CATEGORY ARCHIVE

KTR BoWEX FLE-PA flange

KTR BoWex FLE-PA Flanges: Identification, Sizes and Technical Guides

Explore practical KTR BoWex FLE-PA flange coupling guides for engineers, maintenance teams, machinery owners and spare-parts buyers. This technical knowledge section explains how to identify an installed BoWex FLE-PA flange, determine its size, count the internal teeth, check the SAE flywheel connection and select the correct matching hub.

BoWex FLE-PA couplings are used primarily between diesel engines and hydraulic pumps. Correct replacement selection requires more than matching the general colour, shape or outside diameter of the existing flange.

Flanges from the same product family can differ by nominal size, outside diameter, bolt pattern, SAE connection, internal tooth profile, mounting length and matching hub specification. The complete marking and drivetrain configuration should therefore be verified before ordering.

What Is a KTR BoWex FLE-PA Coupling?

KTR BoWex FLE-PA is a torsionally stiff curved-tooth flange coupling designed for compact engine-to-pump drive connections.

The coupling normally consists of:

• A glass-fibre-reinforced polyamide mounting flange
• Internal curved teeth inside the FLE-PA flange
• A matching steel hub with external curved teeth
• A shaft bore, spline or pump-specific hub connection
• Mounting bolts and the required axial retaining components

The polyamide and steel material combination allows the toothed connection to operate without regular lubrication. The compact design is particularly suitable for mobile machinery, hydraulic power units and other diesel-driven systems where installation space is limited.

The complete coupling can compensate for limited axial, radial and angular displacement within the values specified for the selected size and installation.

How to Identify a KTR BoWex FLE-PA Flange

The most reliable identification method is to read the complete description printed, moulded or stamped on the installed flange.

Start with the KTR BoWex FLE-PA flange identification guide to see which markings, measurements and photographs should be collected.

Inspect the complete circumference and both sides of the flange. Dirt, paint, oil, corrosion or the installed position can conceal part of the description.

Typical markings can include:

• KTR or KTR-Kupplungstechnik
• BoWex
• The nominal coupling size
• FLE-PA
• The outside flange diameter
• The material marking >PA6-GF25<
• An SAE flywheel designation
• A product, drawing or production number
• An older Rheine manufacturing address

Copy the complete description exactly as it appears. Do not omit hyphens, decimal values, diameter symbols or other numbers because each part can be relevant to the replacement.

Understanding the BoWex FLE-PA Description

A typical flange description can follow this structure:

BoWex 80 FLE-PA Ø314.25

The individual sections provide different identification information:

• BoWex identifies the KTR curved-tooth coupling family
• 80 identifies the nominal coupling size
• FLE-PA identifies the polyamide flange coupling execution
• Ø314.25 identifies the outside flange diameter

An outside diameter of approximately 314.25 mm is commonly associated with an SAE 10 flywheel connection. However, the complete bolt pattern, pilot dimensions and original marking should still be verified.

A description containing only “BoWex FLE-PA” is not sufficient because several sizes and flange diameters are available.

Information Required Before Ordering

Before requesting a replacement BoWex FLE-PA flange, collect all available information from the existing coupling and the complete machine.

Please provide:

• The complete marking visible on the flange
• The nominal BoWex FLE-PA size
• The maximum outside flange diameter
• The centring or pilot diameter
• The central opening diameter
• The number of internal teeth
• The number and diameter of mounting holes
• The bolt-circle diameter
• The flange thickness
• The SAE flywheel designation, where applicable
• The complete marking on the matching hub
• The hub bore, spline or keyway dimensions
• The engine manufacturer and model
• The hydraulic pump manufacturer and model
• The machine manufacturer, model and serial number
• Clear photographs of both sides of the flange
• Clear photographs of the matching hub
• A photograph of the complete installed coupling assembly

The original description should be used as the main identification reference whenever it remains readable. Measurements, tooth count and machinery information provide additional confirmation.

