L-shaped Hex keys are ideal for tightening the screws.
Automatic Fasteners with a through bore for the fastening screw have a counter-clockwise thread on the outside to prevent the fastener from twisting when the screw is tightened.
| Hex Key | Hex Key | |||
| a (mm) | S1 | S2 | ||
| 0.0.391.60 | Automatic-Fastening Set 5, bright zinc-plated | 6.8 | 4 A/F | 3 A/F |
| 0.0.419.71 | Automatic-Fastening Set 6, bright zinc-plated | 9.5 | 5 A/F | 4 A/F |
| 0.0.388.08 | Automatic-Fastening Set 8, bright zinc-plated | 13.2 | 6 A/F | 5 A/F |
| 0.0.441.67 | Automatic-Fastening Set 6, stainless | 9.5 | 5 A/F | 4 A/F |
| 0.0.440.58 | Automatic-Fastening Set 8, stainless | 13.2 | 6 A/F | 5 A/F |
These fastening sets can be installed easily into existing constructions.