✓ In stock The South Mountain Supply 17650 is a #8 x 3/4" Phillips round washer head Tek screw with a phosphate black finish. The built-in washer head distributes clamping force across a wider area, making this screw ideal for automotive trim, sheet metal, and body panel fastening applications. Specifications Type: Phillips Round Washer Head Tek Screw Screw Size: #8 Length: 3/4" Head Style: Phillips Round Washer Washer Head Diameter: 7/16" Point Type: #2 Drill (Tek) Finish: Phosphate Color: Black Pack Sizes Available: 50, 100, 200, 300 Vehicle Fitment Universal — suitable for automotive trim, sheet metal, and body panel fastening on all makes and models Cross-Reference Numbers SMS Part#: 17650 What is a Tek screw and when is it used in automotive work? A Tek screw (self-drilling screw) has a drill-tip point that creates its own pilot hole as it drives into sheet metal. In automotive applications, the 17650 is commonly used for attaching trim brackets, heat shields, splash guards, and light-gauge sheet metal panels without the need for a separate drill bit or pre-tapping. Why does this screw have a round washer head? The round washer head integrates a wide-diameter bearing surface directly under the screw head. This distributes the clamping load over a larger area, preventing the screw from pulling through thin or soft material and providing a neater, more finished appearance on visible trim applications. Is the phosphate finish rust-resistant? Phosphate is a conversion coating that provides mild corrosion resistance and excellent adhesion for paint or oil. For automotive underhood and trim applications where the fastener is shielded from direct water exposure, phosphate-finish screws perform well. For fully exposed exterior applications in wet climates, a zinc or stainless screw may be preferable. What pack size should I order? The 17650 is available in packs of 50, 100, 200, and 300. A pack of 50 is suitable for small repair jobs or mixed-kit builds. Packs of 100 or more are recommended for shops that routinely stock common fasteners. The 200 and 300 packs offer the best per-screw price for high-volume users. Can I use this screw with a power driver? Yes — the #2 Phillips drive is compatible with standard power drill drivers and impact drivers. Use a lower torque setting or clutch setting to avoid stripping the head or over-driving into thin sheet metal. A magnetic bit tip helps with accurate placement in confined areas.
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