#15 Black Wafer Head Structural Lag Screws. Used for Log Construction, Timber Framing, Laminated Beams and Pole Barns Among Other Uses. T-30 Torx/Star Drive – Screw Length:#15 X 3-1/2″ Black Wafer Head Structural Lag Screws – Package Quantity:50 COUNT BOX

Description#15 Black Wafer Head Structural Lag Screws. Used for Log Construction, Timber Framing, Laminated Beams and Pole Barns Among Other Uses. T-30 Torx/Star Drive✔Dimensions: Shaft diameter ~.202″ – Head Diameter ~.644″ – T30 Torx/Star Drive✔ACQ Compatible Ruspert coating for outdoor or indoor use✔Aggressive knurl enlarges hole to reduce splitting and drag to help draw lumber together✔Type 17 Tip for Fast Starts and Eliminate Walking Without Having to Pre-Drill✔”V-Cut” Notches on Thread Designed to Cut Through Material for Easy Installation at low torque speed✔Flat Head Washer Increases Pull Through Strength and Leaves Flat Surface✔Deep Six-Lobe Star Drive Recess reduces cam-out – Handles 2X the torque as Phillips or Square DriveCoated for use With ACQ Lumber and Against Corrosion. These Screws can be Used Either for Interior or Exterior Work. Uses Include Fencing, Log Construction, Pole Barns, Deck Posts, Ledger Board and Many Other Uses. Aggressive Knurl Works to Reduce Splitting and Drag While Drawing Timbers Together. Use With a T-30 Torx/Star Bit.Need a T30 Torx/Star Drive Bit