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That type of hose is standard in the machine building industry, simply push it on (without oil as a lubricant) and it is definately good to 150 psi. And they are very good.
I think the ratings posted refer to the fitting rated pressure, and the hose rated pressure, not the assembly with the hose on the fitting. To got o 350 psi I would use a proper clamp, but at 'normal' pressures no clamps are used or required.
What exactly are you using them for?
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84 Cab - sold!
89 Cab - not quite done
90C4 - winter beater
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