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Ideal for mounting fan trays and other rack-mounted components in data cabinets and enclosures, the OCN Series of cage nuts allows for a better strength-to-weight ratio than threaded holes. Additionally, it provides the flexibility to mount anywhere with metric or SI bolts
Using cage nuts mounted in square holes provides several benefits over threaded holes directly in the cage. First, one has the flexibility to choose the size of nuts and bolts (like metric vs imperial) at a time after the cage is installed. This also includes mix-and-matching within one cage. Second, they're easily replaceable. Contrast to a pre-threaded cage where if the threads are stripped it becomes more difficult to make use of the hole. Third, this can allow for a better strength-to-weight ratio, as only the nuts need to be made of a strong material suitable for threading.
The nut is usually slightly loose in the cage to allow for minor adjustments in alignment. The gap between the two wings determines thickness of material that will hold nut in correct position without pulling it from the base material. The size of square hole will also govern the position of nut. If size of hole is too large it will still pull out from base material.