: Si raccomanda l'uso della gola ISO 4755 solo quando strettamente necessario; in caso contrario, si preferisce la filettatura incompleta (spallamento) per non indebolire la sezione resistente del bullone. iTeh Standards Hai bisogno delle quote specifiche per un diametro nominale (M) particolare o preferisci approfondire la quotatura a disegno ISO-4755-1983.pdf - iTeh Standards
) for external metric fasteners, ensuring proper clearance. These undercuts are utilized to allow full thread engagement up to a shoulder, typically applying a 30° transition angle and h12/h13 tolerances. View the technical document on MEC360 . ISO-4755-1983.pdf - iTeh Standards tabella gola uni iso 4755
The dimensions of the undercut depend primarily on the thread pitch ( : Si raccomanda l'uso della gola ISO 4755
The UNI ISO 4755 standard specifies the form and dimensions for thread undercuts on fasteners with external metric ISO threads. It provides a standardized "relief groove" at the end of a threaded section, allowing a cutting tool to exit cleanly and ensuring a flat seat for the mating component. Why are Undercuts Necessary? View the technical document on MEC360
: Senza la gola, la "fuga" del filetto impedisce al dado o alla flangia di toccare la spalla del bullone. Riduzione delle tensioni
They provide space for the thread-cutting tool to finish its pass without crashing into a shoulder.