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Centaflex K couplings

CENTAFLEX K Couplings: Identification, Sizing and Technical Guides

Explore practical CENTAFLEX K coupling guides created for maintenance teams, engineers, equipment owners and spare-parts buyers. This technical knowledge section explains how to identify an installed CENTAFLEX K coupling, determine its size, check the flywheel connection, inspect the matching hub and select the correct original replacement components.

CENTAFLEX K is not identified only by its outside diameter or general appearance. The complete coupling specification can include the nominal size, flange diameter, SAE flywheel standard, hub design, spline dimensions and connection with the installed hydraulic pump or splitter gear.

The articles in this category focus on practical identification, inspection and replacement questions. Use them to collect the correct technical information before ordering and to avoid selecting a visually similar but incompatible flange or hub.

How to Identify a CENTAFLEX K Coupling

CENTAFLEX K couplings are often relatively straightforward to identify because the full flange description is normally moulded, stamped or otherwise marked on the existing component.

Start with the CENTAFLEX K coupling identification guide to learn which markings, measurements and photographs should be collected before selecting a replacement.

Check the complete circumference and both sides of the flange for information such as:

• CENTAFLEX K or CF-K product marking
• Nominal coupling size
• Complete flange designation
• SAE flywheel size
• Non-standard flange diameter, where applicable
• Production, drawing or product number
• Manufacturer identification

If the flange marking is damaged or no longer readable, the coupling may need to be identified through its dimensions, flywheel connection, hub design and installed equipment.

Information Required Before Ordering

Before requesting a replacement CENTAFLEX K flange or hub, collect all available information from the coupling and the complete machine.

Please provide:

• The complete marking visible on the flange
• The nominal CENTAFLEX K size
• The outside flange diameter
• The bolt-hole quantity and arrangement
• The bolt-circle diameter
• The flywheel or adapter connection
• The number of steel jaws on the matching hub
• The hub bore, spline or shaft dimensions
• The overall hub length
• The engine manufacturer and model
• The hydraulic pump or splitter gearbox model
• The machine manufacturer, model and serial number
• Clear photographs of both sides of the flange
• Clear photographs of the hub and internal connection
• A photograph of the complete installed coupling assembly

The product marking should be used as the primary identification reference whenever it remains readable. Measurements and machine information provide additional confirmation.

CENTAFLEX K Sizes 100, 125, 150 and 200

The CENTAFLEX K product range represented in the AWELASTIC catalogue includes four principal coupling sizes:

• CENTAFLEX K 100
• CENTAFLEX K 125
• CENTAFLEX K 150
• CENTAFLEX K 200

The size affects the coupling dimensions, hub design and permissible drivetrain requirements. A larger numerical size should not be selected simply because it appears stronger. The replacement must correspond with the original engine, flywheel, hub and hydraulic pump configuration.

Browse all available original CENTAFLEX K coupling flanges and elements by size and connection specification.

Identifying the Coupling Size by the Steel Hub Jaws

When the flange marking is damaged, the number of steel jaws on the matching hub can help identify the probable CENTAFLEX K size.

• CENTAFLEX K 100 hubs normally have 4 steel jaws
• CENTAFLEX K 125 hubs normally have 6 steel jaws
• CENTAFLEX K 150 hubs normally have 8 steel jaws
• CENTAFLEX K 200 hubs normally have 12 steel jaws

The jaw count is a useful identification indicator, but it does not confirm the complete flange or hub specification by itself. The flywheel size, flange diameter, hub bore and spline connection must still be checked.

CENTAFLEX K 100 Couplings

CENTAFLEX K 100 is used in compact diesel-hydraulic drive arrangements where a short and torsionally stiff engine-to-pump connection is required.

Available K 100 flanges can have different outside diameters and different SAE flywheel connections. A K 100 designation alone is therefore not sufficient to select the correct component.

When identifying a K 100 coupling, check the complete CF-K marking, flange diameter, bolt pattern, flywheel standard and the four-jaw matching hub.

