I have a screw that is stuck on a metal plate. What type of filing tool will be suitable to file the screw head so that it change from round to square shape?
What types of filing tool is more suitable for this task
screws
Related Solutions
You're using the wrong type of screws.
It should be a #7 Pan-Head
And Not the self tapping. The self tapping is good for thicker metal studs but the the sharp tip works best for those angle shots you're having trouble with.
Use #8 self tapping for the tougher thicker steel studs
I would say the optimal screw hole shape that will allow the maximum amount of torque to be applied, would be no hole.
Removing material from the head of the screw; no matter what shape, will weaken the screw slightly. The only way to maintain the full strength of the screw; and therefore achieve maximum torque, is to not remove any material. So a hex head screw (not to be confused with a hex drive screw), would allow for maximum torque.
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Best Answer
For a small screw, a warding file with a flat edge. For a larger screw a normal flat metal file with a flat edge.
By flat file I mean one with a rectangular cross section. These usually have cutting teeth on the larger "face" sides. The thinner edges usually have one narrow edge with teeth and one narrow edge that is a smooth "safe" edge without any teeth. You can buy these at any DIY/hardware store.
This assumes the screw is a normal unhardened steel or brass machine screw of modest size.
A fairly common way to remove stubborn, seized, corroded or damaged screws is heat, penetrating oil and a "screw extractor"