(Of a screw) able to cut thread in the material into which it is inserted.
- Over wood framing you can fasten the siding using hand- or air-driven galvanized nails or wood screws, or use self-tapping screws for installation over metal studs.
- Attach rim joists to the outside of the beveled posts with two four-inch, self-tapping screws per joint.
- For lighter gauge sheet metal, there are also self-tapping screws available that don't require pre-drilling.
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