What this calculator does
The calculator supports hole selection for general-purpose bolted assemblies. Medium is often a useful starting point; fine reduces assembly play while coarse gives more positional allowance.
Bolts · hole dimensions
ISO 273 bolt clearance hole
Look up the tabulated fine, medium, or coarse clearance-hole diameter for a metric thread.
ISO273
02
Results
ƒ(x)
Set the inputs and run the calculation.
What still needs checking
Special applications require a design-specific hole selection. Also check bearing area, edge distance, assembly clearance, coatings, and possible interference with the under-head fillet.