How to Stop Stripping Screws
An impact driver has more than enough power to destroy a screw head in half a second. Almost every stripped screw traces back to a handful of fixable causes: bit fit, bit wear, angle, pressure and speed.
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To avoid stripping screws, use a fresh impact-rated bit that fits the recess exactly, keep the tool in line with the screw, push firmly, and use a lower speed for small screws. Ease off the trigger as the head seats and stop at flush. Where you can, choose Torx or square-drive screws, which resist cam-out far better than Phillips.
On this page
Why screws strip: the root causes
| Cause | What happens | Fix |
|---|---|---|
| Wrong bit size or type | Bit rocks in the recess and rounds it | Match size and type exactly |
| Worn bit | Rounded tips slip under load | Replace at the first sign of wear |
| Tool at an angle | Only part of the bit engages | Keep the tool in line with the screw |
| Too little forward pressure | Bit lifts out (cam-out) | Push firmly, especially in reverse |
| Too much speed | Head seats and keeps getting hammered | Lower setting, feather the trigger |
| Poor screw or Phillips drive | Soft recess, designed to cam out | Use Torx or square-drive screws |
| Too much resistance | Screw stalls, bit spins in the head | Pilot hole, lubricate, longer or larger screw |
Bit fit: the number one fix
The bit must fill the recess with no play. Test-fit it by hand before driving: a correct bit seats deep and does not rock.
- Phillips: most common wood and drywall screws take a PH2. Larger screws often take a PH3. A PH2 in a PH3 screw strips instantly.
- Pozidriv and JIS look like Phillips but are not. Pozidriv (marked with extra lines on the head) needs a PZ bit. Japanese equipment often uses JIS screws (a small dot on the head).
- Square (Robertson): #6 screws usually take S1, #8 and #10 take S2, larger screws take S3.
- Torx: sizes vary by maker, so read the box. T20 and T25 cover most construction and deck screws.
A size chart for every common screw is in impact driver bit sizes. If you have a choice of screw, the drive type matters as much as the bit: Phillips vs square vs Torx explains why Torx and square drives strip far less.
Worn and non-impact bits
A bit wears long before it looks broken. On a Phillips bit, look for rounded wing tips. On Torx and square bits, look for rounded corners. If screws start slipping that went in fine yesterday, the bit is the first suspect. Replace it.
Use impact-rated bits. Standard bits are hard and brittle; under impacts their tips chip or twist, and a damaged tip strips the next screw. Impact bits have a torsion zone that flexes to absorb the blows. See impact-rated vs regular bits and impact driver bits for what to buy.
Impact-rated bit sets on Amazon PH2 power bits
Pressure and alignment
- Line up the tool with the screw axis. Look from two directions if you are unsure. Even a few degrees off reduces engagement.
- Push firmly. An impact driver needs less pressure than a drill, but you still need enough to keep the bit fully seated. Lean into it with your body, not just your wrist.
- Use the shortest bit that reaches. Long extensions and holders wobble and magnify angle errors.
- Push even harder in reverse. Removal is where most heads strip, because the screw is tight and you instinctively push less.
Speed settings and modes that stop stripping
Full speed is for long, heavy screws. For anything small, soft or near the end of its travel, go slower. Most current drivers have several speeds and many add modes that help:
- Assist or precision modes start slowly so the screw catches before speed builds. The Makita XDT16 and Ryobi PBLID02 both list an assist mode.
- Self-tapping screw modes, such as on the Milwaukee M18 FUEL 2953 with 4-Mode Drive Control, slow the tool once the screw breaks through metal, which prevents stripping the threads.
- Lowest speed for hinges, hardware, small screws and soft materials.
What each brand's modes do is covered in impact driver speed settings. Whatever the setting, ease off the trigger as the head approaches the surface and release at flush. An impact driver does not stop on its own the way a drill clutch does.
Screw choice and the material
- Buy quality screws. Cheap screws use softer steel and shallow recesses.
- Prefer Torx or square drives for construction, deck and cabinet work.
- Pre-drill hardwoods and near ends. Excess resistance makes the bit spin in the head.
- Lubricate long screws in hardwood with a little wax.
- Use the right screw length and gauge. A screw that is too long for a thin member bottoms out against resistance; one that is too thin twists off.
- Brass and stainless screws strip easily. Drive them by hand or at the lowest setting, after a correctly sized pilot hole.
Stripped threads vs stripped heads
"Stripping" can mean two different failures, and the fixes differ:
Stripped head
The recess is rounded and the bit spins in it. Causes are bit fit, wear, angle, pressure and speed, as above. The screw may still be tight in the material.
Stripped hole
The head is fine but the screw spins in place, because its threads tore out of the wood, particleboard or sheet metal. The cause is overdriving: too much speed and holding the trigger after the head seated. Self-drilling screws in thin metal are especially prone to this once the tip breaks through.
For stripped holes, slow down, release earlier and use a self-tapping mode for metal. In particleboard and soft woods, finish the last turn by hand.
When to use a different tool
An impact driver is not always the right tool. For small screws in soft materials, cabinet hardware, electrical devices and anything where overtightening matters, a drill/driver with its clutch set low, or a screwdriver, slips before the screw strips. For long structural screws, the impact driver is the better tool because its blows keep the bit seated under heavy load. The trade-offs are in impact driver vs drill.
Quick checklist before every drive
- Correct bit type and size? Test-fit by hand.
- Bit in good condition and impact-rated?
- Shortest practical bit or holder?
- Speed set for the screw size and material?
- Pilot hole where needed?
- Tool in line with the screw and firm pressure?
- Ready to release the trigger at flush?
If it is already too late, see how to remove a stripped screw. For basic trigger technique, read how to use an impact driver.
Safety: Wear eye protection. A bit that cams out can skid across the work toward your other hand, so keep that hand clear of the screw's path once the screw has started.
Frequently asked questions
Why does my impact driver keep stripping screws?
Usually a worn or wrong-size bit, the tool held at an angle, not enough forward pressure, or too high a speed. Impact drivers also keep hammering after the screw seats, which chews the head if you do not release the trigger.
Is a drill or an impact driver better for not stripping screws?
A drill with a clutch slips at a set torque, which protects small screws in soft materials. An impact driver is better for long screws because it reduces cam-out under load. Use each where it fits.
Does a magnetic bit holder cause stripping?
Not directly, but a long holder adds wobble, which makes angle errors more likely. Use the shortest holder or power bit that reaches the screw.
Are cheap screws more likely to strip?
Yes. Soft metal and poorly formed recesses strip easily no matter how careful you are. Good-quality screws with Torx or square drives make a noticeable difference.
What is cam-out?
Cam-out is when the bit rides up and out of the screw recess under torque. Phillips recesses do it by design. Repeated cam-out rounds the recess and strips the screw.