Din 76a Pdf |link| Jun 2026

Type A (normal design) with g₂ max = 3.5 P (where P is the thread pitch).

The standard provides a system of standardized geometries for the transition area at the end of a thread. This area, whether a gradual run-out or a relieved undercut, is critical for both the manufacturing and functional performance of threaded fasteners.

Many commercial CAD libraries (such as LinkAble CAD Lib.) include ISO/EN/DIN/ANSI/JIS standard part models, allowing seamless import of DIN 76‑1 undercut geometries into various 2D and 3D CAD systems. din 76a pdf

flowchart LR subgraph "Standard Thread Undercut Dimensions" direction LR A[External Thread<br>Shoulder] --> B[Undercut Region] end subgraph Dimensions direction TB D1["`g1 / g2** (Undercut Width): 2.5P / 3.5P (std) / 5P`"] D2["`x (Thread Run-Out Length): 3.5P (normal) / 6.5P (long)`"] D3["`r (Undercut Radius): 0.5P`"] end

: Specifies short thread undercuts for external threads (used when space or engagement length is limited). Form C & D : Apply to internal (female) thread undercuts. Type A (normal design) with g₂ max = 3

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DIN 76-1 is the German standard that specifies dimensions for and thread undercuts for ISO metric threads. It ensures that when a bolt is tightened into a tapped hole, it doesn’t bottom out or experience stress concentrations due to the transition between the threaded and unthreaded portion of the shank. Key Forms of DIN 76 Many commercial CAD libraries (such as LinkAble CAD Lib

) of the metric thread. The standard provides dimensions for several critical parameters:

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Without a proper undercut according to DIN 76, a nut might not be able to sit flush against the bearing surface of a bolt. The undercut provides a "clearance" zone where the cutting tool exits the workpiece, ensuring:

Accessing the official DIN 76A PDF is essential for engineers, draughtsmen, and procurement specialists to ensure compliance. Where to Purchase/Download