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esimene keermepuur ava keermestamisel (vt keermepuur; vrd lõppkeermepuur), tap used to start the thread in a blind hole for another tap to finish (see: tap; compare: bottoming tap)
eelkeermepuur . Materjalitehnika terminibaas. Estonian Language Institute, Sõnaveeb 2026. https://sonaveeb.ee/search/unif//mtr/eelkeermepuur/1/est (01.08.2026)
