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About Tapping Screws
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Compare drilling, pointed, thread-forming, and thread-cutting tips to find the best choice for your material.
Steel Hex Head Thread-Cutting Screws for Metal
External Hex/Slotted with Flange
These steel screws are zinc plated to resist corrosion in wet environments. They have a hex head for a secure grip with a wrench and a flange to reduce the risk of crushing thin metal. Screws 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 under the flange. Head height includes the flange.
Screws meet ASME B18.6.3 dimensional standards. They also meet SAE J933 standards for material quality.
Head | ||||||||||
|---|---|---|---|---|---|---|---|---|---|---|
| Lg. | Wd. | Ht. | Flange Dia. | Drill Bit Size | Tapping Screw Type | For Use In | Specifications Met | Pkg. Qty. | Pkg. | |
External Hex/Slotted—Zinc-Plated Steel | ||||||||||
4-40  | ||||||||||
| 1/4" | 0.188" | 0.079" | 0.243" | No. 41 | F | Aluminum, Brass, Cast Iron, Sheet Metal | ASME B18.6.3, SAE J933 | 100 | 000000000 | 00000 |
| 3/8" | 0.188" | 0.079" | 0.243" | No. 41 | F | Aluminum, Brass, Cast Iron, Sheet Metal | ASME B18.6.3, SAE J933 | 100 | 000000000 | 00000 |
6-32 | ||||||||||
| 1/4" | 0.25" | 0.118" | 0.328" | No. 31 | F | Aluminum, Brass, Cast Iron, Sheet Metal | ASME B18.6.3, SAE J933 | 100 | 000000000 | 00000 |
| 5/16" | 0.25" | 0.118" | 0.328" | No. 31 | F | Aluminum, Brass, Cast Iron, Sheet Metal | ASME B18.6.3, SAE J933 | 100 | 000000000 | 00000 |
| 3/8" | 0.25" | 0.118" | 0.328" | No. 31 | F | Aluminum, Brass, Cast Iron, Sheet Metal | ASME B18.6.3, SAE J933 | 100 | 000000000 | 00000 |
| 1/2" | 0.25" | 0.118" | 0.328" | No. 31 | F | Aluminum, Brass, Cast Iron, Sheet Metal | ASME B18.6.3, SAE J933 | 100 | 000000000 | 00000 |
| 3/4" | 0.25" | 0.118" | 0.328" | No. 31 | F | Aluminum, Brass, Cast Iron, Sheet Metal | ASME B18.6.3, SAE J933 | 100 | 000000000 | 00000 |
| 1" | 0.25" | 0.118" | 0.328" | No. 31 | F | Aluminum, Brass, Cast Iron, Sheet Metal | ASME B18.6.3, SAE J933 | 100 | 000000000 | 00000 |
| 2" | 0.25" | 0.118" | 0.328" | No. 31 | F | Aluminum, Brass, Cast Iron, Sheet Metal | ASME B18.6.3, SAE J933 | 25 | 000000000 | 0000 |
8-32 | ||||||||||
| 1/4" | 0.25" | 0.141" | 0.348" | No. 26 | F | Aluminum, Brass, Cast Iron, Sheet Metal | ASME B18.6.3, SAE J933 | 100 | 000000000 | 00000 |
| 5/16" | 0.25" | 0.141" | 0.348" | No. 26 | F | Aluminum, Brass, Cast Iron, Sheet Metal | ASME B18.6.3, SAE J933 | 100 | 000000000 | 00000 |
| 3/8" | 0.25" | 0.141" | 0.348" | No. 26 | F | Aluminum, Brass, Cast Iron, Sheet Metal | ASME B18.6.3, SAE J933 | 100 | 000000000 | 00000 |
| 1/2" | 0.25" | 0.141" | 0.348" | No. 26 | F | Aluminum, Brass, Cast Iron, Sheet Metal | ASME B18.6.3, SAE J933 | 100 | 000000000 | 00000 |
| 5/8" | 0.25" | 0.141" | 0.348" | No. 26 | F | Aluminum, Brass, Cast Iron, Sheet Metal | ASME B18.6.3, SAE J933 | 100 | 000000000 | 00000 |
