About Tapping Screws
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Torx Flat Head Thread-Cutting Screws for 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 are beveled under the head for use in countersunk holes. They cut threads in drilled holes as they’re turned, so they require less driving torque and cause less stress on your material than thread forming screws. Length is measured from the top of the head.
Screws with a black-phosphate finish provide mild corrosion resistance in dry environments.
Screws with a zinc-plated finish resist corrosion in wet environments.
For technical drawings and 3-D models, click on a part number.
Head | |||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|
| Lg. | Dia. | Ht. | Drive Size | Drill Bit Size | Threading | Minimum Thread Lg. | Tapping Screw Type | For Use In | Pkg. Qty. | Pkg. | |
Black-Phosphate Steel | |||||||||||
10-24  | |||||||||||
| 1 1/4" | 0.362" | 0.116" | T20 | No. 17 | Fully Threaded | __ | F | Aluminum, Brass, Cast Iron, Sheet Metal | 50 | 000000000 | 000000 |
1/4"-20 | |||||||||||
| 1/2" | 0.477" | 0.153" | T30 | No. 1 | Fully Threaded | __ | F | Aluminum, Brass, Cast Iron, Sheet Metal | 25 | 000000000 | 00000 |
| 3/4" | 0.477" | 0.153" | T30 | No. 1 | Fully Threaded | __ | F | Aluminum, Brass, Cast Iron, Sheet Metal | 25 | 000000000 | 00000 |
| 1" | 0.477" | 0.153" | T30 | No. 1 | Fully Threaded | __ | F | Aluminum, Brass, Cast Iron, Sheet Metal | 100 | 000000000 | 00000 |
| 1 1/4" | 0.477" | 0.153" | T30 | No. 1 | Fully Threaded | __ | F | Aluminum, Brass, Cast Iron, Sheet Metal | 100 | 000000000 | 00000 |
| 1 1/2" | 0.477" | 0.153" | T30 | No. 1 | Fully Threaded | __ | F | Aluminum, Brass, Cast Iron, Sheet Metal | 50 | 000000000 | 00000 |
| 1 3/4" | 0.477" | 0.153" | T30 | No. 1 | Fully Threaded | __ | F | Aluminum, Brass, Cast Iron, Sheet Metal | 50 | 000000000 | 00000 |
| 2" | 0.477" | 0.153" | T30 | No. 1 | Fully Threaded | __ | F | Aluminum, Brass, Cast Iron, Sheet Metal | 50 | 000000000 | 00000 |
| 2 1/4" | 0.477" | 0.153" | T30 | No. 1 | Fully Threaded | __ | F | Aluminum, Brass, Cast Iron, Sheet Metal | 50 | 000000000 | 00000 |
| 2 1/2" | 0.477" | 0.153" | T30 | No. 1 | Fully Threaded | __ | F | Aluminum, Brass, Cast Iron, Sheet Metal | 50 | 000000000 | 00000 |
| 2 3/4" | 0.477" | 0.153" | T30 | No. 1 | Fully Threaded | __ | F | Aluminum, Brass, Cast Iron, Sheet Metal | 25 | 000000000 | 00000 |
| 3" | 0.477" | 0.153" | T30 | No. 1 | Fully Threaded | __ | F | Aluminum, Brass, Cast Iron, Sheet Metal | 25 | 000000000 | 00000 |
| 3 1/2" | 0.477" | 0.153" | T30 | No. 1 | Fully Threaded | __ | F | Aluminum, Brass, Cast Iron, Sheet Metal | 25 | 000000000 | 00000 |
| 4" | 0.477" | 0.153" | T30 | No. 1 | Fully Threaded | __ | F | Aluminum, Brass, Cast Iron, Sheet Metal | 25 | 000000000 | 00000 |
| 4 1/2" | 0.477" | 0.153" | T30 | No. 1 | Fully Threaded | __ | F | Aluminum, Brass, Cast Iron, Sheet Metal | 1 | 000000000 | 0000 |
| 5" | 0.477" | 0.153" | T30 | No. 1 | Fully Threaded | __ | F | Aluminum, Brass, Cast Iron, Sheet Metal | 1 | 000000000 | 0000 |
| 6" | 0.477" | 0.153" | T30 | No. 1 | Partially Threaded | 4" | F | Aluminum, Brass, Cast Iron, Sheet Metal | 1 | 000000000 | 0000 |
5/16"-18 | |||||||||||
