This grade 8.8 alloy steel PV rail bolt stands out for its high tensile strength and load-bearing capacity, thanks to the 40Cr alloy steel material and quenched and tempered heat treatment process. The strength grade of 8.8 ensures a minimum tensile strength of 800MPa, allowing it to withstand heavy dynamic and static loads from solar panels, rails and brackets. The metric fine thread provides tighter engagement with pre-drilled holes in thick solar rails, reducing the risk of loosening due to vibration or dynamic loads. The hex head design allows for easy tightening with standard wrenches or power wrenches, speeding up installation time on large construction sites. Unlike standard carbon steel bolts, this alloy steel bolt offers better fatigue resistance, ensuring it remains secure over the long service life of the solar system. The black oxide coating provides basic corrosion protection for sheltered outdoor or indoor solar projects, reducing maintenance requirements.
The bolt follows DIN 931 standard, with the main material being 40Cr alloy steel, which undergoes quenching and tempering heat treatment to achieve high strength and toughness. The strength grade is 8.8, with a minimum tensile strength of 800MPa and a yield strength of 640MPa, meeting the high load-bearing requirements for large-scale commercial solar mounting systems. The surface finish is black oxide coated, which forms a thin protective layer on the surface, providing 300+ hours of salt spray corrosion resistance for sheltered outdoor or indoor applications. The thread type is metric fine thread, with pitch ranging from 1mm to 2mm based on different nominal diameters, providing tighter engagement and better resistance to loosening. The drive type is hex head wrench, compatible with standard 13mm to 30mm wrenches and power wrench attachments. The diameter range covers M10 to M20, with nominal diameters from 10mm to 20mm, and the length range is 50mm to 200mm, available in 10mm incremental length options to fit thick solar rails and heavy-duty brackets. The head style is standard hexagonal head, with a width across flats matching the corresponding wrench size, and the hardness is controlled between HV 300 and 350 to balance strength and toughness.
This grade 8.8 alloy steel PV rail bolt is primarily designed for heavy-duty commercial solar mounting systems, including large-scale ground-mounted solar farms, industrial rooftop solar projects and solar power stations. It is suitable for fastening thick aluminum or steel solar rails to heavy-duty mounting brackets made of steel or cast iron. It performs well in sheltered outdoor environments such as indoor solar test facilities or covered rooftop solar projects, where basic corrosion resistance is sufficient. Installation requires a standard hex wrench or power wrench, making it easy to use on large construction sites with high installation efficiency. It is compatible with most mainstream commercial solar mounting kit brands, ensuring seamless integration with existing solar rail and bracket systems, and can handle the heavy loads associated with large-scale solar panel arrays.
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