In 1961-1962 in USSR was tested the helicopter Mi-1MU, carrying two or four falanga anti-tank guided missiles. It was advised to service introduction, but because of swerving series production of the helicopter Mi-1 in production was not adopted.
Hexagonal bolts, 1.4mm
Antonov An-72P, National Guard of Ukraine
Hexagon castle nut 1.8mm DIN 935, 190pcs