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About Tapping Screws
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Thread-Forming Screws for Joining Wood to Metal
Thread-forming screws press threads into drilled holes for a tight vibration-resistant assembly. All are beveled under the head for use in countersunk holes. A Torx drive allows you to apply extra force with less slippage or damage to the recess. They're black-phosphate steel to resist corrosion in dry environments. Length is measured from the top of the head.
For technical drawings and 3-D models, click on a part number.
Head | ||||||||
|---|---|---|---|---|---|---|---|---|
| Lg. | Dia. | Ht. | Drive Size | Threading | Min. Thread Lg. | Pkg. Qty. | Pkg. | |
Black-Phosphate Steel | ||||||||
1/4"-20 | ||||||||
| 1" | 0.479" | 0.153" | T30 | Fully Threaded | __ | 50 | 000000000 | 000000 |
| 1 1/4" | 0.479" | 0.153" | T30 | Fully Threaded | __ | 50 | 000000000 | 00000 |
| 1 1/2" | 0.479" | 0.153" | T30 | Fully Threaded | __ | 50 | 000000000 | 00000 |
| 1 3/4" | 0.479" | 0.153" | T30 | Fully Threaded | __ | 50 | 000000000 | 00000 |
| 2" | 0.479" | 0.153" | T30 | Fully Threaded | __ | 50 | 000000000 | 00000 |
| 2 1/4" | 0.479" | 0.153" | T30 | Partially Threaded | 2" | 50 | 000000000 | 00000 |
| 2 1/2" | 0.479" | 0.153" | T30 | Partially Threaded | 2" | 25 | 000000000 | 0000 |
| 3" | 0.479" | 0.153" | T30 | Partially Threaded | 2" | 25 | 000000000 | 00000 |
| 3 1/2" | 0.479" | 0.153" | T30 | Partially Threaded | 2" | 10 | 000000000 | 0000 |
| 4" | 0.479" | 0.153" | T30 | Partially Threaded | 2" | 10 | 000000000 | 00000 |
5/16"-18 | ||||||||
| 1 3/4" | 0.6" | 0.191" | T40 | Fully Threaded | __ | 25 | 000000000 | 00000 |
| 2" | 0.6" | 0.191" | T40 | Fully Threaded | __ | 25 | 000000000 | 00000 |
| 2 1/4" | 0.6" | 0.191" | T40 | Partially Threaded | 2" | 10 | 000000000 | 0000 |
| 2 1/2" | 0.6" | 0.191" | T40 | Partially Threaded | 2" | 25 | 000000000 | 00000 |
| 3" | 0.6" | 0.191" | T40 | Partially Threaded | 2" | 10 | 000000000 | 0000 |
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.
Ultra-corrosion-resistant coated steel screws are a good choice for ACQ-treated (arsenic-free) lumber.
For technical drawings and 3-D models, click on a part number.
Head | |||||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Lg. | Screw Features | Drill Point Size | Drill Tip Lg. | For Metal Thick. | For Wood Thick. | Dia. | Ht. | Drive Size | Thread Size | Approximate Threads per Inch | Threading | Min. Thread Lg. | Pkg. Qty. | Pkg. | |
Zinc-Plated Steel | |||||||||||||||
No. 10 | |||||||||||||||
| 3 1/2" | Cutting Wings | No. 4 | 3/8" | 0.11"-0.21" | 0.75"-2.5" | 0.362" | 0.116" | No. 2 | 10-24 | __ | Fully Threaded | __ | 10 | 000000000 | 00000 |
| 4" | Cutting Wings | No. 4 | 3/8" | 0.11"-0.21" | 0.75"-2.75" | 0.362" | 0.116" | No. 2 | 10-24 | __ | Fully Threaded | __ | 5 | 000000000 | 0000 |
No. 12 | |||||||||||||||
| 2" | Cutting Wings | No. 4 | 7/16" | 0.11"-0.25" | 0.5"-1.25" | 0.412" | 0.132" | No. 3 | 12-24 | __ | Fully Threaded | __ | 10 | 000000000 | 0000 |
| 2 1/2" | Cutting Wings | No. 4 | 7/16" | 0.11"-0.25" | 0.5"-1.5" | 0.412" | 0.132" | No. 3 | 12-24 | __ | Fully Threaded | __ | 10 | 000000000 | 0000 |
| 3 1/2" | Cutting Wings | No. 4 | 7/16" | 0.11"-0.25" | 0.75"-2.5" | 0.412" | 0.132" | No. 3 | 12-24 | __ | Fully Threaded | __ | 5 | 000000000 | 0000 |
| 4" | Cutting Wings | No. 4 | 7/16" | 0.11"-0.25" | 0.75"-2.625" | 0.412" | 0.132" | No. 3 | 12-24 | __ | Fully Threaded | __ | 5 | 000000000 | 0000 |
1/4" | |||||||||||||||
| 2 3/4" | Cutting Wings | No. 4 | 1/2" | 0.11"-0.375" | 0.75"-1.75" | 0.472" | 0.153" | No. 3 | 1/4"-20 | __ | Fully Threaded | __ | 10 | 000000000 | 0000 |
| 3 1/4" | Cutting Wings | No. 4 | 1/2" | 0.11"-0.375" | 0.75"-2.25" | 0.472" | 0.153" | No. 3 | 1/4"-20 | __ | Fully Threaded | __ | 5 | 000000000 | 0000 |
