Specifically, defines the standard dimensions for an undercut on an external thread (such as a bolt or stud). By removing the incomplete threads and creating a clean groove, the mating internal thread (or nut) can screw completely down to the shoulder without interference. Why Use a DIN 76 Form A Undercut?
The DIN 76A PDF document is essential for various industries, including: din 76a pdf
Machinists use go/no-go gauges or optical comparators to ensure the The DIN 76A PDF document is essential for
DIN 76A is a German standard for a specific type of threading, known as a "Metric Thread with a 60-degree angle and a flat crest." The standard is published by the Deutsches Institut für Normung (DIN), a German national standards body. DIN 76A defines the dimensions, tolerances, and testing methods for metric threads with a 60-degree angle and a flat crest. ISO 4755:1983 specifies a single type with g₂
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.
Official, full-text copies of the are protected by copyright and can be purchased legally through authorized distributors like the DIN Media (formerly Beuth Verlag) website or the ISO Store . Many engineering universities and corporate networks also provide free intranet access to these standards libraries for students and employees.
The fastener can be tightened completely against the part.