Threaded Cap
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 Spring Type Cap 10mm Threaded Metal Lubricator Oil Cup  US $3.73
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What type of thread used in pen cap?
Multi-lead or multi-start threads are used in pen cap.
Multi-lead or multi-start threads are commonly used in consumer products to decrease the number of turns required to screw on lids and caps. It would be very frustrating to require eight or nine turns of a jar lid to tighten it, or three or four turns of a pen cap to remove it.
Tornos MultiDECO 32-6c - Cap Threaded v T3.0