In this picture, we can see the screw fastening the Halo to the monocoque, and which is usually masked by a black sticker.
The technical regulations have introduced new crash tests to ensure the strength of the Halo. While the titanium carcass is manufactured by one of the three approved suppliers, the bindings in the chassis are the responsibility of the teams. The survival cell and the fasteners must withstand different loads applied for five seconds at four locations: 11.6 tons on the top of the frame, 4.6 and 8.3 tons longitudinally at the front and 9.3 tons on the sides. In comparison, the roll bar above the pilot’s helmet must support loads of 5 tonnes laterally, 6 tonnes longitudinally and 9 tonnes vertically.