Pneumatic Clean Series

Fittings & Tube/Common Precautions 2Be sure to read before handling. Refer to pages 7 to 16 of Front matter for safety instructionsand common precautions for clean series. Refer to the main text for precautions for each series.532CautionFittings with SealantqTighten the fitting with an appropriate torque in thetable below. For standard installation, add 2 to 3turns using a tool after fastening by hand.Connection thread size Appropriate tightening torque NmNPT 1/16, NPT, R1/8 7 to 9NPT, R1/4 12 to 14NPT, R3/8 22 to 24NPT, R1/2 28 to 30Precautions on Use of Other BrandsCautionqWhen using tubing brands other than SMC, confirmthat the outside diameter tolerances of the tubingsatisfy the following specifications.1)Nylon tubing Within ±0.1mm2)Soft nylon tubing Within ±0.1mm3)Polyurethane tubing Within +0.15mm,Within –0.2mmDo not use tubing if the outside diameter tolerance is notsatisfied. It may not be possible to connect the tubing, orleakage or disconnection may occur after connection.wIf the fitting is screwed in with excessive torque, alarge amount of sealant will seep out. Remove theexcess sealant.eInsufficient tightening may cause faulty sealing orloosening.rReuse1) In most cases, two or three uses are possible.2) Remove the sealant sticking to the fittings by blowing air overthe threaded portion to prevent the sealant from entering theequipment, which may result in air leakage.3) If the sealant no longer provides an effective seal, wrapsealing tape over sealant before reuse.tOnce the fitting has been tightened backing it out toits original position often causes the sealant tobecome defective, resulting in air leakage.Air Line Equipment513