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1/4UNC x 1"25 Pcs About Hex Socket Drives Hex Socket drives, also known as Internal Hex drives, have a hexagonal hole in the center that requires an Allen key, also known as a hex key or Allen wrenchWhat are UNF Threads and UNC Threads?UNC UNF Thread Per Inch TPI Threads Per Inch Thread Count (TPI) Explained TPI stands for Threads Per Inch which is simply a count of the number of threads per inch measured along the length of a fastenerThis description is used only with American fasteners 1 4 Unc 3b Thread Plug Gage Go No Go P D S Are 2175 2211 1 4 Unc 3b 143bp1 M J Tooling Llc 1/4 20 unc nut