The shaft is always larger than the hole. Parts must be pressed together. Permanent assemblies, bearing bushings. Structure of a DIN 7161 PDF Data Table
Technical platforms like Scribd host scanned versions of the original 1965 document for informational purposes.
For instance, an hole means the lower deviation is exactly zero. Any part made will be equal to or larger than the nominal size. 3. International Tolerance Grade (IT Grade)
If you are looking for a , it is crucial to understand its current status in global manufacturing.
Complete Guide to DIN 7161: ISO Metric Limits and Fits The DIN 7161 standard is a fundamental reference document in mechanical engineering, manufacturing, and quality control. It establishes the basis for the system of limits and fits for metric sizes, ensuring interchangeability of parts. Understanding this standard is essential for engineers designing shafts, bearings, and housings. What is DIN 7161? din 7161 pdf
Yes, a withdrawn "historical" standard can still be used under specific conditions. According to official guidance from DIN Media, . However, it is generally recommended to use the most current standard (DIN EN ISO 286-2) to ensure compliance with best practices and international technical specifications.
It covers nominal diameters from 1 mm up to 500 mm.
In an interference fit, the shaft is intentionally larger than the hole. Joining the parts requires significant force, thermal expansion/contraction, or a hydraulic press. Once assembled, the friction locks the parts together.
The primary purpose of the original document was to translate the early ISO/R286-1962 recommendation framework into actionable manufacturing tolerances specifically geared toward internal bores and matrices. 1. Holes vs. Shafts Focus The shaft is always larger than the hole
Furthermore, vocational training programs in Germany and Austria still use DIN 7161 to teach the principles of limits and fits before transitioning to modern ISO standards. It is considered a pedagogical stepping stone.
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The measured dimension of a manufactured part. Due to manufacturing variations, the actual size rarely matches the nominal size perfectly. 3. Upper and Lower Deviation
: Mechanically superseded and fully replaced to align with modern European global supply chains. Structure of a DIN 7161 PDF Data Table
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DIN 7161 was never an isolated document. It was part of a larger, interconnected "DIN family" of standards from the 1960s. Understanding these related standards helps to provide context:
: General engineering (fits for shafts and holes). IT12 to IT18 : Coarser manufacturing (casting, stamping). Common Types of Fits in DIN 7161 Description Common Example Clearance Fit