Description
Kovervit® AA
Chromiting®
for wood
Screw for fixing various conglomerates, laminated wood, chipboard panels, wood-metal “sandwich” structures, fibreglass and thin sheet metal, to wood without a pilot hole.
HEXAGONAL HEAD
sharp-edged, with a hollow collar, designed to house the elastic washer against the infiltration of water.
AA LARGE PITCH THREAD
for quick screwing, ideal for wood and light structures.
TIP
pointed tip with an angle of 30°, suitable for penetrating easily into any low-density material. The thread right to the end and the hardness of the steel allow direct drilling of the roofing sheets, thus eliminating the need for a pilot hole.
CARBONITRIDING HEAT TREATMENT
Gives the screw the following two characteristics:
– an extremely hard surface, necessary to drill and tap the materials to which it is screwed;
– tough elastic core, necessary to prevent breakage of the screws.
It has twice the break resistance of a common hex lag screw, even though it has a larger diameter.
More info: heat treatment
CHROMITING® GALVANIC TREATMENT
of an iridescent colour, it ensures much more effective protection against rust than all normal galvanizing treatments. Complies with the EN1670 standard grade 4.
More info: finishing treatments
LUBRICATION
More info: Lubex® lubrication
CE MARKING
Of the assembly elements for constructing wooden weight-bearing structures, in accordance with the EN 14592:2009 standard (granted by the CSTB Centre Scientifique du Bâtiment, in Paris). Issue of the DoP (Declaration of Performance), in accordance with the European Construction Regulation no. 305/2011.
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- Application of the Kovervit® AA screw whose hollow collar is designed to house the elastic washer against the infiltration of water. The AA large-pitch thread is also ideal on wood and light metal structures.
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- Kovervit® AA applied to the metal collar.
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- Kovervit® AA applied to a wall-mounted bracket.
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- Section of the screw that shows the characteristics of the carbonitriding treatment.
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- Graph comparing the tightening torque of a Kovervit® screw lubricated with Lubex® with an unlubricated hex lag screw
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- Sales box
