 series (single direction, flat seat)

51216 51217 51218 51220 51305 51306 51307 51308 51309 5131051311（This page）51312 51313 51314 51315 51316 51317 51318 51320 52202 52204

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