Aluminum Survey Markers for Rebar
Our aluminum property markers make for fast and easy installation, helping land surveyors lower costs in the field. These long-lasting survey caps are specially designed to hold tight when driven onto rebar, avoiding metal corrosion.
Aluminum Survey Markers that are Perfect for Land Surveying
Our aluminum survey markers for rebar with SureGrip plastic insulators are another first from Berntsen that, make good sense.
Feedback from our customers told us that: a good survey cap would not "wobble" when tapped on the rebar.
Berntsen's survey corner markers have a deep hex socket and are orbital forged from 6000 series aluminum. We offer a better design than a simple tapered cone socket, as well and a significantly stronger aluminum alloy than the 99% pure aluminum that other manufacturers use for survey caps.
The 6000 series aluminum used in Berntsen survey markers is the same alloy family used for the rods in our rotating rod monument system. When rods are driven to refusal, they have to be super tough. So are Berntsen metal rebar caps.
Aluminum Survey Caps that won't Corrode
A good metal property marker must virtually eliminate dis-similar metal corrosion. Surveyors know that aluminum attached directly to rebar or pipe would loosen in a short period of time. This confirms metallurgical theory.
Aluminum is less "noble" than steel, and an electrical current will actually flow from the aluminum (+) to the steel (-). Corrosion will occur in the anode (+) area of this battery like a combination of metals in the presence of moisture (air or soil acting like an electrolyte).
Berntsen originated the SureGrip insulator technology, which effectively isolates the aluminum from the steel and de-forms around the ribs of the rebar. The hex-shaped socket fills with the deformed plastic material, and the cap is locked on with a super-tight compression fit. Great force is required to remove the cap.
Our aluminum material is versatile and resistant to most environmental conditions, however, if the survey markers are intended to be used in high traffic or caustic environments, such as roadways or salty conditions, we highly recommend using bronze survey markers to improve the lifetime of the markers.
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How to install Berntsen Survey Markers
Tools: Berntsen suggests these tools to help with your installation.
Pre-Installation: Save time in the field with a little preparation in your shop.
- Cut your rebar to your desired length using a hacksaw or power press.
- Remove any burrs and/or mushrooming on the end that will be receiving the survey marker
- For maximum grip, bevel the end of the rebar that will be receiving the survey marker
Installing the Rebar
With a felt-tip permanent marker, place a mark about 1½" from the end of the rebar. This mark will be your guide to assure the cap is tightly and completely seated on the rebar.
Drive your rebar to the desired depth. Remember to leave enough rebar to install the survey marker.
Installing the Aluminum Survey Marker:
To restrict any "sinking" of the rebar into the ground when applying the survey marker, clamp a vice-grip pliers to the rebar at ground level. The handle of the pliers will prevent the rebar from sinking into the soil as you drive on the survey cap.
Some surveyors pre-install the survey marker onto the rebar prior to entering the field and then drive the rebar and marker assembly with a urethane faced dead-blow hammer.
Once you have your rebar and cap to the desired depth your installation is complete. For more details about using Berntsen survey rebar caps, view our installation instructions here.