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| External Hex | Slotted |
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Drill Bit Decimal Size Equivalent Drill Bit DecimalSize Equivalent |
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About Tapping Screws
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Hex Head Thread-Forming Screws for Metal
External Hex
External Hex/Slotted
These screws have a hex head for a secure grip with a wrench and a flange to reduce the risk of crushing thin metal. Also known as Swageform screws, threads at the tip are designed to grab material for a fast start with low torque in a wide range of materials. All are zinc-plated steel to resist corrosion in wet environments. Length is measured from under the flange.
For technical drawings and 3-D models, click on a part number.
Head | ||||||||
|---|---|---|---|---|---|---|---|---|
| Lg. | Wd. | Ht. | Flange Dia. | Drill Bit Size | For Use In | Pkg. Qty. | Pkg. | |
External Hex—Zinc-Plated Steel | ||||||||
3/8"-16 | ||||||||
| 3/4" | 0.563" | 0.358" | 0.78" | 8.6 mm | Steel, Aluminum, Brass, Cast Iron, Sheet Metal | 10 | 000000000 | 000000 |
| 1" | 0.563" | 0.358" | 0.78" | 8.6 mm | Steel, Aluminum, Brass, Cast Iron, Sheet Metal | 10 | 000000000 | 00000 |
| 1 1/4" | 0.563" | 0.358" | 0.78" | 8.6 mm | Steel, Aluminum, Brass, Cast Iron, Sheet Metal | 10 | 000000000 | 00000 |
5/16"-18 | ||||||||
| 1/2" | 0.5" | 0.285" | 0.676" | 7.1 mm | Steel, Aluminum, Brass, Cast Iron, Sheet Metal | 25 | 000000000 | 00000 |
| 3/4" | 0.5" | 0.285" | 0.676" | 7.1 mm | Steel, Aluminum, Brass, Cast Iron, Sheet Metal | 25 | 000000000 | 00000 |
| 1" | 0.5" | 0.285" | 0.676" | 7.1 mm | Steel, Aluminum, Brass, Cast Iron, Sheet Metal | 25 | 000000000 | 00000 |
| 1 1/4" | 0.5" | 0.285" | 0.676" | 7.1 mm | Steel, Aluminum, Brass, Cast Iron, Sheet Metal | 10 | 000000000 | 0000 |
External Hex/Slotted—Zinc-Plated Steel | ||||||||
1/4"-20 | ||||||||
| 1/2" | 0.375" | 0.24" | 0.52" | No. 2 | Steel, Aluminum, Brass, Cast Iron, Sheet Metal | 25 | 000000000 | 00000 |
| 5/8" | 0.375" | 0.24" | 0.52" | No. 2 | Steel, Aluminum, Brass, Cast Iron, Sheet Metal | 25 | 000000000 | 00000 |
| 3/4" | 0.375" | 0.24" | 0.52" | No. 2 | Steel, Aluminum, Brass, Cast Iron, Sheet Metal | 25 | 000000000 | 00000 |
| 1" | 0.375" | 0.24" | 0.52" | No. 2 | Steel, Aluminum, Brass, Cast Iron, Sheet Metal | 25 | 000000000 | 00000 |
| 1 1/4" | 0.375" | 0.24" | 0.52" | No. 2 | Steel, Aluminum, Brass, Cast Iron, Sheet Metal | 10 | 000000000 | 0000 |
10-24 | ||||||||
| 3/8" | 0.313" | 0.151" | 0.414" | No. 19 | Steel, Aluminum, Brass, Cast Iron, Sheet Metal | 50 | 000000000 | 0000 |
| 1/2" | 0.313" | 0.151" | 0.414" | No. 19 | Steel, Aluminum, Brass, Cast Iron, Sheet Metal | 50 | 000000000 | 0000 |
| 5/8" | 0.313" | 0.151" | 0.414" | No. 19 | Steel, Aluminum, Brass, Cast Iron, Sheet Metal | 50 | 000000000 | 00000 |
| 3/4" | 0.313" | 0.151" | 0.414" | No. 19 | Steel, Aluminum, Brass, Cast Iron, Sheet Metal | 50 | 000000000 | 00000 |