CENTAFLEX K 125 Couplings

CENTAFLEX K 125 couplings are used in selected construction, agricultural and mobile hydraulic drive systems requiring a larger engine-to-pump connection.

Available versions include standardised SAE flywheel flanges and application-specific outside diameters. Confirm the complete flange designation and the six-jaw hub before ordering.

Do not assume that two K 125 flanges are interchangeable because their hub connection appears similar. The engine-side mounting geometry can differ significantly.

CENTAFLEX K 150 Couplings

CENTAFLEX K 150 couplings are intended for higher-load hydrostatic drive arrangements found in heavier construction and industrial equipment.

The K 150 hub can be recognised by its eight steel jaws, but the hub spline and flange connection must still match the installed drivetrain.

Check the complete product marking, outside flange diameter, bolt pattern and flywheel standard before replacing the coupling.

CENTAFLEX K 200 Couplings

CENTAFLEX K 200 is the largest CENTAFLEX K size currently represented within the AWELASTIC product range. It is used in selected high-load engine-to-pump and heavy machinery applications.

The matching hub normally has twelve steel jaws. However, the exact hub bore, spline and mounting arrangement must be confirmed using the original component or technical drawing.

A K 200 flange should not be selected only from its nominal size or outside appearance. The complete original specification remains essential.

SAE Flywheel Identification

Many CENTAFLEX K flanges are designed for standard SAE flywheel connections. The SAE designation describes the engine-side flywheel dimensions and mounting arrangement.

Common product descriptions can include designations such as SAE 6½, SAE 8, SAE 10, SAE 11½ or SAE 14, depending on the CENTAFLEX K size and flange version.

Before selecting an SAE flange, verify:

• The exact SAE flywheel designation
• The outside flange diameter
• The bolt-hole quantity
• The bolt-circle diameter
• The flange thickness and axial position
• The available clearance inside the flywheel housing

Do not identify an SAE flywheel only from one approximate measurement. Compare the complete dimensional pattern with the relevant technical documentation.

Non-Standard CENTAFLEX K Flanges

Not every CENTAFLEX K coupling uses a standard SAE flywheel connection. Some flanges are identified by a specific outside diameter or application-related designation.

Examples can include product markings in which the nominal K size is followed by a numerical flange diameter rather than an SAE standard.

For non-standard flanges, provide accurate measurements of:

• Maximum outside diameter
• Central opening diameter
• Flange thickness
• Number of mounting holes
• Individual hole diameter
• Bolt-circle diameter
• Distance from the flange face to the hub position

A technical drawing or clear photograph with the measurement points marked can significantly improve identification accuracy.

How to Identify a CENTAFLEX K Hub

The coupling hub connects the CENTAFLEX K flange with the hydraulic pump shaft or another driven component. Correct flange identification does not automatically confirm the correct hub.

Hub selection can depend on:

• The corresponding CENTAFLEX K size
• The number and shape of the steel jaws
• The pump shaft diameter
• The internal spline profile
• The number of spline teeth
• The spline major and minor diameters
• The hub length
• The keyway or clamping arrangement
• The required axial installation position

When an original hub number is unavailable, provide a drawing, detailed measurements and clear photographs of the internal spline or bore.

Flange and Hub Must Be Matched Together

A CENTAFLEX K assembly normally uses a polyamide flange together with a matching steel hub. Both components must correspond with the same coupling size and drivetrain configuration.

A flange of the correct size can still be unsuitable when combined with the wrong hub. Differences in jaw count, spline profile, shaft connection or installed length can prevent assembly or cause incorrect drivetrain operation.

Inspect both components before ordering and determine whether only the flange, only the hub or the complete matched assembly requires replacement.

Why Use Original CENTAFLEX K Components

Original CENTAFLEX K components are manufactured for the specified coupling dimensions, connection geometry and operating characteristics of the corresponding drivetrain.

An unverified alternative may resemble the original flange but differ in polyamide composition, dimensional accuracy, temperature stability, jaw geometry or manufacturing consistency.

These differences can affect fitment, hub engagement and the reliability of the engine-to-pump connection.

