~repack~ | Tabella Gola Uni Iso 4755

Technical Write-Up: UNI ISO 4755 – Undercut (Gola) Tables for Metric Threads

When to use the table:

1. "The gola is a defect."

Or dimensioned explicitly:

“GOLA M6 – a max 2.0”

a machined groove located at the end of the threaded portion of a bolt or screw, where it meets a shoulder or collar ISO - International Organization for Standardization Key Features of the ISO 4755 Undercut tabella gola uni iso 4755

UNI ISO 4755

The standard (equivalent to the international ISO 4755:1983 ) specifies the form and dimensions of thread undercuts (known in Italian as gola di scarico ) for fasteners with external ISO metric threads. These features are typically used at the end of a threaded shaft to provide clearance for a cutting tool or to allow a mating component, like a plug, to sit flush against a shoulder. Key Technical Specifications Technical Write-Up: UNI ISO 4755 – Undercut (Gola)

• 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.