Double-threaded screws (also known as double-threads) are mounting elements that are commonly used in the PV industry. They are used to mount photovoltaic panels on building roofs. The double-threaded screw should be made of corrosion-resistant materials, such as stainless steel, to serve for many years in difficult environmental conditions, ensuring full stability of the attachment. Are you planning to install PV panels and do not know which double-threaded screw to choose? Take advantage of the advice of Onninen experts and conveniently order the products you need.
Check out the double-threaded screws at the Onninen wholesaler
How to choose the right size of double-threaded screws for photovoltaics?
Double-threaded screws for mounting PV structures have two types of threads. The first allows screwing into the rafters through the roof covering, and the second – metric – is used to screw rails and brackets. The available models differ in several key parameters, primarily length and diameter/size of the metric thread. Popular variants are:
For fastening the mounting profiles of the PV installation, mainly double-threaded M10 screws of various lengths are used. The screw with M10 thread is used to fasten the structure to the roof covering, including on a roof covered with sheet metal, metal roofing tiles, roofing felt or bituminous shingles.
Rooftop photovoltaic installation with double-threaded screws
Photovoltaic panels are mounted on roofs using various types of fasteners. The base is long double-threaded screws. They ensure that the entire structure holds the truss and frame stably. The double-threaded screw set usually includes: a set of nuts, a gasket and a mounting adapter. Gaskets ensure the tightness of the hole made in the roof covering. Nuts support the optimal distribution of forces over a larger surface and prevent deformation of the roof covering. The adapter allows you to connect the screw to the mounting profile and is used to level the structure. An additional element is spring washers, which strengthen the durability of the connections in the face of difficult weather conditions.
The photovoltaic panels and the aluminum frame must be attached in such a way that they can withstand strong gusts of wind. Therefore, widened nuts and hexagonal head screws with a conical collar are recommended for mounting the system. In addition, the double threads must be matched to the specific type of rafter (wood/steel).
Regardless of the type chosen, the fasteners for attaching photovoltaics to the roof should be characterized by maximum resistance to corrosion, abrasion, impact and cracking, UV rays and ozone, and low and high temperatures. It is worth remembering that the PV installation interferes with the body of the building, so certified products made of materials with confirmed properties should be used for its installation.
When should studs be installed on a roof?
Double-threaded screws are versatile fasteners. They are primarily used for mounting photovoltaic systems, but are also suitable for mounting other structures on roofs, such as snow guards. They are useful wherever absolute strength, stability and tightness of the connection are required.
Double-threaded screws at the Onninen wholesaler
In the Onninen electrical installation wholesaler you will find steel double-threaded screws in various sizes, designed for the installation of photovoltaics on pitched and flat roofs. All products have corrosion-protected surfaces. In our permanent offer we also have Allen, lock and hammer screws, nuts and many other fasteners. Our customers include shops, photovoltaic services and installation companies, as well as private investors planning to produce energy from the sun for their own use.
Check out the double-threaded screws at the Onninen wholesaler