DIN 7982 cross recess countersunk self-tapping sheet metal screws are fasteners used to cut threads in pre-drilled, untapped holes. Their thread-forming ability depends on the screw diameter and the thickness of the base material. They have coarse threads and drill points and are suitable for thin sheet metal, resin-bonded plywood, and composite materials. The countersunk design ensures that the screw head is flush with the surface of the base material, with a standard countersink angle of 80 degrees. Available drive types include cross-recess, Phillips, and hexagonal star.
51Fasteners offers a full range of metric and imperial self-tapping screws, with various material and surface treatment options. DIN 7982 cross-recess countersunk self-tapping metal plate screws are available in diameters from M2.2 to M6.3, lengths from 6.5 to 55 millimeters, and materials including galvanized carbon steel and stainless steel 304/316.
DIN 7982 Specifications
- Current norm: DIN ISO 7050
- Equivalent norms: ISO 7050; CSN 021237; UNI 6955.
Type H
| (mm) | P | a max | dk max | dk min | k | No. | M | t min | t max |
|---|---|---|---|---|---|---|---|---|---|
| ST2.2 | 0.8 | 0.8 | 4.3 | 4 | 1.3 | 1 | 2.5 | 1.02 | 1.32 |
| ST2.9 | 1.1 | 1.1 | 5.5 | 5.2 | 1.7 | 1 | 3 | 1.4 | 1.7 |
| ST3.5 | 1.3 | 1.3 | 6.8 | 6.44 | 2.1 | 2 | 4.2 | 1.62 | 2.12 |
| ST3.9 | 1.3 | 1.3 | 7.5 | 7.14 | 2.3 | 2 | 4.6 | 2.03 | 2.53 |
| ST4.2 | 1.4 | 1.4 | 8.1 | 7.74 | 2.5 | 2 | 4.7 | 2.11 | 2.62 |
| ST4.8 | 1.6 | 1.6 | 9.5 | 9.14 | 3 | 2 | 5.1 | 2.59 | 3.1 |
| ST5.5 | 1.8 | 1.8 | 10.8 | 10.37 | 3.4 | 3 | 6.8 | 2.95 | 3.53 |
| ST6.3 | 1.8 | 1.8 | 12.4 | 11.97 | 3.8 | 3 | 7.1 | 3.33 | 3.91 |
Type Z
| (mm) | P | a max | dk max | dk min | k | No. | M | t min | t max |
|---|---|---|---|---|---|---|---|---|---|
| ST2.2 | 0.8 | 0.8 | 4.3 | 4 | 1.3 | 1 | 2.4 | 1.1 | 1.35 |
| ST2.9 | 1.1 | 1.1 | 5.5 | 5.2 | 1.7 | 1 | 2.8 | 1.48 | 1.73 |
| ST3.5 | 1.3 | 1.3 | 6.8 | 6.44 | 2.1 | 2 | 4 | 1.6 | 2.06 |
| ST3.9 | 1.3 | 1.3 | 7.5 | 7.14 | 2.3 | 2 | 4.2 | 1.85 | 2.31 |
| ST4.2 | 1.4 | 1.4 | 8.1 | 7.74 | 2.5 | 2 | 4.4 | 2.05 | 2.51 |
| ST4.8 | 1.6 | 1.6 | 9.5 | 9.14 | 3 | 2 | 5 | 2.64 | 3.1 |
| ST5.5 | 1.8 | 1.8 | 10.8 | 10.37 | 3.4 | 3 | 6.3 | 2.72 | 3.18 |
| ST6.3 | 1.8 | 1.8 | 12.4 | 11.97 | 3.8 | 3 | 7 | 3.38 | 3.84 |