KTR BoWex FLE-PA Sizes Available from AWELASTIC

The current AWELASTIC product catalogue includes original BoWex FLE-PA flanges in the following principal sizes:

• KTR BoWex 48 FLE-PA flanges
• KTR BoWex 65 FLE-PA flanges
• KTR BoWex 80 FLE-PA flanges
• KTR BoWex 100 FLE-PA flanges
• KTR BoWex 125 FLE-PA flanges

The identification documentation can also refer to additional BoWex FLE-PA sizes used in particular installations. The nominal size should always be checked from the original component rather than assumed from the machine model.

KTR BoWex 48 FLE-PA Flanges

BoWex 48 FLE-PA is commonly used in compact diesel-engine and hydraulic-pump drive connections. AWELASTIC offers this size with multiple outside diameters, bolt patterns and flywheel connections.

Available flange diameters can range from compact application-specific versions to larger SAE-related flanges. This means that “BoWex 48 FLE-PA” alone is not a complete ordering description.

When identifying a size 48 flange, verify:

• The complete BoWex 48 FLE-PA marking
• The outside flange diameter
• The internal tooth count
• The bolt-hole quantity and diameter
• The bolt-circle diameter
• The centring arrangement
• The matching hub size and shaft connection

BoWex 48 FLE-PA flanges commonly use 50 internal teeth, but the complete flange dimensions must still be verified.

KTR BoWex 65 FLE-PA Flanges

BoWex 65 FLE-PA is used in larger engine-to-pump drive systems and is available with both standardised and application-specific flange dimensions.

Examples include compact special-purpose flanges and larger versions designed around SAE flywheel dimensions.

When identifying a size 65 flange, verify:

• The complete size and outside diameter
• The internal curved-tooth connection
• The bolt pattern and pilot dimensions
• The SAE size or special application designation
• The matching steel hub
• The engine and hydraulic pump combination

BoWex 65 FLE-PA flanges commonly use 42 internal teeth. Tooth count alone does not identify the outside flange execution.

KTR BoWex 80 FLE-PA Flanges

BoWex 80 FLE-PA is used in medium- and higher-capacity diesel-hydraulic drive systems.

A commonly encountered version has an outside diameter of approximately 314.25 mm corresponding with an SAE 10 flywheel connection. Other flange executions may also be available.

BoWex 80 FLE-PA flanges commonly use 46 internal teeth.

Before ordering, compare:

• The complete printed description
• The outside diameter
• The internal tooth count
• The bolt-circle diameter
• The centring diameter
• The flange thickness
• The matching BoWex hub

KTR BoWex 100 FLE-PA Flanges

BoWex 100 FLE-PA is intended for higher-load engine-to-pump drive connections. Current AWELASTIC products include different outside flange diameters and SAE-related executions.

BoWex 100 FLE-PA flanges commonly use 48 internal teeth.

When identifying this size, verify:

• The complete BoWex 100 FLE-PA description
• The outside flange diameter
• The SAE or special connection
• The internal tooth profile
• The bolt pattern
• The hub bore or spline
• The required short or long mounting arrangement

A size 100 flange should not be selected only because it has the same internal tooth count as another BoWex size.

KTR BoWex 125 FLE-PA Flanges

BoWex 125 FLE-PA is used in selected large engine-driven hydraulic and industrial applications.

The nominal size does not provide enough information to select the replacement. Check the complete product marking, outside diameter, bolt pattern, SAE connection and matching hub.

AWELASTIC product information currently contains inconsistent references to the number of internal teeth for some size 125 listings. For that reason, this guide does not state one universal tooth count for every BoWex 125 FLE-PA version.

Use the original flange description, hub marking, technical drawing and measured tooth count together when confirming a size 125 replacement.

Identifying a BoWex FLE-PA Flange by Internal Teeth

When the flange description is worn or unreadable, the number of internal teeth can help identify the probable nominal size.

Common identification references include:

• BoWex 48 FLE-PA – commonly 50 internal teeth
• BoWex 65 FLE-PA – commonly 42 internal teeth
• BoWex 80 FLE-PA – commonly 46 internal teeth
• BoWex 100 FLE-PA – commonly 48 internal teeth

The tooth count is only one part of the identification. Flanges with different nominal sizes or outside dimensions can have tooth counts that appear similar.

