Screw Thread Design - Fastenal
The UNR thread is a modified version of a standard UN thread. The single difference is a mandatory root radius with limits of 0.108 to 0.144 times the thread pitch. When first introduced decades ago, it was necessary to specify UNR (rounded root) …
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www.ring-plug-thread-gages.comwidth of the thread ridge and the thread groove equal. Pitch Line. The pitch line is linear and parallel to the center line of the pitch cylinder. De-fined where thread ridge and thread groove are equal along the length of the thread. Thread Axis. The thread axis is the axis of its pitch cylinder. Actual Size. An actual size is a measured size ...