When checking a replacement, look for:

• Clear CENTA or CENTAFLEX identification
• The complete CF-K size and flange designation
• Consistent moulding and finishing quality
• Correct bolt-hole and hub geometry
• Traceable product information
• Dimensions matching the original technical specification

A similar colour or outside shape alone does not confirm that a component is technically interchangeable.

Signs of CENTAFLEX K Flange Wear or Damage

Inspect the coupling when the machine develops unusual drivetrain noise, increased vibration, irregular hydraulic operation or visible movement between the engine and hydraulic pump.

Common signs of damage include:

• Cracks in the polyamide flange
• Broken or damaged internal engagement areas
• Elongated or damaged bolt holes
• Loose or damaged mounting bolts
• Excessive rotational clearance
• Worn or damaged steel hub jaws
• Worn hub splines or keyways
• Heat-related deformation
• Oil, fuel or chemical contamination
• Misalignment between the engine and hydraulic pump

The cause of premature failure should be identified before a new component is installed. Repeated damage can indicate incorrect alignment, worn mountings, a damaged hub, excessive drivetrain movement or an unsuitable replacement part.

Inspect the Complete Drive Connection

Do not inspect only the visibly damaged flange. Check the complete connection between the diesel engine and hydraulic pump or splitter gearbox.

Inspect:

• The matching steel hub
• The pump shaft or spline
• The engine flywheel
• The flywheel housing
• All mounting bolts and fasteners
• The hydraulic pump mounting flange
• The engine and pump supports
• The axial position of the coupling assembly

A new flange can fail prematurely when installed with a damaged hub, worn spline, loose pump mounting or incorrect axial position.

CENTAFLEX K Alignment and Installation

CENTAFLEX K couplings have high torsional and radial stiffness and are primarily intended for accurately aligned flange-mounted drive systems.

Small alignment deviations expected in correctly assembled flange-mounted drives can be accommodated, but the coupling should not be used to correct major installation errors or unsuitable engine-to-pump geometry.

During installation:

• Follow the correct technical drawing
• Confirm the required axial hub position
• Check that the flange engages evenly with the hub
• Use the specified bolts and fastening method
• Follow the correct tightening sequence and torque values
• Check the pump and engine mounting condition
• Ensure that no component is forced into position

Installation procedures and tightening values should follow the relevant manufacturer documentation for the specific coupling and machine.

CENTAFLEX K Applications

CENTAFLEX K couplings are commonly used in diesel-driven hydrostatic systems and other compact engine-to-pump connections.

Typical applications include:

• Excavators
• Loaders
• Vibratory rollers
• Cranes
• Dumpers
• Forklifts
• Concrete mixers and concrete pumps
• Road-finishing machinery
• Agricultural machinery and tractors
• Rail vehicles
• Small compressor drive systems
• Industrial hydraulic power units

The machine model can help narrow the search, but it should not replace the original coupling code. Equipment from the same model range can use different engines, hydraulic pumps, flywheels or hub specifications.

CENTAFLEX K Technical Data and Downloads

Technical documentation can help confirm coupling sizes, flange dimensions, torque ratings, permissible speeds, flywheel connections and installation requirements.

Visit the CENTAFLEX K catalogues and technical downloads page to review available specifications and dimensional information.

Technical data should always be evaluated together with the original engine, hydraulic pump and machine configuration. Selecting a coupling only by nominal torque or outside diameter can overlook critical mounting details.

Browse Original CENTAFLEX K Couplings

Browse the complete range of original CENTAFLEX K flanges and coupling components by nominal size, flange diameter and SAE flywheel connection.

Individual product pages provide product codes, photographs, dimensions, current availability and delivery information.

You can also return to the main CENTAFLEX coupling guides category for information about CENTAFLEX A, H, K and X coupling systems.

Expert CENTAFLEX K Identification Support

If the required CENTAFLEX K flange or hub cannot be identified, send AWELASTIC all visible product markings, flange and hub measurements, equipment details and clear photographs.

The articles in this category provide practical help with CENTAFLEX K identification, size comparison, SAE flywheel selection, hub inspection, original-part verification and correct replacement component selection.