Tabella Gola Uni Iso 4755 Work May 2026
Informative Report: UNI ISO 4755 – Thread Run-Outs and Undercuts (Tabella Gola)
1. Scope of the Standard
UNI ISO 4755 (identical to ISO 4755) specifies the dimensions of thread run-outs and thread undercuts for ISO metric threads (according to ISO 261 – general purpose metric threads).
- Undercut diameter (d₁) is always smaller than the thread minor diameter to guarantee clearance.
- Undercut width (a) is measured axially from the last full thread to the start of the shank.
- The radius (r) is recommended for fatigue-resistant designs but is not always mandatory.
Le dimensioni della gola sono strettamente legate al passo della filettatura (P). Di seguito i valori standard espressi in millimetri per le filettature metriche più comuni: Passo filettatura (P) Diametro gola ( Larghezza gola ( Larghezza gola ( 0,5 0,7 0,8 1,0 1,25 1,5 1,75 2,0 2,5 3,0 : Diametro nominale della filettatura. : Diametro del fondo della gola. tabella gola uni iso 4755
The "story" this standard tells is one of universal language. It dictates exactly how to carve a small groove at the end of an external metric thread so that: Informative Report: UNI ISO 4755 – Thread Run-Outs
Stress Management: Properly designed undercuts can reduce stress concentrations at the transition point of a fastener. Key Dimensions in the UNI ISO 4755 Table Undercut diameter (d₁) is always smaller than the
