As seen in the images below, a compression style threaded fitting should be used for coolant hoses:
Other large tubing, such as intake, piping for turbo or intercooler on a diesel, etc., should use a Boost Depot style stainless V-Band clamp.
Fuel lines, oil lines and even coolant lines should use Earl's anodized aluminum fittings or the steel equivalent. These are compression style fittings commonly seen on hydraulic hoses, HVAC lines in vehicles and in marine applications: (Note: If I paid $1M for a boat, there would be no hose clamps.)
https://www.anplumbing.com/ - they have every type of fitting and hose imagineable, so there is no need for hose repair clamps:
And finally, if you are using a "hose clamp" to "mount" something, you are using the incorrect item to begin with. They are hose repair clamps, not mounting clamps. Professional "fabrication" by its very nature, includes proper engineering, mounting, etc., not parts store bodgery.
An example of a billet mounting bracket for something round, such as a fuel filter:
End of lesson, back to your regularly scheduled programming.