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I need to replace some old door hinges and the current hinges only have 2 of the 4 holes drilled. I am installing 4x4 self closing hinges and want to have all the screws installed. Problem is I did a dry run on a different door and the machined screws don’t pull the hinge to the door tightly, they get to a certain point and just spin. Obviously I don’t know what I’m doing. I’d like to know what equipment I need, what size screws, what size bits, the works. The door is a residential door, most likely hollow with insulation on the inside.

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    Is this a hollow steel door (commercial style) or a steel-wrapped wooden door? Commercial-style doors have heavy plates welded into the structure at the hinge points and will be tapped for machine-thread screws. You can't expect sheet-metal screws in light metal to carry that dynamic load for any length of time. Please revise your post to add detail about the door. – isherwood Sep 30 at 14:10
  • Updated to mention it is a residential metal wrapped door. – Alessandro Sep 30 at 16:49
  • What are "machined screws"? Do you mean machine-thread screws? Obviously those wouldn't be ideal in wood. Use wood screws of around #12. – isherwood Sep 30 at 17:19

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