ISO 286 is the international standard for the , providing a universal language for engineers to specify the exact fits between mating parts (like a shaft and a hole). By using this system, manufacturers ensure that components made by different suppliers will fit together perfectly. The standard is divided into two primary parts:
. It provides a standardized language for engineers to ensure that parts manufactured anywhere in the world will fit together correctly without requiring manual adjustment. Xometry Pro Core Structure of ISO 286 iso 286 pdf
The ISO 286 standard can be accessed in PDF format through various sources, including: ISO code system for tolerances on linear sizes
– Establishes the code system, basic terminology (e.g., "basic hole" and "basic shaft"), and the principles for defining fits. Shafts (a to z): 'h' represents zero deviation
: The shaft is always larger than the hole. These parts must be forced together and are meant to stay fixed. Practical Example: The H7/h6 Fit