Dormakaba BTS 65 Floor Spring

The Dorma BTS 65 is a high-performance, concealed floor spring designed specifically for double-action doors. Balancing economic efficiency with German-engineered reliability, it has become the industry standard for commercial and residential glass or timber doors. Its “hidden” nature allows the door’s design to take center stage, providing a clean, minimalist aesthetic without compromising on control or safety.

Key Product Highlights

1. Ultra-Slim Profile for Modern Construction

One of the most significant advantages of the BTS 65 is its incredibly shallow housing. With a total installation depth of only 40mm, it is designed to fit into thin floor slabs where deeper floor springs would encounter structural reinforcement or underfloor heating. This makes it a favorite for modern high-rise developments and renovation projects.

2. Versatile Door Control

The BTS 65 is not a “one-size-fits-all” closer; it is built for precision. It features two independent regulating valves that allow for granular control over the closing speed.

• Valve 1: Controls the wide sweep from 130° to 0°.
• Valve 2: Adjusts the closing force in the 130° to 20° range, ensuring the door closes securely even against wind pressure or stack effect in large buildings.

3. Rugged Durability & Load Capacity

Engineered for longevity, the BTS 65 is capable of supporting doors weighing up to 100kg. It is available in two power sizes to suit different architectural needs:

• EN 3: For doors up to 950mm wide.
• EN 4: For doors up to 1100mm wide. The internal cast-iron body is housed in a zinc-plated steel cement box, providing superior protection against moisture and debris.

4. Integrated Hold-Open Functionality

For retail environments or office corridors where constant foot traffic is expected, the BTS 65 offers an optional 90° hold-open. This allows the door to remain fixed at a right angle, facilitating easy movement of goods or high volumes of people without manual intervention.

5. Weather-Resistant Performance

The hydraulic fluid used in the BTS 65 is specifically formulated to maintain its viscosity across a wide temperature spectrum. This ensures that the door’s closing speed remains consistent whether it is the peak of summer or the dead of winter, reducing the need for seasonal maintenance adjustments.