Heavy Duty Metal Hoses are made of stainless steel and the difference between Standard Metal Hoses and Heavy Duty Metal Hoses is bigger bellows wall thickness (more material = worst flexibility= higher working pressure) which from one side giving you worst flexibility but working pressure is increasing the same time.
Heavy Duty Metal Hoses are usualy used for applications which are working in hard conditions especialy where working pressure is far higher then normal metal hose can stand, you need to remember that Heavy Duty Metal Hoses version is more expensive then standard and sometimes no reason to use special hose version and it is enough if we use standard metal hose with special welding instead expensive Heavy Duty Metal Hoses.
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