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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 | Drill Bit Size | Threading | Min. Thread Lg. | Pkg. Qty. | Pkg. | |
Black-Phosphate Steel | |||||||||
1/4"-20  | |||||||||
| 1" | 0.479" | 0.153" | T30 | No. 3 | Fully Threaded | __ | 50 | 000000000 | 000000 |
| 1 1/4" | 0.479" | 0.153" | T30 | No. 3 | Fully Threaded | __ | 50 | 000000000 | 00000 |
| 1 1/2" | 0.479" | 0.153" | T30 | No. 3 | Fully Threaded | __ | 50 | 000000000 | 00000 |
| 1 3/4" | 0.479" | 0.153" | T30 | No. 3 | Fully Threaded | __ | 50 | 000000000 | 00000 |
| 2" | 0.479" | 0.153" | T30 | No. 3 | Fully Threaded | __ | 50 | 000000000 | 00000 |
| 2 1/4" | 0.479" | 0.153" | T30 | No. 3 | Partially Threaded | 1 1/2" | 50 | 000000000 | 00000 |
| 2 1/2" | 0.479" | 0.153" | T30 | No. 3 | Partially Threaded | 1 1/2" | 25 | 000000000 | 00000 |
| 3" | 0.479" | 0.153" | T30 | No. 3 | Partially Threaded | 1 1/2" | 25 | 000000000 | 00000 |
| 3 1/2" | 0.479" | 0.153" | T30 | No. 3 | Partially Threaded | 1 1/2" | 10 | 000000000 | 00000 |
| 4" | 0.479" | 0.153" | T30 | No. 3 | Partially Threaded | 1 1/2" | 10 | 000000000 | 00000 |