Din 76-a Pdf ((hot)) Jun 2026

| Standard | Title | Application | |----------|-------|-------------| | | Thread run‑outs and thread undercuts – Part 1: For ISO metric threads in accordance with DIN 13‑1 | External and internal ISO metric threads (coarse and fine pitch) | | DIN 76‑2 | Thread run‑outs and thread undercuts for pipe threads conforming to ISO 228 part 1 | Parallel pipe threads | | DIN 76‑3 | Thread run‑outs, undercuts for trapezoidal threads, buttress threads and knuckle threads and other threads of coarse pitch | Trapezoidal, buttress, knuckle, and other coarse‑pitch threads |

) of the metric thread, rather than just the major diameter ( Key Geometric Parameters

: Form A is the most common ("normal") length. It provides enough space for the thread to end cleanly without significantly weakening the bolt's neck, making it the reliable "middle ground" for general engineering.

| Thread size (M) | Pitch P (mm) | Undercut width a (mm) | Undercut depth t (mm) | |----------------|--------------|------------------------|------------------------| | M3 | 0.5 | 0.8 | 0.15 | | M4 | 0.7 | 1.0 | 0.20 | | M5 | 0.8 | 1.2 | 0.25 | | M6 | 1.0 | 1.5 | 0.30 | | M8 | 1.25 | 1.8 | 0.35 | | M10 | 1.5 | 2.0 | 0.40 | | M12 | 1.75 | 2.5 | 0.50 | | M16 | 2.0 | 3.0 | 0.60 | din 76-a pdf

The controlled radius minimizes the risk of the bolt shearing off under high torque or structural loads.

While Form A is standard, engineers often compare it to Form B for compact designs. Form A (Normal) Form B (Short) Default for most standard parts. Used when space is limited. Undercut Width Manufacturing Standard tooling. May require special tooling. Accessing the Standard

According to typical DIN 76-1 specifications, the length of the undercut is generally associated with the pitch (P) of the thread, often designed to be roughly 3 × P to ensure complete thread engagement in specialized applications. Difference Between DIN 76-A and DIN 76-B While Form A is standard, engineers often compare

In mechanical engineering and manufacturing, precision is everything. When designing threaded fasteners or tapped holes, components must fit together perfectly without interference. One critical standard that ensures this smooth assembly is .

The DIN 76-A PDF document is essential for various stakeholders, including:

The primary role of a is to provide a "relief zone" for the threading tool. Undercut Width Manufacturing Standard tooling

When downloading a reference PDF, always verify that the tables are updated to reflect the latest revision of .

For official documentation, you can purchase the full standard from DIN Media or Accuris Standards Store . Din 76-1 | PDF | Screw | Metalworking - Scribd

The authoritative source is (formerly Beuth Verlag), the official distributor of DIN standards. You can purchase the current DIN 76‑1:2016‑08 as a PDF in German or English.

specifically defines the geometry of a groove machined into a bolt or shaft right where the thread meets the unthreaded shoulder. Why is a Thread Undercut Necessary?

is the German standard that specifies the dimensions for thread run-outs and thread undercuts specifically for ISO metric threads (coarse and fine pitch).