| 3/4" | 0.25" | 0.141" | 0.348" | No. 26 | F | Aluminum, Brass, Cast Iron, Sheet Metal | ASME B18.6.3, SAE J933 | 100 | 000000000 | 00000 |
| 1" | 0.25" | 0.141" | 0.348" | No. 26 | F | Aluminum, Brass, Cast Iron, Sheet Metal | ASME B18.6.3, SAE J933 | 50 | 000000000 | 00000 |
| 1 1/2" | 0.25" | 0.141" | 0.348" | No. 26 | F | Aluminum, Brass, Cast Iron, Sheet Metal | ASME B18.6.3, SAE J933 | 25 | 000000000 | 0000 |
| 2" | 0.25" | 0.141" | 0.348" | No. 26 | F | Aluminum, Brass, Cast Iron, Sheet Metal | ASME B18.6.3, SAE J933 | 25 | 000000000 | 00000 |
| 2 1/2" | 0.25" | 0.141" | 0.348" | No. 26 | F | Aluminum, Brass, Cast Iron, Sheet Metal | ASME B18.6.3, SAE J933 | 25 | 000000000 | 00000 |
10-24 | ||||||||||
| 1/4" | 0.313" | 0.151" | 0.414" | No. 19 | F | Aluminum, Brass, Cast Iron, Sheet Metal | ASME B18.6.3, SAE J933 | 25 | 000000000 | 0000 |
| 3/8" | 0.313" | 0.151" | 0.414" | No. 19 | F | Aluminum, Brass, Cast Iron, Sheet Metal | ASME B18.6.3, SAE J933 | 100 | 000000000 | 00000 |
| 1/2" | 0.313" | 0.151" | 0.414" | No. 19 | F | Aluminum, Brass, Cast Iron, Sheet Metal | ASME B18.6.3, SAE J933 | 100 | 000000000 | 00000 |
| 5/8" | 0.313" | 0.151" | 0.414" | No. 19 | F | Aluminum, Brass, Cast Iron, Sheet Metal | ASME B18.6.3, SAE J933 | 100 | 000000000 | 00000 |
| 3/4" | 0.313" | 0.151" | 0.414" | No. 19 | F | Aluminum, Brass, Cast Iron, Sheet Metal | ASME B18.6.3, SAE J933 | 100 | 000000000 | 00000 |
| 1" | 0.313" | 0.151" | 0.414" | No. 19 | F | Aluminum, Brass, Cast Iron, Sheet Metal | ASME B18.6.3, SAE J933 | 100 | 000000000 | 00000 |
| 1 1/4" | 0.313" | 0.151" | 0.414" | No. 19 | F | Aluminum, Brass, Cast Iron, Sheet Metal | ASME B18.6.3, SAE J933 | 25 | 000000000 | 0000 |
| 1 1/2" | 0.313" | 0.151" | 0.414" | No. 19 | F | Aluminum, Brass, Cast Iron, Sheet Metal | ASME B18.6.3, SAE J933 | 25 | 000000000 | 00000 |
| 2" | 0.313" | 0.151" | 0.414" | No. 19 | F | Aluminum, Brass, Cast Iron, Sheet Metal | ASME B18.6.3, SAE J933 | 10 | 000000000 | 0000 |
10-32 | ||||||||||
| 1/4" | 0.313" | 0.151" | 0.414" | 11/64" | F | Aluminum, Brass, Cast Iron, Sheet Metal | ASME B18.6.3, SAE J933 | 100 | 000000000 | 00000 |
| 3/8" | 0.313" | 0.151" | 0.414" | 11/64" | F | Aluminum, Brass, Cast Iron, Sheet Metal | ASME B18.6.3, SAE J933 | 100 | 000000000 | 00000 |
| 1/2" | 0.313" | 0.151" | 0.414" | 11/64" | F | Aluminum, Brass, Cast Iron, Sheet Metal | ASME B18.6.3, SAE J933 | 100 | 000000000 | 00000 |
| 5/8" | 0.313" | 0.151" | 0.414" | 11/64" | F | Aluminum, Brass, Cast Iron, Sheet Metal | ASME B18.6.3, SAE J933 | 100 | 000000000 | 00000 |
| 3/4" | 0.313" | 0.151" | 0.414" | 11/64" | F | Aluminum, Brass, Cast Iron, Sheet Metal | ASME B18.6.3, SAE J933 | 100 | 000000000 | 00000 |
| 1" | 0.313" | 0.151" | 0.414" | 11/64" | F | Aluminum, Brass, Cast Iron, Sheet Metal | ASME B18.6.3, SAE J933 | 100 | 000000000 | 00000 |
| 1 1/4" | 0.313" | 0.151" | 0.414" | 11/64" | F | Aluminum, Brass, Cast Iron, Sheet Metal | ASME B18.6.3, SAE J933 | 25 | 000000000 | 00000 |
