Din 76-a Pdf !full!

(radius) and 30-degree angles specified by DIN 76-A. Using the wrong insert radius can cause a structural weak point on the bolt or shaft.

| Thread pitch ( P ) (mm) | Undercut length ( g_2 ) (approx.) | Undercut diameter | Transition radius ( R ) | Relief angle | |--------------------------|--------------------------------------|--------------------|--------------------------|--------------| | 0,2 | 0,7 mm | 0,3 mm | 0,1 | 30° | | 0,25 | 0,9 mm | 0,4 mm | 0,12 | 30° | | 0,3 | 1,05 mm | 0,5 mm | 0,16 | 30° | | 0,35 | 1,2 mm | 0,6 mm | 0,16 | 30° | | 0,4 | 1,4 mm | 0,7 mm | 0,2 | 30° | | 0,5 | 1,75 mm | 0,8 mm | 0,2 | 30° | | 0,6 | 2,1 mm | 1,0 mm | 0,4 | 30° | | 0,7 | 2,45 mm | 1,1 mm | 0,4 | 30° | | 0,75 | 2,6 mm | 1,2 mm | 0,4 | 30° | | 0,8 | 2,8 mm | 1,3 mm | 0,4 | 30° | | 1,0 | 3,5 mm | 1,6 mm | 0,6 | 30° | | 1,25 | 4,4 mm | 2,0 mm | 0,6 | 30° | | 1,5 | 5,2 mm | 2,3 mm | 0,8 | 30° | | 1,75 | 6,1 mm | 2,6 mm | 1,0 | 30° | | 2,0 | 7,0 mm | 3,0 mm | 1,0 | 30° | | 2,5 | 8,7 mm | 3,6 mm | 1,2 | 30° | | 3,0 | 10,5 mm | 4,4 mm | 1,6 | 30° | | 3,5 | 12,0 mm | 5,0 mm | 1,6 | 30° | | 4,0 | 14,0 mm | 5,7 mm | 2,0 | 30° | | 5,0 | 17,5 mm | 7,0 mm | 2,5 | 30° | | 6,0 | 21,0 mm | 8,3 mm | 3,2 | 30° |

When threads are machined, the cutting tool or rolling die cannot instantly stop at a sharp shoulder. This creates a "run-out" zone of incomplete, unusable threads. A DIN 76-A undercut removes this zone entirely, allowing the mating part to screw tightly against the shoulder. 2. Reduces Stress Concentrations

The primary role of a is to provide a "relief zone" for the threading tool.

Do you need help for a custom machined part? din 76-a pdf

: Maximum width of the undercut including the transition angle.

To ensure you are using the correct and legally binding document, please refer to the official sources below.

When a thread is cut, the tool cannot stop instantly at a shoulder or the bottom of a hole. This results in "run-out," where the thread is not fully formed. addresses this by standardizing:

Standard undercut for internal threads (female/tapped holes). Form D: Short undercut for internal threads. (radius) and 30-degree angles specified by DIN 76-A

If you are searching for a or trying to understand how to apply this standard to your technical drawings, this comprehensive guide breaks down the specifications, dimensions, and engineering purpose of Form A thread undercuts. What is DIN 76-1 Form A?

For example, if you are working with an M12 thread, you would reference the dimensions for the corresponding pitch (in this case, standard pitch is 1.75mm) within the DIN 76-A tables.

Are you trying to decide between and Type B (short) for a tight assembly?

When engineers refer to "DIN 76-A," they are specifically looking for the geometry required to machine a relief groove at the end of an external thread. The Purpose of a Thread Undercut This creates a "run-out" zone of incomplete, unusable

: The full document provides calculations for fine pitches, multi-start threads, and transitional geometries not found in basic online summaries.

Here are some of the most common questions surrounding DIN 76-1.

Official copies of the DIN 76-1:2016-08 are available through the or authorized distributors like ANSI . For quick technical reference, engineers often use summarized tables found in resources like the Tabellenbuch Metall . AI responses may include mistakes. Learn more Share public link

If you need help calculating for an uncommon thread pitch, or if you want to know how to set up DIN 76-A features automatically in your CAD software , let me know how you would like to proceed! Share public link