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Cold-rolled Flat Steel Screw Used

Screw selection should be based on the life of flat steel used fixed and cannot be altered, and especially the outer material life and specifying fixed part of life is consistent. Bearing in mind the thickness of steel Purlin cannot exceed the self drilling screw capacities. Supply of screws with plastic top cover, stainless steel or coated with a special layer of durable protective coating. In addition, apart from the dark to fasten with screws, other screws with waterproof gaskets and lighting under wind pressure and special cases with a corresponding special gaskets.