This adjustable 316 stainless steel PV foundation bolt stands out for its excellent corrosion resistance, thanks to the 316 austenitic stainless steel material and electropolished surface finish, which provides 1500+ hours of salt spray corrosion resistance, making it suitable for harsh coastal and high-salt environments. The adjustable washer design allows for minor alignment adjustments during installation, compensating for minor errors in foundation pile positioning, ensuring that solar rails and brackets are installed correctly and evenly. The hexagon socket drive design provides tight fastening without slipping during installation, while the metric coarse thread ensures stable engagement with foundation pile nuts. It has a strength grade of A4-70, ensuring it meets the high load-bearing requirements for large-scale ground-mounted solar farms. Unlike standard foundation bolts, this adjustable model offers greater installation flexibility, reducing the need for precise foundation pile positioning and saving on-site installation time and labor costs.
The bolt follows GB/T 5782 standard, with the main material being 316 austenitic stainless steel, which offers excellent corrosion resistance in high-salt and harsh outdoor environments. The strength grade is A4-70, with a minimum tensile strength of 700MPa and a yield strength of 450MPa, meeting the high load-bearing requirements for large-scale ground-mounted solar farms. The surface finish is electropolished, which smooths the surface of the bolt and removes free iron, providing 1500+ hours of salt spray corrosion resistance. The thread type is metric coarse thread, with pitch ranging from 1.5mm to 3mm based on different nominal diameters, providing stable engagement with foundation pile nuts. The drive type is hexagon socket, compatible with standard 10mm to 19mm Allen wrenches for easy installation. The diameter range covers M12 to M24, with nominal diameters from 12mm to 24mm, and the length range is 100mm to 300mm, available in 20mm incremental length options to fit different foundation pile depths. The head style is round head with adjustable washer, which allows for ±5mm of alignment adjustment during installation, and the hardness is controlled between HV 220 and 270 to balance strength and toughness.
This adjustable 316 stainless steel PV foundation bolt is primarily designed for large-scale ground-mounted solar farms, utility-scale solar projects and industrial solar mounting systems. It is suitable for fastening solar rails and brackets to concrete or steel foundation piles, providing a secure and flexible fastening solution. It performs exceptionally well in coastal areas, high-salt environments and regions with frequent rain and snow, as the 316 stainless steel material and electropolished surface finish prevent rust and corrosion over time. The adjustable washer design allows for minor alignment adjustments during installation, compensating for minor errors in foundation pile positioning, reducing the need for rework and improving installation efficiency. Installation requires a standard Allen wrench or power drill with an Allen bit, making it easy to use on large construction sites. It is compatible with most mainstream solar foundation system brands, ensuring seamless integration with existing solar mounting systems.
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