Raised countersunk tapping screw, shape C with Z recessed head DIN 7981, steel, zinc-plated, blue passivated (A2K), PZ drive, round head, shape C
DIN 7981 steel zinc plated pan head Z shape C
SCR-PANHD-DIN7981-C-Z2-(A2K)-3,9X16
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Tapping screws belong to the thread-moulding screw family. When screwed into a pre-prepared core hole, these screws shape their own counter-thread.
Guideline values for selecting the correct core hole diameter are contained in DIN 7975.
Shape C = thread with tip
Shape F = thread without tip
Shape R = thread with rounded tip
 | |
Material | Steel |
Surface | Zinc plated |
Form | C |
Nominal diameter (d1) | 3.9 mm |
Length (l1) | 16 mm |
Head diameter (dk) | 7.5 mm |
Head height (k1) | 2.8 mm |
Internal drive | Z2 |
DIN | 7981 |
Head type | Pan head |
Declaration of performance (EU-CPR) | No |
Standards | DIN 7981 |
Thread type | Self-tapping screw thread |
Thread design | Full thread |
Shape of tip | C |
| Thread size | St 2.2 | St 2.9 | St 3.5 | St 3.9 | St 4.2 | St 4.8 | St 5.5 | St 6.3 | St 8 | St 9.5 |
| Min. sheet thickness (mm) | 0,8 | 1,1 | 1,3 | 1,3 | 1,4 | 1,6 | 1,8 | 1,8 | 2,1 | 2,1 |
| Max. sheet thickness (mm) | 1,8 | 2,2 | 2,8 | 3 | 3,5 | 4 | 4,5 | 5 | 6,5 | 7,5 |
| Pre-drilling diameter (mm) | 1,2 | 2,1 | 2,6 | 2,8 | 3,0 | 3,5 | 4,1 | 4,7 | 6,1 | 7,7 |
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