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About Tapping Screws
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Steel Square-Drive Flat Head Screws for Wood
Beveled under the head for use in countersunk holes, these steel screws 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.
For technical drawings and 3-D models, click on a part number.
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. 4  | |||||||||||
| 1/2" | 0.225" | 0.067" | No. 0 | 3/64" | 1/16" | 22 | Partially Threaded | 0.33" | 100 | 000000000 | 00000 |
| 3/4" | 0.225" | 0.067" | No. 0 | 3/64" | 1/16" | 22 | Partially Threaded | 1/2" | 100 | 000000000 | 0000 |
| 1" | 0.225" | 0.067" | No. 0 | 3/64" | 1/16" | 22 | Partially Threaded | 0.66" | 100 | 000000000 | 0000 |