H23 Series Adapter Sleeves

H23 series adapter sleeves are slotted bearing accessories used to mount bearings with 1:12 tapered bores onto cylindrical shafts. The sleeve provides the tapered bearing seat while its cylindrical bore fits the shaft, allowing the bearing to be positioned without machining a tapered shaft seat. The assembly is secured by a matching locknut and locking device.
The H23 series is dimensionally associated with ISO 2982-1 adapter sleeve requirements. The standard specifies dimensional requirements for adapter sleeves with a 1:12 taper and their associated components. 

An H23 adapter sleeve is installed between the bearing bore and cylindrical shaft. During mounting, the bearing is driven axially along the sleeve's external taper. This causes the bearing inner ring to expand radially and establish the required interference fit on the shaft.

The longitudinal slot allows the sleeve to adjust around the shaft during drive-up. The threaded section accepts the corresponding locknut, while the locking device prevents unintended nut rotation after installation.

Adapter sleeves can be used on shafts with a constant cylindrical diameter and, with an appropriate support arrangement, on stepped shafts. The bearing's required internal-clearance reduction remains an important mounting criterion and should be determined from the bearing manufacturer's installation data rather than from the sleeve designation alone.

H23 sleeves are intended for bearings with 1:12 tapered bores. Compatibility depends on the exact bearing dimensions and sleeve size.

Typical compatible bearing arrangements include selected 230.., 231.. and 223..K spherical roller bearing sizes, together with other bearing series specified for the corresponding sleeve dimensions.

For purchasing and replacement, confirm the complete bearing designation, sleeve designation and shaft diameter rather than selecting the sleeve only by nominal shaft size.

The following dimensions use the standard H23 designation system. d1 is the shaft diameter, d is the sleeve bore diameter, d2 is the major sleeve diameter, B1 is the sleeve length, and B2 is the specified axial dimension associated with the sleeve assembly. 

H23 sleeves are normally supplied with matching locking components. For example, an H2305 assembly uses the corresponding KM05 locknut and MB05 lockwasher. Other H23 sizes use the appropriate KM-series locknut and matching locking washer.

The exact locking arrangement should be checked against the selected sleeve size and bearing arrangement. A locknut or locking device should not be substituted solely because its nominal thread appears similar.

The sleeve is designed for a cylindrical shaft and adjusts to the shaft diameter during bearing mounting. Standard adapter-sleeve arrangements commonly use controlled shaft and sleeve-bore tolerances to establish the required fit.
The shaft should provide adequate seating length and suitable surface condition for the selected bearing and sleeve. Shaft shoulders, support rings and other axial-location components may be required depending on the bearing arrangement. 

For standard H23 arrangements, mounting is normally performed mechanically by tightening the locknut and driving the bearing onto the sleeve taper. The final position should be established from the required bearing internal-clearance reduction or specified axial drive-up, not simply by tightening the nut to a fixed torque.
For larger H23 sleeves, versions with oil holes or grooves may be available for hydraulic mounting. Hydraulic capability should not be assumed for every H23 size or execution. Confirm the exact sleeve configuration before specifying oil-injection mounting. 

Correct mounting requires control of the bearing's remaining internal clearance after drive-up. Excessive drive-up can reduce clearance beyond the manufacturer's permitted range and affect bearing operating conditions.
For procurement or replacement projects, the mounting specification should therefore identify:

• Bearing designation and initial internal-clearance class
• Sleeve designation
• Shaft diameter and shaft tolerance
• Required clearance reduction or axial drive-up method
• Mechanical or hydraulic mounting method, where applicable 

The supplied product specification identifies carbon steel as the sleeve material and calls for corrosion protection during storage and transportation.
The sleeve should be free from burrs on the slot and threaded areas that could interfere with installation. If a specific steel grade, heat-treatment condition, surface treatment or material certificate is required, it should be stated in the purchase specification rather than assumed from the H23 designation. 

Relevant inspection items for H23 adapter sleeves include:

• Sleeve bore and outside dimensions
• Thread dimensions and engagement
• Taper geometry
• Slot condition
• Surface condition
• Material identification, where specified

ISO 2982-1 provides the dimensional framework for adapter sleeves; it does not by itself establish every manufacturer's material, process or inspection-document requirement.

Where material certificates, dimensional inspection reports or other quality documents are required, specify them in the RFQ.

H23 adapter sleeves are used in rotating equipment where tapered-bore bearings must be mounted on cylindrical shafts, including:

• Conveyor and bulk-material handling equipment
• Mining machinery
• Industrial fans and blowers
• Pumps and gearboxes
• Metallurgical and process equipment
• General industrial transmission systems

Application suitability depends on the selected bearing, shaft arrangement, radial and axial loads, rotational speed, operating temperature and mounting conditions.

A standard H23 assembly consists of the adapter sleeve, matching locknut and locking device. The exact locking components depend on the sleeve size.
For international shipment, the sleeve should be protected against corrosion and mechanical damage, particularly around the tapered surface, bore, thread and slot. If specific export packaging or preservation requirements apply, they should be included in the purchase specification. 

For an H23 adapter sleeve quotation, provide:

• Sleeve designation, such as H2305, H2318 or H2332
• Bearing designation
• Shaft diameter
• Required locking arrangement, if different from the standard configuration
• Mechanical or hydraulic mounting requirement
• Quantity
• Any required material certificates, inspection records or packaging requirements

For replacement orders, supplying the existing bearing designation and adapter sleeve designation together is the most reliable way to verify dimensional compatibility before purchase.