Fasteners &Tightening Strategies
in Aerospace Industry
In the Aerospace Industry, the tightening unit, known as a fastener, consists of the pin (bolt) and the collar (nut). Our tools are customized to meet a wide range of standards for both pins and collars.
Standard: Bolt, without any type of recess
Hold & Drive: A pin with a recess (usually hexagonal, five lobe also available) that allows the pin to be held while tightening the collar.
Standard: Nut
Bi-Hex: Consists of two hexagon-shaped parts linked by a frangible section.
Frangible collar: Consists of two parts, a lower cylindrical-shaped section and an upper hexagon-shaped section, linked by a frangible section.
Torque (T): The bolt or the pin is tightened to a final target torque.
Pre-torque (PT): Used for the first step of tightening Bi-Hex collars. The collar is tightened to a target torque, for that, the output socket of the GFA embraces both hexagons simultaneously.
Shear-off (SO): Used in two cases:
For the second step of tightening Bi-Hex collars, where the output socket is specially design to embrace only the upper hexagon
For Frangible collars.
In both cases the end of the tightening is determined by the shearing-off of frangible section.
