Threads and Fasteners - Cabarrus County Schools

The coarse thread is also used for rapid assembly or disassembly. Fine Thread Series, UNF/UNRF: This is used for applications that require a higher tensile strength than the coarse thread series and where a thin wall is required. Extra-Fine Thread Series, UNEF/UNREF: This is used when the length of engagement is smaller than the fine-thread series. ................
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