Fluteless taps

Claim 1

A FLUTELESS TAP HAVING, IN AXIAL SEQUENCE, A LEADING END, A PRIMARY THREAD ZONE, A TRANSITION THREAD ZONE, AND A SECONDARY THREAD ZONE; EACH OF THE PRIMARY AND SECONDARY THREAD ZONES CONSISTING OF A PLURALITY OF HELICAL TURNS, EACH TURN, VIEWED AXIALLY, HAVING A PLURALITY OF CIRCUMFERENTIALLY SPACED CRESTS, ALL THE CRESTS OF THE PRIMARY THREAD ZONE LYING AT A UNIFORM FIRST RADIUS FROM THE AXIS OF THE TAP, AND ALL THE CRESTS OF THE SECONDARY THREAD ZONE LYING AT A UNIFORM SECOND RADIUS FROM THE AXIS OF THE TAP; ALL THE THREAD ZONES HAVING TURNS WHICH, CONSIDERED IN PLANES CONTAINING THE AXIS, ARE OF THE SAME PROFILE; THE FIRST RADIUS BEING LESS THAN THE SECOND RADIUS BY AN AMOUNT NOT EXCEEDING HALF THE RADIAL DEPTH OF THE CRESTS ON SECOND THREAD ZONE; THE TRANSITION THREAD ZONE CONSISTING OF ABOUT ONE SPIRAL TURN WHICH LINKS THE ADJACENT TURNS OF THE PRIMARY AND SECONDARY THREAD ZONES; AND THE PROFILE OF THE TURNS HAVING AN APEX AT ITS RADIALLY OUTERMOST EXTREMITY, WHEREBY THE PART OF THE PRIMARY THREAD ZONE ADJACENT TO THE LEADING END WILL EXERT A FIRST THREAD FORGING ACTION UPON INSERTION INTO A BORE AND THEREBY FORM A PRIMARY THREAD, THE REMAINDER OF THE PRIMARY THREAD ZONE WILL MAINTAIN THE TAP IN AXIAL ALIGNMENT IN THE BORE, AND THE TRANSITION THREAD ZONE WILL EXERT A SECOND THREAD FORGING ACTION UPON THE PRIMARY THREAD AND THEREBY ENLARGE THE PRIMARY THREAD INTO SECONDARY THREAD, AND THE REMAINDER OF THE SECONDARY THREAD ZONE WILL SMOOTH THE SECONDARY THREAD.