The complaint usually arrives in this order. The screw stripped. The board split. The head snapped off. And then the tool gets blamed, or the technique does. Most of the time, the fastener was wrong before anybody pulled a trigger.
Drive type decides cam-out
Cam-out is when the bit climbs out of the head under torque. Phillips heads were designed to do that, back when clutches were rare and cam-out protected the work from over-driving. Modern drivers have clutches. The cam-out is now just damage.
Ranked by how well they hold a bit under load:
- Star (Torx) drive. Straight-walled lobes, almost no cam-out, excellent under high torque. Standard on most structural and premium deck screws.
- Square (Robertson) drive. Very good, holds the screw on the bit for one-handed work, common in cabinet and pocket-hole screws.
- Combination square/Phillips. Fine if you use the square bit.
- Phillips. Adequate for light-duty work with a fresh bit and firm pressure. Frustrating for anything else.
Bit condition matters as much as head type. A rounded bit destroys heads and costs less to replace than the time spent extracting a stripped screw.
Threads do the holding
Coarse threads have deeper, wider-spaced flights that bite soft material. They are the right answer in softwood framing, plywood, and composite.
Fine threads cut cleanly in dense material and hold better in hardwood or metal, where a coarse thread tends to tear the fibers or bind.
Two details matter beyond pitch. A partially threaded screw with a smooth shank under the head pulls two boards tight, because the top board is not gripped by threads. A fully threaded screw does not draw pieces together; it holds them where they already sit. Using a fully threaded screw to close a gap is why some joints never tighten no matter how hard the tool works.
The second detail is the point. Type 17 points, the ones with a small notch at the tip, cut a channel as they go and dramatically reduce splitting in softwood.
Length, honestly
The working guideline: the screw should end up with roughly two thirds of its length in the receiving piece. Fastening three-quarter-inch stock means a screw around two inches. Too short and it pulls out. Too long and it either breaks through the back or, in a thin part, splits it.
Anything structural is different. Structural connections need fasteners rated for the load, installed as the manufacturer specifies, and a deck ledger or a beam connection is not the place to improvise. When a connection carries weight or holds people up, follow the published schedule for that connector or consult someone who can size it.
Pilot holes, and where they earn their time
A pilot hole removes the material the screw would otherwise have to displace. Drilling one takes about four seconds. Fixing a split board takes considerably longer.
Drill a pilot when:
- The fastener is within about two inches of the end of a board.
- The material is hardwood, dense composite, or old dry lumber.
- The screw is large in diameter relative to the piece.
- The part is expensive, visible, or already installed.
Pilot diameter should roughly match the screw's solid core, not the outer thread diameter. In hardwood, countersinking the top piece as well keeps the head from wedging and splitting.
Then adjust the tool
Once the fastener is right, the tool settings matter. Start the clutch low and work up until it drives flush without slipping. Run the drill on the low speed range for driving, since low speed is high torque and it gives more time to react. On an impact driver, ease off the trigger as the head approaches the surface; impacts have no clutch and will happily sink a screw right through drywall paper or a cabinet face.
The short version
Right head, right thread, right length, pilot where it counts. Do that and the cheap driver works fine. Skip it and the expensive one still strips screws.