Prepared for: Engineering & Quality Assurance
Date: [Current Date]
Version: 1.0
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| Term | Description | |------|-------------| | Thread run-out | Transition zone where the thread depth decreases to zero over a defined length. | | Thread undercut (relief groove) | A groove machined at the end of the threaded portion, allowing the thread to run out fully into a cylindrical or reduced-diameter relief. | | Full thread length | Portion of thread with complete profile (minor diameter). | Prepared for: Engineering & Quality Assurance Date: [Current
On a typical engineering drawing, you might see a note like: "Thread: M12 – 6H – DIN 13
"Thread: M12 – 6H – DIN 13. Undercut per DIN 76-A – Form F"
Here is how to interpret that:
If the drawing shows a shaft with a thread ending at a shoulder, the machinist must look up the P (pitch) in the DIN 76-A PDF and machine the undercut to the specified width and depth.