| Grade | Application | Typical Use | |-------|-------------|--------------| | | Wide tolerance, loose fit | Cast holes, rough clearances, non-critical parts |
If your shaft needs to spin slowly, slide through dusty environments, or serve as a sacrificial wear part, call out 6h11 . Your machinist will thank you, your assembler will succeed, and your cost accountant will smile. 6h11 tolerance
To decode 6h11, you must understand the ISO 286 system (formerly DIN 7160/7161). The code is broken into three parts: , the tolerance class (h) , and the tolerance grade (11) . | Grade | Application | Typical Use |
ISO 286-1:2010(en), Geometrical product specifications (GPS) The code is broken into three parts: ,
for a shaft (lowercase letters represent external features). The "h" designation indicates that the upper limit of the part's size is exactly the nominal dimension (the zero line), meaning the tolerance zone is entirely on the "minus" side. International Tolerance (IT) grade
Always verify with the latest ISO 286-2 standard tables (current revision as of 2024) before finalizing a production drawing, as numerical deviations are legally binding for QA inspections.