>>4164622That screw isn't sheared. Sheared means it's broken & the head has come off leaving the threaded bit behind.
With that out of the way...
1- Impact driver. It's a beefy handheld tool you hit with a hammer, it applies downward force and rotational torque as you strike it. Ask a local mechanic or buy one. If you can clamp the workpiece securely you might be able to replicate the effect by holding a screwdriver (pushing down HARD and holding turning pressure) and hitting it with a hammer.
2- Heat. Get a smol blowtorch (even a windproof lighter would do) and heat the metal around the screw. Heat expands stuff and will loosen the thread's grip. If the thing the screw is stuck in is aluminium or a copper alloy (brass, bronze) you'll need to apply lots of heat due to the thermal conductivity. Applying heat will also soften any loctite or other threadlocking compounds/glue that may have been the reason you rounded it in the first place.
3- Desperation mode = Drill. Absolute last resort as you WILL ruin the threads doing this unless you're an expert machinist with a very accurate mill. I strongly recommend NOT drilling out a screw that small unless the part is junk anyway and you're stripping it apart to get to some other part... If that's the case then just chisel the cunt apart.
Lesson learned here; Use the right tool for the job and this won't happen. Phillips head & pozidrive look the same but have different profiles. Screwdrivers come in different sizes for a reason.
Also, if a screw isn't coming out... STOP. Don't just keep gorillafucking it until you ruin it, stop and think. Is it left hand thread, is it loctited, is is seized from corrosion? There's a reason it won't budge, figure that out and take appropriate action. Loctite needs heat. Seized needs wd40 or some other penetrating lube applied and left for a while, overnight ideally. Badly seized needs heat also.
t.mechanic
