Ringfeder® trailer coupling RF40 AM/RL

The new generation of the air-assisted all-rounder for light to medium transportation

Semi Assisted
Semi Assisted
Fixed + Articulated
Fixed + Articulated

Ringfeder® trailer coupling RF40 AM/RL ,


A convenient quick operation air opened 40mm trailer coupling for hinged or rigid drawbars. It is ideal for general transportation operations where heavy-duty wear is not required. The self-closing and automatically secured coupling provide high safety and long-term reliable performance. The pneumatic opening makes it ergonomic, time-saving and improved productivity for the driver.

A robust and easily maintained safety device adds further to safety.
The coupling is equipped with a reinforced guiding funnel which is easily replaceable.

For remote locking indication (red/green) you can choose between an indication outside the driver's cabin or inside the driver's cabin, either by the RINGFEDER® instrument panel or the truck instrument cluster.
The remote indication will be connected to the Coupling Sensor Module (CSM) which is included in the coupling. The respective indication kits must be ordered separately.


Locking mode is shown by a built-in LED light indicator, and the signal (red/green) is clearly visible also in the dark. By connecting a passive fibre optic cable to the indicator, the signal be displayed on any location, e.g. on the side of the vehicle.



By the RINGFEDER indicator panel, locking mode (red/green) is conveniently displayed in the cab. Alternatively, the locking indication can be shown in the vehicle's own display, if supported by the vehicle manufacturer.

Choose variant


The Original Wireless Solution

Ringfeder Red Line (AM/RL)

Fast and ergonomic
The Ringfeder original air mechanism / Red Line adds a convenient pneumatical opening, with 50% higher closing power compared to a standard coupling. Air assisted operation makes coupling and uncoupling significantly faster and more ergonomic for the driver.

Works with your current installation
Connect your Ringfeder AM/RL coupling to the existing compressed air supply of your truck, and operate with your control unit of choice. No installation of a separate compressed-air line needed. Compatible with Duomatic, Palm, C-coupling and Valve box.

Why should I choose this?

This Ringfeder coupling is an ECE certified high-quality product that requires minimal service and maintenance. It is easy to operate, and you will have the most reliable performance. Full support and global spare part availability, together with long, trouble-free service life, provides the excellent Ringfeder value to owners and users.

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A high-quality product
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Easy to operate
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The most reliable performance
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Full support and spare part availability
RF oiler.


Avoid tricky manual lubrication and extend product life by the Ringfeder Automatic Oiler.

Documents / Manuals

Are you missing a certain document?

You will find all documents under Support.

Go to support