About Tapping Screws
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Thread-Forming Screws for Hard Metal
Also known as Tap-Flex screws, these are made from hardened steel to penetrate hard material. They have a five-edged shank that presses tightly against the material to form threads and resist loosening. A hex head allows for a secure grip with a wrench and a flange reduces the risk of crushing thin metal. They create machine screw threads in drilled holes for a tight, vibration-resistant assembly. Made from steel, they are coated to resist corrosion in wet environments. Length is measured from under the flange.
Head | |||||||||
|---|---|---|---|---|---|---|---|---|---|
| Lg. | Wd. | Ht. | Flange Dia. | Drill Bit Size | Threading | Min. Thread Length | For Use In | Each | |
Ultra-Corrosion-Resistant Coated Steel | |||||||||
3/8"-16 | |||||||||
| 1 1/2" | 0.563" | 0.358" | 0.78" | 8.5 mm | Fully Threaded | __ | Steel, Sheet Metal | 000000000 | 00000 |
| 2" | 0.563" | 0.358" | 0.78" | 8.5 mm | Fully Threaded | __ | Steel, Sheet Metal | 000000000 | 0000 |
| 3" | 0.563" | 0.358" | 0.78" | 11/32" | Partially Threaded | 2 1/2" | Steel, Sheet Metal | 000000000 | 0000 |
| 4" | 0.563" | 0.358" | 0.78" | 11/32" | Partially Threaded | 2 1/2" | Steel, Sheet Metal | 000000000 | 0000 |
| 5" | 0.563" | 0.358" | 0.78" | 11/32" | Partially Threaded | 2 1/2" | Steel, Sheet Metal | 000000000 | 0000 |
1/2"-13 | |||||||||
| 1 1/2" | 0.75" | 0.485" | 1.04" | 29/64" | Fully Threaded | __ | Steel, Sheet Metal | 000000000 | 0000 |
| 2" | 0.75" | 0.485" | 1.04" | 29/64" | Fully Threaded | __ | Steel, Sheet Metal | 000000000 | 0000 |
| 2 1/2" | 0.75" | 0.485" | 1.04" | 29/64" | Fully Threaded | __ | Steel, Sheet Metal | 000000000 | 0000 |
| 3" | 0.75" | 0.4" | 1.04" | 29/64" | Partially Threaded | 2 1/2" | Steel, Sheet Metal | 000000000 | 0000 |
| 4" | 0.75" | 0.4" | 1.04" | 29/64" | Partially Threaded | 2 1/2" | Steel, Sheet Metal | 000000000 | 0000 |
| 5" | 0.75" | 0.4" | 1.04" | 29/64" | Partially Threaded | 2 1/2" | Steel, Sheet Metal | 000000000 | 0000 |
5/8"-11 | |||||||||
| 1 1/2" | 0.75" | 0.485" | 1.04" | 37/64" | Fully Threaded | __ | Steel, Sheet Metal | 000000000 | 0000 |
| 2" | 0.75" | 0.485" | 1.04" | 37/64" | Fully Threaded | __ | Steel, Sheet Metal | 000000000 | 0000 |
| 2 1/2" | 0.75" | 0.485" | 1.04" | 37/64" | Fully Threaded | __ | Steel, Sheet Metal | 000000000 | 0000 |
| 3" | 0.938" | 0.501" | 1.29" | 37/64" | Partially Threaded | 2 1/2" | Steel, Sheet Metal | 000000000 | 0000 |
| 4" | 0.938" | 0.501" | 1.29" | 37/64" | Partially Threaded | 2 1/2" | Steel, Sheet Metal | 000000000 | 0000 |
| 5" | 0.938" | 0.501" | 1.29" | 37/64" | Partially Threaded | 2 1/2" | Steel, Sheet Metal | 000000000 | 0000 |
Alloy Steel Hex Head Drilling Screws for Aluminum
Known for their strength, these alloy steel screws are coated to provide corrosion resistance in wet environments. Use them to fasten aluminum to aluminum and steel framing. The hex head allows for a secure grip with a wrench and a flange reduces the risk of crushing thin metal. They save you time and effort by drilling their own holes and fastening in a single operation. Length is measured from under the flange. Head height includes the flange.
