TAS3073/120 SCHAEFER compression-expansion ring

SCHAEFER TAS 3073/120 Locking Assembly

The SCHAEFER TAS 3073/120 is a high-precision mechanical fastener designed to create a rigid, backlash-free frictional connection between a hub and a 120 mm diameter shaft. It operates on a double-taper principle: tightening the integrated screws generates radial pressure, expanding the ring into the hub and contracting it onto the shaft. This model is characterized by excellent self-centering properties, making it ideal for heavy-duty applications with large rotating masses where minimizing run-out is critical for bearing longevity.

Application

• Pulley and Gear Mounting: Precise seating without the need for milling keyways on large-diameter shafts.
• Industrial Automation: Backlash-free power transmission in systems with high dynamics and frequent reversals.
• Gearboxes and Gear Motors: Connecting output shafts to functional machine elements of heavy production machinery.
• Rigid Couplings: Building durable shaft-to-shaft connections with high concentricity.
• Conveyor Drums: Stable fastening of drive pulleys in material handling systems.

Technical Specification

• Manufacturer: SCHAEFER (Germany)
• Designation: TAS 3073/120
• Shaft Diameter (d): 120 mm
• Type: Internal/External Locking Assembly.
• Design: Self-centering with high rotational accuracy.

Installation Tip: To achieve rated load capacity, screws must be tightened gradually in a crosswise pattern using a torque wrench, following the Nm values specified by SCHAEFER.

Features and Benefits

• Elimination of Notch Effect: Keyless mounting increases shaft fatigue strength and allows for higher power transmission.
• High Torsional Stiffness: Frictional contact across the entire surface ensures zero rotational play.
• Infinite Angular Adjustment: Allows for perfect positioning of the hub relative to the shaft before final locking.
• Fretting Corrosion Protection: Solid clamping prevents micro-movements between hub and shaft.
• Fast Disassembly: Integrated jacking-off threads facilitate easy release during maintenance.

Why Choose This Product

Choosing the SCHAEFER TAS 3073/120 locking assembly is an investment in the superior performance of your drive train. Unlike traditional keyed joints, SCHAEFER locking assemblies do not damage the shaft surface and allow for multiple reinstallations. This solution drastically reduces operational costs by eliminating failures caused by loose drive components or fatigue cracks in large-diameter shafts.