Solar PV mounting bracket screw selection guide:
1. Material Selection
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Stainless 304: General environment, cost-effective
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Stainless 316: Coastal areas, salt spray resistant
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Hot-dip galvanized steel: Large ground stations, cost advantage
2. Strength Grades
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Grade 5.8: Light brackets, rooftop PV
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Grade 8.8: Medium brackets, general ground stations
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Grade 10.9: Heavy brackets, high wind load areas
3. Corrosion Protection
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Normal environment: Stainless or electro-galvanized
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Coastal areas: 316 stainless or hot-dip galvanized
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Chemical environment: 316L stainless
4. Common Sizes
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M8×30, M8×40: Module clamp fixing
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M10×50, M10×60: Rail connection
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M12×60, M12×80: Bracket foundation fixing
Selection should consider installation environment, load requirements, service life, and other factors.
