![]() 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. Internal British ISO Pipe Threads (Whitworth Form) Table per.Glossary TDS: (Tap drill size) The size of the hole that must be drilled before a tapping operation.Whitworth British Screw Threads Size Chart BSW&BSF.ISO tap and drill size table chart, fine thread series.ISO Metric Hardware Specifications Table Chart.Internal Dryseal Pipe Thread Tap Drill Sizes Recommendations.Pipe Thread Tap and Drill Size Chart ANSI NPT.Whitworth BS Pipe Thread Size and Tap Drill Table Chart DIN/ISO 228. ![]() ![]()
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