Always combine the tooth count with:

• The outside flange diameter
• The internal toothed opening diameter
• The tooth width
• The flange thickness
• The bolt pattern
• The SAE flywheel connection
• The matching hub description

SAE Flywheel Connections

Many BoWex FLE-PA flanges are designed for engine flywheels corresponding with SAE standards.

Depending on the coupling size and flange version, product descriptions can refer to SAE connections such as:

• SAE 6.5
• SAE 7.5
• SAE 8
• SAE 10
• SAE 11.5
• SAE 14

Before identifying a flange as an SAE version, confirm:

• The maximum outside diameter
• The centring or pilot diameter
• The number of mounting holes
• The individual hole diameter
• The bolt-circle diameter
• The flange thickness
• The axial installation position

Do not determine the SAE size from one approximate diameter alone. Compare the complete dimensional pattern with the appropriate technical documentation.

Special and Non-SAE Flange Dimensions

Not every BoWex FLE-PA flange uses a standard SAE flywheel connection. AWELASTIC also supplies application-specific flanges with special diameters, bolt patterns and centring arrangements.

For a special flange, record:

• Maximum outside diameter
• Central opening diameter
• External or internal centring diameter
• Flange thickness
• Number of mounting holes
• Hole diameter
• Bolt-circle diameter
• Distance between the flange face and the toothed section

A photograph showing the exact measurement points can help distinguish between similar special-purpose flanges.

How to Identify the Matching BoWex Hub

The FLE-PA flange engages with a matching steel BoWex hub featuring external curved teeth. Correctly identifying the flange does not automatically confirm the correct hub.

Use the KTR BoWex hub identification guide when the hub part number is unavailable or difficult to read.

Hub selection can depend on:

• The BoWex coupling size
• The number and profile of the external teeth
• The shaft diameter
• The spline profile and tooth count
• The keyway dimensions
• The hub length
• The short or long installation arrangement
• The hydraulic pump shaft specification
• The axial retaining method

The flange and hub must belong to the same compatible BoWex size and tooth system.

Flange and Hub Must Be Inspected Together

A damaged polyamide flange should not be replaced without inspecting the matching steel hub.

Check the hub for:

• Worn or rounded external teeth
• Chipped or damaged tooth edges
• Excessive rotational clearance
• Corrosion or contamination
• A worn bore, spline or keyway
• Incorrect axial position
• Loose retaining components
• Cracks or deformation

A new FLE-PA flange installed on a severely worn or incorrectly positioned hub can fail prematurely.

Short and Long Mounting Arrangements

BoWex FLE-PA couplings can be installed in different axial arrangements depending on the hub design and available installation space.

When replacing the coupling, verify:

• The original hub orientation
• The installed distance between engine and pump
• The position of the hub relative to the flange
• The available clearance inside the bell housing
• The axial retaining plate or screw arrangement
• The required engagement length of the curved teeth

A hub installed in the wrong orientation or axial position can produce incomplete tooth engagement and premature wear.

Common BoWex FLE-PA Failure Causes

BoWex FLE-PA flange damage is not always caused by normal material ageing. Failures can also result from an incorrect coupling selection or a problem elsewhere in the engine-to-pump connection.

Read the BoWex FLE-PA failure causes guide for a more detailed inspection checklist.

Common causes can include:

• An incorrect flange or hub size
• Insufficient tooth engagement
• An incorrectly positioned hub
• A worn or damaged steel hub
• Loose or incorrectly tightened bolts
• Incorrect flywheel or bolt-pattern selection
• Movement in engine or hydraulic-pump mountings
• Excessive angular, radial or axial displacement
• High operating temperature
• Oil, fuel or chemical contamination
• Overload or drivetrain shock
• Damage elsewhere in the hydraulic drive system

The underlying cause should be identified before installing a replacement flange.

Signs of BoWex FLE-PA 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 pump.

