About Tapping Screws
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Stainless Steel Phillips Drilling Screws for Joining Wood to Metal
18-8 stainless steel screws have good chemical resistance and are a good choice for ACQ-treated (arsenic-free) lumber. They speed installation by drilling, tapping, and fastening wood and metal in a single operation. Length is measured from the top of the head.
Screws with cutting wings drill a slightly larger hole in the wood to allow for expansion. The wings break off when they contact metal, so the screw can tap the remainder of the hole.
For technical drawings and 3-D models, click on a part number.
Head | |||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Lg. | Screw Features | Drill Point Size | Drill Tip Lg. | Dia. | Ht. | Drive Size | Thread Size  | Approximate Threads per Inch | Threading | Min. Thread Lg. | Pkg. Qty. | Pkg. | |
Galvanic Barrier Coated 18-8 Stainless Steel | |||||||||||||
No. 12 | |||||||||||||
| 2 13/16" | Cutting Wings | No. 5 | 45/64" | 0.415" | 0.2" | No. 3 | __ | 14 | Partially Threaded | 1 1/2" | 5 | 000000000 | 00000 |
1/4" | |||||||||||||
| 2 13/16" | Cutting Wings | No. 5 | 45/64" | 0.48" | 0.2" | No. 3 | 1/4"-20 | __ | Partially Threaded | 1 1/2" | 5 | 000000000 | 00000 |