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This indicates a type A undercut (normal design) for an M10 thread. If a thread run‑out (rather than an undercut) is sufficient, the drawing may simply specify a run‑out length without calling out DIN 76‑1 explicitly. However, for internal threads in blind holes, many designers still reference DIN 76‑1 to define the bottom run‑out or undercut. din 76a pdf
Adhering to the DIN 76 standard ensures global compatibility across European and international manufacturing chains. Key Dimensions of DIN 76 Form A
(Transition Width): The width including the chamfer/radius leading back to the nominal thread diameter. Adhering to the DIN 76 standard ensures global
The DIN 76 series of standards (specifically DIN 76-1 and DIN 76-2) defines the dimensions for thread run-outs and thread undercuts for fasteners
DIN 76‑1 is a German industrial standard titled “Fasteners – Thread run‑outs and thread undercuts – Part 1: For ISO metric threads in accordance with DIN 13‑1.” It specifies the dimensions and designations for thread run‑outs and thread undercuts on both external threads (e.g., bolts and screws) and internal threads (e.g., blind tapped holes). The standard applies to ISO metric coarse and fine pitch threads as defined in DIN 13‑1 and DIN ISO 261. The standard applies to ISO metric coarse and
This distinction does not exist in the source international standards. ISO 4755:1983 specifies a single type with g₂ max = 3 P , which German experts found insufficient for reliable production with conventional tools. Consequently, DIN 76‑1 adopted the more practical 3.5 P for normal use while retaining a short version for special cases.
You can point a leader line to the thread shoulder and note:
| Part | Applies to | | --- | --- | | DIN 76-2 | Pipe threads conforming to ISO 228-1 | | DIN 76-3 | Trapezoidal threads, buttress threads, knuckle threads, and other coarse pitch threads |
In the world of precision engineering and mechanical design, details matter. One such detail that often dictates the longevity and reliability of a fastened joint is the (also known as a thread undercut). If you are looking for information on DIN 76-1 (often referred to simply as DIN 76), you are likely dealing with the technicalities of how a screw thread ends. What is DIN 76-1?