GALV Convergence Bolt (M12,500mm)

Specifications & Features
Model: Bolt12-20-500-GALV

Geomaster Galvanized Convergence Bolt with integrated bi-reflex Target (Retro-reflective Target Rebar
Adapter), designed for surveying and geotechnical monitoring applications.

1. Key Specifications
1)Bolt Adapter: Leica-style Spigot M12
2)Rebar Diameter: 20mm
3)Overall Height: 500mm
4)N.W.: 1400g
5)Material: Galvanized Steel Rebar (GALV)

2. Corrosion Resistance
Galvanized steel rebar for reliable corrosion resistance in humid and acidic tunnel environments;
hot-dip galvanized (HDG) to ASTM A153 or ISO 1461, suitable for long-term tunnel monitoring.

3. Application
Primarily used in civil engineering and construction, such as tunnel building, to monitor ground or
structural deformation (convergence measurement). Monitoring Prisms or Bi-reflex Targets are
typically mounted onto Geomaster Convergence Bolts.

4. Bolt Adapter
Leica-style Spigot M12, fixed and specifically designed for Leica surveying equipment (Prism Holders,
Bi-reflex Targets) with M12 socket, eliminating the need for a separate adapter.

5. Compatibility
1)Ideal for Geomaster Bi-reflex Targets GRT144-600 series.
2)Fits Geomaster Prism Holders & Targets and Mounting Sets, including GHP1, GHP3, GPR1, GPR113,
GPR121, and GHT112.
3)Compatible with all Leica-style surveying equipment (prism adapters and bi-reflex targets) with
M12 female socket.

6. Protective Cap
Supplied with a white PVC protective cap.
Note: Any updating would be subject to change without prior notice. Ground Anchor

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