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Drive
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The recess or external shape used by a driver bit, screwdriver, socket, or wrench.
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Head
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The upper portion of a fastener that bears against the work surface or hardware.
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Shank
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The body of a fastener between its head and its point or end.
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Thread
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The helical ridge that engages material or a mating threaded component.
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Pitch
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The spacing between threads. Coarse and fine pitches suit different materials and fastening systems.
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Gauge
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A sizing reference commonly used when describing screw or nail diameter.
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Pilot Hole
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A pre-drilled hole that guides the fastener and can reduce splitting or excessive driving resistance.
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Clearance Hole
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A hole large enough for the screw shank to pass through the first material without thread engagement.
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Countersink
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A tapered recess designed to receive a compatible tapered fastener head.
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Flat Head
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A tapered screw head designed to sit in a compatible countersunk recess.
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Pan Head
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A screw head with a rounded upper profile and generally flat bearing surface underneath.
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Washer Head
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A broad head form intended to distribute bearing force over a wider surface.
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Hex Head
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An externally driven head typically installed with a wrench, socket, or nut driver.
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Phillips
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A cross-shaped screw drive commonly encountered in general hardware applications.
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Torx
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A six-lobe drive pattern designed to provide positive engagement with a matching driver.
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Slotted
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A single straight recess driven with a correctly sized flat-blade screwdriver or bit.
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Coarse Thread
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A thread form with wider spacing between adjacent threads.
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Fine Thread
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A thread form with closer spacing between adjacent threads.
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Smooth Shank
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A nail body with a relatively smooth surface between the head and point.
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Ring Shank
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A nail shank formed with annular ridges intended to increase withdrawal resistance in compatible applications.
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Brad
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A thin finishing fastener with a small head commonly considered for light trim work.
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Finish Nail
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A slender nail with a relatively small head intended for suitable finish and trim work.
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Self-Drilling
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A screw design with a point capable of creating its own entry in compatible materials.
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Corrosion Resistance
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The ability of a fastener material or finish to withstand environmental exposure and corrosion.
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Clamping Force
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The force drawing joined components together as a compatible screw or bolt is tightened.
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Withdrawal
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Force acting along the fastener axis in a direction that tends to pull it from the substrate.
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Shear
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Force acting across a fastener rather than directly along its length.
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Embedment
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The depth a fastener penetrates into the receiving material.
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Thread Engagement
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The amount of fastener thread effectively engaged with the receiving material or mating thread.
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Edge Distance
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The distance from the fastener location to the nearest edge of the material.
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Fastener Spacing
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The distance between neighboring fasteners in an assembly.
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Overdrive
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Driving a fastener beyond its intended seating position.
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Cam-Out
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The tendency of a driver bit to slip or climb out of the screw recess under torque.
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Bit Fit
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The precision with which a driver bit matches the fastener drive pattern and size.
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Pre-Drill
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Preparing a pilot, clearance, or other required hole before installing the fastener.
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Seating
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Bringing the fastener head to its intended final position against or within the work surface.