Screws strip when the driver tip does not fit the head well or when it slips out under load. To avoid it, match the tip exactly, push in firmly as you turn, and go slowly. A little care at the beginning saves a lot of frustration later.
Why Screws Strip
A stripped head has worn grooves, so the driver can no longer grip. The usual causes are the wrong size or shape of driver, too little downward pressure, a worn tip, or driving a screw into hard material with no pilot hole.
- A tip that is a little small will rattle and chew the head.
- A worn or rounded tip cannot bite.
- Angled driving pushes the tip out of the slot.
- Power tools running too fast can wear the head in seconds.
Step-by-Step
- Look closely at the head and identify the type, such as slotted, cross, square, or six-lobe drive. Check the screw packaging if you are unsure.
- Choose a driver tip that fills the recess fully, with no wiggle.
- Clean out any dirt or old finish from the recess so the tip seats all the way.
- Drill a pilot hole for hard material or near edges.
- Align the driver in a straight line with the screw.
- Push firmly into the head while you turn, with more push than turn.
- Go slowly, especially in the final turns. With a drill driver, set a low speed and a clutch setting that is appropriate, as the manual describes.
- Stop when the screw is snug. Over-tightening can strip the hole or snap the screw.
Match the Driver to the Screw
| Head type | Driver needed | Tip |
|---|---|---|
| Slotted | Flat tip matching slot width | Tip should fill the slot |
| Cross-head | Matching cross type and size | Different cross types are not interchangeable |
| Square drive | Square tip of the right size | Grips well under load |
| Hex or six-lobe | Matching bit | Check size carefully |
If a Head Is Already Damaged
- Try a slightly larger or different tip that bites deeper.
- Place a wide rubber band or a piece of cloth between the tip and the head for extra grip.
- Use a screw extractor made for damaged heads, following its instructions.
- Wear eye protection, since broken bits can fly.
Replace worn driver bits, since a worn tip will keep damaging heads.
Cross-Head Types That Look Alike
Many stripped screws are the result of using a driver that looks right but is not. Several cross-head designs share a similar appearance, yet their tips are shaped differently. One common design has pointed wings and a sharp profile, while another has a more tapered tip with extra small ribs in the recess. Using the wrong one lets the tip sit high in the recess, so it grips only at the top edges, and those edges quickly wear out.
A good test is to seat the tip in the screw and check how it feels. It should drop fully in, sit snug and not rock when you wiggle it. If you can see a gap or if the driver tilts, try a different type or size. Packaging and product pages often name the drive style, so use that information when buying both screws and drivers.
Size matters within each type. Drivers are made in numbered sizes, and a size that is a notch too small is a leading cause of cam-out, which is the tip riding up and out of the recess under torque.
- Match both the shape and the size, not just one of them.
- Keep a few common sizes in each type so you do not improvise.
- Where screws come in a kit, use the bit supplied or specified.
When in doubt, take a screw with you and test drivers against it.
Choosing Quality Bits and Drivers
Even the right size will strip a screw if the tip is poorly made or worn. Look for tips with crisp, clean edges and a consistent shape. A tip with rounded corners, a rough finish or visible damage will not bite. The steel and heat treatment of a bit affect how long its edges survive, so read the product description for what the maker states, and avoid assuming that a higher price means a better bit.
Consider the format. Hand drivers with comfortable handles give good control and feedback, which helps beginners feel when a screw is seating. Bits used in a drill driver come in different lengths. Short bits stay more stable under torque, while longer ones reach into recesses but can wobble. A magnetic holder can keep a screw on the tip, which helps with alignment.
Impact-rated bits are made for impact drivers, which deliver sudden bursts of force. Using standard bits in an impact driver may damage them, so follow the maker’s guide on which bits suit which tools.
- Inspect new bits for a clean, even shape.
- Replace bits when the corners round off or the tip looks shiny and worn.
- Keep bits in a case so the tips do not knock together.
Power Driver Settings and Technique
Power tools make stripping faster, so settings and technique matter. Begin with the clutch, which is the numbered ring behind the chuck. Lower numbers slip at lower torque and higher numbers allow more force. Start low, drive a test screw into scrap of the same material, and raise the setting until the screw seats flush without the clutch giving up too early. The right number varies with the screw, the material and the tool, so your manual is the reference.
