To select hydraulic fittings for high-temperature applications, match four things to your real operating conditions: the fitting body material, the plating or surface finish, the sealing method (including any O-ring or seal compound), and the pressure rating after temperature derating. In practice, that usually means steel or stainless steel bodies, metal-to-metal or high-temperature elastomer seals such as FKM, and a safety margin above your peak fluid and ambient temperature. Heat is one of the quietest causes of hydraulic failure. A fitting that performs perfectly at 60°C can weep, harden, or crack at 120°C. Because temperature affects metals, seals, and the fluid itself, choosing the right fitting means looking at the whole connection, not just the thread size. This guide walks through the selection process step by step.
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