Tabella Gola Uni Iso: 4755

Note: All values are in millimeters (mm).

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"). tabella gola uni iso 4755

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." Note: All values are in millimeters (mm)

| 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. | What is UNI ISO 4755