| 3 1/2" | Cutting Wings | No. 4 | 1/2" | 0.11"-0.375" | 0.75"-2.5" | 0.472" | 0.153" | No. 3 | 1/4"-20 | __ | Fully Threaded | __ | 5 | 000000000 | 0000 |
| 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 | 0000 |
Ultra-Corrosion-Resistant Coated Steel | |||||||||||||||
No. 10 | |||||||||||||||
| 3/4" | __ | No. 3 | 1/4" | 0.04"-0.17" | 0.25"-0.375" | 0.48" | 0.144" | No. 2 | 10-24 | __ | Fully Threaded | __ | 100 | 000000000 | 0000 |
| 1" | __ | No. 3 | 1/4" | 0.04"-0.17" | 0.25"-0.5" | 0.48" | 0.144" | No. 2 | 10-24 | __ | Fully Threaded | __ | 100 | 000000000 | 0000 |
| 1 1/4" | __ | No. 3 | 1/4" | 0.04"-0.17" | 0.25"-0.75" | 0.48" | 0.144" | No. 2 | 10-24 | __ | Fully Threaded | __ | 100 | 000000000 | 0000 |
| 1 7/16" | Cutting Wings | No. 3 | 1/4" | 0.06"-0.17" | 0.25"-0.75" | 0.41" | 0.17" | No. 2 | 10-24 | __ | Fully Threaded | __ | 50 | 000000000 | 00000 |
| 1 1/2" | __ | No. 3 | 1/4" | 0.04"-0.18" | 0.25"-0.75" | 0.48" | 0.144" | No. 2 | __ | 16 | Fully Threaded | __ | 100 | 000000000 | 00000 |
| 1 13/16" | __ | No. 3 | 13/16" | 0.04"-0.15" | 0.25"-0.75" | 0.47" | 0.135" | No. 2 | __ | 16 | Fully Threaded | __ | 50 | 000000000 | 0000 |
No. 11 | |||||||||||||||
| 3 7/16" | Cutting Wings | No. 4 | 5/16" | 0.06"-0.31" | 1.5"-2.5" | 0.565" | 0.145" | No. 3 | __ | 16 | Partially Threaded | 1.875" | 10 | 000000000 | 00000 |
No. 12 | |||||||||||||||
| 1 5/8" | Cutting Wings | No. 4 | 7/16" | 0.13"-0.25" | 0.75"-1.125" | 0.476" | 0.25" | No. 3 | 12-24 | __ | Fully Threaded | __ | 50 | 000000000 | 00000 |
| 1 3/4" | Cutting Wings | No. 4 | 3/4" | 0.06"-0.31" | 0.5"-0.75" | 0.54" | 0.165" | No. 3 | 12-24 | __ | Fully Threaded | __ | 50 | 000000000 | 0000 |
| 2 1/4" | Cutting Wings | No. 4 | 1/2" | 0.13"-0.25" | 0.75"-1.375" | 0.438" | 0.16" | No. 3 | 12-24 | __ | Fully Threaded | __ | 10 | 000000000 | 0000 |
| 2 3/4" | Cutting Wings | No. 4 | 1/2" | 0.13"-0.25" | 0.75"-1.625" | 0.438" | 0.16" | No. 3 | 12-24 | __ | Fully Threaded | __ | 10 | 000000000 | 0000 |
| 3 5/8" | __ | No. 2 | 1 3/4" | 0.04"-0.15" | 0.75"-1.625" | 0.415" | 0.16" | No. 3 | __ | 14 | Fully Threaded | __ | 25 | 000000000 | 0000 |
1/4" | |||||||||||||||
| 3" | Cutting Wings | No. 4 | 1/2" | 0.13"-0.25" | 0.75"-2" | 0.507" | 0.175" | No. 3 | 1/4"-20 | __ | Fully Threaded | __ | 25 | 000000000 | 0000 |
| 4" | Cutting Wings | No. 4 | 7/8" | 0.06"-0.31" | 0.75"-2.875" | 0.485" | 0.185" | No. 3 | 1/4"-20 | __ | Partially Threaded | 2.188" | 10 | 000000000 | 0000 |
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. | |
Zinc-Aluminum Coated 18-8 Stainless Steel | |||||||||||||
No. 10 | |||||||||||||
| 1 1/2" | Cutting Wings | No. 3 | 1/4" | 0.385" | 0.116" | No. 2 | __ | 16 | Fully Threaded | __ | 10 | 000000000 | 00000 |
No. 12 | |||||||||||||
| 1" | __ | No. 2 | 19/64" | 0.438" | 0.078" | No. 3 | __ | 14 | Fully Threaded | __ | 10 | 000000000 | 0000 |
| 1 1/2" | __ | No. 2 | 19/64" | 0.438" | 0.078" | No. 3 | __ | 14 | Fully Threaded | __ | 10 | 000000000 | 0000 |
| 2 13/16" | Cutting Wings | No. 5 | 45/64" | 0.438" | 0.132" | No. 3 | __ | 14 | Partially Threaded | 1.5" | 5 | 000000000 | 0000 |
1/4" | |||||||||||||
| 2 13/16" | Cutting Wings | No. 5 | 45/64" | 0.507" | 0.153" | No. 3 | 1/4"-20 | __ | Partially Threaded | 1.5" | 5 | 000000000 | 0000 |
| 3" | __ | No. 3 | 5/16" | 0.507" | 0.153" | No. 3 | 1/4"-20 | __ | Partially Threaded | 1.5" | 5 | 000000000 | 0000 |
| 4" | __ | No. 3 | 5/16" | 0.507" | 0.153" | No. 3 | 1/4"-20 | __ | Partially Threaded | 1.5" | 5 | 000000000 | 00000 |
Torx Drilling Screws for Joining Wood to Metal
A Torx drive has more points of contact than a Phillips drive, allowing you to apply extra force with less slippage or damage to the recess. These screws speed installation by drilling, tapping, and fastening wood and metal in a single operation. Made from zinc-plated steel, they resist corrosion in wet environments. Length is measured from the top of the head.
For technical drawings and 3-D models, click on a part number.