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

NSK Bearings Thrust Bearings 51311

Product Overview

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Thrust Bearings/Bearings

51311

Thrust Ball Bearing

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 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

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.