Metallics CSH2F Anchors 3/16X1-3/4 Hwh Blu St-zn (Jar100), 100 Pack

A 3/16 inch diameter screw anchor of this type runs in a 5/32 inch carbide bit hole. Drill the hole deeper than the screw's embedment so dust has somewhere to go, and blow it clear before driving. With a 1-3/4 inch overall length on the CSH2F, allow for the thickness of whatever you are fastening plus enough thread left in the base material to hold.

Hex washer head, so they drive with a 1/4 inch hex driver or socket in an impact driver or drill. No separate plug, shield or anchor sleeve is involved, the screw taps its own thread in the hole.

They are the standard fastener for mounting strut, conduit straps, device boxes, panel backs and enclosures to concrete, block or brick. Metallics lists the CSH2F in its electrical fastener line for exactly that kind of anchoring work.

The CSH2F is zinc plated steel with a blue coating, which suits dry interior and protected work. For sustained exterior exposure, wet locations or treated lumber contact, step up to a stainless or heavier-coated anchor instead, since plated steel will eventually corrode in those conditions.

They back out with the same hex driver, which makes them handy for temporary mounting or repositioning a strap. Reusing the same screw in the same hole gives up holding power though, since the thread it cut is already there. Move over an inch or two and drill fresh for a permanent fix.