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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

52308

Double-Direction Thrust Ball Bearing

NSK Distributor Taiwan

Product Features

NSK double-direction thrust ball bearing 52308 (flat seat type): 40 mm bore, 78 mm outer diameter, 49 mm overall height
Basic dynamic load rating Ca 70000 N, basic static load rating C0a 135000 N (NSK official catalog CAT. No. E1103d)
Limiting speed approx. 2000 min⁻¹ (grease), 3000 min⁻¹ (oil)
Carries pure axial load in both directions with no radial load capacity, from the same NSK thrust ball bearing table as Nahshon's existing 51xxx single-direction series; A matching aligning-seat (54 series) and aligning-seat-washer (54 series U) variant is also available for this size

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Product Description

The 52308 is an NSK double-direction thrust ball bearing (flat seat type): 40 mm bore, 78 mm outer diameter, 49 mm overall height. Basic dynamic load rating Ca is 70000 N and basic static load rating C0a is 135000 N (NSK official catalog CAT. No. E1103d). Double-direction thrust ball bearings carry pure axial load in both directions with no radial load capacity; shaft/housing washer orientation must not be reversed during installation. From the same NSK thrust ball bearing table as Nahshon's existing 51xxx single-direction series, commonly used in screw drives, valves and precision positioning mechanisms requiring bidirectional axial location. A matching aligning-seat (54 series) and aligning-seat-washer (54 series U) variant is also available for this size.

For current spec and catalog cross-reference, please inquire: Nahshon is NSK's distributor in Taiwan with full part-number lookup and sourcing support — add the part number to your inquiry list and we will confirm the current code, spec and quote with the factory; sourcing support is also available for discontinued models.

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 52308 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 52308 to your inquiry list or give us a call, and we'll confirm stock, lead time and quote.