How to Drive Deck Screws Without Stripping Them

It starts the same way every time. You're two boards into a deck repair, the drill is humming, and then the bit spins free with that sick grinding sound. You pull the screw out and look at the head. It's chewed into a smooth circle. Now you get to dig it out with pliers, drill it out, or leave it and hope the board doesn't warp. I've done all three on the deck behind my house in Spokane, and none of them is fun.

The fix isn't a stronger arm or a more expensive drill. It's the bit. A good bit grabs the screw head and doesn't let go. That's what finally got me to buy the DEWALT FlexTorq 40-piece impact driver bit set. I'll be honest, I was skeptical of a set that big. But after a summer of deck boards, garage shelving and a bathroom refresh, I have opinions, and most of them are good.

Why Screws Strip in the First Place

Stripping happens when the bit loses contact with the screw head. Sometimes the bit is too small. Sometimes it's worn. Sometimes you're driving at an angle, pushing too hard, or using a drill that just doesn't have the torque for the job. The screw head gives, the bit skips, and the metal in the head softens. Once that happens, no amount of extra pressure fixes it. You either back the screw out or you drill it out.

The DEWALT FlexTorq set solves the part you can control. The bits have a torsion zone that lets them flex a little instead of snapping or slipping. I won't pretend I understand the metallurgy perfectly. What I understand is the result: fewer skipped drives, fewer rounded heads, and fewer times I have to apologize to a piece of hardware.

How I Used This Set

I used this set on three projects this year. The deck was the big one. I replaced a dozen boards, drove somewhere around 150 screws, and stripped exactly one. That one was my fault, because I was reaching over the edge of the deck at a bad angle and the bit came out of the screw head before I pulled the trigger. The other 149 went in clean.

After the deck, I built a set of garage shelves on the folding workbench in my workshop. Same bits. Then I refreshed the bathroom trim, same bits again. I haven't touched the drill's original bit since I got this set.

The case is half the reason I actually use it. It's a hard plastic case with labeled slots. I can find the Phillips #2 without looking, which matters when you're on a ladder with one hand holding a board and the other hand holding a screw. Everything has a home, and it closes up small enough to hang on the pegboard wall.

What I Like About the FlexTorq Bits

The first thing I noticed was how snug the bits sit in the screw head. My old bits had play in them, so the driver would wobble before the screw even started. These bits feel locked in. That snug fit is what keeps the screw from rounding out when you're driving into pressure-treated lumber, which is harder than it looks.

I also like that the set includes a mix of common sizes and a few odd ones. There are two of the bits I use most, which is handy when I wear one down in the middle of a project. And the case has a clear lid, so I can see what's inside without opening it. Little things, but they add up when you're tired at the end of a long day.

Step 1: Pick the Right Bit for the Screw

Most deck screws are Phillips #2. Some are square drive, and some are Torx. Before you drive a single screw, match the bit to the head. The DEWALT set includes Phillips, slotted, square and Torx bits, so you don't have to go hunting for the right one. It also has a few specialty bits that cover the odd screws you find in older houses.

The bit should sit snug in the screw head. If it wobbles, that's a sign you have the wrong size or a worn bit. Push the bit in and see if it holds. A good fit is the difference between a screw that goes in and a screw that turns into a problem you have to fix at the end of the day.

Step 2: Use an Impact Driver If You Have One

An impact driver delivers quick bursts of rotational force instead of constant twisting. That hammering action helps the bit bite into the screw head and keeps it from slipping. You can drive screws with a regular drill, and this bit set works fine in a drill too. But if you're doing a whole deck, an impact driver makes the job easier on your wrist and on the screw.

Start on a low speed if your driver has settings. You can always speed up. Starting slow lets you feel how the screw is seating. When it starts to resist, let the impact driver do its job instead of leaning on it with your body weight. The tool is smarter than my shoulder, and I've learned to let it work.

Step 3: Seat the Bit Square Before You Pull the Trigger

This sounds obvious, but it's the step most people skip. Put the bit into the screw head straight, not at an angle. Angle is what strips screws. Line up the bit with the screw, hold the driver level, and only then squeeze the trigger. I say this from experience. My stripped screw happened because I was twisted sideways and the bit was riding the edge of the head.

