: Specifies a standard-depth undercut typically utilized for general mechanical engineering applications where space is not critically limited, and structural integrity must be balanced with ease of manufacturing.

Thread undercuts offer several key functional benefits:

The cost is typically around for a single-user PDF, depending on the version and language. Purchasing the official document ensures you have the correct, legally obtained standard, which is essential for professional and legal compliance.

Yes. The standard applies equally to right‑hand and left‑hand ISO metric threads. The geometry of the run‑out or undercut does not depend on the hand of the thread.

Using unauthorised copies in a professional context risks using outdated or incorrect information and may violate copyright law. For critical applications, always refer to the current official edition (2016‑08) or the latest draft.

, typically used when the distance to the bearing face must be minimized. It requires special tooling due to its narrower width. : The standard design for internal threads (blind tapped holes). : A "short" design for internal threads , used when space at the bottom of a hole is limited. Technical Specifications

Inputting the g₂, e, and d₂ dimensions directly from the standard.

When creating CAD models or drafting in tools like AutoCAD or SolidWorks, the DIN 76A specification is usually implemented by: Using the thread undercut tool.

The overall standard is systematically divided across three distinct parts to address varying threading profiles:

According to the standard, thread reliefs are split into four primary forms: : External threads, normal (long) design. Form B : External threads, short design.

On technical drawings, DIN 76‑1 refers to the standard number, followed by the type of undercut (A or B) and the thread size. For example:

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The DIN 76-A specification ensures that external metric threads interface perfectly with flat mating surfaces without structural or mechanical interference. Accessing a verified DIN 76-A PDF data sheet allows mechanical designers, CAD draftspersons, and CNC machinists to standardize their operations, eliminate assembly errors, and guarantee consistent mechanical performance across international supply chains.

For Form B:

Below are typical values for common metric sizes based on DIN 76-1 Form A: Thread Size ( Undercut Width ( Undercut Diameter ( M4 M5 M6 M8 M10 M12 Where to Find the PDF

DIN 76‑1 is largely based on two ISO standards:

The comprehensive guide below outlines the fundamental engineering principles, the differences in thread forms, and what you need to know when utilizing specifications in your designs. What is a Thread Undercut (Thread Relief)?

): The width of the relief groove is closely tied to the thread pitch. Generally, Form A specifies a wider groove (roughly 3 times the pitch) compared to Form B to reduce stress concentration. Run-out Length (