Inzuzo:
Intambo yeTrapezoidal ikwabizwa ngokuba yi-Aike female thread.Umsonto uncinci kancinci, kodwa unokulungiswa nge nut emva kokugqoka.I-angle yentambo ye-metric yi-degrees ezingama-30, kwaye i-angle ye-inch thread yi-29 degrees.Ngokuqhelekileyo isetyenziselwa isikrufu sokukhokela selathe.Isimboli ngu "TR".