Use low speed for starting the screw and for the final turns. Speed helps in the middle of the drive but encourages slipping at the start and over-driving at the end. Keep the driver in line with the screw and lean into it. Pressing firmly while the trigger is only partly squeezed gives better control than full speed with light pressure.
Impact drivers are strong and suit long or large screws, but they can snap small ones or strip soft materials quickly. Use them with care, and for delicate work consider a drill driver or a hand driver.
- Stop when the head is flush, not when the motor strains.
- Back the screw out a quarter turn and re-seat it if it starts to skip.
- Let the tool do the work rather than forcing it.
Pilot Holes, Lubrication and Material Considerations
The material you are driving into affects how hard the screw works. In dense hardwoods and near board ends, the screw meets heavy resistance, and the driver tip takes the strain. A pilot hole sized to the screw core reduces this load. A clearance hole in the top piece, wider than the shank, lets the screw pull two parts together instead of fighting through both. Check the screw packaging or a sizing chart for suggested drill sizes, since they vary.
Some people rub a little wax or soap on the threads of screws driven into hardwood to reduce friction. If you do, keep the quantity small and consider whether it could affect any finish or glue nearby. In metal, use screws made for that material and consider a lubricant recommended for the task.
Corrosion and age also play a role. Old screws that have sat in damp conditions may seize, and forcing them is the quickest way to ruin the head. Spray a suitable penetrating product as directed on its label, give it time to work, and then try again with a well-fitting driver and steady pressure.
- Match the screw type to the material, such as wood screws for wood.
- Avoid driving screws too close to edges.
- Do not reuse badly damaged screws.
Removing Stuck or Damaged Screws Safely
When a screw refuses to turn, stop and think before applying more force. Clean the recess so the tip can seat. Choose the best-fitting driver, press hard into the head and turn slowly. A short, firm tap on the driver handle with a hammer, where appropriate for the tool, can help seat the tip and break the bond of a stuck thread, but do not use this on tools that are not made to be struck.
If the head is damaged, options include a slightly larger bit that cuts a new purchase, a screw extractor set that bites into the damaged head, or a rubber band for added friction. For screws whose heads have broken off, you may need to drill carefully or use specialist tools, and sometimes it is wiser to leave the remainder in place if removing it risks damaging the work.
Take care with fragments. Hardened bits and screws can chip, so wear eye protection. Support the work so that it cannot slip while you press hard.
- Work gradually, increasing effort only when the tip is seated.
- Apply heat only if the manual and the materials allow, and keep fire safety in mind.
- Replace the screw with a new one rather than reusing a damaged one.
FAQ
Is it better to use a hand driver or a power driver?
Both work. A hand driver gives more feel, and a power driver is faster but easier to overdo. Use the clutch and a low speed on power tools.
Why do screws strip more in hardwood?
Dense wood resists the screw, so the driver works harder. A pilot hole reduces the force needed.
What is cam-out?
It is when the driver tip rides up and out of the screw recess under load. It is usually caused by a poor fit, too little downward pressure or a worn tip, and it rounds off the recess edges.
Does a magnetic bit holder help?
It can keep the screw aligned with the driver and free up a hand, which makes starting screws easier. It does not replace a good tip fit or steady pressure.
How do I know which clutch setting to use?
Begin with a low setting, test on scrap of the same material and raise it until the screw seats flush. Your manual explains what the numbers mean for your tool.
Can I use the same bit for different screws that look similar?
Not always. Similar-looking drives can differ in shape and size. Test the fit and choose the bit named for the screw type.
Why does a screw snap instead of stripping?
Excess torque, hard material without a pilot hole or low-quality or corroded screws can all cause snapping. Pre-drill, use a lower torque setting and choose screws suited to the job.
Is lubricating screws a good idea?
A small amount of suitable lubricant can ease driving into dense wood, but consider the effect on finishes and glues first. Check the product label for its intended use.
When should I replace my driver bits?
When the tip looks rounded, shiny or chipped, or when they start to slip on screws they used to grip. Worn bits damage screws even when used carefully.
The Short Version
Match the tip to the head, keep the driver straight, push firmly, and turn slowly. Pre-drill in hard material, stop when snug, and replace worn bits. Follow the manuals for your tools and fasteners.