KOYO Bearings

KOYO bearings 23188RHAK

Model:23188RHAK


Dimensions(mm):440x720x226mm


Email:skfnskoyo@gmail.com


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Description

200rr-koyo
Japan’s koyo  bearing
 company produces tens of thousands of high-precision and high-quality Koyo bearing series products), providing information about aerospace technology, computer components, motors, high-speed trains, MRT trains, industrial machinery, CNC lathes, high-precision machining machines, automobile, locomotive industry, steel industry And other important components to make the best choice.

Of course. The bearing code KOYO 23188RHAK is a highly specific designation that builds upon the previous examples.

Here is the detailed breakdown:

KOYO Bearing 23188RHAK

  • Manufacturer: KOYO (A major Japanese bearing manufacturer, now part of JTEKT Corporation).

  • Type: Tapered Roller Bearing. Designed to handle heavy combined radial and axial loads.

  • Series: The prefix 23188 defines the bore size and external dimensions.

    • The "2" signifies a metric tapered roller bearing.

    • The "3" indicates a wide contact angle, optimized for heavy axial loads.

    • The number "188" specifies the nominal bore size.

  • Bore Diameter: The nominal bore size is 440 mm. However, the "K" suffix is critical here.

  • Suffix: The suffix RHAK defines the bearing's key features:

    • R: Indicates a flanged outer ring (cup). The flange aids in axial location and simplifies installation in the housing.

    • HA: Signifies that the rollers and cone (inner ring) are made from case-hardened steel. This provides a hard, wear-resistant surface with a tough, shock-resistant core, essential for severe applications.

    • K: This is the most important distinguishing feature. The "K" indicates that the bearing has a tapered bore. The bore is not cylindrical; it is ground to a slight taper (usually a 1:12 ratio).


Key Specifications (Approximate Dimensions)

The external dimensions are identical to the 23188R and 23188RHA.

DimensionValue (mm)Value (inches)
Bore Diameter (d)440 mm (Tapered)17.3228 in (Tapered)
Outer Diameter (D)720 mm28.3465 in
Width (T)~ 226 mm~ 8.8976 in
Taper1:12 (Standard)
Weight~ 206 kg~ 454 lbs

Crucial Note: The "K" suffix means the bore is tapered. The specified bore diameter (440mm) is a nominal size. The actual diameter will vary along the length of the bore. This bearing must be used with an adapter sleeve.


The Significance of the "K" Tapered Bore

A tapered bore is designed for use with an adapter or withdrawal sleeve. This system allows for:

  1. Interference Fit on a Straight Shaft: The bearing and sleeve are installed onto a straight-sided shaft. Tightening the sleeve nut drives the bearing onto the taper, creating a secure, interference fit without needing to heat the bearing or press it on.

  2. Easier Installation and Removal: The sleeve system simplifies mounting and dismounting compared to a direct press-fit on a large shaft.

  3. Precise Clearance Adjustment: By driving the bearing further onto the tapered sleeve, the internal clearance of the bearing can be adjusted to an optimal setting.


Comparison of the KOYO 23188 Series

Feature23188R23188RHA23188RHAK
Flanged Outer Ring (R)YesYesYes
Case-Hardened Internals (HA)NoYesYes
Bore TypeCylindricalCylindricalTapered (K)
MountingPress FitPress FitAdapter Sleeve
Application SeverityStandard Heavy-DutySevere DutySevere Duty with easier mounting

Common Applications

This bearing is used in the same severe-duty applications as the 23188RHA, but specifically where the design calls for a tapered bore mounting system:

  • Mining and Quarrying Equipment: Large crushers, rotary drills, and draglines.

  • Heavy Construction Machinery: Large excavators and bulldozers.

  • Industrial Fans and Blowers on large shafts.

  • Large Gearboxes and Drives.

How to Find More Information or a Replacement

  1. Cross-Reference: This bearing can be cross-referenced with Timken 23188RHAKNSK 23188RHAK, or NTN 23188RHAK. The "K" suffix is critical.

  2. Search Online: Use the full part number "23188RHAK" in your search. You will need to pair it with the appropriate adapter sleeve (e.g., an H-234820 sleeve for a 440mm nominal bore).

  3. Consult a Catalog: Always refer to the official KOYO Tapered Roller Bearing catalog for precise dimensions, load ratings, and specific instructions on the required adapter sleeve and installation procedures.

In summary, the KOYO 23188RHAK is a severe-duty tapered roller bearing with a flanged outer ring, case-hardened components, and a tapered bore designed for mounting onto a straight shaft using an adapter sleeve. It combines maximum durability with easier installation.

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