| 3/4" | 0.597" | 0.191" | T40 | L | Fully Threaded | __ | F | Aluminum, Brass, Cast Iron, Sheet Metal | 10 | 000000000 | 00000 |
| 1" | 0.597" | 0.191" | T40 | L | Fully Threaded | __ | F | Aluminum, Brass, Cast Iron, Sheet Metal | 50 | 000000000 | 00000 |
| 1 1/4" | 0.597" | 0.191" | T40 | L | Fully Threaded | __ | F | Aluminum, Brass, Cast Iron, Sheet Metal | 50 | 000000000 | 00000 |
| 1 1/2" | 0.597" | 0.191" | T40 | L | Fully Threaded | __ | F | Aluminum, Brass, Cast Iron, Sheet Metal | 50 | 000000000 | 00000 |
| 1 3/4" | 0.597" | 0.191" | T40 | L | Fully Threaded | __ | F | Aluminum, Brass, Cast Iron, Sheet Metal | 50 | 000000000 | 00000 |
| 2" | 0.597" | 0.191" | T40 | L | Fully Threaded | __ | F | Aluminum, Brass, Cast Iron, Sheet Metal | 50 | 000000000 | 00000 |
| 2 1/4" | 0.597" | 0.191" | T40 | L | Fully Threaded | __ | F | Aluminum, Brass, Cast Iron, Sheet Metal | 25 | 000000000 | 00000 |
| 2 1/2" | 0.597" | 0.191" | T40 | L | Fully Threaded | __ | F | Aluminum, Brass, Cast Iron, Sheet Metal | 25 | 000000000 | 00000 |
| 3" | 0.597" | 0.191" | T40 | L | Fully Threaded | __ | F | Aluminum, Brass, Cast Iron, Sheet Metal | 25 | 000000000 | 00000 |
| 3 1/2" | 0.597" | 0.191" | T40 | L | Fully Threaded | __ | F | Aluminum, Brass, Cast Iron, Sheet Metal | 5 | 000000000 | 00000 |
| 4" | 0.597" | 0.191" | T40 | L | Fully Threaded | __ | F | Aluminum, Brass, Cast Iron, Sheet Metal | 1 | 000000000 | 0000 |
| 5" | 0.597" | 0.191" | T40 | L | Fully Threaded | __ | F | Aluminum, Brass, Cast Iron, Sheet Metal | 1 | 000000000 | 0000 |
| 6" | 0.597" | 0.191" | T40 | L | Partially Threaded | 4" | F | Aluminum, Brass, Cast Iron, Sheet Metal | 1 | 000000000 | 0000 |
3/8"-16 | |||||||||||
| 1" | 0.717" | 0.23" | T40 | T | Fully Threaded | __ | F | Aluminum, Brass, Cast Iron, Sheet Metal | 5 | 000000000 | 00000 |
| 1 1/4" | 0.717" | 0.23" | T40 | T | Fully Threaded | __ | F | Aluminum, Brass, Cast Iron, Sheet Metal | 5 | 000000000 | 00000 |
| 1 1/2" | 0.717" | 0.23" | T40 | T | Fully Threaded | __ | F | Aluminum, Brass, Cast Iron, Sheet Metal | 10 | 000000000 | 00000 |
| 2" | 0.717" | 0.23" | T40 | T | Fully Threaded | __ | F | Aluminum, Brass, Cast Iron, Sheet Metal | 25 | 000000000 | 00000 |
| 2 1/2" | 0.717" | 0.23" | T40 | T | Fully Threaded | __ | F | Aluminum, Brass, Cast Iron, Sheet Metal | 1 | 000000000 | 0000 |
| 3" | 0.717" | 0.23" | T40 | T | Fully Threaded | __ | F | Aluminum, Brass, Cast Iron, Sheet Metal | 1 | 000000000 | 0000 |
Zinc-Plated Steel | |||||||||||
6-32 | |||||||||||
| 3/8" | 0.262" | 0.083" | T10 | 31 | Fully Threaded | __ | F | Aluminum, Brass, Cast Iron, Sheet Metal | 50 | 000000000 | 00000 |
| 1/2" | 0.262" | 0.083" | T10 | 31 | Fully Threaded | __ | F | Aluminum, Brass, Cast Iron, Sheet Metal | 50 | 000000000 | 00000 |
| 3/4" | 0.262" | 0.083" | T10 | 31 | Fully Threaded | __ | F | Aluminum, Brass, Cast Iron, Sheet Metal | 100 | 000000000 | 00000 |
8-32 | |||||||||||
| 1/2" | 0.312" | 0.1" | T15 | 26 | Fully Threaded | __ | F | Aluminum, Brass, Cast Iron, Sheet Metal | 100 | 000000000 | 00000 |
| 3/4" | 0.312" | 0.1" | T15 | 26 | Fully Threaded | __ | F | Aluminum, Brass, Cast Iron, Sheet Metal | 50 | 000000000 | 00000 |
10-24 | |||||||||||
| 5/8" | 0.362" | 0.116" | T20 | No. 17 | Fully Threaded | __ | F | Aluminum, Brass, Cast Iron, Sheet Metal | 50 | 000000000 | 00000 |
