Choose a punch and die combination that yields the desired inner bend radius (

Adhering to the DIN 6935 standard ensures that manufactured parts do not fail during the bending process and that CAD/CAM models perfectly match real-world fabrications. By standardizing the minimum bending radius and k-factors, companies drastically reduce material waste caused by trial-and-error bending. Go to product viewer dialog for this item.

According to DIN 6935, the K-factor is not static; it changes depending on the ratio of the inner bend radius to the material thickness ( Small Radius (

For engineers, fabricators, and designers working with sheet metal, calculating the precise flat pattern length before bending is critical to avoid waste and ensure accuracy. The provides the essential formulas, correction factors, and bending radius guidelines for cold bending flat rolled steel . This article serves as a comprehensive guide to understanding and applying the DIN 6935 standard, often sought in PDF format for technical reference. What is the DIN 6935 Standard?

The standard provides a direct formula for calculating the length of the neutral axis in the bend zone:

Note: For a pure 90° bend, many CAD programs convert this into a Bend Deduction value.

: During bending, the material thickness in the rounded portion can reduce by up to Rolling Direction

= Internal or external leg lengths (depending on the dimensioning method)

Using the DIN 6935 standard provides several benefits for manufacturers, designers, and users of spring washers, including:

Mastering Cold Bending: A Deep Dive into the DIN 6935 Standard

The official PDF can be obtained through several authorized channels:

Where:

If you have the DIN 6935 knowledge but not yet the PDF, you can still configure your CAD software:

Understanding DIN 6935: The Standard for Bending Factor Calculations in Sheet Metal

The correction factor accounts for the relocation of the neutral axis during the bending process. DIN 6935 defines this value based on the material thickness ( ), the inner bend radius ( ), and the bending angle ( The formula for the correction factor

: Acknowledges that material thickness can decrease by approximately 20% in the rounded portion of the bend.

For those looking for a copy of the DIN 6935 standard, it is available for download in PDF format from various sources, including the DIN website and other online platforms. The standard PDF provides detailed information on the design, manufacturing, and testing requirements for spring washers.

Here is a guide to legally obtaining your copy: