Visual charts illustrate the relationship between the clearance, transition, and interference fits. Clear line work is required to distinguish between maximum and minimum material conditions. 3. Clear Text Layouts
It is vital for contemporary engineers to note that . The modern, globally recognized equivalent is the DIN EN ISO 286 series:
The tolerance zones are designed so that the hole is always larger than the shaft. This allows for free rotation or sliding movement.
: For modern equivalent standards (ISO 286).
Put simply: When a designer forgets to put a tolerance on a hole or a shaft, DIN 7161 tells the machinist what is acceptable. din 7161 pdf extra quality
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The shaft is always larger than the hole. The parts must be forced together using a press or thermal expansion/contraction, creating a rigid, permanent bond (e.g., H7/p6 ).
DIN 7161 defines how components interact based on their allowance. Every engineering fit falls into one of three categories. 1. Clearance Fit
Ensure your chosen fit accounts for thermal expansion. Components that exhibit a perfect clearance fit at a room temperature of 20°C may seize up or become interference fits under high operating temperatures if they are made of dissimilar metals. Clear Text Layouts It is vital for contemporary
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A letter indicating the position of the tolerance zone relative to the nominal size (uppercase for holes, lowercase for shafts). Deciphering the DIN 7161 System: Shafts vs. Holes
What are the specific (e.g., H7, f7)?
Tolerance values are typically listed in micrometers (
Whenever possible, use the standard hole-basis system (where the hole is kept at a constant base deviation, like 'H', and the shaft dimension is varied). Machining and inspecting standard holes using fixed reamers and plug gauges is significantly more cost-effective than customizing hole sizes.
Covers nominal diameters from 1 mm up to 500 mm.
: References measurements taken at the international standard of 20°C (68°F). : For modern equivalent standards (ISO 286)