Tabella Gola Uni Iso 4755 2021

Many engineers search for ISO 4755 expecting a table of dimensions. However, is a "design rules" standard, not a dimension table itself. It dictates how the groove should be designed to ensure the screw functions correctly.

) 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

Intuitively, removing material seems weakening. However, by eliminating a sharp corner, the groove increases fatigue resistance. A bolt with an ISO 4755 undercut will last longer under dynamic loads (vibration, rotating bending) than a bolt with a sharp 90-degree transition. Many engineers search for ISO 4755 expecting a

: Used where a full thread up to a shoulder is not possible or necessary. It ensures the mating part can be tightened without interference from the thread run-out. ) for external metric fasteners, ensuring proper clearance

: It provides clearance for the assembly of mating parts (like a nut or a flange) to sit flush against the fastener's shoulder, as threads cannot be cut perfectly to the very edge of a solid wall. : The undercut dimensions are determined by the thread pitch ( Diameter ( : Typically at least smaller than the thread's minor diameter. : Generally recommended to be between for normal applications. Transition : It often includes a radius or chamfer (e.g., 45 raised to the composed with power

UNI ISO 4755 is the general recommendation, but specific product standards (like those for specialized plugs) may take precedence.