About

Product Details

Robust, especially cheap and for many years proven prism with nearly indestructible tilt holder made of plastic, which performs consistently for the harsh conditions in tunnel and monitoring purposes.

The centering of the prism is within 2 tenths of a millimeter. Robust clamp screw for the vertical axis, the unintentional rotation of the prism effectively prevented. The mounting of the tilt axis is deliberately kept too tight to avoid accidental tipping.

Fixing Accessories

Product	Connection / Specification	Description & Application
5KBW Convergence Bolt – 12 mm Leica Adapter	12 mm Leica-style connection	Galvanized steel convergence bolt with an integrated 12 mm Leica-style mounting connection. Designed for installing compatible monitoring prisms in concrete tunnel linings.
5KB Convergence Bolt – 3/8" Male Thread	3/8" male thread	Standard galvanized steel convergence bolt for permanent installation. Compatible prisms can be mounted using the 46-VA connection adapter with a sacrificial breaking point.
Convergence Bolt Connection Accessories	3/8" bolt accessories	Connection components for mounting compatible monitoring prisms to 3/8" convergence bolts. Includes 46-VA connection adapters and related mounting accessories.
Convergence Bolt Protection Ring	Welded steel protection ring	Protects installed convergence measurement points from mechanical impacts and falling debris. Particularly useful in tunnel construction environments involving blasting. Optional protective plugs provide additional protection during shotcrete application.
Welding / Magnetic Leica Adapter	12 mm Leica-style connection	Mounting adapters for attaching compatible monitoring prisms to steel structures. Available configurations support welded or magnetic attachment methods, including models 46-1300W, 46-2016W, and 11R10-W.
Beam Clamp – M8 Female Thread	M8 female thread Clamping range: 0–23 mm	Galvanized steel clamp for mounting monitoring prisms to steel beams, lattice structures, sheet piles, and other suitable structural members using compatible adapters.
11R Wall Bolt – M8 Female Thread	M8 female thread	Economical mounting solution for installing monitoring prisms in concrete, rock, or masonry. Used with compatible threaded prism adapters. Available in multiple configurations within the 11R series.
M8-to-Leica Wall Bolt Adapter	M8 male thread to 12 mm Leica-style connection	Connects compatible monitoring prisms with Leica-style mounting sockets to 11R series wall bolts. Available in different materials and configurations, including 46-VA-M8, 11R5-W, and 11R5-W-VA.