Drill Tip | Head | |||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Lg. | Type | Lg. | Max. Drilling Thick. | Wd. | Ht. | Flange Dia. | Thread Size | Approximate Threads per Inch | For Use In | Pkg. Qty. | Pkg. | |
Ultra-Corrosion-Resistant Coated Alloy Steel | ||||||||||||
No. 10 | ||||||||||||
| 3/4" | No. 3 | 1/4" | 0.15" | 0.313" | 0.151" | 0.414" | __ | 16 | Aluminum, Sheet Metal | 25 | 000000000 | 000000 |
No. 12 | ||||||||||||
| 7/8" | No. 3 | 9/32" | 0.187" | 0.313" | 0.194" | 0.432" | __ | 14 | Aluminum, Sheet Metal | 25 | 000000000 | 00000 |
| 1" | No. 3 | 9/32" | 0.187" | 0.313" | 0.194" | 0.432" | __ | 14 | Aluminum, Sheet Metal | 25 | 000000000 | 00000 |
| 1 1/2" | No. 3 | 9/32" | 0.187" | 0.313" | 0.194" | 0.432" | __ | 14 | Aluminum, Sheet Metal | 25 | 000000000 | 00000 |
| 1 3/4" | No. 5 | 45/64" | 0.5" | 0.313" | 0.194" | 0.432" | 12-24 | __ | Aluminum, Sheet Metal | 10 | 000000000 | 00000 |
| 2" | No. 3 | 9/32" | 0.187" | 0.313" | 0.194" | 0.432" | __ | 14 | Aluminum, Sheet Metal | 25 | 000000000 | 00000 |
1/4" | ||||||||||||
| 1" | No. 3 | 5/16" | 0.21" | 0.375" | 0.24" | 0.52" | __ | 14 | Aluminum, Sheet Metal | 10 | 000000000 | 00000 |
| 1 1/8" | No. 4 | 5/16" | 0.236" | 0.375" | 0.24" | 0.52" | 1/4"-20 | __ | Aluminum, Sheet Metal | 10 | 000000000 | 00000 |
| 1 1/2" | No. 3 | 5/16" | 0.21" | 0.375" | 0.24" | 0.52" | __ | 14 | Aluminum, Sheet Metal | 10 | 000000000 | 00000 |
| 1 1/2" | No. 4 | 5/16" | 0.236" | 0.375" | 0.24" | 0.52" | 1/4"-20 | __ | Aluminum, Sheet Metal | 10 | 000000000 | 00000 |
| 2" | No. 3 | 5/16" | 0.21" | 0.375" | 0.24" | 0.52" | __ | 14 | Aluminum, Sheet Metal | 10 | 000000000 | 0000 |
| 2" | No. 4 | 5/16" | 0.236" | 0.375" | 0.24" | 0.52" | 1/4"-20 | __ | Aluminum, Sheet Metal | 10 | 000000000 | 00000 |
| 2 1/2" | No. 4 | 5/16" | 0.236" | 0.375" | 0.24" | 0.52" | 1/4"-20 | __ | Aluminum, Sheet Metal | 10 | 000000000 | 00000 |
Strip-Resistant Drilling Screws for Metal
Serrations under the head act as a brake to prevent overtightening and damaging threads. The flange reduces the risk of crushing thin metal. They save you time and effort by drilling their own holes and fastening in a single operation. A hex head provides a larger gripping area for installation with a wrench or socket driver. Length is measured from under the flange. Head height includes the flange.
Ultra-corrosion-resistant-coated steel screws are more corrosion resistant than zinc-plated screws.
Drill Tip | Head | ||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|
| Lg. | Type | Lg. | Max. Drilling Thick. | Wd. | Ht. | Flange Dia. | Approximate Threads per Inch | For Use In | Pkg. Qty. | Pkg. | |
External Hex—Ultra-Corrosion-Resistant-Coated Steel | |||||||||||
1/4" | |||||||||||
| 3/4" | No. 3 | 13/32" | 0.21" | 0.438" | 0.23" | 0.575" | 14 | Steel, Sheet Metal | 50 | 000000000 | 000000 |