| 1" | 0.313" | 0.151" | 0.414" | No. 19 | Steel, Aluminum, Brass, Cast Iron, Sheet Metal | 50 | 000000000 | 00000 |
10-32 | ||||||||
| 3/8" | 0.313" | 0.151" | 0.414" | No. 17 | Steel, Aluminum, Brass, Cast Iron, Sheet Metal | 50 | 000000000 | 0000 |
| 1/2" | 0.313" | 0.151" | 0.414" | No. 17 | Steel, Aluminum, Brass, Cast Iron, Sheet Metal | 50 | 000000000 | 0000 |
| 5/8" | 0.313" | 0.151" | 0.414" | No. 17 | Steel, Aluminum, Brass, Cast Iron, Sheet Metal | 50 | 000000000 | 00000 |
| 3/4" | 0.313" | 0.151" | 0.414" | No. 17 | Steel, Aluminum, Brass, Cast Iron, Sheet Metal | 50 | 000000000 | 00000 |
| 1" | 0.313" | 0.151" | 0.414" | No. 17 | Steel, Aluminum, Brass, Cast Iron, Sheet Metal | 50 | 000000000 | 00000 |
4-40 | ||||||||
| 1/4" | 0.188" | 0.079" | 0.243" | No. 41 | Steel, Aluminum, Brass, Cast Iron, Sheet Metal | 50 | 000000000 | 0000 |
| 3/8" | 0.188" | 0.079" | 0.243" | No. 41 | Steel, Aluminum, Brass, Cast Iron, Sheet Metal | 50 | 000000000 | 0000 |
6-32 | ||||||||
| 1/4" | 0.25" | 0.118" | 0.328" | No. 31 | Steel, Aluminum, Brass, Cast Iron, Sheet Metal | 100 | 000000000 | 00000 |
| 5/16" | 0.25" | 0.118" | 0.328" | No. 31 | Steel, Aluminum, Brass, Cast Iron, Sheet Metal | 100 | 000000000 | 00000 |
| 3/8" | 0.25" | 0.118" | 0.328" | No. 31 | Steel, Aluminum, Brass, Cast Iron, Sheet Metal | 100 | 000000000 | 00000 |
| 1/2" | 0.25" | 0.118" | 0.328" | No. 31 | Steel, Aluminum, Brass, Cast Iron, Sheet Metal | 100 | 000000000 | 00000 |
| 3/4" | 0.25" | 0.118" | 0.328" | No. 31 | Steel, Aluminum, Brass, Cast Iron, Sheet Metal | 50 | 000000000 | 0000 |
8-32 | ||||||||
| 1/4" | 0.25" | 0.141" | 0.348" | No. 26 | Steel, Aluminum, Brass, Cast Iron, Sheet Metal | 100 | 000000000 | 00000 |
| 5/16" | 0.25" | 0.141" | 0.348" | No. 26 | Steel, Aluminum, Brass, Cast Iron, Sheet Metal | 100 | 000000000 | 00000 |
| 3/8" | 0.25" | 0.141" | 0.348" | No. 26 | Steel, Aluminum, Brass, Cast Iron, Sheet Metal | 100 | 000000000 | 00000 |
| 1/2" | 0.25" | 0.141" | 0.348" | No. 26 | Steel, Aluminum, Brass, Cast Iron, Sheet Metal | 100 | 000000000 | 00000 |
| 5/8" | 0.25" | 0.141" | 0.348" | No. 26 | Steel, Aluminum, Brass, Cast Iron, Sheet Metal | 50 | 000000000 | 0000 |
| 3/4" | 0.25" | 0.141" | 0.348" | No. 26 | Steel, Aluminum, Brass, Cast Iron, Sheet Metal | 50 | 000000000 | 0000 |
| 1" | 0.25" | 0.141" | 0.348" | No. 26 | Steel, Aluminum, Brass, Cast Iron, Sheet Metal | 50 | 000000000 | 00000 |
Hex Head Blunt Screws for Sheet Metal
External Hex
External Hex/Slotted
These screws have a hex head for a secure grip with a wrench and a flange to reduce the risk of crushing thin metal. They require a drilled hole to install. Made from steel, they have a zinc plating to resist corrosion in wet environments. Often referred to as Type B thread-forming screws, they require a drilled hole and are typically used in 0.050"-0.200" material. Length is measured from under the flange. Head height includes the flange.
