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

NSK Bearings Thrust Bearings 51305

Product Overview

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Thrust Bearings/Bearings

51305

Thrust Ball Bearing

Height T18 mm

Product Features

NSK thrust ball bearing, single-direction 51305 series, model 51305: 25 mm shaft-washer bore, 52 mm housing-washer OD, 18 mm height, flat seat
Basic dynamic load rating Ca 36 kN, basic static load rating C0a 61.5 kN (NSK official catalog CAT. No. E1103d)
Limiting speed approx. 3200 min⁻¹ (grease), 5000 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	51305
Series	-	51305 series (single direction, flat seat)
Shaft washer bore d	mm	25
Housing washer OD D	mm	52
Height T	mm	18
Min. chamfer r	mm	1
Seat type	-	Flat seat
Basic dynamic load rating Ca	kN	36
Basic static load rating C0a	kN	61.5
Limiting speed (grease)	min⁻¹	3200
Limiting speed (oil)	min⁻¹	5000

Product Description

The 51305 is an NSK thrust ball bearing from the single-direction 51305 series, standard flat-seat type: 25 mm shaft-washer bore, 52 mm housing-washer outer diameter, 18 mm height. Basic dynamic load rating Ca is 36 kN and basic static load rating C0a is 61.5 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.