Fastener assembly having rotation preventing structure

A fastener assembly comprising:

• a first object including a hole formed therein, a lock nut including a tubular body engaged in said hole of said first object and having a first end and a second end, and including a peripheral flap extended radially from said first end of said tubular body and engaged with said first object, and including at least one rib abridging an angular junction between said tubular body and said peripheral flap and engaged into said first object, for securing said lock nut to said first object, and for preventing said lock nut from rotating relative to said first object,
• said first end of said lock nut including a bore formed therein and an inner thread formed in said bore thereof,
• said second end of said lock nut being extended out of said hole of said first object and machined radially and outwardly to engage with said first object, and to solidly secure said at least one rib in said first object, and to prevent said at least one rib from being disengaged from said first object,
• at least one second object engaged onto said first object, and
• a screw engaged through said at least one second object and engaged into said bore of said tubular body and threaded with said inner thread of said tubular body, for solidly securing said first object and said at least one second object together.