Self-tapping screws drill their own holes when they’re screwed into materials such as wood, plastic and metal. By using a screwdriver to attach a self-tapping screw, you can create precisely fitted threads. They're ideal for combining two different types of materials or for screwing in areas where access is only one-sided. It’s helpful to use self-tapping screws for products that need to be maintained regularly, such as air-conditioning units or canopies, where you need to dissemble and reassemble the item along the same threads.
| Screw Thread d | P | dk | S |
k Max |
t Min |
| St 4.8 | 1.6 | 8.5 | 4 | 5 | 2.5 |
| St 5.5 | 1.8 | 10 | 5 | 6 | 3 |
| St 6.3 | 1.8 | 10 | 5 | 6 | 3 |