For technical drawings and 3-D models, click on a part number.
Head | ||||||||
|---|---|---|---|---|---|---|---|---|
| Lg. | Wd. | Ht. | Flange Dia. | Drill Bit Size | Approximate Threads per Inch | Pkg. Qty. | Pkg. | |
External Hex—Zinc-Plated Steel | ||||||||
5/16" | ||||||||
| 1/2" | 0.5" | 0.285" | 0.676" | 6.9 mm | 12 | 25 | 000000000 | 00000 |
| 5/8" | 0.5" | 0.285" | 0.676" | 6.9 mm | 12 | 25 | 000000000 | 00000 |
| 3/4" | 0.5" | 0.285" | 0.676" | 6.9 mm | 12 | 25 | 000000000 | 00000 |
| 1" | 0.5" | 0.285" | 0.676" | 6.9 mm | 12 | 25 | 000000000 | 00000 |
3/8" | ||||||||
| 3/4" | 0.563" | 0.358" | 0.78" | 21/64" | 12 | 10 | 000000000 | 0000 |
| 1" | 0.563" | 0.358" | 0.78" | 21/64" | 12 | 10 | 000000000 | 0000 |
External Hex/Slotted—Zinc-Plated Steel | ||||||||
No. 4 | ||||||||
| 1/4" | 0.188" | 0.079" | 0.243" | No. 44 | 24 | 100 | 000000000 | 0000 |
| 3/8" | 0.188" | 0.079" | 0.243" | No. 44 | 24 | 100 | 000000000 | 0000 |
No. 6 | ||||||||
| 1/4" | 0.25" | 0.118" | 0.328" | No. 32 | 20 | 100 | 000000000 | 0000 |
| 3/8" | 0.25" | 0.118" | 0.328" | No. 32 | 20 | 100 | 000000000 | 0000 |
| 1/2" | 0.25" | 0.118" | 0.328" | No. 32 | 20 | 100 | 000000000 | 0000 |
No. 8 | ||||||||
| 1/4" | 0.25" | 0.141" | 0.348" | No. 29 | 18 | 100 | 000000000 | 0000 |
| 3/8" | 0.25" | 0.141" | 0.348" | No. 29 | 18 | 100 | 000000000 | 0000 |
| 1/2" | 0.25" | 0.141" | 0.348" | No. 29 | 18 | 100 | 000000000 | 00000 |
| 3/4" | 0.25" | 0.141" | 0.348" | No. 29 | 18 | 100 | 000000000 | 00000 |
| 1" | 0.25" | 0.141" | 0.348" | No. 29 | 18 | 100 | 000000000 | 00000 |
No. 10 | ||||||||
| 3/8" | 0.313" | 0.151" | 0.414" | No. 21 | 16 | 100 | 000000000 | 00000 |
| 1/2" | 0.313" | 0.151" | 0.414" | No. 21 | 16 | 100 | 000000000 | 00000 |
| 3/4" | 0.313" | 0.151" | 0.414" | No. 21 | 16 | 100 | 000000000 | 00000 |
| 1" | 0.313" | 0.151" | 0.414" | No. 21 | 16 | 50 | 000000000 | 0000 |
1/4" | ||||||||
| 3/8" | 0.375" | 0.24" | 0.52" | 5.5 mm | 14 | 50 | 000000000 | 00000 |
| 1/2" | 0.375" | 0.24" | 0.52" | 5.5 mm | 14 | 50 | 000000000 | 00000 |
| 5/8" | 0.375" | 0.24" | 0.52" | 5.5 mm | 14 | 50 | 000000000 | 00000 |
| 3/4" | 0.375" | 0.24" | 0.52" | 5.5 mm | 14 | 25 | 000000000 | 0000 |
| 1" | 0.375" | 0.24" | 0.52" | 5.5 mm | 14 | 25 | 000000000 | 0000 |
| 1 1/4" | 0.375" | 0.24" | 0.52" | 5.5 mm | 14 | 25 | 000000000 | 0000 |
| 1 1/2" | 0.375" | 0.24" | 0.52" | 5.5 mm | 14 | 25 | 000000000 | 00000 |