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Get through metal roofing, steel studs, and sheet metal faster with this 400‑piece hex washer head self-drilling screw assortment. Each screw has a hardened drill‑bit tip that bores its own pilot hole, eliminates the need for a separate bit, and taps tight threads as it drives — true one‑step fastening. The hex washer head delivers a wide, load‑spreading bearing surface and lets you apply high torque with a standard socket or nut driver, so cam‑out is virtually nonexistent. Made from 410 stainless steel, these screws offer higher strength and hardness than 304, along with good atmospheric corrosion resistance — magnetic, durable, and built for HVAC ductwork, steel framing, auto panels, and outdoor wood construction. The kit covers three Imperial diameters (#8, #10, #12) and six popular lengths from 1/2″ to 2″, giving you the right fastener within arm’s reach for both quick repairs and large builds.
| Size | Diameter (Approx.) | Available Lengths | Head Style | Drive | Material | Qty in Kit |
|---|---|---|---|---|---|---|
| #8 | ~4.2 mm | 1/2″, 5/8″, 3/4″, 1″, 1-1/2″ | Hex Washer Head | External Hex (5/16″ or 3/8″) | 410 Stainless Steel | — |
| #10 | ~4.8 mm | 1/2″, 5/8″, 3/4″, 1″, 1-1/2″ | Hex Washer Head | External Hex (5/16″ or 3/8″) | 410 Stainless Steel | — |
| #12 | ~5.5 mm | 3/4″, 1″, 1-1/2″, 2″ | Hex Washer Head | External Hex (5/16″ or 3/8″) | 410 Stainless Steel | — |
This 400‑piece kit includes: #8x1-1/2″ (80), #8x3/4″ (80), #8x1″ (60), #10-1/2″ (60), #10x3/4″ (40), #10x1″ (30), #12x3/4″ (25), #12x1-1/2″ (15), #12x2″ (10). Quantity per size listed reflects pack contents.
That's correct. The drill‑shaped tip will punch through sheet metal up to about 2 mm thick and into wood without pre‑drilling. For thicker steel or very hard materials, a small pilot hole can reduce drive torque, but in most common applications, these are true one‑step fasteners.
410 stainless is harder and stronger than 304, offering good atmospheric corrosion resistance. It's magnetic and ideal for indoor and mild outdoor use. For constant saltwater exposure, 316 would be preferable, but for roofing, HVAC, and general construction, 410 holds up exceptionally well at a lower cost.
Most #8 and #10 Tek screws use a 5/16″ (8 mm) hex socket, while #12 may use 5/16″ or 3/8″, depending on the exact head. A magnetic nut driver bit in 5/16″ and 3/8″ will cover the entire kit.
Absolutely. The self‑drilling tip bites through the metal layer and threads tightly into the wood substrate beneath. They're widely used for fastening metal roofing to timber purlins, attaching brackets to wood studs, and similar mixed‑material assemblies.
Yes, 410 stainless is magnetic, unlike 304 or 316. This can help retrieve dropped screws with a magnet, but they may not be suitable for extremely sensitive electronic applications where magnetism must be completely avoided.