Possible signs of damage include:

• Cracks in the polyamide flange
• Broken or missing internal teeth
• Rounded or heavily worn tooth surfaces
• Elongated mounting holes
• Loose or damaged bolts
• Heat-related deformation
• Discolouration or material deterioration
• Excessive rotational clearance
• Uneven contact marks
• Damage around the centring surface

Repeated flange damage can indicate that the hub, pump shaft, mounting arrangement or machine supports also require repair.

Why Use Original KTR BoWex FLE-PA Components?

An original KTR BoWex FLE-PA flange is manufactured for the specified dimensions, tooth geometry, material properties and operating requirements of the corresponding coupling system.

A visually similar alternative can differ in:

• Polyamide composition
• Glass-fibre content
• Mechanical strength
• Temperature stability
• Internal tooth geometry
• Bolt-hole accuracy
• Centring dimensions
• Dimensional consistency
• Production traceability

These differences can affect fitment, load distribution, tooth engagement and the service life of the complete coupling.

How to Recognise an Original KTR Flange

When inspecting an existing or replacement flange, look for:

• Clear KTR or KTR-Kupplungstechnik identification
• The BoWex FLE-PA product family name
• The complete nominal size
• The outside flange diameter or SAE designation
• The material code >PA6-GF25<
• Production or traceability markings
• Consistent moulding quality
• Dimensions corresponding with the original specification

A logo or similar colour alone does not confirm that a flange is genuine or technically compatible with the installed coupling.

BoWex FLE-PA Applications

BoWex FLE-PA couplings are primarily used in compact diesel-engine and hydraulic-pump connections.

Typical application areas include:

• Construction machinery
• Excavators and loaders
• Forestry machinery
• Agricultural equipment
• Mobile cranes
• Hydraulic power units
• Road-building machinery
• Rail maintenance equipment
• Industrial pump systems
• Compressors and compact power units
• Mining and material-handling machinery

The machine model can help narrow the search, but it does not replace the original coupling description. Similar machines may use different engines, pumps, flywheels or hub specifications.

Installation and Alignment Checks

Installation should follow the appropriate KTR assembly instructions for the exact flange and hub configuration.

Before returning the equipment to service:

• Confirm the complete replacement description
• Check that the flange and hub belong to the same BoWex size
• Inspect all internal and external teeth
• Verify the required hub orientation
• Confirm the correct axial position
• Use the specified bolts and retaining components
• Follow the required tightening sequence and torque values
• Check the engine and pump supports
• Confirm that the components are not forced into position
• Rotate and inspect the assembly before operation

The coupling can accommodate defined displacement, but it should not be used to compensate for major assembly errors, damaged supports or an incorrect engine-to-pump geometry.

KTR BoWex FLE-PA Technical Data and Downloads

Technical documentation can help confirm available sizes, flange dimensions, torque ratings, SAE flywheel connections, mounting arrangements and assembly requirements.

Visit the BoWex FLE-PA catalogues and assembly instructions page to access the available technical resources.

Use the documentation corresponding with the exact coupling size and installation. General product-family data should not be applied automatically to every FLE-PA flange.

Browse Original KTR BoWex FLE-PA Flanges

Browse the complete range of original KTR BoWex FLE-PA flanges by nominal size, outside diameter, bolt pattern and SAE flywheel connection.

Individual product pages provide the complete product description, dimensions, internal tooth count, photographs, stock information and ordering options.

The WooCommerce product category is intended for comparing and purchasing actual flanges, while this post category provides technical explanations, identification guidance and maintenance information.

Explore Other KTR Coupling Products

Browse the main KTR coupling catalogue for BoWex FLE-PA flanges, BoWex-ELASTIC elements, ROTEX spiders, BoWex M sleeves and related original components.

Each KTR coupling family has its own construction and identification method. BoWex FLE-PA flanges should not be confused with highly flexible BoWex-ELASTIC elements or standard BoWex polyamide sleeves.

Expert KTR BoWex FLE-PA Identification Support

If the installed flange cannot be identified, send AWELASTIC the complete visible description, internal tooth count, flange measurements, hub details, machinery information and clear photographs.

The articles in this post category provide practical help with BoWex FLE-PA size identification, SAE flywheel recognition, tooth-count verification, hub selection, failure analysis and original replacement flange selection.