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Description
Composite Decking Screw with Under-Head Retaining Threads and Torx Drive (Fischer FT-S / Decking Screw)
A specialized dual-function wood and composite screw featuring reverse under-head threads and a compact head, engineered specifically for installing solid or hollow composite decking boards (WPC) without surface mushrooming.
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Under-Head Locking Threads: Inverse threads located directly beneath the head push surface material back into the hole, eliminating composite board bulging, mushrooming, or raised edges.
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Small Cylindrical/Trim Head: Narrow head design sits neatly flush or slightly sub-surface with composite boards for a clean, concealed finish.
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Torx / Star Drive (TX): Deep star recess delivers optimal power transmission and prevents driver bit slip or strip-out during continuous installation.
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Shank Reaming Section: Intermediate friction-cutter ribs clear material debris from the drill hole, reducing driving torque and stress on the power tool.
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Coarse Thread with Self-Tapping Tip: Deep thread pitch and sharp point ensure immediate engagement and high holding strength into timber or composite substructures.