: If you have an M12 thread and require a standard external undercut, you point a leader line to the groove and label it: "Thread undercut DIN 76 – A" .
No. is the full standard. DIN 76‑A refers specifically to the Form A undercut within that standard. When people search for “DIN 76‑A PDF”, what they almost always need is the PDF of DIN 76‑1 , which contains the dimensions and specifications for Form A.
When using high-strength fasteners, a properly designed run-out prevents the fastener from breaking due to stress concentrations at the head. Summary Checklist for DIN 76-A Specification Standard Number DIN 76-1 (Covers Forms A, B, C, D) Form A (External Thread Run-out) Application Metric Threads (DIN 13-1 / ISO 261) Designation Thread run-out DIN 76 - A Primary Dimensions g1maxg sub 1 m a x end-sub din 76-a pdf
The exact dimensions of a DIN 76-A undercut depend entirely on the nominal diameter ( ) and the of the metric thread.
This public link is valid for 7 days and shares a thread, including any personal information you added. This link or copies made by others cannot be deleted. If you share with third parties, their policies apply. Can’t copy the link right now. Try again later. : If you have an M12 thread and
When designing a part in CAD software (like SolidWorks, Fusion 360, or Inventor), applying a DIN 76-A thread relief is crucial.
For production drawings, always specify: "Thread run-out according to DIN 76-1" or "Undercut to DIN 76-1 Form B" . DIN 76‑A refers specifically to the Form A
When you open a , you will typically see a technical drawing accompanied by a dense data table. The dimensions are directly dependent on the Thread Pitch ( ) of the fastener, not the nominal diameter.
is the German standard that specifies the dimensions for thread run-outs and thread undercuts specifically for ISO metric threads (coarse and fine pitch).
These dimensions (in mm) are standard for common bolt sizes using Form A: Thread Size ( ) Pitch ( ) Undercut Diameter ( ) Length ( ) Radius ( ) M10 M12 M16 4. Where to Find the Official PDF