The FKS half-design configuration is the brake-disc version within the half-design flange-coupling offering. It is used when the required supply is a shaft-mounted half connection with a defined braking interface. Its selection must identify the supplied shaft side, mating flange component and brake-disc arrangement together.
Connection principle and load path
TAS Schäfer rigid flange couplings connect shaft ends through backlash-free frictional shaft-hub connections. Each shrink disc supplies the radial clamping force that presses a flange hub onto its shaft. Torque passes through the shaft-to-flange friction interface and the bolted flange connection; the shrink disc itself is outside that load path. The flange connection can be separated directly at the mating faces, which supports assembly and maintenance of the drive.
Configuration and identification
| Configuration item | Details |
|---|---|
| Configuration | FKS half design |
| Product-family feature | Half-design flange connection with brake-disc provision |
| Shaft side | Specify the diameter and clamping arrangement of the supplied half |
| Counterpart | Define the mating flange interface |
| Brake interface | Confirm disc dimensions, location and fastening |
| Final rating | Evaluate the specified half assembly and counterpart |
Half connection and brake interface
The frictional shaft connection and the flange joint perform different roles: the shrink disc creates radial clamping pressure at the shaft-mounted hub, while the mating flange and bolts carry the resulting connection loads. Brake-disc provision adds a further interface for the braking system. Confirm all three interfaces on the application drawing instead of selecting the half coupling from a shaft diameter alone.
Published product-group range
| Characteristic | Published flange-coupling product-group information |
|---|---|
| Transmittable torque | 830–2,742,000 Nm across the product group |
| Nominal diameter | 38–500 mm across the product group |
| Load duties | Torque and dynamic loads; assess axial force and bending where present |
| Connection | Rigid, backlash-free frictional shaft-hub connection |
| Special options | Application-specific designs and corrosion protection |
| Range interpretation | Confirm the actual series, size and configuration rating |
The published group range covers several sizes and constructions. It does not mean that every nominal size or special configuration achieves the maximum listed torque. Brake-disc options, half couplings, different shaft diameters and adapted hubs require the values for their exact assembly.
Drawing and torque terminology
| Symbol | Meaning |
|---|---|
| d_w1 / d_w2 | Shaft diameters at flange sides 1 and 2 |
| M_t,max | Maximum transmittable torque for the specified connection |
| A / D / D_z | Pitch-circle diameter / outer diameter / flange-centering diameter |
| L / a / b / z | Coupling width / shrink-disc width / flange thickness / centering depth |
| Z / S / M_A | Bolt quantity / bolt size / required tightening torque |
| I | Mass moment of inertia |
The tightening values for the shrink-disc screws and for the flange bolts belong to separate fastener groups. Use the actual size-specific value for each. Mass moment of inertia I is expressed in kgm², while weight is listed in kg; these are different selection parameters.
Surface preparation and assembly
Keep the shaft-to-hub contact surfaces and the mating flange faces clean, dry and free of grease. This differs from the functional surfaces of the shrink disc, its screw threads and under-head bearing surfaces, which require the specified lubricant. The flange-hub-to-shrink-disc contact surfaces are oiled as described in the installation documentation. Mixing these surface-preparation requirements can change the intended friction conditions.
Combined loads and operating conditions
Check the shrink connection and the flange bolting separately. Torque, bending moment and axial force may act together at the shaft-hub interface, while the flange bolts and flange body must also be assessed for their actual load. A static torque check alone does not cover cyclic bending or other dynamic duties. Provide the load spectrum and operating speed so the complete assembly can be evaluated.
Configuration and ordering example
The product overview lists FKS half design as a distinct configuration. Obtain the complete item-specific designation and drawing when ordering. Specify the brake-disc dimensions and mounting, the counterpart flange, the supplied shaft diameter, torque, speed and the operating braking duty. Do not assume the complete FKS two-half assembly dimensions or mass apply unchanged to this half-design version.
Application information
Listed application areas include marine drives, wind-power equipment, conveying systems, mixing and process machinery, hydropower, crushing plants and elevators. The appropriate configuration depends on the machine interface and operating duty. Special corrosion protection and individual designs can be specified, and hydraulic shrink-disc arrangements are also available as a separately defined configuration.
Selection and ordering
Specify the complete coupling type, nominal size, both shaft diameters, shaft tolerances, material properties, speed, torque and any axial or bending loads. Include available space, tool access, assembly sequence, surface protection and maintenance requirements. Confirm the type-specific drawing and the required screw tightening values before finalizing the selection.