GB/T 846,DIN7982,ISO7050-1983,ANSI/ASEM B 18.6.3,available for ISO ROHS,SGS
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 | ST2.2 | ST2.9 | ST3.5 | (ST3.9) | ST4.2 | ST4.8 | ST5.5 | ST6.3 | ||
| P | Pitch | 0.8 | 1.1 | 1.3 | 1.3 | 1.4 | 1.6 | 1.8 | 1.8 | |
| a | 0.8 | 1.1 | 1.3 | 1.3 | 1.4 | 1.6 | 1.8 | 1.8 | ||
| dk | max=nominal size | 4.3 | 5.5 | 6.8 | 7.5 | 8.1 | 9.5 | 10.8 | 12.4 | |
| min | 4 | 5.2 | 6.44 | 7.14 | 7.74 | 9.14 | 10.37 | 11.97 | ||
| k | ≈ | 1.3 | 1.7 | 2.1 | 2.3 | 2.5 | 3 | 3.4 | 3.8 | |
| y | max | Type C | 2 | 2.6 | 3.2 | 3.5 | 3.7 | 4.3 | 5 | 6 |
| Type F | 1.6 | 2.1 | 2.5 | 2.7 | 2.8 | 3.2 | 3.6 | 3.6 | ||
| Socket No. | 1 | 1 | 2 | 2 | 2 | 2 | 3 | 3 | ||
| M1 | ≈ | 2.5 | 3 | 4.2 | 4.6 | 4.7 | 5.1 | 6.8 | 7.1 | |
| M2 | ≈ | 2.4 | 2.8 | 4 | 4.2 | 4.4 | 5 | 6.3 | 7 | |