12-14X1 1/4 Hex Flange Self Drill with Rubber Washer Full Thread Zinc 1000hours Salt Spray (Pack Qty 1,500) BC-1220KWWHC

An unslotted hex head tapping screw with a conical flange and free spinning, captive rubber washer. The underside of the flange in undercut, creating a space for the rubber washer to be seated. Screw has spaced threads and a shorted drill point which drills its own hole When properly installed, this fastener: (a) offers protection against leakage, and (b) minimizes damage to the mating surface caused by contact with a steel washer. Sealing screws may be used to attach roofing or metal walls to steel frames. Ruspert finis