It is advised that the symbols be used when the threads have a diameter smaller than one inch.
It is advised to use the American Standards Association regular thread sign, also known as the external thread symbol, in assembly drawings. The thread's crests are depicted by light lines that are not spaced evenly for scale.
Internal Thread Symbols. Internal threads should utilize the American Standard regular thread symbols. Internal thread symbols that are American Standard-simplified.The most common thread types are the inch-based Unified coarse / fine (UNC/UNF) and metric coarse / fine.
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