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The Fastcap #10 x 3-inch flat head Powerhead screw is a coarse-thread wood fastener designed for assembly work where deeper penetration and greater holding depth are the priority. The oversized flat head, Type 17 Auger point, and TX20 Torx drive work together to seat cleanly and drive reliably through thicker panels, built-up sections, and multi-layer wood assemblies.
At 3 inches, this screw reaches through panel-to-panel assemblies, thick hardwood sections, and built-up framing components where shorter options leave too little thread in the receiving member. It is well suited for joining two layers of 3/4-inch sheet goods with a backing block, fastening heavy cabinet components to structural members, attaching face frames to thicker carcass walls, securing mounting rails or hardware backing in multi-ply constructions, and anywhere the joint depth calls for a screw that buries well past the glue line or mating surface. The coarse thread grips through the full engaged length, making the extra penetration count.
The flat Powerhead design carries a broader bearing diameter than a standard flat head, spreading the clamping force across a larger footprint. The underhead nibs mill a clean countersink in hardwood and dense sheet goods as the screw seats, so the head finishes flush without a separate countersinking step. The Type 17 Auger point opens the path ahead of the threads with a fluted cutting action that pulls chips away from the advancing screw tip. That chip clearance matters most in thick stock, where buildup at the point can stall a standard sharp-point screw before full seating is reached. The TX20 Torx recess locks onto the bit with six-lobe contact, keeping the driver engaged even when the screw is working through resistance deep in the joint.
This screw is a practical choice for cabinet shops, millwork operations, and finish carpenters who regularly work with thicker assemblies and need a flat head screw that seats cleanly without extra prep. The zinc-finished carbon steel construction is appropriate for dry interior environments. Each box contains 150 screws, a quantity suited to production runs and ongoing shop stock rather than single-project use. Fastcap lists this screw under part number PHZ8.3"-150 PC for reordering.
The 3-inch length gives you enough shank to pass through thicker panels or built-up sections and still place substantial thread length into the receiving member. For assemblies involving two layers of material, thick hardwood stock, or a panel face-fastened to a structural backer, the extra length provides holding depth that a 2-inch or 2-1/2-inch screw may not reach.
The Type 17 Auger point has a fluted cutting tip that clears wood fibers ahead of the threads as the screw advances. In thick stock, this chip-clearing action reduces the resistance that builds up when a plain sharp point has to push displaced material aside over a longer drive path. The result is lower driving torque and less risk of splitting near the end grain or face of the receiving piece.
No. The nibs on the underside of the Powerhead mill their own countersink in most hardwoods and wood-based panels as the screw is seated. A pre-drilled countersink is not required in those materials, though a pilot hole is still recommended in hardwood to control splitting along the shank.
The zinc finish on this screw is suited for dry interior work. It is not rated for exterior, high-humidity, or treated-lumber environments. For outdoor or pressure-treated applications, select a screw with a coating rated for that exposure.
This screw uses a TX20 Torx drive. A T20 star-drive bit is required for installation. Attempting to drive it with a Phillips or square bit will damage the recess.
When the assembly calls for depth, the Fastcap #10 x 3-inch Powerhead screw delivers a flat head that seats flush, a point that clears the path, and a Torx drive that holds through the full pull — all in a box of 150 ready for the next run.
Sold In: 1 Box