Structural Wood Screw bodySimpson Strong-Tie introduces the new SDWF structural wood screw with TUW take-up washer. The SDWF-TUW kit is faster and easier to install than other floor-to-floor connection methods. The unique design of the SDWF fastener enables it to attach upper and lower walls together from the top, spanning the floor system and providing an easy-to-install connection within the continuous uplift load path of the structure. The interlock between the tabs of the take-up washer and the threads under the head of the SDWF prevent the screw from sliding back under load. For more information, visit