Our polymer-based universal connectors and PEEK union connectors only need to be hand tightened, whereas any of the stainless-steel fittings need to be wrench-tightened. The EXP fittings can be used either way. They are hand-tightened for use up to 8700 psi or wrench tightened for use up to 20,000 psi. Note that overtightening causes galling and will destroy the threads. Fittings that need to be wrench tightened generally require ¼-turn past hand tight to achieve a leak-tight seal. Unfortunately, there is no universal torque setting.
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