| 1 1/2" | 0.313" | 0.151" | 0.414" | 11/64" | F | Aluminum, Brass, Cast Iron, Sheet Metal | ASME B18.6.3, SAE J933 | 25 | 000000000 | 00000 |
| 1 3/4" | 0.313" | 0.151" | 0.414" | 11/64" | F | Aluminum, Brass, Cast Iron, Sheet Metal | ASME B18.6.3, SAE J933 | 10 | 000000000 | 0000 |
| 2" | 0.313" | 0.151" | 0.414" | 11/64" | F | Aluminum, Brass, Cast Iron, Sheet Metal | ASME B18.6.3, SAE J933 | 10 | 000000000 | 0000 |
| 2 1/2" | 0.313" | 0.151" | 0.414" | 11/64" | F | Aluminum, Brass, Cast Iron, Sheet Metal | ASME B18.6.3, SAE J933 | 10 | 000000000 | 0000 |
12-24 | ||||||||||
| 3/8" | 0.313" | 0.194" | 0.432" | No. 11 | F | Aluminum, Brass, Cast Iron, Sheet Metal | ASME B18.6.3, SAE J933 | 25 | 000000000 | 00000 |
| 1/2" | 0.313" | 0.194" | 0.432" | No. 11 | F | Aluminum, Brass, Cast Iron, Sheet Metal | ASME B18.6.3, SAE J933 | 50 | 000000000 | 00000 |
| 5/8" | 0.313" | 0.194" | 0.432" | No. 11 | F | Aluminum, Brass, Cast Iron, Sheet Metal | ASME B18.6.3, SAE J933 | 25 | 000000000 | 00000 |
| 3/4" | 0.313" | 0.194" | 0.432" | No. 11 | F | Aluminum, Brass, Cast Iron, Sheet Metal | ASME B18.6.3, SAE J933 | 25 | 000000000 | 00000 |
| 1" | 0.313" | 0.194" | 0.432" | No. 11 | F | Aluminum, Brass, Cast Iron, Sheet Metal | ASME B18.6.3, SAE J933 | 25 | 000000000 | 00000 |
| 1 1/4" | 0.313" | 0.194" | 0.432" | No. 11 | F | Aluminum, Brass, Cast Iron, Sheet Metal | ASME B18.6.3, SAE J933 | 10 | 000000000 | 0000 |
1/4"-20 | ||||||||||
| 3/8" | 0.375" | 0.24" | 0.52" | No. 2 | F | Aluminum, Brass, Cast Iron, Sheet Metal | ASME B18.6.3, SAE J933 | 50 | 000000000 | 00000 |
| 1/2" | 0.375" | 0.24" | 0.52" | No. 2 | F | Aluminum, Brass, Cast Iron, Sheet Metal | ASME B18.6.3, SAE J933 | 50 | 000000000 | 00000 |
| 5/8" | 0.375" | 0.24" | 0.52" | No. 2 | F | Aluminum, Brass, Cast Iron, Sheet Metal | ASME B18.6.3, SAE J933 | 50 | 000000000 | 00000 |
| 3/4" | 0.375" | 0.24" | 0.52" | No. 2 | F | Aluminum, Brass, Cast Iron, Sheet Metal | ASME B18.6.3, SAE J933 | 50 | 000000000 | 00000 |
| 1" | 0.375" | 0.24" | 0.52" | No. 2 | F | Aluminum, Brass, Cast Iron, Sheet Metal | ASME B18.6.3, SAE J933 | 25 | 000000000 | 00000 |
| 1 1/4" | 0.375" | 0.24" | 0.52" | No. 2 | F | Aluminum, Brass, Cast Iron, Sheet Metal | ASME B18.6.3, SAE J933 | 25 | 000000000 | 00000 |
| 1 1/2" | 0.375" | 0.24" | 0.52" | No. 2 | F | Aluminum, Brass, Cast Iron, Sheet Metal | ASME B18.6.3, SAE J933 | 25 | 000000000 | 00000 |
| 1 3/4" | 0.375" | 0.24" | 0.52" | No. 2 | F | Aluminum, Brass, Cast Iron, Sheet Metal | ASME B18.6.3, SAE J933 | 10 | 000000000 | 00000 |
| 2" | 0.375" | 0.24" | 0.52" | No. 2 | F | Aluminum, Brass, Cast Iron, Sheet Metal | ASME B18.6.3, SAE J933 | 25 | 000000000 | 00000 |
| 2 1/2" | 0.375" | 0.24" | 0.52" | No. 2 | F | Aluminum, Brass, Cast Iron, Sheet Metal | ASME B18.6.3, SAE J933 | 5 | 000000000 | 0000 |
5/16"-18 | ||||||||||
| 1/2" | 0.5" | 0.285" | 0.676" | K | F | Aluminum, Brass, Cast Iron, Sheet Metal | ASME B18.6.3, SAE J933 | 10 | 000000000 | 00000 |
