Śruby ze stali specjalnych
Stale odporne na korozję (nierdzewne i kwasoodporne):
| grupa stali | materiał (Werkstoff) | AISI | EN |
| A1 | 1.4305 | 303 | X8CrNiS 18-9 |
| A2 | 1.4301 | 304 | X5CrNi 18-10 |
| A2 | 1.4303 | 305 | X4CrNi 18-12 |
| A3 | 1.4541 | 321 | X6CrNiTi 18-10 |
| A4 | 1.4401 | 316 | X5CrNiMo 17-12-2 |
| A5 | 1.4571 | 316Ti | X6CrNiMoTi 17-12-2 |
| A - | 1.4439 | X2CrNiMoN 17-13-5 | |
| A - | 1.4539 | X1NiCrMoCu 25-20-5 | |
| A - | 1.4529 | X1NiCrMoCuN 25-20-7 | |
| A / F- | 1.4462 | X2CrNiMoN 22-5-3 | |
| C - | 1.4034 | 420 | X46Cr 13 |
| C- | 1.4122 | X39CrMo 17-1 | |
| A - | 1.4310 | 301 | X10CrNi 18-8 |
| C - | 1.4568 | 301 | X7GNiAI 17-7 |
