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Big Timber - 25 Count - #15 x 4-1/2" WTX: Wafer Head Lag ScrewHeat-treated hardened steel for high tensile strength and high shear strength. ACQ Compatible ruspert coating in an attractive matte black finish useful with many brands of outdoor or indoor decorative hardware. Deep six-lobe star drive recess reduces cam-out end load.
Handles 2X the torque as Phillips or Square Drive while extending the life of the bit. Aggressive knurl enlarges hole to reduce splitting and drag to help draw lumber together. V-cut notches on threads to cut fibers for easier insertion at lower torque. Type 17 tip for faster precise starts which eliminate "walking". (Provides easier insertion without pre-drilling) Built-in flat washer head to increase pull through strength and leaving behind a smooth flush head. Aggressive thread for great withdrawal strength. Structural lag screw backed by certified independent testing (TER1911-04).COMMON USES INCLUDE: Log Construction, Timber Frames, Laminated Beams, Girders, Ledger Boards, Stair Rails, Deck Posts, Fencing, SIP Panels (Structural Insulated Panels), Pole Barns, Pergolas. Decorative Black HardwareNOTE: Always follow lumber manufacturer's recommendations.