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About Tapping Screws
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Steel Phillips Flat Head Screws for Wood
These screws are beveled under the head for use in countersunk holes. They press threads into material for a tight, secure hold. To prevent splitting, drill a pilot hole slightly smaller than the screw. Length is measured from the top of the head.
Zinc-plated steel screws resist corrosion in wet environments.
Head | |||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|
| Lg. | Dia. | Ht. | Drive Size | Softwood Drill Bit Size | Hardwood Drill Bit Size | Approximate Threads per Inch | Threading | Min. Thread Lg. | Pkg. Qty. | Pkg. | |
Zinc-Plated Steel | |||||||||||
No. 20  | |||||||||||
| 2" | 0.65" | 0.196" | No. 4 | 11/64" | 13/64" | 8 | Partially Threaded | 1.333" | 10 | 000000000 | 000000 |
| 3" | 0.65" | 0.196" | No. 4 | 11/64" | 13/64" | 8 | Partially Threaded | 1.98" | 10 | 000000000 | 00000 |
| 4" | 0.65" | 0.196" | No. 4 | 11/64" | 13/64" | 8 | Partially Threaded | 2.667" | 10 | 000000000 | 00000 |
| 5" | 0.65" | 0.196" | No. 4 | 11/64" | 13/64" | 8 | Partially Threaded | 3.333" | 5 | 000000000 | 00000 |