Tabella Gola Uni Iso: 4755

In the world of mechanical fastening and threaded connections, precision is not just a metric; it is a safety requirement. When dealing with hexagon head bolts and screws, one of the most overlooked yet critical geometric features is the gola (often translated as the "undercut" or "fillet groove").

| Standard | Name | Key Difference | | :--- | :--- | :--- | | | Undercuts for metric threads (long version) | Standard undercut for general engineering. | | DIN 76-1 | Undercuts for metric threads | Almost identical to ISO 4755 (Germany uses DIN 76-1). In practice, they are interchangeable for most sizes. | | DIN 78 | Undercuts for bolts with reduced shank | Different geometry; used specifically for shoulder bolts. | | ISO 3506 | Mechanical properties for stainless steel | Refers back to ISO 4755 for undercut dimensions, but property classes (A2-70, A4-80) have different fatigue limits. | tabella gola uni iso 4755

Note: All values are in millimeters (mm). In the world of mechanical fastening and threaded

For Italian manufacturers and European engineering standards, the reference point for this dimension is found in a single, crucial document: . If you have searched for the "Tabella Gola UNI ISO 4755," you likely need the exact dimensional data for threading undercuts or fillets. This article provides a comprehensive breakdown of that standard, its dimensions, applications, and why it matters for your assembly. What is UNI ISO 4755? (A Quick Overview) Before diving into the table ( tabella ), we must understand the standard itself. UNI ISO 4755 is the Italian adoption of the international standard ISO 4755. The title is: "Fasteners — Bolts, screws and studs with a thread length shorter than nominal length — Undercuts for metric threads according to ISO 261." | | DIN 76-1 | Undercuts for metric