| 3/4" | 0.362" | 0.116" | T20 | No. 17 | Fully Threaded | __ | F | Aluminum, Brass, Cast Iron, Sheet Metal | 50 | 000000000 | 00000 |
| 1" | 0.362" | 0.116" | T20 | No. 17 | Fully Threaded | __ | F | Aluminum, Brass, Cast Iron, Sheet Metal | 25 | 000000000 | 00000 |
12-24 | |||||||||||
| 1" | 0.412" | 0.132" | T25 | No. 8 | Fully Threaded | __ | F | Aluminum, Brass, Cast Iron, Sheet Metal | 25 | 000000000 | 00000 |
1/4"-20 | |||||||||||
| 1/2" | 0.477" | 0.153" | T27 | No. 1 | Fully Threaded | __ | F | Aluminum, Brass, Cast Iron, Sheet Metal | 25 | 000000000 | 00000 |
| 5/8" | 0.477" | 0.153" | T27 | No. 1 | Fully Threaded | __ | F | Aluminum, Brass, Cast Iron, Sheet Metal | 25 | 000000000 | 00000 |
| 3/4" | 0.477" | 0.153" | T27 | No. 1 | Fully Threaded | __ | F | Aluminum, Brass, Cast Iron, Sheet Metal | 25 | 000000000 | 00000 |
| 1" | 0.477" | 0.153" | T27 | No. 1 | Fully Threaded | __ | F | Aluminum, Brass, Cast Iron, Sheet Metal | 25 | 000000000 | 00000 |
| 1 1/4" | 0.477" | 0.153" | T27 | No. 1 | Fully Threaded | __ | F | Aluminum, Brass, Cast Iron, Sheet Metal | 25 | 000000000 | 00000 |
| 1 1/2" | 0.477" | 0.153" | T27 | No. 1 | Fully Threaded | __ | F | Aluminum, Brass, Cast Iron, Sheet Metal | 25 | 000000000 | 00000 |
Steel Thread-Cutting Small-Head Screws for
Softwood and Plastic-Wood Composites
Because these steel screws cut threads into drilled holes as they’re turned, they require less driving torque and cause less stress on material than thread-forming screws. Also known as trim-head deck screws, they have a small flat head and slender shank to reduce the risk of splitting boards. Their thin head also means they won't stick out of decking, trim, and other finished surfaces. With a corrosion-resistant coating, these screws resist up to 1,500 hours of salt spray. They're green, so they blend in with most treated wood.
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 | Approximate Threads per Inch | Threading | Min. Thread Lg. | Pkg. Qty. | Pkg. | |
Corrosion-Resistant-Coated Steel | ||||||||||
No. 8 | ||||||||||
| 2" | 0.256" | 0.125" | T-15 | 1/8" | 10 | Partially Threaded | 1.4" | 50 | 000000000 | 000000 |
| 2 1/2" | 0.256" | 0.125" | T-15 | 1/8" | 10 | Partially Threaded | 1.67" | 50 | 000000000 | 00000 |
| 3" | 0.256" | 0.125" | T-15 | 1/8" | 10 | Partially Threaded | 2.07" | 25 | 000000000 | 00000 |
| 3 1/2" | 0.256" | 0.125" | T-15 | 1/8" | 10 | Partially Threaded | 2.42" | 25 | 000000000 | 00000 |
Distortion-Free Screws for Plastic-Wood Composites
Threads change direction to cut into composites and push material back into the hole to prevent distorting the surface around the hole. Also known as trim-head deck screws, these have a small flat head and slender shank to reduce the risk of splitting. They have a Type 17 auger point to penetrate softwood and plastic-wood composite decking material. A Torx drive allows you to apply extra force with less slippage or damage to the recess. Made from 18-8 stainless steel, they have good chemical resistance and are a good choice for ACQ-treated (arsenic-free) lumber. They may be mildly magnetic. Length is measured from the top of the head.
For technical drawings and 3-D models, click on a part number.