Din 76-a Pdf May 2026

Technical Report: DIN 76-1 – Thread Run-Outs and Undercuts for Metric ISO Threads

Blend Angles:

Standard DIN undercuts typically use blend angles of 30 or 60 degrees . Add a thread undercut - PTC Support Portal

Thread Undercut DIN 76–A

Typically, you do not need to draw the exact geometry if you call out the standard. Use a note such as: 📥 How to Find a DIN 76-A PDF din 76-a pdf

Notch Effect Mitigation:

Precise rounding in the undercut helps distribute stress and prevents the fastener from snapping under load. Standard Classifications (Forms A, B, C, D) Technical Report: DIN 76-1 – Thread Run-Outs and

A Type A undercut is deeper and wider than Type B. While Type A provides better clearance for the mating part, it reduces the cross-sectional area of the bolt more than Type B. In high-stress applications, verify that the reduced diameter ( ) can handle the tensile load. 2. Manufacturing Methods Standard Classifications (Forms A, B, C, D) A

DIN 76-A PDF

Once you have your , here is how a CNC machinist or lathe operator applies it: