I don't think you need to worry about burst pressure too much here. The reason for the 4:1 ratio is to accommodate an occasional spike in pressure and give you lots of safety cushion, so to speak.
If you use SAE 100R2AT as I mentioned before, the 1/2" size is rated for working pressure up to 3,500 PSI. The minimum burst pressure is four times that, or 14,000 PSI. I seriously doubt your system is going to see pressure spikes that high.
Smaller sizes, like 1/4" and 3/8" are rated even higher.
Because SAE 100R2AT is very common, it is also extremely economical. We sell 1/2" ID for only $1.64 per foot ( $1.56 when you order online at www.DiscountHydraulicHose.com ). Fittings and assembly are slightly more.
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Today's Featured Article - Field Modifications (Sins of the Farmer) - by Staff. Picture a new Chevrolet driving down the street without it's grill, right fender and trunk lid. Imagine a crude hole made in the hood to accommodate a new taller air cleaner, the fender wells cut away to make way for larger tires, and half of a sliding glass door used to replace the windshield. Top that off with an old set of '36 Ford headlight shells bolted to the hood. Pretty unlikely for a car... but for a tractor, this is pretty normal. It seems that more often than not they a
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