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Range of Unified National Coarse (UNC) & Unified National Fine (UNF) fasteners such as set screws, bolts & nuts. These threads have a higher number of threads per inch, resulting in a tighter and more precise fit when engaged with a mating part.
UNC threads are unified coarse-pitch threads. These are less likely to cross-thread allowing faster assembly and disassembly (Generally used in mass production). Large threads also allow for thicker plating and coatings.
UNF threads have a finer pitch than UNC threads. This means there are more threads per inch, resulting in a greater number of engaged threads and a stronger connection.
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