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

NSK Bearings Spherical Roller Bearings 23138K

Product Overview

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Spherical Roller Bearings/Bearings

23138K

Spherical Roller Bearing

NSK Distributor Taiwan

Bore d190 mm
Width B104 mm

Product Features

NSK spherical roller bearing (23138 series), model 23138K: 190 mm bore, 320 mm OD, 104 mm width, tapered bore (K, 1:12 taper)
Basic dynamic load rating Cr 1480 kN, basic static load rating C0r 2020 kN (NSK official catalog; current-generation equivalent 23138CKE4, Cr/C0r figures above are taken from that higher-capacity current design)
Thermal speed rating approx. 1600 min⁻¹, limiting speed (grease) approx. 850 min⁻¹
Double-row rollers on a spherical outer raceway self-align for misalignment and shaft deflection — suited to long shafts and heavy-duty drives
Nahshon is NSK's distributor in Taiwan — add the part number to your inquiry list

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Product Description

The 23138K is an NSK spherical roller bearing from the 23138 series: 190 mm bore, 320 mm outer diameter, 104 mm width, tapered bore (K, 1:12 taper). Basic dynamic load rating Cr is 1480 kN and basic static load rating C0r is 2020 kN (NSK official catalog CAT. No. E1103d; current-generation equivalent 23138CKE4, Cr/C0r figures above are taken from that higher-capacity current design). Spherical roller bearings use double-row rollers on a spherical outer raceway that self-aligns for misalignment and shaft deflection while carrying heavy radial and bidirectional axial loads — common in gear reducers, conveyor rollers, paper machinery and wind-turbine main shafts.

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	23138K
Series	-	23138 series
Bore d	mm	190
Outer diameter D	mm	320
Width B	mm	104
Min. chamfer r	mm	3
Bore type	-	tapered bore (K, 1:12 taper)
Basic dynamic load rating Cr	kN	1480
Basic static load rating C0r	kN	2020
Thermal speed rating	min⁻¹	1600
Limiting speed (grease)	min⁻¹	850

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 23138K 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 23138K to your inquiry list or give us a call, and we'll confirm stock, lead time and quote.