Unslotted Indented Hex Washer Head, Zinc Plated w/Bonded NEO-EPDM Washer. Unslotted Indented Hex Washer Head, Zinc Plated w/Bonded NEO-EPDM Washer. This self-drilling screw drills a hole and taps a thread in a single operation. The drilling point must fully penetrate all pieces of material being fastened before the first thread engages.  The washer and hex head are formed together as one piece. The bonded NEO-EPDM washer creates a leek proof seal when the screw is properly installed. Application: Attaches metal to metal. Drill Capacity (in.): .060 - .220 Installation: A 3/8” hex nut setter or 3/8” drive socket with torque limiting nose piece set at a maximum of 1750 RPM drive speed recommended. Do not over torque as it can cause the head to snap or stripping of the threads. Installed fasteners must penetrate a minimum of three full threads beyond the metal structure. Specifications: • Meets ASTM1 C 1513 for cold-formed steel framing connections • Meets ASTM A 510 for carbon steel manufacturing • Manufactured to SAE2 J78 for dimensional specifications • Meets F.I.P.3-1000.7 for torsional strength and drill speed • Meets ASTM F1941 for corrosion resistance • ICC-ES Evaluation Report: ESR-3528