How and When to Use a Lagscrew

All screws have one thing in common: a helical thread, or groove, that winds its way around a metal shaft. The largest wood screws are called lagscrews, and you'll find them in your local hardware store in sizes ranging from 1/4 in. in diameter to 1/2 in. Lagscrews have hexagonal (or hex) heads so they can be driven with a wrench. Nothing dainty about these fasteners. they're particularly good for building decks, docks, fences and heavy-duty racks. And, these days, attaching HDTVs to wall studs.

Expert Tip

Got lots of lags to drive? The tool of choice to sock 'em down quickly is the cordless impact driver.

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