When driving screws into interior walls it's important to avoid driving into wires or pipes. Wires and pipes going through studs should normally be going through a 1" diameter hole that is centered on the stud.
Interior drywall are typically 1/2" so a maximum screw length to avoid hitting something would be 1/2" + 1 1/4" = 1 3/4". For a cabinet back that is 3/4" that would mean 1 3/4" + 3/4" = 2 1/2".
| Object Backing | Maximum Screw Length | 1" Into Stud |
| 0 | 1.75 | 1.5 |
| 0.25 | 2 | 1.75 |
| 0.5 | 2.25 | 2 |
| 0.75 | 2.5 | 2.25 |
| 1 | 2.75 | 2.5 |
| | |
| Drywall | 0.5 | |
| Stud | 1.25 |
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