Ringfeder 404 AUS B MSD 50mm Tow Coupling

Allan Davis on 18/09/2026

Ringfeder 404 AUS B MSD 50mm tow coupling

Ringfeder 404 AUS B MSD 50mm Tow Coupling

$2,453.00

Ringfeder 404 AUS B MSD 50mm manual tow coupling for heavy Australian drawbar applications, with 320kN D-value, 160 x 100mm mounting pattern, reinforced guide funnel, manual second locking device and C50-X classification.

Part number TC7400G.

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Description

Overview

The Ringfeder 404 AUS B MSD tow coupling is a 50mm manual heavy-duty trailer coupling for Australian drawbar applications. It carries a 320kN D-value, uses a 160 x 100mm mounting pattern with a self-closing mechanism, manual second locking device and reinforced guide funnel.

Features

  • Manual second locking device with twist lock.
  • Reinforced coupling body and replaceable guide funnel.
  • Improved upper bushing, dust sealing and top cover sealing.
  • Additional grease nipple allows grease or oil lubrication to suit the application.
  • Split wear plate and stronger return spring support serviceability and funnel return.

Specifications and Materials

50mm drawbar eye diameter, C50-X coupling class, manual operation, E-coat finish and black. Mounting pattern is 160 x 100mm with a 94mm main hole. Maximum D-value is 320kN, with application-dependent Dc, S and V values to be checked against the vehicle and trailer combination.

Part number: TC7400G.

See the official Ringfeder 404 AUS B MSD technical page

Compatibility and Fitment

This model replaces earlier 303 AUS B MSD and RF50 AUS AM/RL coupling models and retains the 160 x 100mm mounting pattern. However, the 404 AUS generation uses redesigned internal components, so do not transfer previous-model spare parts into this coupling. Confirm the 50mm drawbar eye, mounting pattern, main-hole size and required performance values before installation.

Related Parts

Check the related service parts below against the coupling before ordering.

Use Part number Part type
Service part TC7506G Major repair kit
Replacement component TC7205G Coupling pin kit
Service part TC7108G Wear plate kit
Replacement component TC7214G MSD twist lock

 

Compliance and Safety

Check that the coupling closes and locks correctly before operation, and inspect the funnel, coupling bolt, wear plate and locking components. Use 404 AUS-specific replacement parts because earlier 303 and RF50 internal parts are not interchangeable with the redesigned 404 assembly.

Trailer Applications

Heavy truck and trailer fleets use this coupling for 50mm drawbar towing where a manual 320kN coupling and 160 x 100mm mounting pattern suit the vehicle installation.

Why Choose ICS Trailers

The Ringfeder 404 AUS B MSD tow coupling shares familiar mounting dimensions with earlier Ringfeder models, but its internal spare parts are different. ICS Trailers can help compare the old coupling model, 50mm eye size, 160 x 100mm mount and existing hardware before you replace or service the assembly.

  • Match 404-specific repair kits, wear parts and locking components rather than reusing earlier-generation spares.
  • Check the coupling rating and vehicle-trailer combination before selecting the required service components.

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