| 3/4" | 0.5" | 0.285" | 0.676" | K | F | Aluminum, Brass, Cast Iron, Sheet Metal | ASME B18.6.3, SAE J933 | 10 | 000000000 | 00000 |
| 1" | 0.5" | 0.285" | 0.676" | K | F | Aluminum, Brass, Cast Iron, Sheet Metal | ASME B18.6.3, SAE J933 | 10 | 000000000 | 00000 |
| 1 1/2" | 0.5" | 0.285" | 0.676" | K | F | Aluminum, Brass, Cast Iron, Sheet Metal | ASME B18.6.3, SAE J933 | 5 | 000000000 | 00000 |
3/8"-16 | ||||||||||
| 5/8" | 0.563" | 0.358" | 0.78" | R | F | Aluminum, Brass, Cast Iron, Sheet Metal | ASME B18.6.3, SAE J933 | 5 | 000000000 | 0000 |
| 1" | 0.563" | 0.358" | 0.78" | R | F | Aluminum, Brass, Cast Iron, Sheet Metal | ASME B18.6.3, SAE J933 | 5 | 000000000 | 0000 |
| 1 1/4" | 0.563" | 0.358" | 0.78" | R | F | Aluminum, Brass, Cast Iron, Sheet Metal | ASME B18.6.3, SAE J933 | 5 | 000000000 | 00000 |
| 2" | 0.563" | 0.358" | 0.78" | R | F | Aluminum, Brass, Cast Iron, Sheet Metal | ASME B18.6.3, SAE J933 | 1 | 000000000 | 0000 |
Electrical Grounding Screws
The green color identifies these as grounding screws. They have a flange that provides a wide flat surface for making solid electrical connections. Screws 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 under the flange. Head height includes the flange.
Head | |||||||||
|---|---|---|---|---|---|---|---|---|---|
| Lg. | Wd. | Ht. | Flange Dia. | Drill Bit Size | Tapping Screw Type | For Use In | Pkg. Qty. | Pkg. | |
Green-Dyed Zinc-Plated Steel | |||||||||
6-32 | |||||||||
| 1/4" | 0.25" | 0.118" | 0.328" | No. 31 | F | Aluminum, Brass, Sheet Metal, Steel | 25 | 000000000 | 00000 |
| 3/8" | 0.25" | 0.118" | 0.328" | No. 31 | F | Aluminum, Brass, Sheet Metal, Steel | 25 | 000000000 | 0000 |
8-32 | |||||||||
| 1/4" | 0.25" | 0.141" | 0.348" | No. 26 | F | Aluminum, Brass, Sheet Metal, Steel | 25 | 000000000 | 0000 |
| 5/16" | 0.25" | 0.141" | 0.348" | No. 26 | F | Aluminum, Brass, Sheet Metal, Steel | 25 | 000000000 | 0000 |
| 3/8" | 0.25" | 0.141" | 0.348" | No. 26 | F | Aluminum, Brass, Sheet Metal, Steel | 25 | 000000000 | 0000 |
| 1/2" | 0.25" | 0.141" | 0.348" | No. 26 | F | Aluminum, Brass, Sheet Metal, Steel | 25 | 000000000 | 0000 |
10-24 | |||||||||
| 3/8" | 0.313" | 0.151" | 0.414" | No. 16 | F | Aluminum, Brass, Sheet Metal, Steel | 25 | 000000000 | 0000 |
| 1/2" | 0.313" | 0.151" | 0.414" | No. 16 | F | Aluminum, Brass, Sheet Metal, Steel | 25 | 000000000 | 0000 |
10-32 | |||||||||
| 1/4" | 0.313" | 0.151" | 0.414" | No. 17 | F | Aluminum, Brass, Sheet Metal, Steel | 25 | 000000000 | 0000 |
| 5/16" | 0.313" | 0.151" | 0.414" | No. 17 | F | Aluminum, Brass, Sheet Metal, Steel | 25 | 000000000 | 0000 |
| 3/8" | 0.313" | 0.151" | 0.414" | No. 17 | F | Aluminum, Brass, Sheet Metal, Steel | 25 | 000000000 | 0000 |
| 1/2" | 0.313" | 0.151" | 0.414" | No. 17 | F | Aluminum, Brass, Sheet Metal, Steel | 25 | 000000000 | 0000 |
| 3/4" | 0.313" | 0.151" | 0.414" | No. 17 | F | Aluminum, Brass, Sheet Metal, Steel | 25 | 000000000 | 00000 |