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They're not going to hold up if you're pushing beyond 3000 PSI consistently—that's the honest truth, and anyone telling you otherwise is probably overselling it, but for standard hydraulic loop pressures in the 1500 to 2500 range, they work just fine and we've seen them last years in those conditions.
Basically, the copper gives you a corrosion edge over steel in wet environments, and teh smooth interior surface means you won't be chewing up hose ends during installation, which is a common headache we hear about from the field guys.
3, we offer sizes from DN6 up to DN50, but the 10mm and 12mm sizes are what most buyers go with for general hydraulic work, and the surface finish is polished enough that you don't get that rough grab that can damage the hose jacket.
Temperature-wise, you're good from -20°C to about 120°C, so for most shop floors and mobile equipment that's plenty, but if you're running near a furnace or in Arctic cold, you'll want to check spec sheet—we usually have stock for standard sizes, but confirm lead time if you're ordering more than 100 pieces or so.
For custom sizes, the lead time jumps to 15-30 days, and the minimum order quantity is 100 pieces per size—we pack them in plastic bags inside cartons, (usually 2-4 weeks for custom) so they don't get scratched in shiping, which matters because a burr on the ferrule can cause leaks.
Also, these aren't suited for high-vibration applictions like heavy earthmoving equipment—you'd want a steel ferrule with a locking feature for that, but for stationary pumps, industrial presses, and general assembly work, the copper holds tight and the DIN, ANSI, and JIS compliance means you won't have compatibility surprises.
