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skip to Dorma RTS 85 Transom Concealed Door Closer Mechanism

Dorma RTS 85 Transom Concealed Door Closer Mechanism

£138.00

(£115.00 ex VAT)

sku: DRTS1
  • Designed for concealed installation within the door transom or header bar
  • Suitable for both single action and double action door configurations
  • Provides adjustable closing speed and latching action for precise control
  • Features a built-in mechanical backcheck to prevent damage from forceful opening
  • Accommodates various closing forces to suit different door widths and weights
  • Compact body dimensions allow for integration into standard profile sections
  • Available in options for both non-hold open and 90-degree hold open applications

Closing Force

Hold Open

Keys Supplied: per lock ( total) total (unless ordering multiple groups)
Additional Keys are available below
Qty:

Shipping From:

When ordering multiple Keyed Alike locks, only 1 set of keys are provided as all additional locks are made to work from that key.

If ordering 4 or more keyed alike locks you can have them set up as different groups. If Required: Let us know the details in the "Specific Key Requirements" field above.

Each group of locks will then receive keys.

The Dorma RTS 85 is a high-performance transom concealed door closer, specifically engineered to be mounted within the header bar of a door frame. This design ensures that the closer mechanism remains entirely hidden when the door is closed, maintaining the architectural lines of the entrance. It is widely utilised in commercial environments, including retail shopfronts and office buildings.

This mechanism is versatile, supporting both single action (opening one way) and double action (opening both ways) doors. It provides smooth, hydraulic control over the door's movement, with dedicated valves for adjusting the closing speed and latching action. A built-in mechanical backcheck is standard, which cushions the door if it is opened with excessive force, preventing impact damage to the frame or surrounding hardware.

Typical applications include:

  • Aluminium shopfront doors and commercial entrances
  • Internal timber doors requiring a minimalist aesthetic
  • Heavy-duty steel door sets in high-traffic areas

As a replacement mechanism, the RTS 85 is designed for straightforward swapping into existing transom preparations. It is compatible with a variety of closing forces to suit specific door dimensions and is available in both hold-open and non-hold-open variants to meet diverse site requirements.

FAQs

Yes, this mechanism is specifically designed as a drop-in replacement for existing Dorma RTS 85 installations. It features the standard dimensions of 328.5mm in length and 94mm in width to ensure it fits into the original transom preparation.

The correct EN size depends on your door's width. Select EN3 for doors up to 950mm, EN4 for doors up to 1100mm, and EN5 for heavy-duty doors up to 1250mm wide.

This mechanism is available with two options: a standard non-hold open version for constant closing, or a version that features a 90-degree hold-open to keep the door positioned when fully opened.

No, this is the replacement mechanism only. It is ideal for replacing a failed unit while retaining your existing arm, pivot, and cover plate hardware.