Dorma Floor Spring BTS75V EN1–4 with Backcheck
The Dorma BTS75V is a universal, non-handed double action floor spring with adjustable EN1–4 spring strength and integrated mechanical backcheck. It is designed for single and double action doors where controlled closing and protection against forced opening are required.
Key Features
- Adjustable spring strength EN1–4 for flexible door sizing.
- Mechanical backcheck to protect doors from forced opening.
- Universal non-handed design for left or right hand doors.
- Available in hold-open and non-hold-open configurations.
Specifications
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Suitable Uses
- Single and double action doors.
- Commercial doors requiring adjustable closing force.
- Doors exposed to wind or high traffic requiring backcheck.
Available Variants
Item Code Family
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Frequently Asked Questions
Is this floor spring fire rated?
No. The BTS75V floor spring is not fire rated.
What is the advantage of mechanical backcheck?
Mechanical backcheck slows the door before full opening, helping protect the door and frame from impact.
Can the spring strength be adjusted on site?
Yes. The BTS75V allows on-site adjustment within the EN1–4 range.
Additional Information
- The BTS75V is selected where adjustable spring force and backcheck are required.
- Hold-open variants should not be used on fire or smoke doors unless paired with an approved release system.
- Commonly specified in Australian commercial door installations.
