NOTE: If the length of the threaded portion of a screw or threaded hole is shorter or longer than one inch, the size of the "V" shape is still defined by the number of thread that would fit along a one inch length. TPI: (Threads per inch) The number of thread, or "V"s along a one inch length which in turns, defines the size of the "V" shape of the helical portion of a thread. NOTE: The size of the hexagon of a bolt or nut has no relevance when defining a thread size. The biggest external diameter of a Screw or the biggest internal diameter of a threaded hole. Outside diameter: This is the biggest diameter of the helical portion of a thread. NOTE: The American Metric UN thread standard is compatible with the international ISO Making a thread that follow these specifications will ensure that it will work with threaded holes or shafts made by other manufacturers that follow theseĬommon specs. Metric UN: (American Metric Unified National thread form) A standard that describes the shape of an internal or external thread using Imperial UN: (Imperial Unified National thread form) A standard that describes the shape of an internal or external thread using imperial inch dimensions. Glossary TDS: (Tap drill size) The size of the hole that must be drilled before a tapping operation.
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