Fastening system

A method of fastening a first aircraft part with a second aircraft part using a bolt and a nut, the first aircraft part having a bolt hole extending therethrough, the bolt hole including a bolt countersink and being defined by a bolt hole surface of the first aircraft part, the second aircraft part defining a nut hole extending therethrough, the nut hole including a nut countersink and being defined by a nut hole surface of the second aircraft part, the bolt having a threaded shank and a bolt head with an undersurface complementarily shaped to the bolt countersink of the first aircraft part, the nut having a nut chamfer complementarily shaped to the nut countersink of the second aircraft part, the method comprising:

• inserting the threaded shank of the bolt in the bolt hole of the first aircraft part and in the nut hole of the second aircraft part;
• threadably engaging the nut to the threaded shank of the bolt to fasten the first aircraft part with the second aircraft part using the bolt and the nut;
• and
• when the nut is being threadably engaged with the threaded shank:
• engaging the undersurface of the bolt head with the bolt countersink of the first aircraft part to cause centering of the bolt hole of the first aircraft part relative to the threaded shank of the bolt to define a first gap between the bolt hole surface and the threaded shank;
• and
• engaging the nut chamfer of the nut with the nut countersink of the second aircraft part to cause centering of the nut hole of the second aircraft part relative to the threaded shank of the bolt to define a second gap between the nut hole surface and the threaded shank;
• wherein the first aircraft part includes a spigot protruding therefrom and the second aircraft part defines a recess adapted for receiving the spigot therein, and when the nut is being threadably engaged with the threaded shank, the spigot is subjected to radial loads for maintaining engagement of the spigot with the recess.