If you have an old drawing or tool label saying “DIN 76-A”, it’s probably an informal abbreviation or a misreading of with “A” referring to form A undercut (one of the shapes in the standard).
For those looking for the full technical data, you can find the DIN 76-1 PDF on Scribd or purchase official copies from providers like Standards Supply .
Includes specific dimensions for the undercut diameter ( ), radius ( ), and depth ( ) based on the thread pitch. din 76-a pdf
for external metric threads. Key dimensional characteristics include: Thread Relief Explained: Function, DIN 76 & Practical Use
is the go-to specification for external metric threads when you need a standard-length relief groove. By using this standard, you ensure that the nut can be tightened fully against the shoulder of a component without interference from the thread run-out. Key Facts about DIN 76-A: If you have an old drawing or tool
from:
As of 2025, the move toward (smart PDFs and machine-readable data) is accelerating. The latest DIN 76-1 PDF includes: for external metric threads
DIN 76 specifies different forms of under-cuts depending on whether the thread is external or internal and the required length: Application Description External Threads Normal design (long) used when no specific space constraints exist. External Threads Short design