. In the modern era, most national German standards (DIN) have been replaced by international equivalents to streamline global trade. Intertek Inform Today, most engineers look to the ISO 286 series
: It remains one of the clearest examples for students learning the fundamentals of the ISO system of limits and fits. Internal Documentation
Look down the left column for the range containing 30mm. You will see a row defined as Over 18 to 30 or Over 30 to 50 . (Note: Per standard rules, 30mm falls into the 18 to 30mm step). Locate the Column: Find the column labeled H7 . Read the Deviations: The table will list two values: Upper limit: +21 Lower limit: 0 Calculate Limits: Maximum allowable hole size: Minimum allowable hole size: Where to Find and Download a DIN 7161 PDF legally
The number following the letter (e.g., the '7' in H7) designates the . The lower the number, the tighter the manufacturing tolerance. din 7161 pdf
If you are looking for a , you are likely dealing with legacy technical drawings, mechanical engineering education, or the maintenance of classic machinery.
. Instead of measuring every part with a digital caliper, manufacturers use "Go/No-Go" gauges: Must fit into or over the part. No-Go Gauge:
Find the row that contains your target size (e.g., for a shaft, look at the Internal Documentation Look down the left column for
: Find the row corresponding to your part's basic diameter (e.g., over 10mm up to 18mm).
For modern projects, always verify if the drawing specifies a legacy standard or a newer, updated ISO equivalent.
DIN 7161 defines the standard tolerances and limits for linear dimensions of mating parts. It aligns closely with the international ISO 286 system. The standard establishes a unified system of holes and shafts. This allows engineers to specify exact allowances for manufacturing. Key Purposes Locate the Column: Find the column labeled H7
: Read the values, which are usually in micrometres (+18 / 0). Add or subtract these from your nominal size to find your maximum and minimum manufacturing limits. Tell me if you need:
The official publisher of DIN standards. They hold historical archives. ISO Store: For purchasing the modern ISO 286 equivalents. Academic and Corporate Libraries
DIN 7161 is a German standard (DIN) that specifies the requirements for the geometrical and dimensional tolerancing of technical parts. The standard is titled "Form- und Lagetoleranzen" which translates to "Form and positional tolerances".