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The FastCap #10 x 3-1/2 inch PowerHead Screw is a flat head, coarse-thread wood screw built for assemblies where shorter fasteners fall short. The broad PowerHead, Type 17 Auger point, TX20 Torx drive, and underhead nibs work together to deliver a clean, flush result in thick lumber, built-up panels, and deep-pocket joinery.
At 3-1/2 inches, this screw is sized for jobs where a standard 2 or 2-1/2 inch fastener cannot get enough thread into the receiving member. Think laminated beams, stacked framing lumber, thick cabinet carcass sides, wide face-frame stock over thick panels, or any built-up assembly where the screw needs to travel through one thick layer and still bite deep into another. The coarse thread and Type 17 Auger point handle the long drive without bogging down, and the PowerHead with nibs finishes the countersink cleanly on the way in so the head sits flush rather than proud.
The screw is carbon steel with a zinc plating that suits dry, climate-controlled interiors. Woodworking shops, cabinet assembly, millwork staging, and general interior carpentry are the right environments for this finish. The zinc coating is not rated for exterior exposure, pressure-treated lumber contact, or high-humidity settings, so keep it on the indoor side of the build. The flat head profile with underhead nibs is designed for wood and wood composites where the head needs to countersink and sit level with the face surface.
Cabinet shops building deep carcasses or laminated components, framers tying thick interior assemblies, and finish carpenters anchoring through multiple layers of stock are the buyers who run through a box of these. The 100-piece pack is sized for project-level use rather than bulk production, which suits contractors pulling a specific size for one phase of a job or shops keeping a working supply of longer fasteners on the bench without committing to a high-volume pail.
The 3-1/2 inch length gives the screw enough shank to pass through a thick top layer and still get solid thread engagement in the receiving member beneath. For single-layer stock under about 1-1/2 inches, a shorter size is usually the better fit.
The Type 17 Auger point has an extended flute that clears wood fibers as the screw drives, reducing the torque required to reach full depth and lowering the risk of splitting in dense or thick stock. A standard sharp point does not have that chip-clearing channel.
The underhead nibs are designed to mill the countersink as the screw seats in wood and wood composites, so a separate countersink operation is often not needed. Results vary by material hardness and grain.
No. The zinc plating on this screw is intended for dry interior use. For exterior work or direct contact with pressure-treated lumber, a screw with a corrosion-resistant coating rated for those conditions is the right choice.
A T20 Torx bit fits this screw. The six-lobe recess is designed for positive engagement under power-tool torque with low cam-out risk.
When the assembly is deep and the fastener needs to stay flush, the FastCap #10 x 3-1/2 inch PowerHead Screw delivers the length, the drive, and the head geometry to finish the job cleanly in one pass.
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