5 X 10 HD BOTH ENDS

In this case, “HD both ends” is calling out a heavy-duty configuration on each end of the component, meant for tougher hydraulic service where standard-duty ends may not hold up as well.

Heavy-duty terminations on both ends means neither connection point is the weak link when things get rough. Standard-duty fittings can hold up fine in lighter-load systems, but when you're running demanding hydraulic conditions consistently, having matched heavy-duty construction across both ends keeps the whole assembly rated for that kind of service. The 5 x 10 sizing paired with that HD configuration on each side is the point of this part, so it fits systems where one standard end and one heavy end just won't cut it.

Functionally, the "HD Both Ends" tag signals that this component is built tougher for hydraulic systems facing more stress and wear than usual. It's intended for those applications where standard parts might not hold up over time.