The FlexTorq bits have a little give, which helps when you're slightly off. But don't rely on that. I keep a spare bit in my apron pocket so I can switch when one wears down. Worn bits strip screws faster than new ones, and the DEWALT set has enough bits that you can afford to retire one and grab another. That's the real advantage of a 40-piece set.

Step 4: Let the Tool Do the Work

When a screw gets hard to turn, resist the urge to push harder. Pushing harder makes the bit skip. Instead, back off a quarter turn, seat the bit again, and let the impact driver pulse the screw in. The pulses do the work. Your job is just to keep the bit straight and apply light, steady pressure. Think of it as guiding the screw rather than forcing it.

If the screw starts to strip anyway, stop immediately. Back the screw out, swap in a fresh bit, and try again. Sometimes a different bit shape grips a damaged head better. That's why I like having the full set nearby. A screw that strips partway is annoying. A screw that strips all the way is a project.

Step 5: Keep Your Bits in the Case and Replace Worn Ones

Bits wear out. A Phillips #2 that has driven five hundred screws will not grip like a new one. The DEWALT case makes it easy to see which ones are getting dull, because the slots are labeled and the bits stand upright. When one looks shiny and rounded at the tip, retire it and use a fresh one. The whole point of having forty bits is that you don't have to baby the one you're using.

I also clean my bits now and then. A little grease or sawdust on the tip can make it slip. Wipe it on your shirt or a rag before you start a run of screws. It takes two seconds and saves you a stripped screw. And when you're done, put the bits back in the case. Future Peggy appreciates it.

Common Mistakes That Strip Screws

The biggest mistake is using the wrong bit. I see people drive deck screws with the bit from their drill's original kit, and that bit is usually a cheap, soft Phillips that doesn't fit tight. It works for one or two screws, then it starts to round out the heads. The DEWALT set gives you a fresh, sharp bit for every job, and that alone cuts down on stripping.

The second mistake is driving too fast. When you pull the trigger all the way, the bit spins fast, skips, and chews the head. Slow down. You're not in a race. The third mistake is not using enough downward pressure. You want firm, steady pressure along the axis of the screw, not a heavy push from the side. It's a balance, and it gets easier with practice.

The fourth mistake is ignoring the screw itself. If the screw has a rusty head or a deformed head, no bit will save it. Use good screws. I've learned that buying a box of decent coated deck screws is cheaper than buying a box of cheap ones twice, and it saves your back too.

What Else Helps

A few things make driving screws easier besides the bit set. A countersink bit helps you set screw heads flush with the deck surface. A magnetic bit holder keeps the screw on the bit so you can start it one-handed. And good screws matter more than people think. Cheap screws have softer heads that strip no matter what bit you use. I buy coated deck screws, and the ones from my deck project have held up fine through two winters.

One more tip: if a screw starts to strip, stop and switch to a bit with a different shape. Sometimes a square drive bit will catch a Phillips head that has started to round out. It won't always work, but it's worth trying before you reach for the drill-out kit.

I drove 150 deck screws this summer and stripped exactly one, and that one was my fault.

Who Should Buy This Set

If you own a drill and you do more than hang pictures, this set is worth having. It covers Phillips, slotted, square and Torx, so it handles just about any screw you'll meet around a house. The case keeps it organized. And because it's DEWALT, you're not buying it twice. I've had mine for a year and it still looks like new.

If you only drive a screw once a year to fix a drawer pull, you can get away with the one bit that came with your drill. But if you've got a deck, a fence, a shed, or a grandkid who wants a birdhouse, you'll use this set more than you expect. I keep mine in the garage workshop on the pegboard wall, and I reach for it constantly.

The Bottom Line

Stripped screws are almost never the screw's fault. They're a sign that the bit, the speed, or the angle is wrong. A good bit set doesn't make you a better carpenter, but it removes one more excuse between you and a finished project. The DEWALT FlexTorq 40-piece set does that better than anything I've tried. I'm not someone who owns every tool in the catalog. I buy what earns its place on my pegboard. This set earned it.