Answered: Tightening Pneumatic Solenoid Fittings

The SMC KJS 04-M3 air-hose fittings get screwed into the Solenoids.

Tightening them finger-tight didn’t stop leaks.

SMC product literature recommended using an allen wrench to tighten them 1/4 turn past finger-tight.

Is this how IFI expects users to tighten those fittings (in order to seal leaks)? Or is there another method I should use to seal the joints between the fittings and the solenoids?

Thanks in advance,

Yes, follow SMC recommendations. Note: it is possible to over-tighten and shear the threads off into the Cylinder.