About Tapping Screws
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Steel Phillips Drilling Screws for Joining Wood to Metal
These screws 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.
Zinc-plated steel screws resist corrosion in wet environments.
Head | |||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Lg. | Screw Features | Drill Point Size | Drill Tip Lg. | For Metal Thick. | For Wood Thick. | Dia. | Ht. | Drive Size | Thread Size  | Threading | Pkg. Qty. | Pkg. | |
Zinc-Plated Steel | |||||||||||||
1/4" | |||||||||||||
| 3 3/4" | Cutting Wings | No. 4 | 1/2" | 0.11"-0.375" | 0.75"-2.75" | 0.472" | 0.153" | No. 3 | 1/4"-20 | Fully Threaded | 5 | 000000000 | 000000 |
18-8 Stainless Steel Square-Drive Screws
for Softwood and Plastic-Wood Composites
18-8 stainless steel screws have good chemical resistance and are a good choice for ACQ-treated (arsenic-free) lumber. They have a curved neck that sinks into material, so they sit flush with the surface. Also known as deck screws, they have a Type 17 auger point that penetrates softwood and plastic-wood composite decking material. They may be mildly magnetic. Length is measured from the top of the head.
Head | ||||||||||
|---|---|---|---|---|---|---|---|---|---|---|
| Lg. | Dia. | Ht. | Drive Size | Drill Bit Size | Approximate Threads per Inch | Threading | Min. Thread Lg. | Pkg. Qty. | Pkg. | |
18-8 Stainless Steel | ||||||||||
No. 10 | ||||||||||
| 3 3/4" | 0.344" | 0.189" | No. 2 | 3/32" | 8 | Partially Threaded | 2.475" | 25 | 000000000 | 000000 |
Screws for Joining Drywall to Wood
Hang drywall to wood framing. These screws have a sharp point that penetrates drywall and a curved neck that sinks in without tearing the paper surface. Length is measured from the top of the head.
Zinc-plated and zinc yellow-chromate plated steel screws are corrosion resistant in wet environments.
Head | |||||||||
|---|---|---|---|---|---|---|---|---|---|
| Lg. | Dia. | Ht. | Drive Size | Approximate Threads per Inch | Threading | Min. Thread Lg. | Pkg. Qty. | Pkg. | |
Zinc Yellow-Chromate-Plated Steel | |||||||||
No. 10 | |||||||||
| 3 3/4" | 0.363" | 0.039" | No. 2 | 9 | Partially Threaded | 2 1/2" | 25 | 000000000 | 00000 |