![]() ![]() Not supported) UNJ: high stress series thread with large rounded root on external UNR: standard series thread with rounded root. It also plays a role in determining the length of engagement. On aģ/4" diameter screw, 20 threads per inch is considered extra-fine: 3/4-20 UNEF. Threads per inch on a 1/4" diameter screw is considered coarse: 1/4-20 UNC. thread series designation: (UN, UNC, UNF, UNEF, UNS) The thread series is generally relative to the outside diameter of the screw. Number of thread that would fit along a one inch length. Shorter or longer than one inch, the size of the "V" shape is still defined by the NOTE: If the length of the threaded portion of a screw or threaded hole is Size of the "V" shape of the helical portion of a thread. TPI: (Threads per inch) The number of thread, or "V"s along a one inch length which in turns, defines the NOTE: The size of the hexagon of a bolt or nut has no relevance when definingĪ thread size. The biggest externalĭiameter 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. It will work with threaded holes or shafts made by other manufacturers that follow Making a thread that follow these specifications will ensure that Imperial UN: (Imperial Unified National thread form) A standard that describes the shape of an internal or external thread using imperial Of the ANSI/ASME B1.1-1989 specification. The algorithms used for this calculator are based on the "my" best interpretation ![]() Inch, series designation and class tolerances. Glossary Thread calculator: All calculated results are based on Basic outside diameter, number of threads per ![]()
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