The new turnbuckle for the construction industry

What is the BT-Spannschloss®?


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Technical Data

What is the BT-Spannschloss®?

The BT-Spannschloss® is a turnbuckle which is part of an innovative clamping system including screw connections and anchors embedded in prefabricated concrete parts.

With the BT-Spannschloss® it is possible to create efficient, precise assemblies and make durable construction connections of prefabricated concrete parts in the easiest possible way where there is predominantly static load in the direction of the tensile and shear forces.
The BT-Spannschloss® is suitable for bearing major loads due to its specific form and the heavy-duty cast material used for manufacture. In April 2010, the BT-Spannschloss® was awarded the general building regulations authorisation (no. Z-14.4-599) by the German Institute for Building Technology [DiBt], which means the basis for static verification of the selected construction connection was also established. The BT-Spannschloss® is available in three sizes (M20; M16; M12) and can be purchased in uncoated or galvanised form.

Why the BT-Spannschloss®?

The BT-Spannschloss® means that prefabricated concrete parts can be connected without any additional materials or resources.
Without any need to comply with cure times, the connection can immediately bear a full load and thus generates significant time and cost savings in comparison to other established systems.

Area of application

The BT clamping system can be used efficiently and universally in the widest possible range of applications. For instance, in the assembly and connection of angle brackets and shaft elements for road building and underground construction, in building operations in the field of coastal protection, in floor and wall connections for the residential and commercial construction field and many more construction connections for prefabricated concrete parts.

Note: The load bearing capacity of the clamping system depends to a significant extent on the type of anchor used. Several types of authorised anchorage systems can be used according to the application requirements (you can find the data in the manufacturer’s instructions).
In general, the load bearing capacity of the clamping system is many times higher than that of the anchorage system.


Officialy approved

The BT-Spannschloss® is approved by Deutsches Institut für Bautechnik in April 2010.