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When reviewing a DIN 76-A chart, you will encounter several critical dimensions: Thread Pitch (
(often designated as DIN 76-1 Form A) is a German technical standard for thread undercuts on external metric threads . Form A is the "normal" or standard length version used on shafts to allow a mating part to be screwed flush against a shoulder. Key Specifications for DIN 76 Form A Application : Used for external threads (bolts/shafts).
) of the metric thread. The standard defines specific values for the undercut diameter ( ), the undercut width ( ), and the transition radius ( 1. Undercut Diameter ( din 76-a pdf
The standard is split into parts, and the variable "$a$" is a critical dimension within them.
Note: DIN 76-B exists for similar purposes but is often applied to different thread types or tool constraints, whereas DIN 76-A is the go-to for standard metric threads. When reviewing a DIN 76-A chart, you will
Most modern mechanical engineering handbooks and CAD libraries (such as SolidWorks, Autodesk Inventor, or Siemens NX) have the DIN 76-A dimensions natively integrated into their hole wizard and shaft generator tools.
Therefore, specifically refers to the standard geometric profile and dimensions of a thread undercut on a male threaded component (like a bolt or custom machined shaft) where the thread meets a solid shoulder. Why is a Thread Undercut Necessary? ) of the metric thread
Authorized copies can be purchased and downloaded in PDF format directly from the Beuth Verlag website (the official publisher of DIN standards) or through the ISO store.
