Put the ThruLOK-Washer on the ThruLOK screw with the teeth of the washer facing away from the head of the fastener. No predrilling required when properly installed. Using a 1⁄2" high torque variable speed drill (18V if cordless), drive the ThruLOK until washer and hex head are just above the wood surface (approx 1⁄4") and point of screw protrudes out other side of connection. Thread the ThruLOK-Nut onto point of fastener. Hand tighten nut until flush with wood. Tighten screw with drill. Repeat to match code-compliant fastening pattern.
Using an Impact driver or high torque ½” variable speed drill (18V if cordless), drive the ThruLOK until the pre-installed washer and hex head are almost flush against the wood surface. On the opposite side, thread the ThruLOK nut onto the exposed point of the fastener and firmly hand tighten. Finish by driving the screw until washer and nut are snug.
NOTE: Point of fastener must engage in ThruLok-Nut to “MIN” line or beyond.