TN screws are used for metal structures up to 0.7 mm thickness, and TB screws are used for thicknesses from 0.7 to 2.5 mm. They are manufactured in lengths of 25 and 35 mm.
Gypsum Board to Frame Screws (TN-TB)
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Description
Sharp-point TN screws are used to attach gypsum boards to metal frames up to 0.7 mm thick, while self-drilling TB screws are used for thicknesses greater than 0.7 mm (up to 2.5 mm). TN and TB screws are produced in lengths of 25 mm and 35 mm in this factory.
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Frame to Frame Screws (LN-LB)
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